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Performance grading control method of ultra-low-carbon cold rolled steel

A technology of grading control and cold-rolled steel, applied in the field of cold-rolled strip production, can solve the problems of complex production organization, low yield and final qualification rate, change rate and high connection billet in the steelmaking process, so as to improve the yield of products. and performance stability

Inactive Publication Date: 2019-12-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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Problems solved by technology

In order to meet the individual needs of users for cold-rolled steel sheets, steel-making enterprises usually need to adjust and design the composition of molten steel at the stage of molten steel smelting, and at the same time cooperate with different subsequent hot-rolling and cold-rolling annealing processes, resulting in complex production organization of the steelmaking process , the conversion rate and connecting billet are high, and the finished product rate and final pass rate are relatively low

Method used

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  • Performance grading control method of ultra-low-carbon cold rolled steel
  • Performance grading control method of ultra-low-carbon cold rolled steel

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Embodiment Construction

[0016] The invention provides a graded control method for ultra-low-carbon cold-rolled steel properties, including the steps of molten steel smelting, hot rolling, cold rolling, and annealing. Grading control is carried out separately, and then ultra-low carbon cold-rolled steel with mechanical properties is obtained.

[0017] The design idea of ​​the chemical composition of the ultra-low carbon cold-rolled steel of the present invention is as follows:

[0018] The weight percentages of the components of the ultra-low carbon cold-rolled steel of the present invention are: C: ≤0.005%, Si: ≤0.03%, Mn: 0.10-0.20%, P: 0.005-0.020%, S: 0.008-0.018%, Ti: 0.055-0.095%, Als: 0.020%-0.070%, and the balance is composed of Fe and unavoidable impurities.

[0019] The choice of carbon content range mainly considers the matching of strength, formability and welding performance. Ultra-low carbon steel is ultra-pure steel, and the lower the carbon content is required, the better.

[0020] S...

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Abstract

The invention relates to a performance grading control method of ultra-low-carbon cold rolled steel and belongs to the technical field of cold rolled plate strip production. The performance grading control method of the ultra-low-carbon cold rolled steel comprises the steps of molten steel smelting, hot rolling, cold rolling and annealing. After molten steel is smelted to obtain a cast blank withfixed components, grading control is carried out on hot rolling, cold rolling and annealing, and then the ultra-low-carbon cold rolled steel with graded mechanical performance is obtained. According to the method, generation of a connecting blank of the ultra-low-carbon steel is effectively reduced, meanwhile, grading control over hot rolling, cold rolling and annealing is simple, and performancegrading of products can be achieved effectively.

Description

technical field [0001] The invention belongs to the technical field of cold-rolled strip production, and in particular relates to a performance classification control method for ultra-low-carbon cold-rolled steel. Background technique [0002] There have been reports on the existing technology of continuous annealing to produce cold-rolled steel sheets, and the representative patents include the following two items. [0003] Patent document CN101514392A discloses a continuous annealing process for deep-drawn and ultra-deep-drawn steel plates. The steel plate is cleaned before annealing and enters the continuous annealing furnace at a speed of 150-350 m / min. Nitrogen-hydrogen mixed gas is used to spray the surface of the steel plate. Protect and prevent oxidation, while heating the steel plate to 120-180°C; heat the steel plate again to 750-780°C, and keep it warm for 40-70s; then cool the steel plate to 400-460°C, and keep it warm 60 ~ 300s for aging treatment, then cooled ...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/04C22C38/02C22C38/06C22C38/14
CPCC21D8/0205C21D8/0226C21D8/0236C21D8/0247C22C38/002C22C38/02C22C38/04C22C38/06C22C38/14
Inventor 王敏莉郑之旺余灿生张功庭
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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