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Ultra-low carbon cold-roll steel sheet and preparation method thereof

A cold-rolled steel plate and ultra-low-carbon technology, which is applied in the field of ultra-low-carbon cold-rolled steel plate and its preparation, can solve the problem of insufficient baking hardening value of the steel plate, and achieve good market prospects, low strength in the forming process, and increased strength

Active Publication Date: 2014-08-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the defect that the bake hardening value of the steel plate obtained by the existing ultra-low carbon cold-rolled steel plate preparation method is not high enough, and to provide a method for preparing an ultra-low carbon cold-rolled steel plate with excellent bake hardening performance and The cold-rolled steel plate prepared by it

Method used

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  • Ultra-low carbon cold-roll steel sheet and preparation method thereof
  • Ultra-low carbon cold-roll steel sheet and preparation method thereof
  • Ultra-low carbon cold-roll steel sheet and preparation method thereof

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preparation example Construction

[0026] The present invention provides a preparation method of ultra-low carbon cold-rolled steel plate (hereinafter sometimes only referred to as cold-rolled steel plate). The method comprises: hot rolling, coiling, cold rolling, annealing, skin pass and drawing Straightening, wherein, after hot rolling and before coiling, the intermediate slab obtained after hot rolling is cooled to 780-820°C at a cooling rate of 70-95°C / s, and then cooled at a cooling rate of 20-30°C / s The cooling rate is cooled to the coiling temperature; the coiling temperature is 650-750°C; the cold rolling reduction is 70-80%; the annealing method is continuous annealing, and during the annealing process Among them, the intermediate slab obtained after cold rolling passes through the heating section, soaking section, primary cooling section, overaging section and secondary cooling section successively, and the intermediate slab obtained after the cold rolling passes through the heating section, the The e...

Embodiment 1-3

[0055] This example is used to illustrate the cold-rolled steel sheet of the present invention and its preparation method.

[0056] The continuous casting slab (thickness: 200mm) of the present invention was obtained by smelting in converter, Ca treatment in LF furnace, RH decarburization and continuous casting, and its composition is shown in Table 1. The continuous casting slab is heated in the heating furnace to the rough rolling opening temperature and enters the reversible rough rolling unit. After rough rolling, the intermediate slab enters the hot coil box, and the strip head and tail are exchanged, and then the finish rolling is carried out. After finishing rolling, it is rapidly cooled to the final cooling temperature according to the specified cooling rate, and then coiled after laminar cooling to the coiling temperature at the layer cooling rate (the hot rolling process and the cooling process are carried out according to the conditions in Table 2). Carry out cold r...

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Abstract

The invention provides an ultra-low carbon cold-roll steel sheet and a preparation method thereof. The preparation method comprises the steps of hot rolling, reeling, cold rolling, annealing, finishing, drawing and straightening a steel sheet blank sequentially, wherein the steel sheet blank comprises the following components by weight percent: 0.001-0.006% of C, 0.01-0.05% of Si, 0.1-0.5% of Mn, less than or equal to 0.015% of P, less than or equal to 0.015% of S, 0.005-0.03% of Nb, 0.01-0.08% of Al, and the balance of iron and inevitable impurities. The preparation method can provide the ultra-low carbon cold-roll steel sheet with good bake hardening performance.

Description

technical field [0001] The invention relates to an ultra-low carbon cold-rolled steel plate and a preparation method thereof. Background technique [0002] With the development of the automobile industry, high-strength and high-formability cold-rolled steel sheets are required in the body. The bake-hardened cold-rolled steel sheets have a strength close to that of mild steel, and exhibit excellent formability during the forming process. The coating and baking treatment increases the yield strength and achieves the matching of formability and high strength. [0003] CN102534370A discloses a high-strength ultra-low carbon bake-hardening steel plate and its manufacturing process. The components and weight percentages of the invention are: C: 0.0010-0.0030%, Si: 0.06-0.12%, Mn: 0.45-0.90%, P: 0.03-0.06%, Al: 0.015-0.045%, Ti: 0.007-0.014%, S≤0.010%, N≤0.003%, and the rest is Fe. The Ti component can also be replaced by 0.013-0.027% Nb component. Its manufacturing process incl...

Claims

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Application Information

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IPC IPC(8): C21D8/02C22C38/12
Inventor 王敏莉郑之旺杜江波张功庭梁英董君寸海红余灿生付佑春于秀
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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