Process for producing British standard 460 grade thread reinforcing steel by ordinary carbon steel

A technology of threaded steel bar and process method, which is applied in the direction of manufacturing tools, roll speed control, heat treatment equipment, etc., can solve the problems of large consumption of steel resources, increase the weight of buildings, and increase the amount of steel bars, so as to reduce the amount of steel and save steel resources. , the effect of reducing the dosage

Inactive Publication Date: 2006-06-28
双菱钢铁集团控股有限公司
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Problems solved by technology

In addition, many manufacturers realize the production of high-strength rebar by adding alloy elements V, Nb and Ti, which undoubtedly increases the production cos

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  • Process for producing British standard 460 grade thread reinforcing steel by ordinary carbon steel

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[0019] figure 1 Shown is an embodiment of the process method for producing British Standard 460 rebar by using ordinary carbon steel according to the present invention, which includes the following steps:

[0020] a. Use ordinary carbon steel, such as ordinary carbon steel Q235 grade C and D steel grades, the content of C element is 0.17 to 0.22%, and the content of Mn element is 0.35 to 0.8%. After the billet is heated out of the furnace, the start-rolling temperature is maintained at 900~980℃. After the roughing and intermediate rolling mills (rough rolling 7, intermediate rolling 6), the maximum elongation coefficient μ of the rolling mill is 1.449, and then the steel is cooled by pre-crossing water cooling. According to various rolling specifications, the number of sections of the pre-penetrating water section is 1 to 3, the water pressure is 0.5-0.8Mpa (see Table 1), and the temperature of the steel pre-penetrating the water is 850-950°C;

[0021] b. After the steel passes t...

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Abstract

The invention discloses a technology method used common carbon steel to manufacture mark 460 grade deformed bar. It includes the following steps: adopting common carbon steel; start rolling temperature is ultra-low temperature with 900-980 centigrade degree; pressing; rolling mill maximum elongation coefficient u is 1.449; cooling by pre-passing water segment; its number is 1-3; water pressure is 0.5-0.8Mpa; the cooled temperature is 850-950 centigrade degree; entering fining mill group; main electric machine power is 1350KW; cooling by water passing cooling segment; its number is 2-5; water pressure is 0.8-2.0Mpa; the temperature of cooling bed surface is 580-650 centigrade degree; air cooling; and finishing self tempering. The invention adopts common carbon steel and ultra-low temperature big pressure rolling to reduce production cost, increase corrugated steel bar strength, and economize steel resources.

Description

technical field [0001] The invention relates to a production process method of steel bar, in particular to a production process method of British standard 460 grade threaded steel bar. Background technique [0002] Using the current production process method, if ordinary carbon billet is used to roll the British standard 460 threaded steel bar, when the steel bar is connected by welding, the strength of the steel bar will decrease after the steel bar at the welding joint is heated to high temperature. Therefore, the high-strength steel bars exported by domestic manufacturers are all produced with 20MnSi billets. In addition, many manufacturers realize the production of high-strength rebar by adding alloy elements V, Nb and Ti, which undoubtedly increases the production cost. In addition, it also increases the amount of steel bars used in buildings, and consumes a lot of steel resources, which in turn increases the weight of buildings. Contents of the invention [0003] T...

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Application Information

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IPC IPC(8): C21D8/06B21B37/46B21B37/74C21D11/00
Inventor 丁之坤吴少文康胜利朱席龙李金鸿
Owner 双菱钢铁集团控股有限公司
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