CN102031455A - Steel sheet for press quenching and method for producing same - Google Patents
Steel sheet for press quenching and method for producing same Download PDFInfo
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- CN102031455A CN102031455A CN2009101877804A CN200910187780A CN102031455A CN 102031455 A CN102031455 A CN 102031455A CN 2009101877804 A CN2009101877804 A CN 2009101877804A CN 200910187780 A CN200910187780 A CN 200910187780A CN 102031455 A CN102031455 A CN 102031455A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 66
- 239000010959 steel Substances 0.000 title claims abstract description 66
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000010791 quenching Methods 0.000 title abstract description 16
- 230000000171 quenching effect Effects 0.000 title abstract description 10
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000005096 rolling process Methods 0.000 claims abstract description 10
- 229910052796 boron Inorganic materials 0.000 claims abstract description 9
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 9
- 239000000126 substance Substances 0.000 claims abstract description 9
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 8
- 238000000137 annealing Methods 0.000 claims abstract description 7
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 5
- 238000004080 punching Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 7
- 229910052804 chromium Inorganic materials 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 3
- 238000002791 soaking Methods 0.000 claims description 2
- 229910000734 martensite Inorganic materials 0.000 abstract description 6
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000010960 cold rolled steel Substances 0.000 abstract description 3
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 3
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 238000004806 packaging method and process Methods 0.000 abstract 1
- 229910001562 pearlite Inorganic materials 0.000 abstract 1
- 238000004321 preservation Methods 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 238000005098 hot rolling Methods 0.000 description 8
- 239000011651 chromium Substances 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000009749 continuous casting Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910000760 Hardened steel Inorganic materials 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910000797 Ultra-high-strength steel Inorganic materials 0.000 description 2
- 229910001566 austenite Inorganic materials 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 238000003856 thermoforming Methods 0.000 description 2
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 241001417490 Sillaginidae Species 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 208000020442 loss of weight Diseases 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
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention discloses a steel plate for stamping quenching and a manufacturing method thereof, wherein the steel plate comprises the following chemical components in percentage by mass: 0.14 to 0.28 percent of C, less than 0.40 percent of Si, 0.4 to 2.0 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.004 percent of S, 0.016 to 0.040 percent of Al, 0.15 to 0.8 percent of Cr0.015 to 0.12 percent of Ti, 0.0001 to 0.005 percent of B, less than or equal to 0.005 percent of N, and the balance of Fe and inevitable impurities. The manufacturing method comprises the following steps: heating the blank to 1150-1250 ℃, preserving heat for 2.5-4 hours, roughly rolling, then finely rolling under a large reduction of multiple times, wherein the final rolling temperature is 830-950 ℃, cooling to the coiling temperature at a cooling speed of more than 10 ℃/s by laminar cooling after rolling, and the coiling temperature is 600-680 ℃. For cold-rolled steel sheets, hot-rolled steel strips are subjected to cold rolling, and are subjected to oil coating and packaging after being annealed by a pure hydrogen gas bell-type furnace. The annealing temperature is 550-650 ℃, and the heat preservation time is 3-5 h. The steel disclosed by the invention is simple in component design and good in hardenability, and the depth of a hardening layer which is more than HRC45 is 10-16 mm. The steel plate has ferrite and pearlite as structure, and after hot stamping and quenching, it can obtain full-martensite structure with tensile strength up to 1300N/mm2The above.
Description
Technical field
The present invention relates to a kind of punching press and quench, adopt the prepared thermoformed articles of steel plate of the present invention, be mainly used in the anti-striker and the intensity stiffener of automobile with steel plate and manufacture method thereof.
Background technology
In order to improve effective fuel availability, security and the environmental standard of automobile, force automobile industry to reduce automotive dead weight and also guarantee crashworthiness simultaneously, thereby require to improve component intensity.Using ultrahigh-strength steel plates is to realize the light-weighted important channel of automobile.The greatest problem that adopts ultrahigh-strength steel plates to produce automobile spare in room temperature is restriction and the resilience that is shaped.Parts such as automobile A column, B post, stiffening plate and collision prevention girders in the traditional design, most of cold punching technology of high tensile steel plate that adopts is made.High tensile steel plate intensity height, punching press at normal temperatures distortion, easy to crack, resilience is serious, the complicated shape part punching difficulty that is shaped.The punching press quenching technology mainly is to utilize metal at high temperature, its plasticity and ductility increase sharply, the characteristics that yield strength descends rapidly make part forming by mould, utilize the mould that water cooling system is housed that steel formability is quenched in mould simultaneously to obtain martensitic stucture simultaneously.
Patent documentation CN101275200A discloses " a kind of thermal forming martensite steel ".Introduced a kind of thermal forming martensite steel, mainly be applicable to the minimal thickness part steel of tensile strength in the hot stamping moulding of 1.3～1.7GPa.The main chemical compositions of this steel is formed (weight %): C:0.10%～0.33%, Si:0.50%～2.30%, Mn:0.50%～2.00%, P :≤0.020%, S :≤0.015%, Al:0.015%～0.060%, [O]≤0.002%, [N]≤0.002%～0.015% surplusly is Fe and inevitable impurity.In addition, also add B:0.0005%～0.0050%, Ti:0.02%～0.10%, Nb:0.02%～0.10%, V:0.02%～0.15%, in RE:0.001%～0.050% any or any more than.Tensile strength can reach 1.3-1.7GPa, unit elongation＞15%, and hydrogen causes delayed fracture susceptibility and obviously reduce, thus provide the foundation for automobile lightweight, high safety performanceization.There is complicated component in this invention, smelts the big problem of control difficulty.
Summary of the invention
The object of the invention is to provide a kind of punching press to quench with steel plate and manufacture method thereof.Steel plate has good hardening capacity, produce the above superstrength structural part of 1300MPa by hot stamped process, be used to make collision parts, support component and the strengthening part of automobile, solve in the prior art existing steel plate composition comparatively complicated, smelt problem such as difficult control.
The object of the present invention is achieved like this:
1. punching press is quenched and is used steel plate
The mass percent of steel plate chemical ingredients (Wt%) is: C:0.14%～0.28%, below the Si:0.40%, Mn:0.4%～2.0%, P :≤0.010%, S :≤0.004%, Al:0.016%～0.040%, Cr:0.15%～0.8%, Ti:0.015%～0.12%, B:0.0001%～0.005%, N :≤0.005%, surplus is Fe and unavoidable impurities.This steel grade has higher hardening capacity, as the baseplate material of hot stamping with steel, can carry out hot rolling and cold rolling production.Steel plate thickness is 0.70～4.0mm.
Alloy element action of the present invention is described as follows:
C：0.14％～0.28％
The hardenability of carbon major decision steel is to form martensitic element.In the middle low carbon steel, increase with the carbon amount, the CCT curve of steel moves to right, and increases the hardening capacity of steel, but compares with elements such as manganese, chromium, boron, and effect is very little.Carbon content increases, and reduces the Ac3 point, promotes austenite low temperature to form down, help quench treatment, but C content is lower than 0.14% o'clock DeGrain, and in addition, C content is higher than at 0.28% o'clock can cause the hardening break tendency.
Below the Si:0.40%
Si is raising steel plate hardening capacity and intensity element, but too high meeting influence the heat-punch member coating quality, and increases production cost.
Mn：0.4％～2.0％
Manganese is to enlarge the austenitic area element, and the manganese amount increases, and hardening capacity improves, and is very resultful element to strength of stability after quenching.Mn content increases, and reduces the Ac3 point, promotes austenite low temperature to form down, help quench treatment, but Mn content is lower than 0.4% o'clock DeGrain, and in addition, Mn content is higher than at 2.0% o'clock can cause the hardening break tendency.
Cr：0.15％～0.8％
Cr improves the steel hardenability element, and after quenching, helps the stable effective element of guaranteeing intensity.But, Cr content is lower than 0.15% this DeGrain, and is saturated if Cr content surpasses 0.8% this effect on the other hand, only can cause the increase of cost.
Ti：0.015％～0.12％
Titanium is mainly used in fixed nitrogen in boron steel, brought into play with the through hardening effect that guarantees boron.In addition, the effect that also has the toughness raising that makes quenching place.But it is not remarkable that Ti content is lower than 0.015% o'clock effect, in addition, reaches capacity if Ti content surpasses 0.12%, can cause Cost Growth.
B：0.0001％～0.005％
Add boron in the steel and can significantly improve hardening capacity, stability that can proof strength after the quenching.It is not remarkable that B content is lower than 0.0001% o'clock effect, and B content is higher than at 0.005% o'clock, and superfluous B and the N in the steel form the compound of B, reduces the performance of steel plate.
S, P are for to influence bad element to plate property, and be producing under the possible situation, low more good more.
Al：0.016％～0.040％
Al is the strengthening element in the steel, is lower than 0.016% and does not reach effect, determines that the upper limit 0.04% can cause that oxide compound increases in the steel, influences the quality of steel but be higher than.
N：≤0.005％
For the hot stamping steel that contains B, the content of N is low more good more, but crosses the low difficulty that can cause producing, and increases cost, therefore guarantees in the upper limit below 0.005%.
2. punching press is quenched and is used the steel plate manufacture method
1) mass percent of steel plate chemical ingredients of the present invention is: C:0.14%～0.28%, below the Si:0.40%, Mn:0.4%～2.0%, P :≤0.010%, S :≤0.004%, Al:0.016%～0.040%, Cr:0.15%～0.8%, Ti:0.015%～0.12%, B:0.0001%～0.005%, N :≤0.005%, surplus is Fe and unavoidable impurities.
2) production process route:
Hot-rolled sheet: converter smelting → external refining → sheet billet continuous casting → heating → rolling → batch → pickling → oiling → packing.
Cold-reduced sheet: coils of hot-rolled steel → pickling connection milling train group → batch → cover annealing → oiling → packing.
3) production stage:
The manufacture method of steel plate is: the continuous casting material with smelting composition of the present invention, be heated to 1150～1250 ℃, be incubated and carry out roughing after 2.5～4 hours, multi-pass is depressed finish rolling greatly then, 830～950 ℃ of finishing temperatures, roll the back and adopt the laminar flow cooling, to be chilled to coiling temperature greater than 10 ℃/s speed of cooling, 600～680 ℃ of coiling temperatures.Steel band is packed after pickling, oiling after the hot rolling.For cold-rolled steel sheet be hot rolled strip is carried out cold rolling, oiling packing after the pure hydrogen gas cover annealing.Annealing temperature is 550～650 ℃, soaking time 3～5h.
4) punching press is quenched with the tissue signature and the performance of steel plate:
Punching press quenching of the present invention should have uniform ferrite and pearlitic structure with the microtexture of substrate.The performance that steel plate should have is hot-rolled sheet: specification 1.70-4.00mm:Rel:320-630N/mm
2, Rm:480-800N/mm
2, A
80〉=13%; Cold-reduced sheet: specification 0.70-3.2mm:ReL:280-450N/mm
2, Rm＞450N/mm
2, A
80〉=16%.Selection for hot rolling and cold rolling hot stamping steel plate is determined according to the needs of required steel plate thickness and the manufacturing of actual thermoforming part.
Steel plate composition simplicity of design provided by the present invention, and have good hardening capacity, be 10-16mm greater than the depth of hardening zone more than the HRC45.Steel plate is organized as ferrite and perlite, after hot stamping is quenched, can obtain full martensitic structure, and tensile strength can reach 1300N/mm
2More than.Be as the member of automobile traveling part and the ideal material of various stiffening members, can play the energy-conservation effect of automobile loss of weight.Punching press hardened steel is mainly used in the auto parts such as A, B column reinforcement plate, front and back collision bumper, collision prevention girders, roof strong beam and chassis structure spare of making car.
Embodiment
1. punching press quenched nickelclad production process route
Hot-rolled sheet: converter smelting → external refining → sheet billet continuous casting → heating → rolling → laminar flow cools off → batches → pickling → oiling → packing.
Cold-reduced sheet: coils of hot-rolled steel → pickling connection milling train group → batch → cover annealing → oiling → packing.
Selection for hot rolling and cold rolling hot stamping steel plate is determined according to the needs of required steel plate thickness and the manufacturing of actual thermoforming part.
2. steel plate composition: table 1 is the chemical ingredients of steel of the present invention, by percentage to the quality.
The chemical ingredients wt% of table 1 steel plate
3. hot rolling system and cold rolled annealed system
Have the present invention and smelt the continuous casting material of composition, through heating, insulation, roughing and finish rolling, roll the back and adopt the laminar flow cooling, be chilled to coiling temperature with corresponding speed of cooling, steel band is packed after pickling, oiling after the hot rolling; For cold-rolled steel sheet is to carry out the hot rolled strip after smooth cold rolling.Cold rolling back steel plate carries out anneal in bell furnace, protective atmosphere is a pure hydrogen gas.Concrete hot rolling system and cold rolled annealed system see Table 2.
Table 2 hot rolling system and cold rolled annealed system
4. the characteristic parameter of punching press hardened steel sees Table 3.
The characteristic parameter of table 3 punching press hardened steel
5. plate property: table 4 has provided that quench by the punching press before and after the hot stamping process can situation with rigidity.Adopt the punching press quenching technology, make steel plate under the austenitizing state, cool off hot stamping moulding in the mould certainly, quench simultaneously to obtain superstrength.
Performance before and after table 4 hot stamping
Claims (6)
1. a punching press is quenched and is used steel plate, it is characterized in that: the mass percent of steel plate chemical ingredients is: C:0.14%～0.28%, and below the Si:0.40%, Mn:0.4%～2.0%, P :≤0.010%, S :≤0.004%, Al:0.016%～0.040%, Cr:0.15%～0.8%, Ti:0.015%～0.12%, B:0.0001%～0.005%, N :≤0.005%, surplus is Fe and unavoidable impurities.
2. punching press according to claim 1 is quenched and is used steel plate, it is characterized in that: C:0.18%～0.26%, Mn:0.8%～1.8%, Cr:0.15%～0.6%, Ti:0.02%～0.10%, B:0.0003%～0.003%.
3. punching press according to claim 1 is quenched and is used steel plate, it is characterized in that: C:0.18%～0.26%, Mn:1.6%～2.0%, Cr:0.15%～0.6%, Ti:0.06%～0.12%, B:0.0003%～0.003%.
4. punching press according to claim 1 is quenched and is used steel plate, it is characterized in that steel plate thickness is 0.70～4.0mm.
5. manufacture method that is used for any described steel plate of claim 1～4, it is characterized in that: the steel billet that will contain above-mentioned chemical ingredients is heated to 1150～1250 ℃, be incubated and carry out tandem rolling after 2.5～4 hours, 830～950 ℃ of finishing temperatures, roll the back and adopt the laminar flow cooling, batch to be chilled to 600～680 ℃, after pack after the pickling, oiling greater than 10 ℃/s speed of cooling.
6. manufacture method that is used for any described steel plate of claim 1～4, it is characterized in that: the steel billet that will contain above-mentioned chemical ingredients is heated to 1150～1250 ℃, be incubated and carry out tandem rolling after 2.5～4 hours, 830～950 ℃ of finishing temperatures, roll the back and adopt the laminar flow cooling, batch to be chilled to 600～680 ℃ greater than 10 ℃/s speed of cooling, hot rolled strip carries out cold rolling through pickling connection milling train group, cold rolling back coil of strip oiling packing after the pure hydrogen gas cover annealing, annealing temperature is 550～650 ℃, soaking time 3～5h.
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| CN2009101877804A CN102031455A (en) | 2009-09-30 | 2009-09-30 | Steel sheet for press quenching and method for producing same |
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|---|---|---|---|
| CN2009101877804A CN102031455A (en) | 2009-09-30 | 2009-09-30 | Steel sheet for press quenching and method for producing same |
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Application publication date: 20110427 |