CN104498822B - Vehicle structure steel and its production method - Google Patents
Vehicle structure steel and its production method Download PDFInfo
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- CN104498822B CN104498822B CN201410742582.0A CN201410742582A CN104498822B CN 104498822 B CN104498822 B CN 104498822B CN 201410742582 A CN201410742582 A CN 201410742582A CN 104498822 B CN104498822 B CN 104498822B
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Abstract
The invention discloses a kind of vehicle structure steel, its chemical composition mass percent is：C：0.07 0.08%；Mn：0.8 1.0%；Si≤0.05%；P:0.015~0.025%；S≤0.010%；Als:0.04 0.05%, N:0.0020~0.0040, Nb:0.035~0.045%, O≤0.006, surplus is Fe and other trace elements.The present invention's also discloses a kind of method for producing above-mentioned vehicle structure steel, a kind of vehicle structure steel and its production method that the present invention is provided, pass through the reasonable control to composition, and on the basis of being optimized to techniques such as hot rolling, cold rolling and bell-type annealings, the features such as bell-type annealing steel plate produced has high intensity, high-elongation, good welds, product quality is improved, considerable economic benefit can be brought.
Description
Technical field
The present invention relates to ferrous materials production technical field, more particularly to a kind of vehicle structure steel and its production method.
Background technology
In recent years, with the development of science and technology, security, loss of weight consumption reduction and the reduction of automobile how to be improved to environment
Pollution as the new period focus.Automobile steel constantly develops towards high intensity direction, such as high-strength IF steel, baking hardened steel,
Low-alloy high-strength steel, dual phase steel, phase change induction plasticity steel, quenching distribution steel etc..420MPa level low alloy high-strength steel has high-strength
Degree and good punching performance, which turn into, meets one of material of automotive light weight technology demand.
Low-alloy high-strength steel refers to, by single or compound addition Nb, V, Ti element, pass through precipitation strength and refined crystalline strengthening
Obtain higher intensity grade.While good mechanical property is pursued, it is ensured that preferable punching performance and welding performance.Press
Requirements of the GB/T 20564.4 to similar steel grade, its composition is：C≤0.1%；Mn ,≤1.6%；Si≤0.5%；P≤
0.025%；S≤0.025%；Als >=0.015%, Ti≤0.15%, Nb≤0.09, surplus is Fe.National standard is to its yield strength
It is required that, 420~520MPa, tensile strength requires 470~590MPa, elongation percentage A80% >=17.
And continuous annealing production low-alloy high-strength steel also has that yield strength is higher in the prior art, elongation percentage is relatively low, formability
Can be poor the problem of.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of improve existing vehicle structure hardness of steel, elongation percentage and into
The vehicle structure steel and its production method of shape performance.
In order to solve the above technical problems, one aspect of the present invention is there is provided a kind of vehicle structure steel, its feature exists
In its chemical composition mass percent is C：0.07-0.08%；Mn：0.8-1.0%；Si≤0.05%；P:0.015~
0.025%；S≤0.010%；Als:0.04-0.05%, N:0.0020~0.0040, Nb:0.035~0.045%, O≤
0.006, surplus is Fe and other trace elements.
There is provided a kind of method for producing above-mentioned vehicle structure steel for another aspect of the present invention, it is characterised in that bag
Include：Molten steel is obtained into slab by continuous casting after refining；
The slab is heated, then hot rolled plate is obtained by roughing, finish rolling, the hot rolled plate is then subjected to laminar flow
Cooling, hot rolled coil is coiled into after cooling；
The hot rolled coil is passed through into cold rolling acquisition chill volume；
After the chill volume is buckled in inner cover, carry out cold sealing and sweep to blow to force out oxygen；
Detain heating mantles outside the inner cover to be heated, firing rate is 45-55 DEG C/h DEG C/h, soaking temperature for 665 ±
10 DEG C, soaking time is 7 hours；
Finally remove after the heating mantles, cooling dome is detained outside inner cover and carries out cooling acquisition strip, it is described to be detained outside inner cover
When cooling dome is cooled down, cooling velocity is 35-45 DEG C/h, and slow cooling transition temperature is 580 ± 10 DEG C；
By the strip after bell-type annealing it is flattened after coil into finished product.
Further, by the slab carry out hot rolling when, heating-up temperature be 1250 ± 30 DEG C, finishing temperature be 880 ±
20 DEG C, coiling temperature is 560 ± 20 DEG C.
Further, in the cold-rolled process, cold rolling reduction ratio control is in 68-73%.
Further, in the formation process, smooth elongation control is 0.6%.
A kind of vehicle structure steel and its production method that the present invention is provided, by the reasonable control to composition, are added micro-
Alloy element Nb, 420MPa level low alloy high-strength vehicle structure steel is obtained by Nb precipitation strength and refined crystalline strengthening,
And on the basis of being optimized to techniques such as hot rolling, cold rolling and bell-type annealings, the bell-type annealing steel plate produced have high intensity,
The features such as high-elongation, good welds, product quality is improved, considerable economic benefit can be brought.
Brief description of the drawings
Accompanying drawing 1 is the metallographic microstructure photo of vehicle structure steel provided in an embodiment of the present invention.
Embodiment
The invention provides a kind of vehicle structure steel, its chemical composition mass percent is：C：0.07-0.08%；Mn：
0.8-1.0%；Si≤0.05%；P:0.015~0.025%；S≤0.010%；Als:0.04-0.05%, N:0.0020~
0.0040, Nb:0.035~0.045%, O≤0.006, surplus is Fe and other trace elements.
The present invention is in the design basis of plain C-Mn steel, and the Nb element micro by adding prevents austenite recrystallization brilliant
Grain length is big, changes the recrystallization postponement during recrystallization power Xu, hot rolling deformation.In addition, with NbTiC, NbC in hot rolled plate
Influence crystal boundary or crystal boundary migration are separated out Deng nanosize particle form, strip is improved by Nb precipitation strength and refined crystalline strengthening strong
Degree, meanwhile, vehicle structure requires that formability and welding performance are higher with steel, and thick sulfide and oxide need to be avoided to separate out,
It must assure that hypoxemia low-sulfur.
The invention provides a kind of method for producing above-mentioned vehicle structure steel, including：
Step S1：Molten steel is obtained into slab by continuous casting after refining；
Step S2：The slab is heated, then hot rolled plate is obtained by roughing, finish rolling, then by the hot rolled plate
Section cooling is carried out, hot rolled coil is coiled into after cooling；When the slab is carried out into hot rolling, heating-up temperature is 1250 ± 30 DEG C,
Finishing temperature is 880 ± 20 DEG C, and coiling temperature is 560 ± 20 DEG C.Hot rolling technology of the present invention uses high heating-up temperature, high end
Roll temperature and relatively low coiling temperature, it is ensured that while band hardness of steel, also need to improve the elongation percentage of product, bell-type annealing was produced
Relatively low annealing temperature and shorter soaking time are used in journey, on the one hand ensures that strip completes recrystallization, promotes favourable
The formation of texture { 111 }, on the other hand avoids recrystal grain from excessively growing up, and the intensity of strip is improved by refined crystalline strengthening.
Step S3：The hot rolled coil is passed through into cold rolling acquisition chill volume；In the cold-rolled process, cold rolling reduction ratio control exists
68-73%.
Step S4：After the chill volume is buckled in inner cover, carry out cold sealing and sweep to blow to force out oxygen；
Step S5：Detain heating mantles outside the inner cover to be heated, firing rate is 45-55 DEG C/h, and soaking temperature is 665
± 10 DEG C, soaking time is 7 hours；
Step S6：Finally remove after the heating mantles, outside inner cover detain cooling dome carry out cooling obtain strip, it is described including
When the outer button cooling dome of cover is cooled down, cooling velocity is 35-45 DEG C/h, and slow cooling transition temperature is 580 ± 10 DEG C；
Step S7：By the strip after bell-type annealing it is flattened after coil into finished product.It is real in order to eliminate product stretching
Yield point elongation when testing, prevents steel plate finished product from occurring luders band defect in stamping process and improves the ageing resistance of product
Performance, while ensureing preferable plate shape, the present invention is controlled using 0.6% smooth elongation percentage.
A kind of vehicle structure steel and its production method that the present invention is provided, by the reasonable control to composition, are added micro-
Alloy element Nb, 420MPa level low alloy high-strength vehicle structure steel is obtained by Nb precipitation strength and refined crystalline strengthening,
And on the basis of being optimized to techniques such as hot rolling, cold rolling and bell-type annealings, the bell-type annealing steel plate produced have high intensity,
The features such as high-elongation, good welds, product quality is improved, considerable economic benefit can be brought.
The present invention is further described below by specific embodiment.
Embodiment one：
Ingredient percent in 420MPa level HSLA vehicle structural steels and its production method that present invention implementation is provided
And technological parameter is as shown in table 1.
Table 1
As can be seen from Table 1, by adjusting hot-rolling coiling temperature, using suitable parameter and annealing, mechanics can be produced
Performance meets Automobile Plate stamping formabilily requirement.
Referring to Fig. 1, the metallographic microstructure of the 420MPa level HSLA vehicle structural steels provided from the embodiment of the present invention 1 shines
From the point of view of piece, it is clearly visible production board and is organized as cheese ferrite and a small amount of pearlite, grain size is 13 grades, tiny carbide
Precipitated phase is distributed in inside ferrite crystal grain.
Embodiment two：
The present embodiment place different from embodiment one be, the vehicle structure steel that the present embodiment is provided, its chemistry into
Point mass percent is：C：0.075%；Mn：0.9%；Si：0.01%；P:0.020%；S：0.005%；Als:0.045%,
N:0.0024, Nb:0.036%, O：0.003, surplus is Fe and other trace elements.The slab of mentioned component is being subjected to hot rolling
When, 1260 DEG C of heating-up temperature, finishing temperature is 880 DEG C, and coiling temperature is 568 DEG C.In cold-rolled process, cold rolling reduction ratio control exists
68%.Detain heating mantles outside the inner cover to be heated, firing rate is 46 DEG C/h, soaking temperature is 660 DEG C, and soaking time is
7 hours；When button cooling dome is cooled down outside inner cover, cooling velocity is 35 DEG C/h, and slow cooling transition temperature is 580 DEG C.Other ground
Side is completely the same with embodiment one.
Embodiment three
The present embodiment place different from embodiment one be, the vehicle structure steel that the present embodiment is provided, its chemistry into
Point mass percent is：C：0.077%；Mn：0.95%；Si：0.001%；P:0.023%；S：0.008%；Als:
0.048%, N:0.003, Nb:0.043%, O：0.001, surplus is Fe and other trace elements.By the slab of mentioned component
When carrying out hot rolling, 1270 DEG C of heating-up temperature, finishing temperature is 890 DEG C, and coiling temperature is 578 DEG C.In cold-rolled process, under cold rolling
Rate is controlled 70%.Detain heating mantles outside the inner cover to be heated, firing rate is 54 DEG C/h, soaking temperature is 658 DEG C,
The hot time is 7 hours；When button cooling dome is cooled down outside inner cover, cooling velocity is 44 DEG C/h, and slow cooling transition temperature is 585
℃.It is completely the same with embodiment one elsewhere.
Example IV
The present embodiment place different from embodiment one be, the vehicle structure steel that the present embodiment is provided, its chemistry into
Point mass percent is：C：0.071%；Mn：0.85%；Si：0.0001%；P:0.018%；S：0.0018%；Als:
0.043%, N:0.0035, Nb:0.037%, O：0.005, surplus is Fe and other trace elements.By the slab of mentioned component
When carrying out hot rolling, 1268 DEG C of heating-up temperature, finishing temperature is 875 DEG C, and coiling temperature is 548 DEG C.In cold-rolled process, under cold rolling
Rate is controlled 72%.Detain heating mantles outside the inner cover to be heated, firing rate is 49 DEG C/h, soaking temperature is 669 DEG C,
The hot time is 7 hours；When button cooling dome is cooled down outside inner cover, cooling velocity is 38 DEG C/h, and slow cooling transition temperature is 575
℃.It is completely the same with embodiment one elsewhere.
It should be noted last that, above embodiment is merely illustrative of the technical solution of the present invention and unrestricted,
Although the present invention is described in detail with reference to example, it will be understood by those within the art that, can be to the present invention
Technical scheme modify or equivalent substitution, without departing from the spirit and scope of technical solution of the present invention, it all should cover
Among scope of the presently claimed invention.
Claims (3)
1. a kind of method for producing vehicle structure steel, it is characterised in that
The vehicle structure is with the chemical composition mass percent of steel：
C：0.07-0.08%；Mn：0.8-1.0%；Si≤0.05%；P:0.015~0.025%；S≤0.010%；Als:
0.04-0.05%, N:0.0020~0.0040%, Nb:0.039~0.045%, O≤0.006%, surplus is Fe micro- with other
Secondary element；
Methods described includes：
Molten steel is obtained into slab by continuous casting after refining；
The slab is heated, then hot rolled plate is obtained by roughing, finish rolling, it is cold that the hot rolled plate then is carried out into laminar flow
But, hot rolled coil is coiled into after cooling；
The hot rolled coil is passed through into cold rolling acquisition chill volume；
After the chill volume is buckled in inner cover, carry out cold sealing and sweep to blow to force out oxygen；
Detain heating mantles outside the inner cover to be heated, firing rate is 45-55 DEG C/h, soaking temperature is 665 ± 10 DEG C, soaking
Time is 7 hours；
Finally remove after the heating mantles, cooling dome is detained outside inner cover and carries out cooling acquisition strip, it is described that cooling is detained outside inner cover
When cover is cooled down, cooling velocity is 35-45 DEG C/h, and slow cooling transition temperature is 580 ± 10 DEG C；
By the strip after bell-type annealing it is flattened after coil into finished product；
When the slab is carried out into hot rolling, heating-up temperature is 1250 ± 30 DEG C, and finishing temperature is 880 ± 20 DEG C, coiling temperature
For 540-571 DEG C.
2. the method for vehicle structure steel according to claim 1, it is characterised in that：
In the cold-rolled process, cold rolling reduction ratio control is in 68-73%.
3. the method for vehicle structure steel according to claim 1, it is characterised in that：
In the formation process, smooth elongation control is 0.6%.
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| CN201410742582.0A CN104498822B (en) | 2014-12-05 | 2014-12-05 | Vehicle structure steel and its production method |
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| CN201410742582.0A CN104498822B (en) | 2014-12-05 | 2014-12-05 | Vehicle structure steel and its production method |
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| CN104498822A CN104498822A (en) | 2015-04-08 |
| CN104498822B true CN104498822B (en) | 2017-09-05 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517498A (en) * | 2011-12-30 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | IF steel containing niobium and titanium for advanced automobile and annealing process |
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
| CN103469065A (en) * | 2013-08-23 | 2013-12-25 | 首钢总公司 | 340MPa-grade HSLA vehicle structural steel and production method thereof |
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| CN101724777B (en) * | 2008-10-21 | 2012-04-25 | 宝山钢铁股份有限公司 | Hot rolled wheel rim steel plate with tensile strength of 550MPa grade and manufacturing method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102517498A (en) * | 2011-12-30 | 2012-06-27 | 内蒙古包钢钢联股份有限公司 | IF steel containing niobium and titanium for advanced automobile and annealing process |
| CN102747281A (en) * | 2012-07-31 | 2012-10-24 | 首钢总公司 | Batch annealing interstitial-free (IF) steel and production method thereof |
| CN103469065A (en) * | 2013-08-23 | 2013-12-25 | 首钢总公司 | 340MPa-grade HSLA vehicle structural steel and production method thereof |
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