CN102424933A - Hot-rolled high-strength strip steel and manufacturing method thereof - Google Patents
Hot-rolled high-strength strip steel and manufacturing method thereof Download PDFInfo
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- CN102424933A CN102424933A CN2011103942985A CN201110394298A CN102424933A CN 102424933 A CN102424933 A CN 102424933A CN 2011103942985 A CN2011103942985 A CN 2011103942985A CN 201110394298 A CN201110394298 A CN 201110394298A CN 102424933 A CN102424933 A CN 102424933A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 72
- 239000010959 steel Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 21
- 238000010079 rubber tapping Methods 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 21
- 229910052786 argon Inorganic materials 0.000 claims abstract description 16
- 238000007664 blowing Methods 0.000 claims abstract description 16
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 238000009749 continuous casting Methods 0.000 claims abstract description 14
- 229910052758 niobium Inorganic materials 0.000 claims abstract description 13
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 13
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 9
- 238000007670 refining Methods 0.000 claims abstract description 6
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 33
- 238000005098 hot rolling Methods 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 16
- 238000005452 bending Methods 0.000 claims description 13
- 239000012535 impurity Substances 0.000 claims description 13
- 238000012360 testing method Methods 0.000 claims description 13
- 229910052742 iron Inorganic materials 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000009864 tensile test Methods 0.000 claims description 8
- 239000000956 alloy Substances 0.000 claims description 7
- 229910045601 alloy Inorganic materials 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 5
- 229910008455 Si—Ca Inorganic materials 0.000 claims description 5
- 238000003723 Smelting Methods 0.000 claims description 5
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000004615 ingredient Substances 0.000 claims description 5
- 239000004571 lime Substances 0.000 claims description 5
- 239000002893 slag Substances 0.000 claims description 5
- 230000000881 depressing effect Effects 0.000 claims description 3
- 238000005204 segregation Methods 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 238000005266 casting Methods 0.000 abstract 2
- 239000010936 titanium Substances 0.000 description 13
- 239000010955 niobium Substances 0.000 description 10
- 239000011572 manganese Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 3
- 210000003041 ligament Anatomy 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a hot-rolled high-strength strip steel and a manufacturing method thereof. The percentage of the components of the strip steel is as follows: c: 0.05-0.10%, Si: 0-0.30%, Mn: 1.0-1.80%, P is less than or equal to 0.015%, S is less than or equal to 0.008%, Nb: 0.01 to 0.07%, Ti: 0.01-0.12%, Al: 0.01-0.05%, 0-0.0012%, N-0.0035%; the ReH is 580-670 MPa, the Rm is 690-750 MPa, the A is 19-30%, the AKv at-40 ℃ is 50-180J, and the d at 180 DEG is 2 a. The manufacturing method comprises the following steps: i, treating molten steel smelted by a converter until P is less than or equal to 0.010 percent and S is less than or equal to 0.020 percent; II, refining and fine-tuning components in LF; the components of the molten steel meet the requirements of tapping: III, continuous casting adopts full-process argon blowing protection casting; adopting a soft reduction technology; controlling the casting temperature to 1530-1560 ℃; VI, finishing temperature of hot continuous rolling: 820-880 ℃; laminar cooling mode: coiling temperature CT: 530 to 620 ℃. The hot-rolled high-strength strip steel manufactured by the invention meets the requirements of steel for engineering machinery.
Description
Technical field
A kind of hot rolling high strength band steel and method of manufacture thereof specifically are a kind of 550MPa level hot rolling high strength band steel and method of manufacture thereof
Background technology
Existing 550MPa level hot rolling high strength band steel user thinks that intensity is on the low side, for this reason after using; Need develop the higher hot rolling high strength band steel of intensity; Develop a kind of ys ReH 550Mpa, tensile strength Rm is 670～830MPa, unit elongation A >=16%;-40 ℃ of ballistic work AKv >=27J, the HS of 180 ° of cold bending test d=2a, H.T. hot rolling band steel.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing 550MPa level hot rolling high strength band steel, the present invention provides a kind of hot rolling high strength band steel, this hot rolled strip ys ReH >=550MPa; Tensile strength Rm670～830MPa; Unit elongation A >=16% ,-40 ℃ of ballistic work AKv >=27J, 180 ° of cold bending test d=2a.The method of manufacture of this steel is provided simultaneously.
This hot rolling high strength band steel is because this product mechanical property characteristics are HS; High-ductility, H.T.; Good welding property requirement; So chemical composition design adopts the thinking of low-carbon (LC), middle manganese, an amount of niobium, titanium, low-carbon (LC) is in order to ensure high plasticity, high toughness, and an amount of niobium, titanium micro-alloyedization of good weldableness and processability is in order to improve the intensity of steel plate.
The quality per distribution ratio of the chemical ingredients of this hot rolled strip is following:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%, S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%, 0≤0.0012%, N≤0.0035%; All the other are Fe and unavoidable impurities.
The ys ReH of band steel is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a
The method of manufacture of this hot rolled strip comprises following sequential steps:
The I converter smelting
With the preprocessed molten iron of S≤0.003%, the steel scrap of S≤0.020% is poured 180 tons of top and bottom combined blown converters into, and pretreated weight of molten iron is than>=70%, taps to stop oxygen blast in preceding 2 minutes; Tapping P≤0.010%, tapping S≤0.020%, tapping temperature≤1690 ℃, tap hole is good; The tapping control quantity of slag is not more than 1.8 tons of tappings and adds lime and alloy at ladle earlier, bag BOTTOM ARGON BLOWING in the ladle of tapping back, thermometric;
II LF refining
The LF stove takes off S and finishes back (S content is 0～0.006%); Composition (all will be confirmed whether target approach composition requirement to carbon, manganese, silicon and the whole alloying elements of other alloy in the fine setting steel; Like the miss the mark requirement; Need add alloy and finely tune composition, the composition that goes out operation at LF is essentially the finished product composition); Ladle feeds the Si-Ca line 2.5～3.5m/t before going out the LF station, and the weak stirring of BOTTOM ARGON BLOWING is more than 5 minutes;
The mass percent of the composition of molten steel reaches following requirement tapping:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%; S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%; 0≤0.0012%, N≤0.0035%, all the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast; Teeming temperature is controlled at 1530～1560 ℃;
The VI hot continuous rolling
Slab heating temperature: 1150～1300 ℃, heat-up time is greater than 180min; Finishing temperature: 820～880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:530～620 ℃; Rolling specs: 4～16mm.
Service check
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, and 180 ° of cold bending test d=2a are qualified.
The method of manufacture of above-mentioned hot rolling high strength band steel is characterized in that: when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
Hot rolling 550MPa level high strength band steel of the present invention; The mechanical property ys ReH >=550MPa of band steel, tensile strength Rm670～830MPa, unit elongation A >=16%;-40 ℃ of ballistic work AKv >=27J; 180 ° of cold bending test d=2a satisfy the technical requirements of engineering machinery with steel, and intensity, plasticity, toughness rational Match.
Embodiment
Specify the embodiment of high strength band steel and method of manufacture thereof below in conjunction with embodiment, but the embodiment of this high strength band steel and method of manufacture thereof is not limited to following embodiment.
Steel plate embodiment one
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 1800mm of the thick 10mm of steel plate is following:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.002％，Nb：0.06％，Ti：0.07％，Al：0.03％，0：0.0011％，N：0.0032％，
All the other are Fe and unavoidable impurities.
Band steel ys ReH is 590Mpa, and tensile strength Rm is 690Mpa, and unit elongation A is that 24% ,-40 ℃ of ballistic work AKv are 130J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment one
The embodiment of this hot rolling high strength band steel method of manufacture is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 165 tons, the mass percent of the composition of preprocessed molten iron is: all the other are Fe and unavoidable impurities for C 4.0% Si 0.26% S 0.002%;
Using S is 15 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.008%, tapping S:0.015%, tapping temperature: 1680 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, composition in (S≤0.006%) fine setting steel (the preceding C of fine setting is 0.05%, is adjusted into 0.07% before the tapping, and the preceding Ti of fine setting is 0.05%, is adjusted into 0.07% before the tapping) is preceding fed Si-Ca line operation 3.0m/t, and stirs 8 minutes a little less than the BOTTOM ARGON BLOWING.
The mass percent of the composition of molten steel is:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.002％，Nb：0.06％，Ti：0.07％，Al：0.03％，0：0.0011％，N：0.0032％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1538 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1240 ℃, heat-up time: 190min; Finishing temperature: 860 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:560 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 590Mpa, and tensile strength Rm is 690Mpa, and unit elongation A is that 24% ,-40 ℃ of ballistic work AKv are 130J, and 180 ° of cold bending test d=2a are qualified.
Steel plate embodiment two
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 2000mm of the thick 4mm of steel plate is following:
C：0.09％，Si：0.10％，Mn：1.55％，P：0.008％，S：0.001％，Nb：0.03％，Ti：0.09％，Al：0.02％，0：0.0012％，N：0.0035％，
All the other are Fe and unavoidable impurities.
Steel plate ys ReH is 600Mpa, and tensile strength Rm is 720Mpa, and unit elongation A is that 23% ,-40 ℃ of ballistic work AKv are 70J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment two
The manufacturing of this hot rolling high strength band steel method of manufacture be the band steel of steel plate embodiment two, present embodiment is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 160 tons, the mass percent of the composition of preprocessed molten iron is: O.002% all the other are Fe and unavoidable impurities to C 4.0% Si 0.28% S;
Using S is 20 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.007%, tapping S:0.014%, tapping temperature: 1685 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, (C was 0.07% to composition before the fine setting, is adjusted into 0.09% before the tapping in the fine setting steel; Ti is 0.07% before the fine setting; Be adjusted into 0.09% before the tapping, Al is 0.01% before the fine setting, is adjusted into 0.02% before the tapping); Feed Si-Ca line operation 3.0m/t before the departures of LF stove, and stirred 8 minutes a little less than the BOTTOM ARGON BLOWING.The mass percent of molten steel is:
C：0.09％，Si：0.10％，Mn：1.55％，P：0.008％，S：0.002％，Nb：0.03％，Ti：0.09％，Al：0.02％，0：0.0011％，N：0.0034％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1535 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1230 ℃, heat-up time: 190min; Finishing temperature: 880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:600 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 600Mpa, and tensile strength Rm is 720Mpa, and unit elongation A is that 23% ,-40 ℃ of ballistic work AKv are 70J, and 180 ° of cold bending test d=2a are qualified.
Steel plate embodiment three
Present embodiment is the high-strength ligament steel of a kind of hot rolling 550MPa level, and the quality per distribution ratio of wide its chemical ingredients of 1800mm of the thick 16mm of steel plate is following:
C：0.07％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.001％，Nb：0.06％，Ti：0.09％，Al：0.03％，0：0.0011％，N：0.0033％，
All the other are Fe and unavoidable impurities.
Steel plate ys ReH is 585Mpa, and tensile strength Rm is 692Mpa, and unit elongation A is that 26% ,-40 ℃ of ballistic work AKv are 150J, 180 ° of cold bending test d=2a.
Method of manufacture embodiment three
The embodiment of this hot rolling high strength band steel method of manufacture is a following sequential steps:
The I converter smelting
Adopt stove molten iron S:0.002%, 165 tons, the mass percent of the composition of preprocessed molten iron is: all the other are Fe and unavoidable impurities for C 4.0% Si 0.30% S 0.002%.
Using S is 15 tons of 0.012% steel scraps, pours 180 tons of top and bottom combined blown converters into, and terminal point is avoided after-blow; Tapping P:0.008%, tapping S:0.014%, tapping temperature: 1675 ℃, tap hole is good; The tapping control quantity of slag is in ladle, to add lime and alloy before 1.5 tons of tappings earlier, BOTTOM ARGON BLOWING, thermometric in the ladle.
II LF refining
After the LF stove took off the S end, (C was 0.07% to composition before the fine setting, is adjusted into 0.08% before the tapping in the fine setting steel; Ti is 0.07% before the fine setting; Be adjusted into 0.09% before the tapping, Al is 0.01% before the fine setting, is adjusted into 0.03% before the tapping); Feed Si-Ca line operation 3.0m/t before the departures of LF stove, and stirred 7 minutes a little less than the BOTTOM ARGON BLOWING.
The mass percent of molten steel is:
C：0.08％，Si：0.09％，Mn：1.60％，P：0.005％，S：0.001％，Nb：0.06％，Ti：0.09％，Al：0.03％，0：0.0011％，N：0.0034％，
All the other are Fe and unavoidable impurities.
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast, and teeming temperature is 1534 ℃.
The IV hot continuous rolling
Slab heating temperature: in process furnace, be heated to 1210 ℃, heat-up time: 190min; Finishing temperature: 850 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:550 ℃.
The V tensile testing
Hot rolled strip is carried out tensile testing, and steel plate ys ReH is 585Mpa, and tensile strength Rm is 692Mpa, and unit elongation A is that 26% ,-40 ℃ of ballistic work AKv are 150J, and 180 ° of cold bending test d=2a are qualified.
Above-mentioned three embodiment when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
Claims (4)
1. hot rolling high strength band steel, the quality per distribution ratio of its chemical ingredients is:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%, S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%, 0≤0.0012%, N≤0.0035%; All the other are Fe and unavoidable impurities;
The ys ReH of band steel is 580～670Mpa, and tensile strength Rm is 690～750Mpa, and unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a.
2. the method for manufacture of a hot rolling high strength band steel, it comprises following sequential steps:
The I converter smelting
With the preprocessed molten iron of S≤0.003%, the steel scrap of S≤0.020% is poured 180 tons of top and bottom combined blown converters into, and pretreated weight of molten iron is than>=70%, taps to stop oxygen blast in preceding 2 minutes; Tapping P≤0.010%, tapping S≤0.020%, tapping temperature≤1690 ℃, tap hole is good; The tapping control quantity of slag is not more than 1.8 tons; Tapping adds lime and alloy at ladle earlier, bag BOTTOM ARGON BLOWING in the ladle of tapping back, thermometric;
II LF refining
After the LF stove takes off the S end, composition in the fine setting steel; Ladle feeds the Si-Ca line 2.5～3.5m/t before going out the LF station, and the weak stirring of BOTTOM ARGON BLOWING is more than 5 minutes;
The mass percent of the composition of molten steel reaches following requirement tapping:
C:0.05～0.10%, Si:0～0.30%, Mn:1.0～1.80%, P≤0.015%; S≤0.008%, Nb:0.01～0.07%, Ti:0.01～0.12%, Al:0.01～0.05%; 0≤0.0012%, N≤0.0035%, all the other are Fe and unavoidable impurities;
The III continuous casting
Continuous casting adopts omnidistance blowing argon cast; Teeming temperature is controlled at 1530～1560 ℃;
The VI hot continuous rolling
Slab heating temperature: 1150～1300 ℃, heat-up time is greater than 180min; Finishing temperature: 820～880 ℃; The laminar flow type of cooling: band steel total length cooling; Coiling temperature CT:530～620 ℃; Rolling specs; 4～16mm.
3. the method for manufacture of hot rolling high strength band steel according to claim 2; It is characterized in that: behind step VI hot continuous rolling, hot rolled strip is carried out tensile testing, steel plate ys ReH is 580～670Mpa; Tensile strength Rm is 690～750Mpa; Unit elongation A is that 19～30% ,-40 ℃ of ballistic work AKv are 50～180J, 180 ° of cold bending test d=2a.
4. the method for manufacture of hot rolling high strength band steel according to claim 2 is characterized in that: when Step II I continuous casting, adopt the technology of gently depressing, to reduce or to eliminate center segregation with loose.
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| CN115198187A (en) * | 2022-07-08 | 2022-10-18 | 山西太钢不锈钢股份有限公司 | 400 MPa-level hot-rolled magnetic pole steel and manufacturing method and application thereof |
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