Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel

A technology for automobile girders and coated steel, which is applied in the field of 500MPa grade automotive girder coated steel and its ultra-fast cold production, can solve the problems of high cost and high alloy content in steel design, and achieve improved dent resistance, good surface quality, and coating Effect of Adhesion Improvement

Active Publication Date: 2015-11-25
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This document is a conventional laminar flow cooling method adopted after hot rolling, which has the problems of high alloy content and high cost in steel design

Method used

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  • Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel
  • Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel
  • Coated steel used for 500 MPa grade automobile girder and ultrafast-cooling production method of coated steel

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Embodiment Construction

[0031] The present invention is described in detail below:

[0032] Table 1 is a list of values ​​of various embodiments of the present invention;

[0033] Table 2 is the list of main process parameters of each embodiment of the present invention;

[0034] Table 3 is a list of performance testing conditions of each embodiment of the present invention.

[0035] Each embodiment of the present invention is produced according to the following steps:

[0036] 1) After smelting in the converter, enter the argon station to blow argon, and routinely add aluminum lines to deoxidize and adjust the composition; control the time of argon blowing: the bottom blowing is not less than 4 minutes, and the top blowing is not less than 5 minutes;

[0037] 2) After tapping and continuous casting, the billet is heated, and the heating temperature is controlled at 1280~1310°C, and the heating time is 30~40min;

[0038] 3) Carry out segmental hot rolling, and control the end temperature of rough ...

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Abstract

Coated steel used for a 500 MPa grade automobile girder comprises, by weight, 0.06-0.09% of C, not more than 0.025% of Si, 1.10%-1.29% of Mn, not more than 0.015% of P, not more than 0.006% of S, 0.020%-0.060% of Als and 0.025%-0.034% of Nb. The production method includes the steps that argon blowing is conducted in an argon station after converter smelting is conducted; casting blanks are heated after tapping is conducted and the blanks are formed through continuous casting; staged hot rolling is conducted; laminar cooling is conducted in a variable-speed cooling manner; reeling is conducted; and finishing and subsequence procedures are conducted. Under the design of low alloy components, ultrafast cooling and staged cooling are adopted, the produced coated steel used for the girder has excellent surface quality and platability, hot galvanizing production can be directly conducted, the denting resistance and coating adhesive force of steel plates are further improved, and good surface quality is achieved.

Description

technical field [0001] The invention relates to a steel for automobiles and a production method thereof, in particular to a 500MPa grade coated steel for automobile girders and an ultra-fast cooling production method thereof. Background technique [0002] Hot-rolled steel for coating is widely used in automobile beams that require high surface quality. The surface of hot-dip galvanized steel sheet has the characteristics of bright coating, uniform color, good durability and aesthetics; at the same time, parts such as automobile beams also require good dent resistance and high yield ratio. [0003] At present, the steel beams of its automobiles are still of Q345, Q235 and other steel grades, and then hot-dip galvanized layer on the surface of such steel grades. Due to the continuous development of the automobile industry, it can no longer meet the requirements of manufacturing high-strength automobile structural parts and their surface hot-dip galvanizing. For this reason, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21D8/02
Inventor 刘斌刘永前王立新贺啸秋赵江涛王孟杨海林彭涛
Owner 武汉钢铁有限公司
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