CN109930079A - A kind of 980MPa grades of inexpensive cold rolling quenching partition steel and preparation method thereof - Google Patents
A kind of 980MPa grades of inexpensive cold rolling quenching partition steel and preparation method thereof Download PDFInfo
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- CN109930079A CN109930079A CN201910245879.9A CN201910245879A CN109930079A CN 109930079 A CN109930079 A CN 109930079A CN 201910245879 A CN201910245879 A CN 201910245879A CN 109930079 A CN109930079 A CN 109930079A
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Abstract
The present invention provides a kind of 980MPa grades of inexpensive cold rolling quenching partition steel and preparation method thereof, and based on mass fraction, the chemical component of the quenching partition steel is C:0.10~0.30%；Si:1.00~2.20%；Mn:1.50~2.80%；P :≤0.05%；S :≤0.01%；Al :≤0.10%；Surplus is Fe and inevitable field trash.The preparation process flow of the quenching partition steel are as follows: → pickling → cold rolling → continuous annealing → smooth → function inspection → packaging factory is batched in molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling →；The present invention obtains thinner original grain tissue by hot rolling controlled rolling and controlled cooling, using continuous annealing process and Atmosphere Control, guarantees product surface quality, preparation method production control is relatively easy, technological parameter is easily achieved, and product surface quality and mechanical property are good, meets product related request.
Description
Technical field
The present invention relates to a kind of automobile steel and preparation method thereof, specially a kind of 980MPa grades of inexpensive cold rolling quenching is matched
Steel splitting and preparation method thereof.
Background technique
In recent years, the requirement with society to fuel economy and environmental protection is increasingly strong, safety, energy-saving and environmental protection by
Gradually become the hot spot of the numerous worker's researchs of automobile industry, demand of the automobile industry in terms of body lightening and high security is not
Disconnected enhancing, in order to meet the requirement of the energy conservation of automobile loss of weight and collision safety, steel industry have developed it is a series of have it is high-intensitive,
The advanced high-strength steel of the excellent properties such as high impact absorption energy, Q&P (Quenching and Partitioning) steel is in two-phase
The third generation high-strength steel sheet to grow up on the basis of steel, Multiphase Steel and TRIP steel, Q&P steel have while having superhigh intensity
There is good plasticity, can preferably complete loss of weight and the performance optimization of automobile.Q&P steel due to alloy element component demand,
Material cost is higher always.In recent years, as steel industry competition is stronger, the requirement to steel material cost declining is higher and higher,
Therefore it needs ingredient and technique for Q&P steel to carry out continuing to optimize design, while not needing to increase equipment or right as far as possible
Unit carries out large area transformation, and solves the problems, such as to rely between tissue, performance and the technique of alloying metal affect Q&P steel.
Summary of the invention
Technical assignment of the invention is to be directed to the above the deficiencies in the prior art, and provide a kind of 980MPa grades of inexpensive cold rolling
Quenching partition steel and preparation method thereof obtains 980MPa intensity level by formulating Design of Chemical Composition and adjustment heat treatment process
The mechanical property of other Q&P steel.
One aspect of the present invention provides a kind of 980MPa grades of inexpensive cold rolling quenching partition steel, based on mass fraction, chemistry
Ingredient is C:0.10~0.30%；Si:1.00~2.20%；Mn:1.50~2.80%；P :≤0.05%；S :≤0.01%；
Al :≤0.10%；Surplus is Fe and inevitable field trash.
Further, the quenching partition steel, by weight percentage, chemical component is C:0.23~0.24%；
Si:1.34~1.38%；Mn:1.85~1.89%；P :≤0.05%；S :≤0.01%；Al :≤0.10%；Surplus be Fe and
Inevitable field trash.
Another aspect of the present invention provides the preparation method of above-mentioned 980MPa grades inexpensive cold rolling quenching partition steel, technique stream
Journey are as follows: molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → batches → pickling → cold rolling →
Continuous annealing → smooth → function inspection → packaging factory；Including following steps:
Hot rolling slab heating temperature be 1220~1280 DEG C, start rolling temperature be 1080~1120 DEG C, finishing temperature be 880~
920℃；
After rolling use section cooling, cooling rate be 25~35 DEG C/s, coiling temperature be 540~
580℃；The reduction ratio of cold rolling use >=50%；
Wherein, continuous annealing process parameter is as shown in the table:
The present invention obtains thinner original grain tissue by hot rolling controlled rolling and controlled cooling, using continuous annealing process and furnace atmosphere control
System guarantees product surface quality, produces satisfactory quenching partition Q&P steel.
The present invention is accurately controlled by the tissue controlled rolling and controlled cooling to hot rolling raw material with the design of C-Si-Mn ingredient, is avoided crystal grain
Microstructure coarsening obtains thinner original grain tissue, and division technique is matched in the special sudden strain of a muscle of the overaging section after rapid cooling, does not need to add
Add the microalloy elements such as Cr, Mo, Nb, V, Ti and additional quenching apparatus, only can be carried out giving birth in common continuous annealing unit
It produces.So that the retained austenite richness carbon of Q&P steel, retained austenite stabilization is greatly improved, and can be obtained strong compared with the superelevation of high-ductility
Q&P steel, preparation method production control of the present invention is relatively easy, and technological parameter is easily achieved, product surface quality and power
It is good to learn performance, meets product related request.
Detailed description of the invention
The micro-organization chart of the 980MPa grade quenching partition steel of Fig. 1 embodiment of the present invention preparation.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The fixed present invention.
Embodiment 1
A kind of 980MPa grades of inexpensive cold rolling quenching partition steel, by weight percentage, chemical component is C:
0.24%；Si:1.35%；Mn:1.86%；P:0.038%；S:0.005%；Al:0.056%；Surplus is for Fe and unavoidably
Field trash.
The preparation method of above-mentioned 980MPa grades inexpensive cold rolling quenching partition steel, process flow are as follows: molten iron pretreatment →
Converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → batches → and pickling → cold rolling → continuous annealing → smooth →
Function inspection → packaging factory；Including following steps:
Hot rolling slab heating temperature is 1250 DEG C, and start rolling temperature is 1100 DEG C, and finishing temperature is 900 DEG C；Layer is used after rolling
Stream cooling, cooling rate are 30 DEG C/s, and coiling temperature is 560 DEG C；Cold rolling uses 53% reduction ratio；Continuous annealing process parameter
It is as shown in the table:
The mechanical property situation of final products is as shown in the table:
| Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage A50(%) | |
| Standard | 600-850 | ≥980 | ≥15 |
| Embodiment 1 | 661 | 1042 | 18 |
Embodiment 2
A kind of 980MPa grades of inexpensive cold rolling quenching partition steel, by weight percentage, chemical component is C:
0.23%；Si:1.34%；Mn:1.89%；P:0.040%；S:0.008%；Al:0.045%；Surplus is for Fe and unavoidably
Field trash.
The preparation method of above-mentioned 980MPa grades inexpensive cold rolling quenching partition steel, process flow are as follows: molten iron pretreatment →
Converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → batches → and pickling → cold rolling → continuous annealing → smooth →
Function inspection → packaging factory；Including following steps:
Hot rolling slab heating temperature is 1220 DEG C, and start rolling temperature is 1080 DEG C, and finishing temperature is 890 DEG C；Layer is used after rolling
Stream cooling, cooling rate are 25 DEG C/s, and coiling temperature is 550 DEG C；Cold rolling uses 54% reduction ratio；Continuous annealing process parameter
It is as shown in the table:
The mechanical property situation of final products is as shown in the table:
| Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage A50(%) | |
| Standard | 600-850 | ≥980 | ≥15 |
| Embodiment 2 | 682 | 1085 | 19.5 |
Embodiment 3
A kind of 980MPa grades of inexpensive cold rolling quenching partition steel, by weight percentage, chemical component is C:
0.23%；Si:1.38%；Mn:1.85%；P:0.032%；S:0.003%；Al:0.020%；Surplus is for Fe and unavoidably
Field trash.
The preparation method of above-mentioned 980MPa grades inexpensive cold rolling quenching partition steel, process flow are as follows: molten iron pretreatment →
Converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling → batches → and pickling → cold rolling → continuous annealing → smooth →
Function inspection → packaging factory；Including following steps:
Hot rolling slab heating temperature is 1260 DEG C, and start rolling temperature is 1120 DEG C, and finishing temperature is 920 DEG C；Layer is used after rolling
Stream cooling, cooling rate are 35 DEG C/s, and coiling temperature is 580 DEG C；Cold rolling uses 54% reduction ratio；Continuous annealing process parameter
It is as shown in the table:
The mechanical property situation of final products is as shown in the table:
| Yield strength (MPa) | Tensile strength (MPa) | Elongation percentage A50(%) | |
| Standard | 600-850 | ≥980 | ≥15 |
| Embodiment 3 | 658 | 1056 | 20.5 |
Wherein, the microstructure of the 980MPa grade quenching partition steel of preparation of the embodiment of the present invention is as shown in Figure 1.
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright description is applied directly or indirectly in other relevant technology necks
Domain is included within the scope of the present invention.
Claims (4)
1. a kind of 980MPa grades of inexpensive cold rolling quenching partition steel, which is characterized in that based on mass fraction, chemical component is,
C:0.10~0.30%；Si:1.00~2.20%；Mn:1.50~2.80%；P :≤0.05%；S :≤0.01%；Al :≤
0.10%；Surplus is Fe and inevitable field trash.
2. a kind of 980MPa grades according to claim 1 inexpensive cold rolling quenching partition steel, which is characterized in that the quenching
With steel splitting, by weight percentage, chemical component is C:0.23~0.24%；Si:1.34~1.38%；Mn:1.85~
1.89%；P :≤0.05%；S :≤0.01%；Al :≤0.10%；Surplus is Fe and inevitable field trash.
3. a kind of preparation method of 980MPa grades according to claim 1 or 2 inexpensive cold rolling quenching partition steel, technique
Process are as follows: → pickling → cold rolling is batched in molten iron pretreatment → converter smelting → external refining → continuous casting → heating → controlled rolling and controlled cooling →
→ continuous annealing → smooth → function inspection → packaging factory；It is characterized in that, including following steps:
Hot rolling slab heating temperature is 1220~1280 DEG C, and start rolling temperature is 1080~1120 DEG C, and finishing temperature is 880~920
℃；
Section cooling is used after rolling, cooling rate is 25~35 DEG C/s, and coiling temperature is 540~580 DEG C；
The reduction ratio of cold rolling use >=50%.
4. a kind of preparation method of 980MPa grades according to claim 3 inexpensive cold rolling quenching partition steel, feature exist
In wherein continuous annealing process parameter is as shown in the table:
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111139406A (en) * | 2019-12-23 | 2020-05-12 | 兴化市润萍金属制品有限公司 | High-mechanical-strength alloy steel and preparation method thereof |
| CN111139399A (en) * | 2019-12-19 | 2020-05-12 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111455266A (en) * | 2020-02-17 | 2020-07-28 | 本钢板材股份有限公司 | 980 MPa-grade low-yield cold-rolled dual-phase steel and preparation method thereof |
| CN113718168A (en) * | 2020-05-25 | 2021-11-30 | 宝山钢铁股份有限公司 | High-strength cold-rolled steel plate and manufacturing method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111139399A (en) * | 2019-12-19 | 2020-05-12 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111139399B (en) * | 2019-12-19 | 2021-08-13 | 唐山不锈钢有限责任公司 | High-silicon wear-resistant steel NM360 hot-rolled steel strip and production method thereof |
| CN111139406A (en) * | 2019-12-23 | 2020-05-12 | 兴化市润萍金属制品有限公司 | High-mechanical-strength alloy steel and preparation method thereof |
| CN111455266A (en) * | 2020-02-17 | 2020-07-28 | 本钢板材股份有限公司 | 980 MPa-grade low-yield cold-rolled dual-phase steel and preparation method thereof |
| CN113718168A (en) * | 2020-05-25 | 2021-11-30 | 宝山钢铁股份有限公司 | High-strength cold-rolled steel plate and manufacturing method thereof |
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Application publication date: 20190625 |