Small-scale finish-rolled twisted steel and production method thereof

A technology of finishing thread and production method, which is applied in the manufacture of converters, etc., can solve the problems of insufficient self-tempering, complex process, and large fluctuations in product performance, and achieve improved precipitation strengthening effect, simple process, and microalloy distribution. uniform effect

Active Publication Date: 2015-02-04
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method also has many deficiencies, such as complicated procedures and maintenance of multiple water tank equipment
Multi-line online cooling cannot give full play to the function of self-tempering, resulting in large fluctuations in product performance

Method used

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  • Small-scale finish-rolled twisted steel and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare a finish-rolled rebar with a diameter of 18mm. According to the steel composition requirements, the chemical composition of molten steel is: C: 0.45%, Si: 1.67%, Mn: 0.86%, P: 0.034%, S: 0.027%, V: 0.083 %, Als: 0.0081%;

[0027] Its preparation method comprises the following steps in turn:

[0028] It includes the steps of molten iron desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling.

[0029] (1) Desulfurization of the molten iron, controlling the sulfur content of the molten iron leaving the station S≤0.030%;

[0030] (2) Converter top-bottom blowing, the amount of steel scrap charged accounts for 10% of the total charge; the converter adopts top-bottom combined blowing, the end point adopts high-drawing supplementary blowing process, and the number of point blowing times is ≤ 2 times; the final slag alkalinity The target is 2.88; the control target o...

Embodiment 2

[0038] Prepare a finish-rolled rebar with a diameter of 18mm. According to the steel composition requirements, the chemical composition of molten steel is: C: 0.40%, Si: 1.8%, Mn: 0.92%, P: 0.027%, S: 0.021%, V: 0.94 %, Als: 0.008%;

[0039] Its preparation method comprises the following steps in turn:

[0040] It includes the steps of molten iron desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling, and is characterized in that:

[0041] (1) Desulfurization of the molten iron, controlling the sulfur content of the molten iron leaving the station S≤0.030%;

[0042] (2) Converter top-bottom blowing, the amount of steel scrap charged accounts for 13% of the total charge; the converter adopts top-bottom compound blowing, the end point adopts high-drawing supplementary blowing process, and the number of point blowing times is ≤ 2 times; the final slag alkalinity The target is...

Embodiment 3

[0050] Prepare a finish-rolled threaded steel bar with a diameter of 25mm. According to the steel composition requirements, the chemical composition of molten steel is: C: 0.42%, Si: 1.5%, Mn: 0.96%, P: 0.021%, S: 0.020%, V: 0.117 %, Als0.009%;

[0051] Its preparation method comprises the following steps in turn:

[0052] It includes the steps of molten iron desulfurization, converter smelting, argon blowing, continuous casting, billet heating, rolling, post-rolling controlled cooling, and cooling bed air cooling, and is characterized in that:

[0053] (1) Desulfurization of the molten iron, controlling the sulfur content of the molten iron leaving the station S≤0.020%;

[0054] (2) Converter top-bottom blowing, the amount of steel scrap charged accounts for 15% of the total charge; the converter adopts top-bottom compound blowing, the end point adopts high-drawing supplementary blowing process, and the number of point blowing times is ≤ 2 times; the final slag alkalinity T...

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Abstract

The invention provides small-scale finish-rolled twisted steel and a production method thereof. The small-scale finish-rolled twisted steel comprises the following chemical components in percentage by mass: 0.40-0.50% of C, 1.5-1.8% of Si, 0.8-1.0% of Mn, less than or equal to 0.035% of P, less than or equal to 0.035% of S, 0.08-0.13% of V, 0.008-0.01% of Als and the balance of Fe and inevitable impurities. The production method comprises the following steps: desulfurizing molten iron, smelting in a converter, blowing argon, performing protective casting into a square blank of 200*200mm<2>, heating the square blank, rolling, performing controlled cooling after rolling, and performing air-cooling in a cooling bed. The finish-rolled twisted steel provided by the invention is stable in property, and the production method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of steel bar smelting, and specifically refers to a small-sized precision-rolled threaded steel bar and a production method thereof. Background technique [0002] Finished threaded steel bars are also called prestressed concrete threaded steel bars. Our country began to develop and produce them in the 1980s. In 2005, the National Standardization Management Committee approved and issued the GB / T 20065-2006 "Prestressed Concrete Threaded Steel Bars" standard. Finish-rolled rebar is a high-strength, high-precision straight steel bar with external threads rolled on the entire steel bar. Any cross-section of the whole steel bar can be screwed with a connector with internal thread for connection, or screwed with a threaded cap for anchoring. It has the advantages of simple connection and anchoring, strong adhesion, and convenient construction, and because it saves the welding process. , to avoid fractures caused by interna...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/12C22C33/04C21C5/35C21D8/08
CPCC21C5/35C21D8/08C22C38/02C22C38/04C22C38/06C22C38/12
Inventor 徐志东徐志龙莉范植金吴杰朱启铭周新龙
Owner 武汉钢铁有限公司
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