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A kind of coated steel for 460mpa grade automobile frame and its ultra-fast cooling production method

A technology for automobile girders and coated steels, applied in the field of 460MPa-level coated steels for automobile girders and its ultra-fast cold production, can solve the problems of high alloy content and high cost in steel design, achieve good surface quality, improve dent resistance, and excellent Effect of Surface Quality and Platability

Active Publication Date: 2017-03-08
武汉钢铁有限公司
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  • 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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  • A kind of coated steel for 460mpa grade automobile frame and its ultra-fast cooling production method
  • A kind of coated steel for 460mpa grade automobile frame and its ultra-fast cooling production method
  • A kind of coated steel for 460mpa grade automobile frame and its ultra-fast cooling production method

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Embodiment Construction

[0031] The present invention will be described in detail below:

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

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

[0034] Table 3 is a list of performance detection conditions of various embodiments of the present invention.

[0035] The embodiments of the present invention are produced according to the following steps:

[0036] 1) After smelting in the converter, enter the argon station to blow argon, and routinely deoxidize and adjust the composition of the aluminum line; control the argon blowing time: bottom blowing no less than 4min, top blowing no less than 5min;

[0037] 2) After tapping and continuous casting, the slab is heated, the heating temperature is controlled at 1265~1300℃, and the heating is 30~40min;

[0038] 3) Carry out segmented hot rolling, and control the finishing temperature of rough rolling at 1070~1100℃, and control the finish...

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Abstract

460 MPa coating steel for an automobile beam comprises, by weight, 0.06%-0.09% of C, 0.027% or less of Si, 1.00%-1.20% of Mn, 0.015% or less of P, 0.008% or less of S, 0.020%-0.060% of Als and 0.020%-0.030% of Nb. A production method includes the production steps that the chemical components are smelted through a converter and enter an argon station for argon blowing; tapping and continuous casting are conducted to obtain a casting blank, and the casting blank is heated; segmented hot rolling is conducted; laminar cooling is conducted in a variable-speed cooling mode; reeling is conducted; and finishing and subsequent processes are conducted. Under the design of low alloy components, variable-speed cooling and segmented cooling are adopted, on the premise of guaranteeing the mechanical property of a steel plate, the produced beam steel for coatings has excellent surface quality and platability, hot galvanizing production can be directly carried out, and the concavity resistance and coating adhesion of the steel plate are further improved. The surface quality is good.

Description

Technical field [0001] The invention relates to an automobile steel and a production method, in particular to a 460MPa-class coated steel for automobile beams 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, automobile beams and other parts also require steel to have good dent resistance and high yield ratio. [0003] At present, its automobile beam steel is still in Q345, Q235 grade steel, and then hot-dip galvanized layer on the surface of this kind of steel. 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. To this end, steel industry manufacturers ...

Claims

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Application Information

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