CN1151913A - Production method of steel plate for automobile beam - Google Patents
Production method of steel plate for automobile beam Download PDFInfo
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- CN1151913A CN1151913A CN 96117687 CN96117687A CN1151913A CN 1151913 A CN1151913 A CN 1151913A CN 96117687 CN96117687 CN 96117687 CN 96117687 A CN96117687 A CN 96117687A CN 1151913 A CN1151913 A CN 1151913A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 49
- 239000010959 steel Substances 0.000 title claims abstract description 49
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 238000005096 rolling process Methods 0.000 claims abstract description 18
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 15
- 238000005098 hot rolling Methods 0.000 claims abstract description 10
- 239000000203 mixture Substances 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims abstract description 3
- 239000000126 substance Substances 0.000 claims description 8
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- 150000002910 rare earth metals Chemical class 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910052710 silicon Inorganic materials 0.000 claims description 4
- 238000009749 continuous casting Methods 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 5
- 238000005275 alloying Methods 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 10
- 229910052758 niobium Inorganic materials 0.000 description 8
- 239000010955 niobium Substances 0.000 description 8
- GUCVJGMIXFAOAE-UHFFFAOYSA-N niobium atom Chemical compound [Nb] GUCVJGMIXFAOAE-UHFFFAOYSA-N 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 5
- 239000011572 manganese Substances 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 229910052719 titanium Inorganic materials 0.000 description 5
- 239000010936 titanium Substances 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
- 230000008025 crystallization Effects 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000011031 large-scale manufacturing process Methods 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- 229910001200 Ferrotitanium Inorganic materials 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical compound [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002650 habitual effect Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 229910017464 nitrogen compound Inorganic materials 0.000 description 1
- 150000002830 nitrogen compounds Chemical class 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a production method of a steel plate for an automobile beam, which is characterized in that only vanadium is adopted as a micro-alloying element of the steel plate for the automobile beam, and the steel plate is continuously cast into a plate blank. Performing controlled cooling on the steel in the hot rolling process; heating the mixture to 1200-1250 ℃; carrying out hot rolling at 1000-1100 ℃ after rough rolling; keeping the initial rolling temperature of finish rolling at 970-1050 ℃ and the final rolling temperature at 880-920 ℃; cooling the rolled plate blank from 920-880 ℃ to a coiling temperature range of 660-700 ℃ at an average cooling speed of 9.5-13.5 ℃/s. The product produced by the method has the advantages of good toughness and matching, excellent formability and the like.
Description
The invention belongs to hot-rolling metal strip technical field in continuous process, particularly relate to the production method of steel plate for automobile girder.
Because the effect of complex stresses such as automobile is subjected to various impacts in the process of moving, reverse, and automobile heavy duty and overload make that the service condition of automobile frame is quite harsh.Therefore, automobile factory is very strict with the requirement of hot rolled plate to the beam that is used for making its vehicle frame, not only requires it to have high intensity, and also has the coupling of good plasticity and toughness and obdurability.Simultaneously, its chemical composition, mechanical property and processing performance aspect also had specific (special) requirements.
As everyone knows, niobium, vanadium, titanium have very strong affinity to carbon, nitrogen and sulphur.Their carbon, nitrogen compound solubility in austenite and the small and dispersed particle ability that is settled out in austenite and ferrite are for strengthening mechanism provides a basis.Because niobium, vanadium, titanium all can produce different influences to the reinforcement behavior in its solubility, dispersivity, sediment, each difference aspect crystallization kinetics and the conversion characteristic again.Therefore, the hot-rolled steel sheet that is used to produce automobile frame both at home and abroad is mainly niobium steel or titanium steel, and this is to be different because niobium and the precipitation kinetics of titanium, sedimentary size are compared with vanadium with sedimentation effect.Choose niobium and the titanium conduct habitual micro alloying element of automobile industry hot-rolled steel sheet for a long time, be that people have the ability of strong crystal grain thinning and titanium had the preference of reinforcement and control sulphide shape double action aspect characteristic niobium.Think that on the contrary the solution temperature of vanadium is low, the effect that stops crystallization a little less than, crystallization more just there is retardation function below 900 ℃ the time, to producing steel plate for automobile girder unfavorable (seeing in December, 1984 P185 of " microalloying of steel and controlled rolling " metallurgical industry publishing house).Therefore, vanadium is not used for steel plate for automobile girder and the more deep research of production method aspect do thereof as microalloy element so far both at home and abroad.With regard to containing niobium or titaniferous steel plate for automobile girder and production technology thereof at present, obvious deficiency is arranged also separately: for example contain the niobium steel plate for automobile girder, must carry out controlled rolling and controlled cooling, depress realization greatly at low temperature; Rigidity and ability to its production equipment has higher requirement simultaneously.And the production of titaniferous steel plate for automobile girder, to its chemical composition and technological parameter, especially the sensitiveness to temperature is very strong; Its performance inconsistency is bigger, and yield tensile ratio is higher, and the cold forming resilience is big, and same volume poor performance is big etc.; Very tight to the technology controlling and process requirement aborning, be unfavorable for a large amount of enforcements of producing.
The objective of the invention is, use the microalloy element of vanadium, add proper amount of rare-earth, on continuous rolling process, produce the production method of steel plate for automobile girder by temperature control as steel plate for automobile girder.This method not only can suppress the adverse effect of v element, and can give full play to the beneficial effect of v element, and helps at its qualified products of industrial large-scale production.The intensity rank height of its product, its plasticity
The production method of steel plate for automobile girder is that the chemical composition (weight %) that enters the preceding steel plate for automobile girder molten steel of conticaster crystallizer is: 0.08～0.12%C, 0.40～0.60%Si, 0.90～1.20%Mn, 0.04～0.10%V, 0.005～0.015%S, P≤0.025%.In crystallizer, add rare earth, make to enter in it in molten steel RE/S in 1.5～2.5; RE/S is preferably in 1.7～2.2.
Be further, when above-mentioned continuous casting steel billet is carried out hot continuous rolling:
A, be heated to 1200～1250 ℃;
B, the intermediate slab after the roughing is carried out hot rolling at 1000～1100 ℃;
C, make the intermediate slab start rolling temperature that enters finishing mill remain on 970～1050 ℃;
D, make its finishing temperature remain on 880～920 ℃;
E, make and roll back sheet material and be cooled to 700～660 ℃ from 920～880 ℃ with the Mean Speed of 9.5～13.5 ℃/s;
F, make its coiling temperature remain on 660～700 ℃.
Further be to make the coiling temperature of sheet material remain on 670～680 ℃.
The control carbon content is to limit the steel medium pearlite on 10～15% level.
The effect of manganese mainly is solution strengthening, reduces γ-α phase transition temperature, crystal grain thinning; Improve the plasticity of steel simultaneously.Silicon mainly plays the solution strengthening effect in steel.
Add an amount of rare earth,, make sulfide and oxide inclusions before solidification of molten steel, have an opportunity to float to reduce the solubility of sulphur oxygen in molten steel consumingly.That fails to float will change its form.
The carbon, nitride solid solution that impel vanadium in the steel in the heating process are in austenite.
After the roughing middle slab hot rolling is carried out samming, help vfanadium compound and evenly separate out, reduce the performance inconsistency of product; Remove its surperficial iron scale simultaneously, improve surface quality.
The control chilling temperature to impel ferrite crystal grain refinement in the steel, produces the refined crystalline strengthening effect; Increase the precipitation strength effect of vfanadium compound; The formation of control pearlite band shape.
The control coiling temperature to adjust the precipitation-hardening effect of vanadium, makes autobody sheet have good combination of strength and toughness and good mouldability.
The present invention has following obvious advantage:
1, overcomes people and for a long time vanadium has been used for the prejudice that steel plate for automobile girder exists.
2, can suppress vanadium effectively as the adverse effect of microalloy element, help giving full play to the beneficial effect of vanadium, and be suitable for its qualified products of industrial large-scale production steel plate for automobile girder.
3, adopt the chemical composition of design and the product that production method is produced thereof, its intensity rank height, plasticity and tenacity excellent, the obdurability coupling is good, and anisotropy is little, and is little with the volume poor performance.
Below, the present invention is further described.
The production method of steel plate for automobile girder is, after conventional methods such as converter smelting, microalloying, stove post processing, make the chemical composition (weight %) that enters the preceding steel plate for automobile girder molten steel of conticaster crystallizer be: 0.08～0.12%C, 0.40～0.60%Si, 0.90～1.20%Mn, 0.04～0.10%V, 0.005～0.015%S, P≤0.025%.The chemical composition value of test steel sees Table 1.In crystallizer, add rare earth, make the RE/S that enters molten steel in mold in 1.5～2.5, be preferably in 1.7～2.2.
The value of table 1 test steel chemical composition
| Sequence number | ????C | ???Si | ???Mn | ????P | ????S | ???V | Sequence number | ???C | ????Si | ????Mn | ????P | ????S | ??V |
| ????1 | ??0.12 | ??0.58 | ??1.16 | ??0.013 | ??0.016 | ??0.07 | ????7 | ??0.10 | ??0.52 | ??1.04 | ??0.014 | ??0.017 | ??0.06 |
| ????2 | ??0.12 | ??0.51 | ??0.91 | ??0.018 | ??0.009 | ??0.06 | ????8 | ??0.10 | ??0.54 | ??1.14 | ??0.016 | ??0.014 | ??0.07 |
| ????3 | ??0.12 | ??0.55 | ??0.99 | ??0.019 | ??0.011 | ??0.06 | ????9 | ??0.10 | ??0.52 | ??1.09 | ??0.017 | ??0.014 | ??0.07 |
| ????4 | ??0.10 | ??0.60 | ??1.13 | ??0.014 | ??0.016 | ??0.06 | ????10 | ??0.09 | ??0.46 | ??0.96 | ??0.016 | ??0.008 | ??0.06 |
| ????5 | ??0.12 | ??0.59 | ??1.10 | ??0.018 | ??0.014 | ??0.08 | ????11 | ??0.11 | ??0.57 | ??1.05 | ??0.016 | ??0.011 | ??0.06 |
| ????6 | ??0.10 | ??0.52 | ??1.10 | ??0.018 | ??0.014 | ??0.07 | ????12 | ??0.11 | ??0.55 | ??1.06 | ??0.017 | ??0.013 | ??0.07 |
200 * 1150 * 4250～5500mm slab that conventional continuous cast method is cast is delivered to 1450mm hot-rolling mill hot continuous rolling process.Earlier continuous casting steel billet is heated to 1200～1250 ℃; Again the intermediate slab after the roughing is carried out hot rolling at 1000～1100 ℃; Make the intermediate slab start rolling temperature that enters finishing mill remain on 970～1050 ℃; Make the slab finishing temperature remain on 880～920 ℃; Make and roll back sheet material and be cooled to 700～660 ℃ from 920～880 ℃ with the average cooling rate of 9.5～13.5 ℃/s; Make its coiling temperature remain on 660～700 ℃.The temperature controlling value of test steel in the operation of rolling sees Table 2, and the mechanical property of its coiled sheet sees Table 3, and the anisotropy difference of its coiled sheet sees Table 4.
The temperature controlling value of table 2 test steel in the operation of rolling
| Sequence number | Tapping temperature ℃ | Hot rolling temperature ℃ | Final rolling temperature ℃ | Coiling temperature ℃ | Roll and touch thickness mm | Sequence number | Tapping temperature ℃ | Hot rolling temperature ℃ | Final rolling temperature ℃ | Coiling temperature ℃ | Rolling thickness mm | ||
| Open rolling | Finish to gauge | Open rolling | Finish to gauge | ||||||||||
| 1 | ????1235 | ????1050 | ??990 | ?900 | ????670 | ????4.5??? | ?7 | ??1240 | ??1045 | ?970 | ?880 | ????680 | ????4.5 |
| 2 | ????1240 | ????1060 | ??980 | ?910 | ????690 | ????6.5 | ?8 | ??1230 | ??1030 | ?980 | ?920 | ????670 | ????4.5 |
| 3 | ????1225 | ????1040 | ??970 | ?910 | ????700 | ????6.5 | ?9 | ??1235 | ??1060 | ??1025 | ?920 | ????685 | ????5.0 |
| 4 | ????1230 | ????1050 | ??980 | ?905 | ????670 | ????6.0 | ?10 | ??1240 | ??1070 | ?1030 | ?920 | ????700 | ????5.0 |
| 5 | ????1240 | ????1070 | ??1000 | ?920 | ????690 | ????4.5 | ?11 | ??1235 | ??1060 | ?1035 | ?900 | ????700 | ????5.0 |
| 6 | ????1235 | ????1080 | ??1010 | ?890 | ????700 | ????6.0 | ?12 | ??1240 | ??1070 | ?1030 | ?910 | ????690 | ????6.5 |
The mechanical property of table 3 steel plate for automobile girder coiled sheet
Annotate: same sequence number is same test steel in above each table
| Sequence number | ????σs ????MPa | ????σb ????MPa | ?δ5 ??％ | Clod wash B=35mm, α=180 ° d=a | Sequence number | ???σs ????MPa | ????σb ????MPa | ??δ5 ????％ | Clod wash B=35mm, α=180 ° d=a |
| 1 | ????465 | ????590 | ??28 | Intact | ????7 | ????450 | ????550 | ????28 | Intact |
| 2 | ????400 | ????515 | ??29 | Intact | ??8 | ????460 | ????575 | ????30 | Intact |
| 3 | ????380 | ????515 | ??28 | Intact | ??9 | ????425 | ????530 | ????28 | Intact |
| 4 | ????455 | ????550 | ??27 | Intact | ??10 | ????415 | ????515 | ????31 | Intact |
| 5 | ????430 | ????535 | ??28 | Intact | ??11 | ????430 | ????545 | ????34 | Intact |
| 6 | ????460 | ????565 | ??31 | Intact | ??12 | ????400 | ????535 | ????29 | Intact |
The anisotropy difference of table 4 steel plate for automobile girder coiled sheet
| Sequence number | Specification mm | ??Δσs ??MPa | ??Δσb ??MPa | Δ δ 5 percentage points |
| ??1 | ????4.5 | ????＜30 | ????＜35 | ????＜3 |
| ??2 | ????5.0 | ????＜35 | ????＜20 | ????＜2 |
| ??3 | ????6.0 | ????＜20 | ????＜20 | ????＜2 |
| ??4 | ????6.5 | ????＜25 | ????＜15 | ????＜2 |
Claims (4)
1, the production method of steel plate for automobile girder is characterized in that, the chemical composition (weight %) that enters the preceding automotive sheet molten steel of conticaster crystallizer is: 0.08～0.12% C, 0.40～0.60%Si, 0.90～1.20Mn, 0.04～0.10%V, 0.005～0.015%S, P≤0.025%; In crystallizer, add rare earth, make the RE/S that enters in the molten steel in 1.5～2.5.
As the production method of the said steel plate for automobile girder of claim 1, it is characterized in that 2, wherein RE/S is preferably in 1.7～2.2.
3, as the production method of claim 1,2 said steel plate for automobile girder, it is characterized in that
A, heating up continuous casting plate blank to 1200～1250 ℃;
B, the intermediate slab after the roughing is carried out hot rolling at 1000～1100 ℃;
C, make the intermediate slab start rolling temperature that enters finishing mill remain on 970～1050 ℃;
D, make its finishing temperature remain on 880～920 ℃;
E, make and roll back sheet material and be cooled to 700～660 ℃ from 920～880 ℃ with the average cooling rate of 9.5～13.5 ℃/S;
F, make its coiling temperature remain on 660～700 ℃.
As the production method of the said automotive sheet of claim 3, it is characterized in that 4, wherein coiling temperature is preferably 670～680 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117687A CN1050540C (en) | 1996-08-29 | 1996-08-29 | Production method of steel plate for automobile beam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117687A CN1050540C (en) | 1996-08-29 | 1996-08-29 | Production method of steel plate for automobile beam |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1151913A true CN1151913A (en) | 1997-06-18 |
| CN1050540C CN1050540C (en) | 2000-03-22 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117687A Expired - Fee Related CN1050540C (en) | 1996-08-29 | 1996-08-29 | Production method of steel plate for automobile beam |
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| Country | Link |
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| CN (1) | CN1050540C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100519808C (en) * | 2007-12-05 | 2009-07-29 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN100529142C (en) * | 2007-03-29 | 2009-08-19 | 攀枝花钢铁(集团)公司 | Hot rolled steel plate for automobile beam and production method thereof |
| CN1970811B (en) * | 2005-11-25 | 2010-05-12 | 鞍钢股份有限公司 | High-strength cold-roll-forming structural steel and method for producing same |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5818964B2 (en) * | 1978-08-18 | 1983-04-15 | 日本鋼管株式会社 | Method for manufacturing high-strength hot-rolled steel sheets with excellent low-temperature toughness |
| CN1011792B (en) * | 1987-09-30 | 1991-02-27 | 国营内蒙第二机械制造总厂 | High strength-toughness cast steel adding rare-earth ca |
-
1996
- 1996-08-29 CN CN96117687A patent/CN1050540C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1970811B (en) * | 2005-11-25 | 2010-05-12 | 鞍钢股份有限公司 | High-strength cold-roll-forming structural steel and method for producing same |
| CN100529142C (en) * | 2007-03-29 | 2009-08-19 | 攀枝花钢铁(集团)公司 | Hot rolled steel plate for automobile beam and production method thereof |
| CN100519808C (en) * | 2007-12-05 | 2009-07-29 | 攀钢集团攀枝花钢铁研究院 | Vanadium-containing hot rolled steel plate and preparation method thereof |
| CN103014494A (en) * | 2011-09-21 | 2013-04-03 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
| CN103014494B (en) * | 2011-09-21 | 2014-11-05 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolling steel plate for automobile girder, and manufacturing method thereof |
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|---|---|
| CN1050540C (en) | 2000-03-22 |
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