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

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

Inactive Publication Date: 2008-03-19
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

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, re-blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and 1500 wide-band rolling. The operation steps are as follows:

[0037] Molten iron is desulfurized by spraying magnesium particles in the molten iron tank, the sulfur in the molten iron is controlled below 0.020%, the temperature is not lower than 1250°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging material is added 3 minutes before the end point.

[0038]Endpoint control: C: 0.07%, S: 0.020%. 800kg of synthetic slag is added t...

Embodiment 2

[0042] 1. The chemical composition weight percentage of weathering steel is as follows:

[0043] 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.

[0044] 2. The manufacturing method of weathering steel, the production process includes molten iron pretreatment, re-blowing converter smelting, LF ladle refining, soft argon blowing, slab continuous casting, and 1500 wide-band rolling. The operation steps are as follows:

[0045] Molten iron is desulfurized by spraying magnesium particles in the molten iron tank, the sulfur in the molten iron is controlled below 0.02%, the temperature is not lower than 1250°C, and the slag on the surface of the molten iron is removed after desulfurization. The pretreated molten iron enters the converter for smelting, and the slagging material is added 3 minutes before the end point. End point control and other steps are the same as in Example 1.

[0046] The steel...

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PUM

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Abstract

The present invention relates to steel with high intensity and weatherability used for low alloy power rods and the preparation method thereof. The weathering steel has the chemical composition and the weight percentage content that C is 0.06-0.12 percent, Si is 0.15-0.35 percent, Mn is 1.0-1.40 percent, S is less than or equal to 0.030 percent, P is less than or equal to 0.030 percent, Cu is 0.15-0.30 percent, Al is less than 0.04 percent, Nb is 0.01-0.03 percent, and the residual is Fe and microimpurity. The present invention performs combined blown converter smelting, LF ladle refining, soft argon blowing, and sheet billet continuous casting by using the prior equipment and the conventional process production, and performs microalloying treatment through adjusting the content of partial elements. By accurately controlling the processing condition, the economic weathering steel with good atmospheric corrosion resistant performance and comprehensive mechanical performance can be produced.

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 steels, 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 for iron towers in my country were mainly Q235 and Q345, and Q390 was also used in a very small amount. With the development of large-scale and large-scale steel towers, higher-grade high-strength steels such as Q420 have begun to be 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%. Also reduced the main material specifications of the cross arm. Theoretically, the wind pressure of the tower body is reduced due to the reduction of the wind-shielding area of...

Claims

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Application Information

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Patent Type & Authority Applications(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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