CN102925796B - Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof - Google Patents
Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof Download PDFInfo
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- CN102925796B CN102925796B CN201210425331.0A CN201210425331A CN102925796B CN 102925796 B CN102925796 B CN 102925796B CN 201210425331 A CN201210425331 A CN 201210425331A CN 102925796 B CN102925796 B CN 102925796B
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 title abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 21
- 239000010959 steel Substances 0.000 claims abstract description 21
- 238000005096 rolling process Methods 0.000 claims abstract description 8
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 4
- 238000000137 annealing Methods 0.000 claims description 10
- 238000005097 cold rolling Methods 0.000 claims description 10
- 238000005098 hot rolling Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 6
- 238000010583 slow cooling Methods 0.000 claims description 6
- 238000005516 engineering process Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 238000009749 continuous casting Methods 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 abstract description 11
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 229910052748 manganese Inorganic materials 0.000 abstract description 5
- 238000005728 strengthening Methods 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 abstract description 4
- 239000000956 alloy Substances 0.000 abstract description 4
- 229910001275 Niobium-titanium Inorganic materials 0.000 abstract description 3
- RJSRQTFBFAJJIL-UHFFFAOYSA-N niobium titanium Chemical compound [Ti].[Nb] RJSRQTFBFAJJIL-UHFFFAOYSA-N 0.000 abstract description 3
- 239000006104 solid solution Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 7
- 239000011572 manganese Substances 0.000 description 6
- 239000010955 niobium Substances 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 229910052758 niobium Inorganic materials 0.000 description 2
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910001257 Nb alloy Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 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 1
- 238000000465 moulding Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
The invention relates to the field of rolling of steel plates for automobiles, in particular to a production method of a non-alloyed ultra-low carbon structure cold-rolled plate, which is characterized in that the steel comprises the following chemical components in percentage by weight: 0.0020 to 0.0060 percent of C, less than or equal to 0.10 percent of Si, 0.30 to 0.80 percent of Mn, 0.030 to 0.080 percent of P, 0.010 to 0.025 percent of S, and ALS 0.020% to 0.060%, Bs 0.0003% to 0.0005%, and the balance Fe and inevitable impurities. Compared with the prior art, the invention has the advantages that: 1) the addition of niobium-titanium alloy is eliminated, and the solid solution strengthening effect of C, P and the like is applied, so that the cost is greatly reduced. 2) The yield strength and the tensile strength of the ultra-low carbon steel are improved, the excellent deep drawing performance of the ultra-low carbon steel is ensured, and the produced ultra-low carbon steel has high strength and good forming performance and meets the use purpose of the automobile industry.
Description
Technical field
The present invention relates to automotive sheet rolling field, particularly cold-reduced sheet and production method thereof for a kind of no-alloyed Ultra-low carbon structure.
Background technology
In the Ultra-low carbon product of Hyundai Motor steel plate, generally all add appropriate niobium or titanium alloy carrys out C, the N in sublimate steel, improve formed product performance.IF steel is gapless atomic steel, there is low-yield, low yield strength ratio, yield strength≤190MPa, the feature of traditional ultra low-carbon steel be carbon content extremely low≤0.004%, there is very strong deformability, prevent ram-type cracking, require to have good r value and n value simultaneously, to ensure smooth surface after moulding.21st century, world energy sources was supplied with growing tension, and for alleviating the consumption to the energy of automobile, the while does not affect the security requirement of automobile, and the automobile of high-strength light becomes main flow.
European standard EN10268-2006 proposes a series of new requirements to the production technology of autobody sheet, wherein HC220Y trade mark steel requires steel plate in having good super deep drawability, structural part and reinforcing member as automobile will have high-strength impact-resistant, both " high strength and ductility ", require ultra low-carbon steel to there is high yield strength (σ s=220～270MPa), high-tensile (Rm=350～420MPa), deep drawability (r=1.6～2.2, n=0.18～0.25), good ductility (A80 >=34%, A50 >=40%).
Generally adopt and in IF steel, add phosphorus and silicon or manganese, require it to have good mechanical property, and have good anti-secondary processing brittleness, chemical treatment properties and the zinc-plated adaptability of alloying, yield range is very little simultaneously, requires product to have very high stability.General high-strength steel adds niobium titanium alloy when adopting phosphorus as main strengthening element, though there is close technique at home and abroad, implementation has obvious difference, and the unit elongation of the method cannot meet user's demand.
Summary of the invention
The object of this invention is to provide a kind of no-alloyed Ultra-low carbon structure cold-reduced sheet and production method thereof, with the strengthening effect of niobium and titanium in the alternative ultra low-carbon steel of P, make steel plate in thering is good super deep drawability, there is high-strength impact-resistant, meet as the structural part of automobile and the performance requriements of reinforcing member.
For achieving the above object, the present invention realizes by the following technical solutions:
The thin brilliant Ultra-low carbon structure cold-reduced sheet of a kind of no-alloyed, the chemical composition of steel is by weight percentage: C 0.0020%～0.0060%, Si≤0.10%, Mn 0.30%～0.80%, P 0.030%～0.080%, S 0.010%～0.025%, AL
s0.020%～0.060%, Bs 0.0003%～0.0005%, surplus is Fe and inevitable impurity.
The production method of cold-reduced sheet for the thin brilliant Ultra-low carbon structure of above-mentioned a kind of no-alloyed, comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth, and concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 DEG C;
Roughing temperature out: 1050～1150 DEG C;
Finish rolling start rolling temperature: 1050～1150 DEG C;
Hot rolling finishing temperature: 850～930 DEG C;
Coiler plate temperature: 580～620 DEG C;
2) cold rolling: cold rolling draft: 73～87%;
3) continuous annealing: connect and move back 3～4 DEG C/s of temperature rise rate;
Annealing temperature: 820～840 DEG C;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 DEG C;
Slow cooling speed: 35～50 DEG C/s;
Rapid cooling section temperature: 400～300 DEG C;
Rapid cooling speed: 35～50 DEG C/s;
4) smooth unit elongation: 0.4%～2.0%.
On steel ultra low-carbon steel C≤0.010% basis, increase P content, improve surrender and the tensile strength of ultra low-carbon steel, ensure that it has good deep draw performance simultaneously, by optimizing the carbon content in steel, the intensity of the raising steel such as alloying element Mn, the Si that interpolation can be strengthened is avoided the secondary processing brittleness of steel, simultaneously boron add the secondary processing brittleness that suppresses P.
Utilize hot rolling low temperature coiling technique to avoid the formation of FePTi, prevent its destruction to stampability and high-elongation, avoided, because of two-phase particle, the inhibition of crystal boundary is improved to unit elongation by pure carbon element no-alloyed simultaneously, adjusting cold-rolling process soaking temperature makes product have { the 111} texture of higher strong punching press up to 820 degree above, utilize high polishing draft to obtain high tensile strength and yield strength, to ensure plasticity and the shock resistance of steel simultaneously.
Compared with prior art, the invention has the beneficial effects as follows:
1) cancel adding of niobium titanium alloy, the solution strengthening effects such as application C, P, and adopt the ultra low-carbon steel of high Mn as main component, P and Mn element are distributed with the effect of crystal grain thinning at grain boundaries, adjusting process makes refined crystalline strengthening, greatly reduces costs, and effect stability.
2) improve surrender and the tensile strength of ultra low-carbon steel, ensured that it has good deep draw performance simultaneously, produced and there is the forming property that high intensity has had again, met the application target of automotive industry.
Brief description of the drawings
Fig. 1 is continuous annealing process figure of the present invention;
Fig. 2 is cold-rolled products metallograph of the present invention.
Embodiment
Below in conjunction with embodiment, the present invention is further described:
The thin brilliant Ultra-low carbon structure cold-reduced sheet of a kind of no-alloyed of the present invention, the chemical composition of steel is by weight percentage: C 0.0020%～0.0060%, Si≤0.10%, Mn 0.30%～0.80%, P 0.030%～0.080%, S 0.010%～0.025%, AL
s0.020%～0.060%, Bs 0.0003%～0.0005%, surplus is Fe and inevitable impurity.Wherein Bs is acid-soluble boron.
A production method for cold-reduced sheet for the thin brilliant Ultra-low carbon structure of no-alloyed, comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth, and its concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 DEG C;
Roughing temperature out: 1050～1150 DEG C;
Finish rolling start rolling temperature: 1050～1150 DEG C;
Hot rolling finishing temperature: 850～930 DEG C;
Coiler plate temperature: 580～620 DEG C;
2) cold rolling: cold rolling draft: 73～87%;
3) see Fig. 1, continuous annealing process figure of the present invention: connect and move back 3～4 DEG C/s of temperature rise rate;
Annealing temperature: 820～840 DEG C;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 DEG C;
Slow cooling speed: 35～50 DEG C/s;
Rapid cooling section temperature: 400～300 DEG C;
Rapid cooling speed: 35～50 DEG C/s;
4) smooth unit elongation: 0.4%～2.0%.
Seeing Fig. 2, is cold-rolled products metallograph of the present invention, and cold-rolled products performance test effect of the present invention is in table 1:
Table 1
| Unit elongation A 50 | Yield strength | Tensile strength | R is average | N is average |
| 40～45 | 222～260 | 350～370 | 1.89～2.1 | 0.19～0.22 |
The present invention has met high yield strength (σ s=220～270MPa), the tensile strength (350～420MPa) of the ultra low-carbon steel for automobile structure and reinforcing member of European EN10268-2006 standard completely, deep drawability (r=1.6～2.2, n=0.18～0.25), the requirement of good ductility (δ >=34%).
Owing to not adding the alloy such as Nb or Ti in steel, there is no precipitation strength, C, Mn, P, the N of Main Basis exist in steel with the form of solid solution, make product there is very high intensity, produce and there is the forming property that high intensity has had again, can meet the thin brilliant Ultra-low carbon structural steel of no-alloyed of the super deep-draw needs of automotive industry.
Claims (1)
1. the production method of the thin brilliant Ultra-low carbon structure use cold-reduced sheet of no-alloyed, it is characterized in that, the chemical composition of steel is by weight percentage: C0.0020%～0.0060%, Si≤0.10%, Mn0.30%～0.80%, P0.030%～0.080%, S0.010%～0.025%, AL
s0.020%～0.060%, Bs0.0003%～0.0005%, surplus is Fe and inevitable impurity;
Its production method comprises smelting, continuous casting, hot rolling, cold-rolling pickling, continuous annealing, smooth, and its concrete technology parameter is:
1) hot rolling:
Billet heating temperature: 1200～1300 DEG C;
Roughing temperature out: 1050～1150 DEG C;
Finish rolling start rolling temperature: 1050～1150 DEG C;
Hot rolling finishing temperature: 850～930 DEG C;
Coiler plate temperature: 580～620 DEG C;
2) cold rolling: cold rolling draft: 73～87%;
3) continuous annealing: connect and move back 3～4 DEG C/s of temperature rise rate;
Annealing temperature: 820～840 DEG C;
Soaking time: 90～130s;
Slow cooling section temperature: 600～550 DEG C;
Slow cooling speed: 35～50 DEG C/s;
Rapid cooling section temperature: 400～300 DEG C;
Rapid cooling speed: 35～50 DEG C/s;
4) smooth unit elongation: 0.4%～2.0%.
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| CN201210425331.0A CN102925796B (en) | 2012-10-30 | 2012-10-30 | Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof |
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| CN201210425331.0A CN102925796B (en) | 2012-10-30 | 2012-10-30 | Non-alloyed ultra-low carbon cold-rolled sheet for structure and production method thereof |
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| Publication Number | Publication Date |
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| CN102925796A CN102925796A (en) | 2013-02-13 |
| CN102925796B true CN102925796B (en) | 2014-07-09 |
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| CN103789608A (en) * | 2014-02-11 | 2014-05-14 | 河北钢铁股份有限公司邯郸分公司 | Cold-based ultra-high strength galvanized sheet for structures and production method thereof |
| CN109440005A (en) * | 2018-11-14 | 2019-03-08 | 河钢股份有限公司承德分公司 | A kind of SAPH440 crystal grain refinement steel and its production method |
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2012
- 2012-10-30 CN CN201210425331.0A patent/CN102925796B/en active Active
Patent Citations (10)
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|---|---|---|---|---|
| WO2000034542A1 (en) * | 1998-12-07 | 2000-06-15 | Nkk Corporation | High strength cold rolled steel plate and method for producing the same |
| CN101171355A (en) * | 2005-05-03 | 2008-04-30 | Posco公司 | Cold rolled steel sheet having high yield ratio and less anisotropy, process for producing the same |
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