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Production process of rebar for concrete

A production process and concrete technology, applied in the field of production process of steel bars for concrete, can solve the problems of small tensile strength and yield strength, high yield ratio and low yield ratio.

Inactive Publication Date: 2011-05-18
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the yield strength ratio of the steel bar obtained by the traditional quenching and tempering heat treatment process is too high, which can reach 97%, resulting in a small difference between the tensile strength and the yield strength, and the insufficient safety reserve is a risk factor for building materials. Therefore, construction steel The yield ratio problem has become an important issue to meet the safety reserve of prestressed concrete structures
[0004] However, until now, the prior art has not developed a steel bar for prestressed concrete with low relaxation and low yield ratio.
The steel bar after traditional quenching and tempering has the characteristics of low relaxation, but the yield ratio is relatively high
Although the stabilized steel bars have the characteristics of low relaxation, they often need to be pickled and cause environmental pollution.

Method used

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  • Production process of rebar for concrete
  • Production process of rebar for concrete
  • Production process of rebar for concrete

Examples

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example 1

[0019] After the 30MnSi hot-rolled wire rod is released through the pay-off machine, it is descaled, and the mold is drawn and formed to be straightened. The hot-rolled wire rod is continuously passed through the heating ring and the cooling water ring by a high-frequency induction heating furnace to heat the steel. Austenitize to above Ac1, spray water quenching and cooling, then carry out continuous tempering treatment, and apply a certain tension to the steel on the tempering unit, wherein, the quenching temperature is 750°C, the tempering temperature is 350°C, the tension value 30% of the original breaking force, spray water to cool, and obtain the product.

example 2

[0021] After the 30MnSi hot-rolled wire rod is released through the pay-off machine, it is descaled and straightened without drawing. The hot-rolled wire rod is continuously passed through the heating ring and the cooling water ring by a high-frequency induction heating furnace to heat the steel. Austenitization shall be carried out above Ac1, continuous tempering shall be carried out after quenching and cooling by water spraying, and a certain tension shall be applied to the steel on the tempering unit, among which, the quenching temperature is 980°C, the tempering temperature is 600°C, 1% of the original breaking force, spray water to cool, and obtain the product.

example 3

[0023] After the 30MnSi hot-rolled wire rod is released through the pay-off machine, the scale is removed, the mold is drawn and formed, and then straightened. The hot-rolled wire rod is continuously passed through the heating ring and the cooling water ring by a high-frequency induction heating furnace, and the steel is heated to Ac1 or more to carry out austenitization, continuous tempering treatment after spray quenching and cooling, and a certain tension is applied to the steel on the tempering unit. Among them, the quenching temperature is 810°C, the tempering temperature is 480°C, and the tension value is 5% of the original breaking force, spray water to cool, and obtain the product.

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Abstract

The invention discloses a production process of rebar for concrete. The production process comprises the following steps of: removing scales on a hot rolling steel wire rod; straightening the hot rolling steel wire rod after forming with die drawing or roller die drawing, or directly straightening the hot rolling steel wire rod without drawing; leading the hot rolling steel wire rod to continuously pass through a heating ring and a cooling water ring by a high-medium frequency induction furnace; heating the rebar to Ac1 above so as to carry out austenization; quenching and cooling the rebar by spraying water; executing drawing temper, and applying tension on the rebar when tempering; and cooling the rebar by spraying water to obtain the rebar for the concrete.

Description

technical field [0001] The invention relates to a production process of steel bars for concrete, in particular, the invention relates to a production process of steel bars for concrete with high strength, low relaxation and low yield ratio. Background technique [0002] Rebar for prestressed concrete has been widely used in prestressed components such as high-strength prestressed concrete centrifugal pipe piles, concrete pipe piles for viaduct piers, utility poles, and railway sleepers abroad. The application fields of domestic prestressed steel have expanded from railways and highways to engineering fields such as construction, water conservancy, energy, and geotechnical anchorage. Steel bars for prestressed concrete are generally obtained by heat treatment. High-strength prestressed steel bars that have been strengthened and toughened by heat treatment are a kind of high-strength low-alloy structural steel obtained by quenching and tempering after a little cold drawing or ...

Claims

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Application Information

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IPC IPC(8): C21D8/08
Inventor 范玫光林双平孙本荣杨聚星陈巧飞邓少奎
Owner CHINA IRON & STEEL RES INST GRP
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