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Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof

A yield strength, cold-rolled steel plate technology, used in bell-type furnaces, lighting and heating equipment, etc., can solve the problems of difficulty in achieving stable control and increase in cost, and achieve low cost, low annealing temperature, and high technology. simple effect

Active Publication Date: 2013-02-13
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the use of dual-phase steel structure, the cost increases greatly, and it is difficult to achieve stable control
[0011] The above two types of patents represent two basic ideas for realizing high-strength cold-rolled steel at present, and there is a coordination problem between strength, cost and stability

Method used

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  • Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof
  • Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof
  • Cold-rolled steel sheet with yield strength of 980 MPa grade and manufacturing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment l

[0061] The chemical composition of the cold-rolled steel plate designed in this embodiment is by weight percentage: C: 0.09%, Si: 0.25%, Mn: 1.9%, Nb: 0.035%; Ti: 0.15%; Cr: 0.8%; P: 0.008% ;S: 0.001%; ​​N: 0.0051%; O: 0.0038%; Alt: 0.036%; the rest are iron Fe and unavoidable impurities. According to the above composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti, and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1210mm×11800mm, and the continuous casting slab is heated to 1250°C , the heating time is 160 minutes, rolled on a hot continuous rolling mill, the rough rolling start temperature is controlled at 1150°C, the rough rolling finish rolling temperature is controlled at 1050°C, the rough rolling is 5 passes, the thickness of the intermediate billet is 30mm, and the finish rolling is started. The temperature is controlled at 1020°C, the finish rolling temperature is controlled...

Embodiment 2

[0066] The chemical composition of the cold-rolled steel plate designed in this embodiment is: C: 0.1%, Si: 0.28%, Mn: 1.8%, Nb: 0.06%; Ti: 0.14%; Cr: 1.0%; P: 0.009% ; S: 0.003%; N: 0.0045%; O: 0.0036%; Alt: 0.032%; the rest are iron Fe and unavoidable impurities.

[0067] According to the above composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti, and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1230mm×11800mm, and the continuous casting slab is heated to 1260°C , the heating time is 172 minutes, the rough rolling start temperature is controlled at 1190°C, the rough rolling finish temperature is controlled at 1040°C, the rough rolling is carried out for 5 passes, and the thickness of the intermediate billet is 35mm. The control is 1000°C, the finish rolling temperature is controlled at 850°C, 5 passes of finish rolling, the average reduction of each pass of finish rolling is co...

Embodiment 3

[0072] The chemical composition of the cold-rolled steel plate designed in this embodiment is: C: 0.09%, Si: 0.18%, Mn: 1.85%, Nb: 0.055%; Ti: 0.16%; Cr: 0.9%; P: 0.01% ; S: 0.004%; N: 0.0041%; O: 0.0033%; Alt: 0.030%; the rest are iron Fe and unavoidable impurities.

[0073] According to the above composition design, the raw materials are smelted on a 120-ton converter, and alloyed with Nb, Ti, and Cr during the refining process, and then continuously cast into a continuous casting slab of 175mm×1230mm×11800mm, and the continuous casting slab is heated to 1270°C , the heating time is 165 minutes, the rough rolling start temperature is controlled at 1180°C, the rough rolling finish temperature is controlled at 1040°C, the rough rolling is carried out for 5 passes, and the thickness of the intermediate billet is 33mm. The control is 1000°C, the finish rolling temperature is controlled at 850°C, there are 5 passes of finish rolling, the average reduction of each pass of finish r...

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Abstract

The invention discloses a cold-rolled steel sheet with yield strength of 980 MPa grade, and belongs to the technical field of cold-rolled high strength steel. The steel sheet comprises the following chemical components in percentage by weight: 0.08-0.13% of C, 0.05-0.5% of Si, 1.2-2.0% of Mn, less than or equal to 0.010% of P, less than or equal to 0.005% of S, 0.6-1.5% of Cr, 0.08-0.20% of Ti, 0.02-0.08% of Nb, 0.04-0.2% of V, one or more of Nb, V and Ti, 0.02-0.1% of Alt, less than or equal to 0.006% of N, less than or equal to 0.004% of O, and the balance of Fe and unavoidable impurities. The tensile strength of the steel sheet is more than 980 MPa, therefore, the steel sheet is excellent in plasticity and forming performance. The manufacturing method of the steel sheet is a low-cost cold-rolled annealed steel sheet manufacturing method, and can be implemented on common reversing cold rolling mills and cover annealing devices.

Description

technical field [0001] The invention relates to a cold-rolled steel plate with a yield strength of 980MPa and a manufacturing method thereof, which adopts bell annealing treatment and belongs to the technical field of cold-rolled high-strength steel production. Background technique [0002] With the continuous improvement of automobile safety, environmental protection, energy saving, and weight reduction requirements, advanced high-strength steel is widely used in the automotive field. In automobile manufacturing enterprises, the use of high-strength steel is gradually increasing. It is mainly used to manufacture automobile body, automobile floor and high-strength structural parts, etc., which can greatly reduce the weight of the automobile, and is also related to the stability of the vehicle structure. Performance, impact resistance and service life, the use requirements and conditions are very harsh. The requirements for the use of such materials are mainly the high stren...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C22C38/26C22C38/24C21D8/02C21D1/26C21D9/663
Inventor 赵培林孙建卫王涛蔡朝华陈学涛杨立威商玉华张桂南张佩路峰张明金尹翠兰杨旭王孝科
Owner LAIWU IRON & STEEL GRP
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