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A kind of cold-rolled steel plate and preparation method thereof

A cold-rolled steel plate and slab technology, applied in the field of cold-rolled steel plate and its preparation, to achieve the effect of good market prospects

Inactive Publication Date: 2016-01-20
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the stamping performance of the steel plate obtained by this process needs to be further improved

Method used

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  • A kind of cold-rolled steel plate and preparation method thereof
  • A kind of cold-rolled steel plate and preparation method thereof
  • A kind of cold-rolled steel plate and preparation method thereof

Examples

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preparation example Construction

[0024] The present invention provides a method for preparing cold-rolled steel plates, the method comprising: sequentially hot-rolling, coiling, cold-rolling, annealing, skin-passing and tension-leveling of the slab, wherein, after the hot-rolling and after the Before coiling, the intermediate slab obtained after hot rolling is cooled to 780-820°C at a cooling rate of 70-90°C / s, and then cooled to the coiling temperature at a cooling rate of 15-25°C / s; The coiling temperature is 730-770°C; the reduction ratio of the cold rolling is 75-85%; the annealing method is continuous annealing, and during the annealing process, the intermediate plate obtained after cold rolling The slab sequentially passes through a heating section, a soaking section, a primary cooling section, a low temperature maintenance section, an overaging section, and a secondary cooling section. The terminal temperatures in the primary cooling section, the low temperature maintenance section, the overaging secti...

Embodiment 1-3

[0056] This example is used to illustrate the cold-rolled steel sheet of the present invention and its preparation method.

[0057] 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 starting rolling temperature of rough rolling and enters the reversible rough rolling unit. After rough rolling, the intermediate billet enters the hot coil box, and the strip head and tail are exchanged, and then the finish rolling is carried out. After finishing rolling, cooling is carried out twice, that is, the intermediate slab obtained after hot rolling is rapidly cooled to cooling temperature A (abbreviated as cold temperature A in Table 2) at cooling rate A (abbreviated as cold A in Table 2) Afterwards, be cooled to the temperature of coiling with coolin...

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Abstract

The invention discloses a cold-rolled steel plate and a making method thereof. The method includes the steps of hot rolling of a plate blank, reeling, cold rolling, annealing, polishing and straightening. The method characterized in that the intermediate plate blank obtained after the hot rolling is cooled at a cooling speed of 70-90DEG C / s to 780-820DEG C and then is cooled at a cooling speed of 15-25DEG / s to a reeling temperature after the hot rolling and before reeling; the reeling temperature is 730-770DEG C; the reduction rate of the cold rolling is 75-85%; and the annealing mode is continuous annealing, and an intermediate plate blank obtained after cold rolling sequentially goes through a heating section, a soaking section, a primary cooling section, a low temperature holding section, an over-ageing section and a secondary cooling section in the annealing process. The cold-rolled steel plate with the yield strength of 140-180MPa, excellent formability and high plastic strain ratio can be obtained through the method.

Description

technical field [0001] The invention relates to a cold-rolled steel plate and a preparation method thereof. Background technique [0002] With the continuous development of the automobile industry, the market's requirements for automobile steel plates continue to increase. In order to meet the forming requirements of deep drawing in the market, especially to meet the overall stamping and forming parts in the field of automobiles and motorcycles (such as connecting the right longitudinal beam of automobiles) plate) requires a steel plate with a certain yield strength and excellent stamping performance. [0003] Currently, CN101514392A discloses a continuous annealing process for deep-drawn and ultra-deep-drawn steel sheets as a method for preparing extra-ultra-deep-drawn cold-rolled steel sheets. The process includes: the steel plate is cleaned before annealing, enters the continuous annealing furnace at a speed of 150-350m / min, sprays the surface of the steel plate with nit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/14C21D8/02
Inventor 王敏莉郑之旺梁英肖利余灿生付佑春郑建华
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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