CN103555894A - Heat treatment process for Q&P980 steel - Google Patents
Heat treatment process for Q&P980 steel Download PDFInfo
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- CN103555894A CN103555894A CN201310520580.2A CN201310520580A CN103555894A CN 103555894 A CN103555894 A CN 103555894A CN 201310520580 A CN201310520580 A CN 201310520580A CN 103555894 A CN103555894 A CN 103555894A
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Abstract
The invention belongs to the technical field of heat treatment of materials, and particularly relates to a heat treatment process for Q&P980 steel. The heat treatment process for Q&P980 steel comprises the following specific steps that firstly, carrying out heat preservation on a Q&P980 cold-rolled steel plate subjected to pretreatment for 2-5 min at a temperature of 800-820 DEG C; then, after the heat preservation is completed, rapidly cooling the steel plate to 230-250 DEG C, carrying out heat preservation on the steel plate for 5-10 s, and after the steel plate is quenched, carrying out partitioning on the steel plate, wherein the partitioning temperature is 380-420 DEG C, and the partitioning time is 30-60 s; and finally, carrying out water quenching on the steel plate so as to obtain steel with a product of strength and elongation of 25000-25100 MPa % and a percentage elongation of 23.8-24%. According to the technical scheme of the invention, through the reasonable mutual cooperation of austenitizing, quenching and partitioning systems, the product of strength and elongation of the Q&P980 steel is improved.
Description
Technical field
The invention belongs to material heat treatment technical field, particularly a kind of Q & P980 Heat Treatment Of Steel technique.
Background technology
The world today, automobile is inseparable with people's life, but uses high energy consumption, the high pollution problem that automobile brings also to occur thereupon.Along with people constantly strengthen the attention of environmental protection, resource and the energy.People's exigence automobile is realized lightweight.
The main method of automobile lightweight is to reduce the thickness of steel plate, but for adopting traditional technology to become the automobile sheet material steel of output, reduces steel plate thickness meeting two large shortcomings, cannot meet production requirement.The first, the undercapacity of the steel that traditional plastic is good, along with the reduction of steel plate thickness, the non-deformability variation of automobile, the safety performance of automobile can not be guaranteed; The second, the steel plasticity that traditional intensity is high is too poor, has brought great difficulty to automobile production moulding process.
The model that Baosteel adopts Q & P thermal treatment process to become output is that the high-strength steel of Q & P980 is a kind of martensitic steel of novel high-strength and high-plasticity, belong to third generation high-strength steel, compare with traditional steel and there is excellent intensity and plasticity over-all properties, as vehicle structure, with steel, can greatly lower vehicle weight, strengthen the ability that car body opposing is clashed into, improve safety in operation, there is good development prospect.Yet the steel that industrial Q & P thermal treatment process is produced in the past, its strength and ductility product is all less than 23000MPa%, illustrate that existing heat treatment process parameter value still can not reach a satisfactory effect, the processing parameter wherein relating to can't reasonably cooperatively interact, reached optimized thermal effectiveness, therefore, Q & P heat treatment process parameter still needs to grope.
Summary of the invention
The problem existing for thermal treatment process in prior art, the invention provides a kind of Q & P980 Heat Treatment Of Steel technique, object is reasonably to cooperatively interact by austenitizing, quenching, partition system, improves the strength and ductility product of Q & P980 steel.
Realizing the technical scheme of the object of the invention carries out according to following steps:
(1) austenitizing: by the Q & P980 cold-rolled steel sheet through pre-treatment, in 800-820 ℃ of insulation 2-5min;
(2) quench: insulation finishes to cool to rapidly 230-250 ℃ of soaking time at 5-10s afterwards;
(3) partition: carry out partition after quenching, partition temperature is between 380-420 ℃, and the partition time, between 30-60s, is finally carried out shrend, obtains strength and ductility product and reaches the Q & P980 steel that 25000-25100MPa%, unit elongation reach 23.8-24%.
Described pre-treatment is that Q & P980 cold-rolled steel sheet is deoiled with rust cleaning, cleans up, to avoid the inequality of being heated in heat treatment process.
Compared with prior art, feature of the present invention and beneficial effect are:
The corresponding relation of the selection of austenite system and austenite, ferrite volume fraction in technical solution of the present invention, choose two-phase region austenitizing system, thereby obtain higher strength and ductility product to realize the properly distributed of austenite and ferrite volume fraction, final definite austenitizing temperature is between 820-840 ℃, austenitizing time, between 2-5min, quenches after austenitizing at once;
Quenching system selects austenite to have a significant impact to martensite transforming degree, choose suitable quenching system, can obtain more suitable austenite and martensite volume ratio, the present invention puts into rapidly salt bath by the tension specimen after austenitizing to quench, quenching temperature is between 230-250 ℃, and soaking time is between 5-10s.After quenching system completes, horse back carries out partition processing;
Because can making carbon atom mass efficient, the choose reasonable of partition system is enriched in austenite, can prevent separating out in a large number of carbide again, finally make material obtain a large amount of residual austenites, thereby by the TRIP effect of residual austenite, improve the strength and ductility product of material, sample after quenching is put into rapidly to salt bath partition, partition temperature is between 380-420 ℃, and the partition time, between 30-60s, finally obtains the automobile steel of high strength and ductility.
Thermal treatment process in the present invention, exactly by the content of residual austenite in the choose reasonable of austenitizing, quenching, partition system and the raising steel of trying one's best large that cooperatively interacts, thereby significantly improves the strength and ductility product of steel by the TRIP effect of residual austenite.Compare Q & P heat treating regime in the past, austenitizing in the present invention, quench, after partition system is combined together, the over-all properties producing is better, residual austenite content in can raising material by a larger margin, thereby increase substantially the strength and ductility product of material, higher more in the past than the steel strength and ductility product that industrial Q & P treatment production went out, more than reaching 25000MPa%, unit elongation wherein can reach 23.9%, this is that the numerical value that records of employing standard GB tension specimen is reliable, such unit elongation can significantly promote the processability of steel, thereby for automobile steel, has a development prospect.
In addition, the whole thermal treatment flow process time of technical solution of the present invention is short, and austenitizing system temperature is lower, has so just reduced Heating temperature, has saved heat treatment time.Comparing like this other thermal treatment process, can to improve significantly the production efficiency of steel high and cost-saving, has better application prospect in industrial production.
Accompanying drawing explanation
Fig. 1 is Electron Back-Scattered Diffraction (EBSD) figure of the Q & P980 steel that obtains of heat treating method of the present invention;
Fig. 2 is the TEM figure of the Q & P980 steel that obtains of heat treating method of the present invention.
Embodiment
In the embodiment of the present invention, be that the steel plate that thermal treatment is obtained makes according to GB/T228-2010 the standard tensile sample that gauge length is 25mm, utilize SANS-CMT5105 electronic universal tester, adopt crosshead displacement rate-controlling pattern at room temperature with the speed of 2mm/min, steel plate sample to be carried out to tension test, test its tensile strength, unit elongation and strength and ductility product, every embodiment gets 3 samples, results averaged, to guarantee the reliability of experimental data.
Embodiment 1
Q & P980 cold-rolled steel sheet rust cleaning is deoiled, clean up clean, to avoid the inequality of being heated in heat treatment process.
(1) austenitizing: by the Q & P980 cold-rolled steel sheet through pre-treatment, in 800 ℃ of insulation 5min;
(2) quench: insulation finishes to cool to rapidly 240 ℃ of soaking times at 8s afterwards;
(3) partition: carry out partition after quenching, partition temperature is between 380 ℃, the partition time is between 60s, finally carry out shrend, obtain the Q & P980 steel of hydrodynamics, as depicted in figs. 1 and 2, in EBSD software for calculation must be published picture, FCC is that the volume fraction of residual austenite is more than 15% mutually for its EBSD figure and TEM figure; From TEM picture, also can find out the residual austenite between a large amount of film like distributions and martensite lath.
After testing, its tensile strength is 1050MPa, and elongation after fracture is 23.9%, and strength and ductility product reaches 25095MPa%, far above traditional Q & P steel.
Embodiment 2
Q & P980 cold-rolled steel sheet rust cleaning is deoiled, clean up clean, to avoid the inequality of being heated in heat treatment process.
(1) austenitizing: by the Q & P980 cold-rolled steel sheet through pre-treatment, in 820 ℃ of insulation 2min;
(2) quench: insulation finishes to cool to rapidly 230 ℃ of soaking times at 5s afterwards;
(3) partition: carry out partition after quenching, partition temperature is between 420 ℃, and the partition time, between 30s, is finally carried out shrend, obtains the Q & P980 steel of hydrodynamics.
After testing, its tensile strength is 1054MPa, and elongation after fracture is 23.8%, and strength and ductility product reaches 25085MPa%, far above traditional Q & P steel.
Embodiment 3
Q & P980 cold-rolled steel sheet rust cleaning is deoiled, clean up clean, to avoid the inequality of being heated in heat treatment process.
(1) austenitizing: by the Q & P980 cold-rolled steel sheet through pre-treatment, in 810 ℃ of insulation 3min;
(2) quench: insulation finishes to cool to rapidly 250 ℃ of soaking times at 10s afterwards;
(3) partition: carry out partition after quenching, partition temperature is between 400 ℃, and the partition time, between 45s, is finally carried out shrend, obtains the Q & P980 steel of hydrodynamics.
After testing, its tensile strength is 1043MPa, and elongation after fracture is 24%, and strength and ductility product reaches 25032MPa%, far above traditional Q & P steel.
Claims (2)
1. a Q & P980 Heat Treatment Of Steel technique, is characterized in that carrying out according to following steps:
(1) austenitizing: by the Q & P980 cold-rolled steel sheet through pre-treatment, in 800-820 ℃ of insulation 2-5min;
(2) quench: insulation finishes to cool to rapidly 230-250 ℃ of soaking time at 5-10s afterwards;
(3) partition: carry out partition after quenching, partition temperature is between 380-420 ℃, and the partition time, between 30-60s, is finally carried out shrend, obtains strength and ductility product and reaches the Q & P980 steel that 25000-25100MPa%, unit elongation reach 23.8-24%.
2. according to a kind of Q & P980 Heat Treatment Of Steel technique described in claims, it is characterized in that described pre-treatment is that Q & P980 cold-rolled steel sheet is deoiled with rust cleaning, clean up, to avoid the inequality of being heated in heat treatment process.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109517946A (en) * | 2018-12-03 | 2019-03-26 | 上海交通大学 | Quenching partition integral treatment method in steel drop stamping and mold |
Citations (4)
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|---|---|---|---|---|
| CN101487096A (en) * | 2009-02-19 | 2009-07-22 | 北京科技大学 | Low-alloy high-strength C-Mn-Al Q & P steel and method of manufacturing the same |
| CN101775470A (en) * | 2010-03-02 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of low-alloy complex-phase (Q and P) steel |
| CN102212657A (en) * | 2011-06-09 | 2011-10-12 | 北京科技大学 | Quenching partition production method of cold-rolled transformation induced plasticity steel |
| CN103160680A (en) * | 2013-04-03 | 2013-06-19 | 北京科技大学 | Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487096A (en) * | 2009-02-19 | 2009-07-22 | 北京科技大学 | Low-alloy high-strength C-Mn-Al Q & P steel and method of manufacturing the same |
| CN101775470A (en) * | 2010-03-02 | 2010-07-14 | 武汉钢铁(集团)公司 | Production method of low-alloy complex-phase (Q and P) steel |
| CN102212657A (en) * | 2011-06-09 | 2011-10-12 | 北京科技大学 | Quenching partition production method of cold-rolled transformation induced plasticity steel |
| CN103160680A (en) * | 2013-04-03 | 2013-06-19 | 北京科技大学 | Q-and-PB (quenching and partitioning in bainite zone) heat treatment process for preparing 30 GPa%-grade complex-phase steel |
Non-Patent Citations (2)
| Title |
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| 庄宝潼 等: "汽车用高强度Q&P钢的组织与力学性能", 《北京科技大学学报》, vol. 34, no. 4, 30 April 2012 (2012-04-30) * |
| 赵才 等: "低碳硅-锰系Q&P钢的热处理工艺及实验室研究", 《金属热处理》, vol. 33, no. 2, 29 February 2008 (2008-02-29), pages 56 - 59 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109517946A (en) * | 2018-12-03 | 2019-03-26 | 上海交通大学 | Quenching partition integral treatment method in steel drop stamping and mold |
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