Steel for high-strength weather-proof low-alloy electric force bar and preparing method thereof

A low-alloy steel and high-strength technology, applied in temperature control, etc., can solve the problems of poor welding performance, high cold crack index, and high carbon equivalent of steel, and achieve the effects of easy and stable control, low cost, and low carbon equivalent

Inactive Publication Date: 2009-09-09
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are several problems in this invention: the carbon equivalent of the steel is relatively high, the cold crack index is relatively high, the welding performance is not very good, and the composition range is very wide

Method used

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  • Steel for high-strength weather-proof low-alloy electric force bar and preparing method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. The chemical composition weight percentage of weathering steel is as follows:

[0035] C: 0.07%, Si: 0.25%, Mn: 1.25%, S: 0.012%, P: 0.015%, Cu: 0.23%, Al: 0.024%, Nb: 0.021%, and the rest are Fe and trace impurities.

[0036] 2. The manufacturing method of weathering steel, the production process includes molten iron pretreatment, compound blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and 1500 wide band rolling. The operation steps are as follows:

[0037]The molten iron is desulfurized by spraying magnesium particles in the molten iron tank. The sulfur in the molten iron is controlled below 0.020%, and the temperature is not lower than 1250 ° C. After the desulfurization is completed, the slag on the surface of the molten iron is removed. The pretreated molten iron enters the converter for smelting, and the slag-forming material is added 3 minutes before the end point. Endpoint control: C: 0.07%, S: 0.020%. Before ta...

Embodiment 2

[0041] 1. The chemical composition weight percentage of weathering steel is as follows:

[0042] C: 0.08%, Si: 0.22%, Mn: 1.21%, S: 0.010%, P: 0.012%, Cu: 0.25%, Al: 0.034%, Nb: 0.025%, and the rest are Fe and trace impurities.

[0043] 2. The manufacturing method of weathering steel, the production process includes molten iron pretreatment, compound blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and 1500 wide band rolling. The operation steps are as follows:

[0044] The molten iron is desulfurized by spraying magnesium particles in the molten iron tank. The sulfur in the molten iron is controlled below 0.02%, and the temperature is not lower than 1250 °C. After the desulfurization is completed, the slag on the surface of the molten iron is removed. The pretreated molten iron enters the converter for smelting, and the slag-forming material is added 3 minutes before the end point. End-point control and other steps and processes ar...

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Abstract

The invention relates to a high-strength weather-resistant low-alloy steel for power poles and a preparation method thereof. The chemical composition and weight percentage of the weathering steel are: C: 0.06-0.12%, Si: 0.15-0.35%, Mn: 1.0-1.40%, S≤0.030%, P≤0.030%, Cu: 0.15-0.30%, Al<0.04%, Nb: 0.01~0.03%, the rest is Fe and trace impurities. The present invention utilizes the existing equipment and the conventional process to produce through re-blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and carries out micro-alloying treatment by adjusting the content of some elements. By accurately controlling the rolling process conditions, it is possible to produce economical weathering steel with good atmospheric corrosion resistance and comprehensive mechanical properties.

Description

technical field [0001] The invention relates to a high-strength weather-resistant low-alloy steel and a preparation method thereof, belonging to the field of low-alloy steel, in particular to an economical high-strength weather-resistant low-alloy power pole steel and a preparation method thereof. Background technique [0002] In the past, the strength grades of steel used in iron towers in my country were mainly Q235 and Q345, and Q390 was used in a very small amount. With the development of large-load and large-scale iron towers, higher-grade high-strength steels such as Q420 have been used in China. In contrast, Q420 has obvious economic and technological advantages. If Q420 is used as the main material of the iron tower, it can not only reduce the weight of the tower by 6% to 8%. It also reduces the size of the main material of the cross arm. Theoretically, the wind pressure of the tower body is reduced due to the reduction of the windshield area of ​​the tower body; f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/16C22C33/04C21C7/00B21B37/74B21C47/02B22D11/16C21D8/00
Inventor 王建景汤化胜周平张桂南王学新王腾飞李灿明李全君
Owner LAIWU IRON & STEEL GRP
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