CN109136742A - S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production method - Google Patents
S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production method Download PDFInfo
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- CN109136742A CN109136742A CN201810770037.0A CN201810770037A CN109136742A CN 109136742 A CN109136742 A CN 109136742A CN 201810770037 A CN201810770037 A CN 201810770037A CN 109136742 A CN109136742 A CN 109136742A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- C—CHEMISTRY; METALLURGY
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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Abstract
The invention discloses a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production methods, continuous casting billet chemical component composition and its mass percentage are as follows: C≤0.10%, Si:0.20~0.40%, Mn:1.52~1.62%, P≤0.015%, S≤0.003%, Cr+Mo+Ni+Cu≤0.70%, Al:0.020~0.050%, N≤0.008%, Nb+Ti+V≤0.11%, remaining is Fe and inevitable impurity；Production method includes ingredient, refining, vacuum processing, continuous casting, continuous casting billet cleaning process.Design of Chemical Composition of the present invention uses low charcoal low-alloy content, and production method obtains the nonmetal inclusion four evaluation high-quality continuous casting billets of≤1.5 ranks using being vacuum-treated, maximum section is 330mm × 2400mm, process stabilizing, it is at low cost, it can be achieved that batch localization.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billet and its production
Method.
Background technique
Currently, domestic production S355G8+M-Z35 continuous casting billet technology of smelting is also unstable, mainly continuous casting slab segregation and split
Line quality is more, is limited to the technological operations such as S355G8+M-Z35 continuous casting billet designed capacity, smelting process and pouring temperature, time
Level constrains the stability of S355G8+M-Z35 continuous casting billet inside and surface quality, leads to S355G8+M-Z35 plate quality
Lower than external product.
In order to break the external monopolization in field of metallurgy to S355G8+M-Z35 continuous casting billet smelting technique, my public affairs are given full play to
Continuous casting machine and technology accumulation advantage are taken charge of, a large amount of smelting production S355G8+M-Z35 continuous casting billet research of technique work has been carried out
Make, to solve the process operation levels such as limitation S355G8+M-Z35 continuous casting billet designed capacity, smelting process and pouring temperature, time
Problem.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billets；The present invention also mentions
A kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet is supplied.The invention ingredient, refining, vacuum processing, continuous casting,
It is innovated in continuous casting billet cleaning, improves continuous casting billet internal organizational structure, improves continuous casting billet quality technical indicator, meet
Low cost, high-quality S355G8+M-Z35 super thick ultra-wide steel plate demand are produced using continuous casting billet mode, process stabilizing is, it can be achieved that batch
Localization.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of S355G8+M-Z35 super thick ultra-wide company
Slab, the continuous casting billet chemical component composition and its mass percentage are as follows: C≤0.10%, Si:0.20~0.40%, Mn:1.52
~1.62%, P≤0.015%, S≤0.003%, Cr+Mo+Ni+Cu≤0.70%, Al:0.020~0.050%, N≤0.008%, Nb+
Ti+V≤0.11%, remaining is Fe and inevitable impurity.
Continuous casting billet maximum section of the present invention is 330mm × 2400mm.
≤ 1.5 ranks of continuous casting billet nonmetal inclusion four evaluations of the present invention.
The present invention also provides a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet, the production method packets
Include ingredient, refining, vacuum processing, continuous casting, continuous casting billet cleaning process.
Vacuum processing process of the present invention, seat packet 0.40~0.80kg/t of Ca Si wire feeding steel, 2.0~6.0kg/t of Al line
It is vacuumized after steel, vacuum degree≤66Pa, the vacuum retention time >=15min.
Burden process of the present invention, forbids being incorporated steel scrap ingot mould, slag steel, packet bottom in furnace charge, adding amount of scrap steel≤40t,
The pig iron selects primes, amount of allocating >=50t, steel scrap and pig iron ratio >=30%.
Refining procedure of the present invention, seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 0.8~1.2MPa, are blown
Then argon gas retention time >=10min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time >=15min,
Total refining time >=50min, skims after refining.
Continuous casting working procedure of the present invention is poured 15~35 DEG C of the degree of superheat, 0.70~0.80m/min of continuous casting billet pulling rate；Using
Electromagnetic agitation, electricity stir 430~450A/Hz, and dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 20~35
DEG C, dynamic soft-reduction: 0.75mm/m.
Continuous casting billet cleaning process of the present invention, continuous casting billet clear up temperature >=150 DEG C, and longitudinally bilateral cleaning is deep wide for continuous casting billet
Than >=2:6, surface flawless.
S355G8+M-Z35 super thick ultra-wide continuous casting billet product standard of the present invention refers to EN10029-1991；Continuous casting billet detection side
Method refers to YB/T 4003-2016.
The beneficial effects of adopting the technical scheme are that 1, Design of Chemical Composition of the invention is low using low charcoal
Alloy content, production method reduce production cost using being vacuum-treated.2, the S355G8+M-Z35 of the method for the present invention production is super
Thick ultra-wide continuous casting billet dense internal organization, degree of purity are high, nonmetal inclusion four≤1.5 ranks of evaluation, at the same relative to steel ingot at
Production procedure and period are just shortened, lumber recovery is greatly improved, reduces smelting cost.3, the super thick of the method for the present invention production
Ultra-wide continuous casting billet maximum section is 330mm × 2400mm, meets high-quality S355G8+M-Z35 super thick ultra-wide steel plate production requirement,
Process stabilizing, it is at low cost, it can be achieved that batch localization.
Specific embodiment
The present invention will be further described in detail below with reference to specific embodiments.
Embodiment 1
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 330mm × 2400mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.08%, Si:0.25%, Mn:1.60%, P:0.007%, S:0.001%, Cr:0.18%, Ni:0.45%,
Al:0.035%, Cu:0.01%, N:0.0040%, Nb:0.030%, V:0.040%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 35t in furnace charge, the pig iron selects level-one
Product, amount of allocating 75t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 12min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 20min, total refining time 60min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.75kg/t steel, Al line 5.5kg/t steel, vacuum degree reaches
66Pa, vacuum retention time 20min；
(4) continuous casting working procedure: 25 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.72m/min, using electromagnetic agitation, electricity stirs 445A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 22 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.007%, S:0.001%；It is internal
Dense structure: center porosity≤1.5 grade, continuous casting slab segregation≤1.5 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤1.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 2
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 300mm × 2400mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.06%, Si:0.30%, Mn:1.55%, P:0.006%, S:0.002%, Cr:0.17%, Ni:0.40%,
Al:0.032%, Cu:0.01%, N:0.0036%, Nb:0.027%, V:0.020%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 33t in furnace charge, the pig iron selects level-one
Product, amount of allocating 60t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 11min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 18min, total refining time 55min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.65kg/t steel, Al line 4.5kg/t steel, vacuum degree reaches
66Pa, vacuum retention time 17min；
(4) continuous casting working procedure: 20 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.75m/min, using electromagnetic agitation, electricity stirs 435A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 25 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.006%, S:0.002%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.5 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤1.0, B class (alumina type)≤1.0, C class (silicates)≤1.5, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 3
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 300mm × 2000mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.055%, Si:0.30%, Mn:1.60%, P:0.007%, S:0.001%, Cr:0.17%, Ni:0.35%,
Al:0.032%, Cu:0.01%, N:0.0036%, Nb:0.027%, V:0.020%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 40t in furnace charge, the pig iron selects level-one
Product, amount of allocating 55t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 13min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 17min, total refining time 57min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.55kg/t steel, Al line 4.5kg/t steel, vacuum degree reaches
66Pa, vacuum retention time 17min；
(4) continuous casting working procedure: 22 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.72m/min, using electromagnetic agitation, electricity stirs 450A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 30 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.007%, S:0.001%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤1.5, B class (alumina type)≤1.0, C class (silicates)≤1.5, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 4
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 250mm × 1800mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.06%, Si:0.25%, Mn:1.56%, P:0.005%, S:0.003%, Cr:0.15%, Ni:0.30%,
Al:0.030%, Cu:0.01%, N:0.0020%, Nb:0.027%, V:0.036%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 40t in furnace charge, the pig iron selects level-one
Product, amount of allocating 55t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 10min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 17min, total refining time 55min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.45kg/t steel, Al line 3.5kg/t steel, vacuum degree reaches
66Pa, vacuum retention time 20min；
(4) continuous casting working procedure: 19 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.78m/min, using electromagnetic agitation, electricity stirs 430A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 30 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.005%, S:0.003%；It is internal
Dense structure: center porosity≤1.5 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤1.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 5
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 200mm × 2400mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.07%, Si:0.22%, Mn:1.58%, P:0.007%, S:0.003%, Cr:0.18%, Ni:0.30%,
Al:0.030%, Cu:0.01%, N:0.0020%, Nb:0.025%, V:0.037%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 28t in furnace charge, the pig iron selects level-one
Product, amount of allocating 75t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 10min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 16min, total refining time 60min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.70kg/t steel, Al line 5.0kg/t steel, vacuum degree reaches
64Pa, vacuum retention time 18min；
(4) continuous casting working procedure: 22 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.80m/min, using electromagnetic agitation, electricity stirs 445A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 32 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.007%, S:0.003%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤1.0, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 6
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 200mm × 2000mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.06%, Si:0.24%, Mn:1.58%, P:0.005%, S:0.001%, Cr:0.18%, Ni:0.30%,
Al:0.030%, Cu:0.01%, N:0.0018%, Nb:0.023%, V:0.023%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 35t in furnace charge, the pig iron selects level-one
Product, amount of allocating 55t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 13min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 16min, total refining time 55min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.60kg/t steel, Al line 4.0kg/t steel, vacuum degree reaches
58Pa, vacuum retention time 18min；
(4) continuous casting working procedure: 23 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.80m/min, using electromagnetic agitation, electricity stirs 435A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 27 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.005%, S:0.001%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤0.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 7
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 200mm × 2400mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.04%, Si:0.25%, Mn:1.53%, P:0.005%, S:0.001%, Cr:0.21%, Ni:0.25%,
Al:0.036%, Cu:0.01%, N:0.0017%, Nb:0.023%, V:0.030%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 35t in furnace charge, the pig iron selects level-one
Product, amount of allocating 55t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.0MPa, blowing argon gas retention time
Then 12min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 16min, total refining time 60min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.50kg/t steel, Al line 3.0kg/t steel, vacuum degree reaches
62Pa, vacuum retention time 18min；
(4) continuous casting working procedure: 21 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.77m/min, using electromagnetic agitation, electricity stirs 440A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 29 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 200 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 2:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.005%, S:0.001%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤0.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 8
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 330mm × 2400mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.10%, Si:0.20%, Mn:1.62%, P:0.015%, S:0.003%, Cr:0.30%, Ni:0.39%,
Al:0.020%, Cu:0.01%, N:0.0080%, Nb:0.050%, V:0.060%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 15t in furnace charge, the pig iron selects level-one
Product, amount of allocating 50t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 1.2MPa, blowing argon gas retention time
Then 11min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 15min, total refining time 50min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.40kg/t steel, Al line 6.0kg/t steel, vacuum degree reaches
55Pa, vacuum retention time 15min；
(4) continuous casting working procedure: 35 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.70m/min, using electromagnetic agitation, electricity stirs 430A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 20 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 150 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 3:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.015%, S:0.003%；It is internal
Dense structure: center porosity≤1.5 grade, continuous casting slab segregation≤1.0 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤0.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
Embodiment 9
The present embodiment S355G8+M-Z35 super thick ultra-wide Cross Section of CC Billet is 250mm × 2200mm, chemical component composition and matter
Measure percentage composition are as follows: C:0.05%, Si:0.40%, Mn:1.52%, P:0.006%, S:0.002%, Cr:0.25%, Ni:0.28%,
Al:0.050%, Cu:0.03%, N:0.0025%, Nb:0.024%, V:0.028%, remaining is Fe and inevitable impurity.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet production method includes ingredient, refining, vacuum processing, company
Casting, continuous casting billet cleaning process, specific process step are as described below:
(1) burden process: forbid being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel 38t in furnace charge, the pig iron selects level-one
Product, amount of allocating 59t；
(2) refining procedure: seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 0.8MPa, blowing argon gas retention time
Then 15min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time 20min, total refining time 52min,
It skims after refining；
(3) it is vacuum-treated process: being vacuumized after seat packet Ca Si wire feeding 0.80kg/t steel, Al line 2.0kg/t steel, vacuum degree reaches
60Pa, vacuum retention time 17min；
(4) continuous casting working procedure: 15 DEG C of the degree of superheat of casting, continuous casting billet pulling rate 0.75m/min, using electromagnetic agitation, electricity stirs 450A/Hz,
Dynamic soft-reduction is protected and taken to crystallizer secondary cooling water, and secondary cooling water temperature is 35 DEG C, dynamic soft-reduction: 0.75mm/m；
(5) continuous casting billet cleaning process: continuous casting billet clears up 170 DEG C of temperature, the longitudinal bilateral cleaning depth-to-width ratio 4:6 of continuous casting billet, surface without
Crackle.
The present embodiment S355G8+M-Z35 super thick ultra-wide continuous casting billet tissue degree of purity is high: P:0.006%, S:0.002%；It is internal
Dense structure: center porosity≤1.0 grade, continuous casting slab segregation≤1.5 grade, without white point；Nonmetal inclusion four evaluations: A class (vulcanization
Species)≤0.5, B class (alumina type)≤1.0, C class (silicates)≤1.0, D class (spherical oxide class)≤1.0, no folder
Slag；It is assessed as high-quality continuous casting billet.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (9)
1. a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billet, which is characterized in that the continuous casting billet chemical component composition and its matter
Measure percentage composition are as follows: C≤0.10%, Si:0.20~0.40%, Mn:1.52~1.62%, P≤0.015%, S≤0.003%, Cr+Mo
+ Ni+Cu≤0.70%, Al:0.020~0.050%, N≤0.008%, Nb+Ti+V≤0.11%, remaining is for Fe and inevitably
Impurity.
2. a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 1, which is characterized in that the continuous casting billet
Maximum section is 330mm × 2400mm.
3. a kind of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 1, which is characterized in that the continuous casting billet
Nonmetal inclusion four≤1.5 ranks of evaluation.
4. based on a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet described in claim 1-3 any one,
It is characterized in that, the production method includes ingredient, refining, vacuum processing, continuous casting, continuous casting billet cleaning process；The continuous casting work
Sequence is poured 15~35 DEG C of the degree of superheat, 0.70~0.80m/min of continuous casting billet pulling rate.
5. a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 4, which is characterized in that
The vacuum processing process vacuumizes after seat packet 0.40~0.80kg/t of Ca Si wire feeding steel, Al line 2.0~6.0kg/t steel, very
Reciprocal of duty cycle≤66Pa, vacuum retention time >=15min.
6. a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 4, which is characterized in that
The burden process, forbids being incorporated steel scrap ingot mould, slag steel, packet bottom, adding amount of scrap steel≤40t in furnace charge, the pig iron select primes,
Amount of allocating >=50t, steel scrap and pig iron ratio >=30%.
7. a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 4-6 any one,
It is characterized in that, the refining procedure, seat packet blowing argon gas, coarse adjustment alloy, Argon atmospheric pressure are controlled in 0.8~1.2MPa, Argon
Then gas retention time >=10min, sampling analysis after slag is white finely tune ingredient and enter internal control, white slag refining time >=15min, always
Refining time >=50min is skimmed after refining.
8. a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 4-6 any one,
It is characterized in that, the continuous casting working procedure, using electromagnetic agitation, electricity stirs 430~450A/Hz, and crystallizer secondary cooling water is protected and taken
Dynamic soft-reduction, secondary cooling water temperature are 20~35 DEG C, dynamic soft-reduction: 0.75mm/m.
9. a kind of production method of S355G8+M-Z35 super thick ultra-wide continuous casting billet according to claim 4-6 any one,
It is characterized in that, the continuous casting billet cleaning process, continuous casting billet clears up temperature >=150 DEG C, the longitudinal bilateral cleaning depth-to-width ratio of continuous casting billet
>=2:6, surface flawless.
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| CN110669992A (en) * | 2019-10-09 | 2020-01-10 | 舞阳钢铁有限责任公司 | Continuous casting billet for seawater corrosion resistant structural steel and production method thereof |
| CN113664174A (en) * | 2021-07-02 | 2021-11-19 | 包头钢铁（集团）有限责任公司 | Production method of steel S355NL commodity blank for wind power flange |
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