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Batch annealing interstitial-free (IF) steel and production method thereof

A bell annealing and production method technology, applied in the field of steel rolling, can solve the problem of poor resistance to secondary processing brittleness, achieve the effect of improving the distribution of grain boundaries and improving the performance of secondary processing brittle resistance

Active Publication Date: 2012-10-24
SHOUGANG CORPORATION
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Problems solved by technology

[0004] The object of the present invention is to solve the problem that the secondary processing brittleness of the existing bell annealed IF steel is poor, and provide a bell annealed IF steel capable of improving the secondary processing brittleness of the bell annealed IF steel and its production method

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  • Batch annealing interstitial-free (IF) steel and production method thereof

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Embodiment Construction

[0025] The object of the present invention is to provide a method for producing bell annealed IF steel with excellent secondary processing brittleness, through appropriate composition design, and adopting the process optimization method of strain recrystallization after the bell is retreated, the quality of bell annealed IF steel can be improved. The distribution of grain boundaries can reduce the ductile-brittle transition temperature (DBTT) of bell-annealed IF steel to below -60°C, thereby improving the secondary processing brittleness resistance of bell-annealed IF steel.

[0026] In order to achieve the above purpose, the present invention provides a bell-type annealed IF steel, the mass percentage of its chemical composition is: C: 0.0005~0.0035, Si≤0.03, Mn: 0.05~0.30, P≤0.008, S≤0.012, N≤ 0.004, Al: 0.02~0.07, Ti: 0.04~0.09, Nb: 0.003~0.015, B: 0.0003~0.0020 and the balance is Fe and other unavoidable trace elements.

[0027] Among them, C is a strengthening element. A ...

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Abstract

The invention discloses batch annealing interstitial-free (IF) steel. The steel comprises, by mass, 0.0005-0.0035 of carbon, no more than 0.03 of silicon, 0.05-0.30 of manganese, no more than 0.008 of phosphorus, no more than 0.012 of sulphur, no more than 0.004 of nitrogen, 0.02-0.07 of aluminum, 0.04-0.09 of titanium, 0.003-0.015 of niobium, 0.0003-0.0020 of barium and the balance ferrum and trace elements. The invention also discloses a production method of the IF steel. By the aid of the steel and the method, the component design is proper, a process optimization method in which the batch is retreated and the stress and the recrystallization are performed is used, the crystal boundary distribution condition of the IF steel is improved, the ductile-brittle transition temperature (DBTT) of the IF steel is lowered to below -60 DEG C, the secondary-processing brittle resistant performance of the IF steel is improved, and automatic industry requirements are met well.

Description

technical field [0001] The invention belongs to the technical field of steel rolling, and in particular relates to a bell-type annealed IF steel and a production method thereof. Background technique [0002] IF steel has excellent ultra-deep drawability and non-aging properties. It is the third generation of stamping steel and is widely used in the manufacture of automobiles, home appliances and daily necessities. IF steel is usually produced by continuous annealing and bell annealing methods. Among them, the production of IF steel by bell annealing has the advantages of less equipment investment, no specification restrictions and flexible production. However, due to the existence of grain boundary distribution defects, bell annealed IF steel has poor secondary processing brittleness, and its ductile-brittle transition temperature (DBTT) is usually above -40°C, which limits the development of bell annealed IF steel. application range. [0003] This patent proposes based on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/14C21D8/04
Inventor 梁轩崔阳朱立新李向阳阳代军刘再旺赵运堂黄学启黄来情王勇围陈兆阳
Owner SHOUGANG CORPORATION
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