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600MPa grade low temperature high toughness weather corrosion resistant steel and its production method

A technology of atmospheric corrosion-resistant steel and production method, which is applied in the field of low-carbon and low-alloy steel, can solve the problems of high price, high production cost, difficult process control, etc., and achieves reduction of production cost, reduction of steel plate scrap rate, and easy process process. control effect

Inactive Publication Date: 2007-08-08
武钢集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above two atmospheric corrosion-resistant steels are produced by controlled rolling and controlled cooling process, and contain relatively expensive alloy elements V and Mo. The disadvantages are: the process is difficult to control and the production cost is high
Higher production cost due to higher Ni addition

Method used

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  • 600MPa grade low temperature high toughness weather corrosion resistant steel and its production method

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Embodiment Construction

[0036] In the laboratory, 4 furnaces of the present invention were smelted with a 50kg vacuum induction furnace, and the specific chemical compositions of the 4 furnaces of steel are shown in Table 1.

[0037] Through the production method of the present invention:

[0038] The production steps of its specific test:

[0039] 1) Smelting: adopt the smelting process of molten iron desulfurization, dephosphorization, converter top and bottom blowing, Al wire feeding for deoxidation, vacuum treatment after furnace, calcium treatment and fine-tuning of components;

[0040] 2) Carry out blooming: the blooming temperature is controlled at 1180°C;

[0041] 3) Finish rolling: the cumulative reduction rate of the last three passes of finishing rolling is 60%;

[0042] 4) Finish rolling: its temperature is controlled within the range of 850-870 °C;

[0043]5) Cooling: Cool the steel plate to 550-650°C at a cooling rate of 8°C / sec;

[0044] 6) Cool the steel sheet at room temperature ...

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PUM

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Abstract

A steel with high low-temp toughness (600 MPa), weldability and the resistance to atmosphere corrosion contains C (0.05-0.09 wt.%), Si (0.45-0.7), Mn (2.10-3), P (0-0.02), S (0-0.01), Ti (0.005-0.009), Nb (0.095-0.19), Ni (0.1-0.19), Cu (0.45-0.65), Cr (0.75-1.5), Ca (0-0.02) and Fe (rest). It features that Cr+Ni+Cu is 0.70-2.50 and content of Nb is greater than that of 4Ti+3Ca.

Description

1. Technical field [0001] The invention belongs to the field of low-carbon and low-alloy steel, and relates to atmospheric corrosion-resistant steel. 2. Background technology [0002] Steel structures used in atmospheric environments, such as bridges, towers and vehicles, are often subjected to atmospheric corrosion due to the chemical and electrochemical action of oxygen, water and acidic substances in the air, thereby affecting their service life and causing economic losses. . At present, in order to improve the atmospheric corrosion resistance of structural steel, a number of atmospheric corrosion resistant steels or called atmospheric corrosion resistant steels have been developed by various methods at home and abroad. Especially in my country, steel structures such as bridges and towers are mostly made of steel with poor weather resistance. In order to prevent atmospheric corrosion, the surface of the steel structure must be sprayed with anti-corrosion paint from time ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/50C22C33/04C21D8/00C21D6/00
Inventor 陈颜堂郭爱民汪福成丁庆丰李书瑞董汉雄董中波
Owner 武钢集团有限公司
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