CN102719736B - Steel with yield ratio of 0.9 or more used for ultra-fine grain slideway and production method thereof - Google Patents
Steel with yield ratio of 0.9 or more used for ultra-fine grain slideway and production method thereof Download PDFInfo
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- CN102719736B CN102719736B CN201210191164.8A CN201210191164A CN102719736B CN 102719736 B CN102719736 B CN 102719736B CN 201210191164 A CN201210191164 A CN 201210191164A CN 102719736 B CN102719736 B CN 102719736B
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Abstract
The invention relates to a steel with the yield ratio of 0.9 or more used for an ultra-fine grain slideway and a production method thereof. The steel mainly comprises the following components in percentage by weight: 0.03-0.07% of C, less than or equal to 0.03% of Si, 0.50-0.80% of Mn, 0.02-0.07% of Al, less than or equal to 0.03% of P, less than or equal to 0.015% of S, 0.02-0.07% of Nb, less than or equal to 0.06% of Mo and the balance of Fe and impurities. The production steps comprise hot metal desulphurization, converter smelting, ladle argon blowing, continuous casting, casting blank heating, hot rolling, reeling, ordinary scouring, cold rolling, continuous annealing, and leveling for stand-by. The defects that the existing same-level high-strength steel is low in yield and the specification and the welding of hot rolling materials are difficult to meet are overcome. The yield ratio of the steel disclosed by the invention achieves 0.9 or more, the grain size of the steel achieves 13 or more, and a steel plate has high yield ratio, appropriate elongation and good spot welding property.
Description
Technical field
The present invention relates to ferrous materials and production method thereof; belong to the method for a kind of superfine crystal particle slideway steel and production thereof; more properly be suitable for yield strength more than 700MPa, yield tensile ratio >=0.9 for automotive seat slideway or slide rail ultra-fine grained cold rolling steel and production method thereof.
Background technology
Automotive seat slideway or slide rail cold rolling steel used require to have high-yield strength, and have certain plasticity and good weldability, and Solid Solution Strengthened Steel is guaranteeing the high-intensity while, and its carbon equivalent significantly improves, and weldability is difficult to meet the demands.At present, auto enterprises manufacture chair slide or sliding rail steel are mainly to rely on to produce from external imported raw material.
Through retrieval, China Patent No. is ZL200510047632.4's " a kind of manufacture method of low carbon 700 MPa composite fertified ultrafine crystal band steel " patent documentation, it discloses chemical composition and weight percent content (wt%) is C:0.06 ~ 0.10, Si≤0.1, Mn:1.60 ~ 2.20, P < 0.01, S < 0.01, Nb:0.05 ~ 0.07, V:0.05 ~ 0.07, Ti:0.05 ~ 0.07, all the other are Fe, it belongs to hot-rolled steel sheet (finished product thickness 3 ~ 8mm), and slideway or sliding rail steel required thickness are at the cold rolled annealed steel of 1.4 ~ 1.6mm.As adopt hot-rolled steel cannot reach this thickness requirement, meanwhile, surface quality is also difficult to reach requirement.This documents steel is to adopt Nb, V, Ti microalloying, and content is all very high, and Mn content is also very high in addition, causes weldability not meet the demands.This documents steel microtexture is ferrite+bainite, the forming property deficiency of this kind of weave construction.
Summary of the invention
The invention reside in and overcome above-mentioned deficiency; provide a kind of process energy consumption low; stable mechanical property, and be not less than under the prerequisite of 700MPa meeting yield strength, yield tensile ratio >=0.9 required; unit elongation is not less than 15%; bending 180 ° of wide cold bending test, Bend diameter d=0, in metallographic structure; be 80～84% Deng axle ferrite volume percent content, steel and production method thereof for the superfine crystal particle slideway of yield tensile ratio >=0.9 that granular pearlite volume percent content is 16～20%.
Realize the measure of above-mentioned purpose:
A kind of superfine crystal particle slideway steel of yield tensile ratio >=0.9, its main ingredient and weight percent content are: C:0.03～0.07%, Si≤0.03%, Mn:0.50～0.80%, Al:0.02～0.07%, P≤0.03%, S≤0.015%, Nb:0.02～0.07%, Mo≤0.06%, all the other are Fe and inevitable impurity; Mechanical property: yield tensile ratio >=0.9, unit elongation is not less than 15%, bending 180 ° of wide cold bending test, Bend diameter d=0, in metallographic structure, waiting axle ferrite volume percent content is 80～84%, granular pearlite volume percent content is 16～20%, and grain size number is not less than 13 grades.
It is characterized in that: be also added with Cr≤0.07% or Cu≤0.05% or Ni≤0.06% or two kinds and above element wherein.
Produce a kind of method of steel for superfine crystal particle slideway of yield tensile ratio >=0.9, its step:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 5～10 minutes, and argon flow is 6 ~ 7 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1540～1550 ℃;
5) to strand heating, heating and temperature control is at 1200～1250 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 900～920 ℃;
7) batch, coiling temperature is controlled at 610～650 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 69～71%;
10) carry out continuous annealing: control preheating temperature at 770～820 ℃, and carry out routine insulation; Under the speed of cooling of 30～35 ℃/sec, be cooled to 350～450 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
The function and mechanism of each element and master operation in the present invention
C is cheap, and meanwhile, C is also solution strengthening element, and strengthening effect is fairly obvious, and C content is higher better to strengthening effect.But C too high levels, is unfavorable for guaranteeing the welding property of material.Therefore, C content is controlled at 0.03 ~ 0.07%.
Si element solid solution, in ferrite, improves the intensity of steel, but C too high levels, is unfavorable for guaranteeing the welding property of material.Therefore, the upper limit content of Si element of the present invention in steel is controlled at below 0.03%.
Mn element is conventional highly malleablized element, as austenite former, expanding austenitic area, reduces finishing temperature, postpones austenitic transformation, can play the effect of crystal grain thinning simultaneously.But Mn constituent content is too high, increase the hardening capacity of steel, make weld structure occur that hardened layer causes crackle weld seam and heat-affected zone crack Increased sensitivity.Therefore, Mn content is controlled to 0.50 ~ 0.80%.
In the present invention, Main Function is deoxidation in steelmaking process to Al, makes molten steel calmness.Meanwhile, in Finished Steel, have Al(N, C) separate out, play the intensity effect that improves steel.Therefore Al lower limit is controlled at 0.02%, and the upper limit is controlled at 0.07%.
P easily increases the cold shortness of steel, simultaneously unfavorable to plasticity, weldability and plasticity, and therefore, P content is controlled at below 0.030%.
S is unfavorable to the plasticity and toughness of material of the present invention, reduces erosion resistance, and meanwhile, for avoiding producing strand crackle, restriction S content, therefore, requires S≤0.015%.
Nb is a kind of strong carbonitride forming element, is conducive to precipitation strength, and can stops high temperature austenite too to be grown up, and has extremely strong Grain refinement.But Nb too high levels, easily causes carbonitride segregation, its processibility variation, meanwhile, has increased material cost.Therefore, Nb content is controlled at 0.02 ~ 0.07%.
Cr, Ni, Mo, Cu significantly improve yield strength, and increase erosion resistance.
The present invention also brings up to 900～920 ℃ to finishing temperature, to guarantee that the district's rolling of steel plate austenite one phase is to obtain uniform grain-size, excess Temperature, grain-size is thick, intensity is difficult to reach requirement, and temperature is too low, because of alloying element more, can there is mixed crystal phenomenon, cause mechanical property undesirable.
Product of the present invention, has solved existing same level high-strength steel and has surrendered the problem that low problem or hot rolling material specification and welding are difficult to meet the demands as dual phase steel and TRIP steel.Due to its yield tensile ratio reach 0.9 and more than, thereby guaranteed the shape stability of materials'use; Realized refined crystalline strengthening, and grain fineness number is reached more than 13 grades, steel plate has high-yield-ratio and moderate elongation and good spot weldability, has embodied and has had good market application foreground and significant Social benefit and economic benefit.
Accompanying drawing explanation
Accompanying drawing is that steel plate of the present invention amplifies 500 times of observations through metallographic, for waiting metallographic structure of axle ferrite+granular pearlite.
Embodiment
Below the present invention is described in detail:
Table 1 is chemical composition and the weight percent content list of various embodiments of the present invention and comparative example.
Table 2 is the main technologic parameters list of various embodiments of the present invention and comparative example, and it carries out according to following processing step:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 5～10 minutes, and argon flow is 6 ~ 7 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1540～1550 ℃;
5) to strand heating, heating and temperature control is at 1200～1250 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 900～920 ℃;
7) batch, coiling temperature is controlled at 610～650 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 69～71%;
10) carry out continuous annealing: control preheating temperature at 770～820 ℃, and carry out routine insulation; Under the speed of cooling of 30～35 ℃/sec, be cooled to 350～450 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
Table 3 is mechanical property and the list of metallographic structure detected result of various embodiments of the present invention and comparative example.
The component of table 1 various embodiments of the present invention and comparative example and the list of wt% content
| Embodiment | C | Si | Mn | P | S | Al | Nb | Cr | Cu | Ni | Mo | V | Ti |
| 1 | 0.03 | 0.01 | 0.80 | 0.010 | 0.008 | 0.04 | 0.05 | / | / | / | 0.03 | / | / |
| 2 | 0.05 | 0.01 | 0.60 | 0.010 | 0.008 | 0.04 | 0.04 | 0.03 | / | / | 0.05 | / | / |
| 3 | 0.07 | 0.01 | 0.50 | 0.010 | 0.008 | 0.04 | 0.02 | / | 0.04 | / | 0.06 | / | / |
| 4 | 0.07 | 0.01 | 0.50 | 0.010 | 0.008 | 0.04 | 0.03 | / | 0.04 | / | 0.02 | / | / |
| 5 | 0.05 | 0.01 | 0.60 | 0.010 | 0.008 | 0.04 | 0.04 | 0.03 | 0.04 | / | 0.05 | / | / |
| 6 | 0.03 | 0.01 | 0.80 | 0.010 | 0.008 | 0.04 | 0.07 | / | / | 0.05 | 0.03 | / | / |
| 7 | 0.06 | 0.01 | 0.55 | 0.009 | 0.010 | 0.05 | 0.06 | 0.07 | 0.05 | / | 0.04 | / | / |
| 8 | 0.04 | 0.01 | 0.62 | 0.012 | 0.006 | 0.038 | 0.05 | / | 0.03 | 0.02 | 0.03 | / | / |
| 9 | 0.06 | 0.02 | 0.04 | 0.013 | 0.006 | 0.045 | 0.05 | / | / | 0.06 | 0.04 | / | / |
| Contrast 1 | 0.06 | 0.10 | 2.20 | 0.003 | 0.008 | / | 0.05 | / | / | / | / | 0.07 | 0.07 |
| Contrast 2 | 0.10 | 0.07 | 1.60 | 0.007 | 0.005 | / | 0.06 | / | / | / | / | 0.07 | 0.06 |
| Contrast 3 | 0.06 | 0.08 | 1.60 | 0.003 | 0.006 | / | 0.07 | / | / | / | / | 0.05 | 0.07 |
The main technologic parameters list of table 2 various embodiments of the present invention and comparative example
The mechanical property of table 3 various embodiments of the present invention and comparative example and the list of metallographic structure detected result
As can be seen from Table 3, yield tensile ratio of the present invention is higher, and bending property is better, from microcosmic, can find out, the forming property of material of the present invention is more excellent.
Claims (4)
1. a superfine crystal particle slideway steel for yield tensile ratio >=0.9, its main ingredient and weight percent content are: C:0.03%, Si:0.01%, Mn:0.8 %, Al:0.04%, P:0.01%, S:0.008%, Nb:0.05%, Mo:0.03%, all the other are Fe and inevitable impurity; Production stage:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 6 minutes, and argon flow is 6 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1550 ℃;
5) to strand heating, heating and temperature control is at 1230 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 920 ℃;
7) batch, coiling temperature is controlled at 630 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 70%;
10) carry out continuous annealing: control preheating temperature at 800 ℃, and carry out routine insulation; Under the speed of cooling of 30 ℃/sec, be cooled to 380 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
2. a superfine crystal particle slideway steel for yield tensile ratio >=0.9, its main ingredient and weight percent content are: C:0.05%, Si:0.01%, Mn:0.6 %, Al:0.04%, P:0.01%, S:0.008%, Nb:0.04%, Cr:0.03%, Mo:0.05%, all the other are Fe and inevitable impurity; Production stage:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 7 minutes, and argon flow is 7 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1545 ℃;
5) to strand heating, heating and temperature control is at 1250 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 910 ℃;
7) batch, coiling temperature is controlled at 620 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 70%;
10) carry out continuous annealing: control preheating temperature at 770 ℃, and carry out routine insulation; Under the speed of cooling of 35 ℃/sec, be cooled to 400 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
3. the superfine crystal particle slideway steel of yield tensile ratio >=0.9, its main ingredient and weight percent content are: C:0.06%, Si:0.01%, Mn:0.55 %, Al:0.05%, P:0.009%, S:0.01%, Nb:0.06%, Cr:0.07%, Cu:0.05%, Mo:0.04%, all the other are Fe and inevitable impurity; Production stage:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 7 minutes, and argon flow is 7 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1545 ℃;
5) to strand heating, heating and temperature control is at 1210 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 920 ℃;
7) batch, coiling temperature is controlled at 625 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 69%;
10) carry out continuous annealing: control preheating temperature at 810 ℃, and carry out routine insulation; Under the speed of cooling of 32 ℃/sec, be cooled to 390 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
4. the superfine crystal particle slideway steel of yield tensile ratio >=0.9, its main ingredient and weight percent content are: C:0.04%, Si:0.01%, Mn:0.62 %, Al:0.038%, P:0.012%, S:0.006%, Nb:0.05%, Cu:0.03%, Ni:0.02%, Mo:0.03%, all the other are Fe and inevitable impurity; Production stage:
1) carry out desulfurizing iron, control S≤0.005% in molten iron;
2) converter smelting;
3) carry out ladle argon-blown, argon blowing time is 9 minutes, and argon flow is 7 cubic decimeters/second;
4) carry out continuous casting, carry out argon envelope protection cast, control teeming temperature at 1545 ℃;
5) to strand heating, heating and temperature control is at 1240 ℃;
6) carry out hot rolling, conventional roughing, controls finishing temperature at 905 ℃;
7) batch, coiling temperature is controlled at 625 ℃;
8) carry out conventional pickling;
9) carry out cold rolling, control total reduction 70%;
10) carry out continuous annealing: control preheating temperature at 805 ℃, and carry out routine insulation; Under the speed of cooling of 34 ℃/sec, be cooled to 375 ℃, and carry out being cooled to again room temperature after the timeliness of 120～150 seconds;
11) carry out smooth, and stand-by.
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| CN107164700B (en) * | 2017-05-27 | 2018-11-09 | 唐山钢铁集团有限责任公司 | A kind of 800MPa grades of high-yield-ratio cold-rolled strip and its manufacturing method |
| CN109440015A (en) * | 2018-11-12 | 2019-03-08 | 包头钢铁（集团）有限责任公司 | A kind of 400MPa grades of cold rolling sliding rail steel and its manufacturing method |
| CN109988970B (en) * | 2019-04-01 | 2021-08-31 | 山东钢铁集团日照有限公司 | Cold-rolled Q & P980 steel with different yield ratios and production method thereof |
| CN114107785B (en) | 2020-08-27 | 2022-10-21 | 宝山钢铁股份有限公司 | Gipa-grade bainite steel with ultrahigh yield ratio and manufacturing method thereof |
| CN113201691B (en) * | 2021-04-28 | 2022-03-22 | 攀钢集团攀枝花钢铁研究院有限公司 | Hot rolled steel plate for 590 MPa-level hydraulic bulging and preparation method thereof |
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| CN102395695A (en) * | 2009-04-13 | 2012-03-28 | 杰富意钢铁株式会社 | Cold-rolled steel sheet having excellent slow-aging property and high curability in baking, and method for producing same |
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