CN1017352B - Production technology for cold-rolled biphase steel - Google Patents
Production technology for cold-rolled biphase steelInfo
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- CN1017352B CN1017352B CN 88108596 CN88108596A CN1017352B CN 1017352 B CN1017352 B CN 1017352B CN 88108596 CN88108596 CN 88108596 CN 88108596 A CN88108596 A CN 88108596A CN 1017352 B CN1017352 B CN 1017352B
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Abstract
The present invention relates to production technology for cold-rolled biphase C-Mn steel, namely that Mn is used as hot-rolled strip steel for facilitating martensitic structures to form elements, after cold rolled operation is carried out, the hot-rolled strip steel enters a horizontal continuous annealing furnace with dry hydrogen and argon shield at a speed of 15*30 meters per minute; steel plates are heated 800 to 960 DEG C in a furnace end for 1 to 2 minutes, and then the steel plates pass through a holding zone of 730 to 780 DEG C with 110 to 150 meters of length; after the steel plates are discharged out of the furnace, wind cooling operation is carried out to room temperature at a speed of 20 to 30 DEG C per minute. The steel performance can achieve: sigma <s> is 280/330 N/mm<2>, sigma <b> is 520/580 N/mm <2>, delta <b> is 520/580 N/mm <2>, and delta <10>% is 34/39. The present invention can be used as automobile stamping pieces, automobile weight is greatly lightened, and oil is saved. The present invention is suitable for being used as steel for stamping forming with high strength.
Description
The present invention relates to the production technique of the system cold-rolled dual phase steel of a kind of impact briquetting high strength C-Mn.
Industrial impact briquetting steel of past for satisfying the ductility requirement, causes intensity and reduces to 330N/mm
2Below.Because intensity is low, the part wall thickness, it is big to expend steel, is particularly useful for automotive industry, and automotive dead weight is increased, and oil consumption increases.Used high-strength low-alloy steel in recent years, though intensity improves, the part wall thickness reduction has alleviated pts wt, and ductility is bad, δ
5Generally, be easy to cracking during punching press, increased the automobile production cost below 24%.Dual phase steel is the automobile new material of the seventies development, and industrially developed country such as America and Japan all drop into big strength fabric study, and apply.General straight carbon steel and low alloy steel tissue are ferrite and perlite.The two-phase steel organization of research is ferrite and martensite.
Before the present invention, the composition of cold-rolled biphase steel and production technique in the world, go up introduction for the 89th page as 1981 " Iron and Steel International " the 54th collection the 2nd phase " Dual Phase Steels:a product for the eighties ": the landlocked si of steel mill of the U.S., the higher carbon aluminium-killed steel of p content, obtain cold-rolled biphase steel through quenching～tempering～leveling technology, but its mechanical property only is σ
5Be 415/448N/mm
2, σ
bBe 596/650N/mm
2, δ
5% is 21/26, the so complicated resulting δ of process for cooling system
5% is similar to ordinary low-alloy steel, and performance improves extremely limited; Kawasaki, Japan company adopts the alkaline carbon aluminium-killed steel that adds precious metal element Cr, produces cold-rolled biphase steel, its mechanical property σ with the method for cooling of water spray vapour
5Be 196/354N/mm
2, σ
bBe 374/760N/mm
2, δ
5% is 28/42, though the plasticity raising is more, adds the production cost that precious metal element has increased steel; The cooling system of water spray vapour not only is difficult to control and template difficult quality guarantee in big production; Its institute's operating device that requires is good, and water spray vapour is often uneven because of globule size and accurate, forms steam film at surface of steel plate, influence the local cooling of steel plate, the excessive martensite that easily causes again of spray vapour quantity is too much, and the ductility of steel is reduced, unfavorable punching press, water spray vapour deficiency then can not form two-phase.
The external used annealing furnace of cold-rolled biphase steel of producing generally has two kinds, a kind of bell type annealing furnace of using, a kind of elongated continuous annealing furnace of using.Long with the bell type annealing furnace cycle, plate shape is also good not as continuous annealing furnace; With elongated continuous annealing furnace good plate cut, with short production cycle, but initial cost is big, is not suitable for some medium and small sized enterprises and adopts.
One of purpose of the present invention is to develop the system cold-rolled dual phase steel of the unusual simple C-Mn of a kind of composition, and another object of the present invention provides a kind of simple production technique: do not need long bell furnace and complicated elongated continuous annealing furnace of annealing cycle during thermal treatment.
Dual phase steel of the present invention is to smelt according to international conventional method of smelting low alloy steel, and its Chemical Composition is C:0.04～0.12 by weight percentage; Mn:1.0～1.8; Si:0.3～0.6; S≤0.04; P≤0.04; Surplus is the Cu that brings in iron and ore, the steel scrap.
Cold-rolled biphase steel of the present invention is to strengthen steel with martensitic stucture, so do not need with expensive Cr, Ni, Mo element, and, control C, Mn element in the steel with of the agent of facilitating of cheap Mn element as generation duplex structure, just can facilitate two-phase to form, intensity and plasticity are provided effectively.C forms martensitic stucture and increases the effective factor of martensite numbers of poles, and it is 0.04～0.12% that the present invention adds C, is according to the Fe-C state diagram, calculates with lever rule.When C less than 0.04% the time, general smeltery is difficult for smelting; Be prone to banded structure again greater than 0.12 o'clock, influence the steel lateral performance.
Adding Mn among the present invention is 1.0～1.8%, and its purpose utilizes Mn to suppress austenitic transformation, and warm area changed martensite into and forms duplex structure during austenite was postponed till, and has perlite as if Mn in the content less than 1.0% o'clock and occurs constituting two-phase; If Mn was greater than 1.8% o'clock, martensite quantity increases, and reduces plasticity and unfavorable punching press.
Si is the solution strengthening element in the cold-rolled biphase steel steel of the present invention, and can make Ac
3Line slope increases, thereby makes thermal treatment temp guarantee martensitic percentage composition in the scope of broad, and Si＜0.3% strengthening effect weakens, and guarantee martensite content, heat-treatment temperature range is narrow, produces wayward greatly, Si＞0.6% strengthening effect height brings difficulty to impact briquetting.
S, P element need not specially to add in the cold-rolled biphase steel steel of the present invention, controlled during smelting just to reach S≤0.04%, and P≤0.04%, S, P content are low more favourable to performance.
Cold-rolled biphase steel production technique of the present invention is: in above-mentioned composition scope; smelt by common low alloy steel smelting system; continuous casting or die casting method obtain slab; through 1200～1250 ℃ of heating hot rollings; as-cold reduced coil of strip enters the Horizontal Continuous Furnace that has dry hydrogen and argon shield with 15～30/ component velocities; (dry hydrogen accounts for 5～10% in the shielding gas; all the other are argon gas) it is characterized in that cold-reduced sheet is in 1～2 minute internal heating to 800～960 of burner ℃; immediately 730～780 ℃ of soaking zone soaking of 110～150 meters long 4～10 minutes; be cooled to room temperature with the blowing of 20～30 ℃/component velocity after coming out of the stove, just can obtain duplex structure.Steel plate after the thermal treatment can be packed warehouse-in.This steel plate thickness from 1mm to 0.7mm, its performance: σ
5Be 280/330N/mm
2, σ
bBe 520/580N/mm
2, δ
10% is 35/39.
With example the present invention is illustrated below:
Example one: with C:0.11%; Mn:1.29%; Si:0.45%, P:0.03%, the die casting base of S:0.02%; after 1200～1250 ℃ of heating; be rolled into the thick hot rolled coil of 2.5mm, be cold-rolled to 1.0mm again, cold-reduced sheet enters the Horizontal Continuous Furnace that has dry hydrogen and argon shield with 25 meters/minute speed; dry hydrogen accounts for 6% in the shielding gas, and argon gas accounts for 94%.Steel plate is at 1.1 minutes internal heating to 940 of burner ℃, and 150 meters long 730 ℃ soaking zone soaking 6 minutes, coming out of the stove back was cooled to room temperature with the blowing of 28 ℃/component velocity immediately.Its mechanical property: σ
5Be 320N/mm
2, σ
bBe 560N/mm
2, δ
10% is 35.Punching parts is pressed the YB710-65 grade standard and is weighed, and qualification rate reaches 100%, reaches 98% if weigh qualification rate by the GB214-65 grade standard.
Example two: with C:0.07%, Mn:1.45%, Si:0.41%, P:0.03%, the continuously cast bloom of S:0.005% is through hot rolling, be cold-rolled to 0.7mm, cold rolling back steel plate enters the Horizontal Continuous Furnace that has dry hydrogen and argon shield with 20 meters/minute speed, and dry hydrogen accounts for 10% in the shielding gas, and argon gas accounts for 90%; Steel plate is at 1.9 minutes internal heating to 800 of burner ℃, and immediately 120 meters long 760 ℃ of soaking zone soaking 6 minutes, the back of coming out of the stove is cooled to room temperature with the air blast of 20 ℃/component velocity.This steel mechanical property: σ
5Be 330N/mm
2, σ
b580N/mm
2, δ
10Be 36%, by the standard punching parts of example one, qualification rate is respectively 100% and 98%.
Example three: with C:0.07%, Mn:1.45%, Si:0.41%, S:0.015%, the continuously cast bloom of P:0.025%, through hot rolling, cold rolling, to 0.8mm, steel plate enters the Horizontal Continuous Furnace that has dry hydrogen and argon shield with 15 meters/minute speed, and dry hydrogen accounts for 8% in the shielding gas, and argon gas accounts for 92%; Steel plate is at 1.4 minutes internal heating to 850 of burner ℃, and immediately 110 meters long 780 ℃ of soaking zone soaking 7.3 minutes, coming out of the stove back is cooled to room temperature with the blowing of 25 ℃/component velocity.This steel is used for punching press external board of vehicle door, wall thickness 0.8mm, needs 1.0mm with at present domestic used 08Al steel plate punching press wall thickness, and both compare and use dual phase steel of the present invention, can save steel 20%, and door skin is loss of weight about 20% also.
Comparative example one:
Cold-rolled biphase steel of the present invention, with the U.S., Japan cold-rolled biphase steel relatively see Table.
Find out that from comparative example cold-rolled biphase steel composition of the present invention is simple, production technique is easy.Find out from the mechanical property of production board: our steel plate is than the unit elongation height of the U.S. and have the low yield strength that stamped steel requires; With comparing of Japan, under the equality strength level conditions, unit elongation of the present invention is higher than Japan.
Cold-rolled biphase steel of the present invention is used to make automobile component and can alleviates the car deadweight because the intensity height is made stamping parts and can be saved steel 10～20%, reduce the driving oil consumption, because the also anti-collision of cold-rolled biphase steel is safe and reliable during operation, be the superior steel of automobile steel simultaneously.Cold-rolled biphase steel of the present invention is suitable for doing high strength impact briquetting steel most.
Claims (1)
- A kind of production technique of cold-rolled biphase steel, its Chemical Composition is C by weight percentage: 0.04～0.12; Mn: 1.0～1.8; Si: 0.3～0.6; S, P≤0.04; Surplus is the Cu that brings in iron and ore, the steel scrap; smelt, enter the continuous annealing furnace that has dry hydrogen and argon shield with 15-30 rice/component velocity by common low alloy steel smelting system through hot rolling, cold rolling one-tenth coil of strip; it is characterized in that cold-reduced sheet is in 1～2 minute internal heating to 800～960 of burner ℃; through 110～150 meters long 730～780 ℃ of soaking zone soaking 4～10 minutes, the back of coming out of the stove was air-cooled to room temperature with 20～30 ℃/component velocity again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108596 CN1017352B (en) | 1988-12-12 | 1988-12-12 | Production technology for cold-rolled biphase steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88108596 CN1017352B (en) | 1988-12-12 | 1988-12-12 | Production technology for cold-rolled biphase steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1043528A CN1043528A (en) | 1990-07-04 |
| CN1017352B true CN1017352B (en) | 1992-07-08 |
Family
ID=4835122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88108596 Expired CN1017352B (en) | 1988-12-12 | 1988-12-12 | Production technology for cold-rolled biphase steel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1017352B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102006001198A1 (en) * | 2006-01-10 | 2007-07-12 | Sms Demag Ag | Method and device for setting specific property combinations in multiphase steels |
| CN105297033A (en) * | 2014-05-30 | 2016-02-03 | 宝山钢铁股份有限公司 | Production method of hot-rolling, pickling-free, direct-cold-rolling and reduction annealing hot-dip product |
-
1988
- 1988-12-12 CN CN 88108596 patent/CN1017352B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1043528A (en) | 1990-07-04 |
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