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High-strength Q420C level steel tower corner iron and production process

A technology of iron tower angle steel and production process, which is applied in the field of iron and steel smelting. It can solve the problems of many inclusions and the 0°C impact energy of angle steel cannot meet the standard requirements, and achieve the effects of solving nodules, reducing the number of pearlite, and reducing costs.

Inactive Publication Date: 2009-08-19
HEBEI IRON AND STEEL
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Problems solved by technology

At present, the urgent problem to be solved in the production of Q420C grade angle steel is that there are many kinds of inclusions in the molten steel, and the impact energy of the angle steel at 0°C cannot meet the standard requirements.

Method used

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  • High-strength Q420C level steel tower corner iron and production process

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Embodiment Construction

[0017] Main feature of the present invention is embodied in following three aspects:

[0018] 1. In order to improve the impact performance and ensure the weldability, the composition ratio breaks through the standards of "GB / T1591-1994 Low Alloy High Strength Structural Steel" and "YBT4163-2007 Hot Rolled Angle Steel for Iron Tower", and gives the carbon equivalent Require.

[0019] 2. The steelmaking process adopts VN alloy with vanadium, replaces the conventional vanadium microalloying with vanadium nitrogen microalloying, and adds Ti to VN steel. Generally speaking, N is a harmful element in steel. In the metallurgical production process of iron and steel materials, it is difficult to remove it unless a very high-cost refining method is used. For ordinary steel structural materials, the accumulation of nitrogen elements in structural defects such as grain boundaries will cause aging phenomena, which will increase the strength of the steel and decrease the toughness. The ...

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Abstract

The invention relates to a high tensile Q420C level angle iron applied to pylons and a manufacturing technique thereof, belonging to the technical field of steel making and aiming at improving 0 DEG C ballistic work of the angle iron applied to power system pylons. The angle iron is characterized in that mixture ratio of chemical compositions thereof is as follows: C: 0.01-0.16%, Mn: 1.15-1.45%, Si: 0.30-0.50%, S, P: less than or equal to 0.025%, V: 0.070-0.100%, Ti: 0.004-0.010%, and the balance of Fe and Ceq: less than or equal to 0.42%. In the manufacturing technique of the invention, VN microalloying mode of production is applied to steel making, ferrotitanium is added after deoxidation and alloying, Ca wire is fed to bale liquid steel prior to continuous casting and controlled rolling and cooling is carried out in the rolling process. Measurement indicators show that the steel of the invention meet the requirements for high strength, high impact ductility and 0 DEG C impact ductility; applied to manufacturing of power transmission and transformation pylons, the angle iron of the invention, while not reducing self weight of the pylons, improves safety factor of the pylons when being used in a low temperature environment.

Description

technical field [0001] The invention relates to an angle steel and a production process, in particular to a high-strength Q420C iron tower angle steel and a production process, and belongs to the technical field of iron and steel smelting. Background technique [0002] In recent years, with the rapid development of the economy, the demand for electricity in various industries has increased day by day, which has brought about a peak in steel structure materials for power transmission and transformation towers and substations. The State Grid Corporation regards the upgrading of the strength of the iron tower as an important measure to promote the scientific and technological progress of power transmission and transformation projects and reduce costs, and clearly proposes that Q420B or higher angle steel should be used when promoting the application of high-strength steel for iron towers in the future. In this regard, relevant iron and steel enterprises continue to research and...

Claims

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Application Information

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IPC IPC(8): C22C38/14C22C33/06C21C7/072
Inventor 李建新齐长发陈春生王云阁孔庆福周研冯润明张海芹杨树鹏李德洪
Owner HEBEI IRON AND STEEL
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