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

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

Inactive Publication Date: 2006-01-11
WUHAN IRON & STEEL (GROUP) CORP
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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
  • 600MPa grade low temperature high toughness weather corrosion resistant steel and its production method

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Embodiment Construction

[0037] In the laboratory, 4 furnaces of the present invention were smelted in a 50kg vacuum induction furnace, and the concrete chemical compositions of the 4 furnace steels are shown in Table 1.

[0038] Through the production method described in the present invention:

[0039] The production steps of its specific test:

[0040] 1) Smelting: adopt molten iron desulfurization, dephosphorization technology, converter top-bottom blowing, feed Al wire deoxidation, post-furnace vacuum treatment, calcium treatment and composition fine-tuning smelting process;

[0041] 2) Preliminary rolling: the initial rolling temperature is controlled at 1180°C;

[0042] 3) Carry out finish rolling: the cumulative reduction rate of the last three passes of finish rolling is 60%;

[0043] 4) Final rolling: the temperature is controlled within the range of 850-870°C;

[0044] 5) Cooling: cooling the steel plate to 550-650°C at a cooling rate of 8°C / s;

[0045] 6) Cool the steel plate at room temp...

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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 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 subject to atmospheric corrosion due to the chemical and electrochemical effects 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 batch of atmospheric corrosion resistant steel or atmospheric corrosion resistant steel has 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, it is necessary to spray anti-corrosion coatings on the surface of steel structures from time to time, w...

Claims

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Application Information

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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 WUHAN IRON & STEEL (GROUP) CORP
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