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Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same

A technology of reinforced concrete and a manufacturing method, which is applied in the field of steel bar products and its manufacturing, can solve the problems of no stirrup products and no intermediate strength stirrup manufacturing methods, etc., and achieves convenient construction, enhanced strength, and saving steel consumption. Effect

Inactive Publication Date: 2009-05-06
北京钢研新冶工程技术中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] (2) The HRB400 and HRB500 hot-rolled ribbed steel bars in this standard have not been used as stirrups in reinforced concrete
In the existing materials, there is no stirrup product of intermediate strength level, and there is no report on the manufacturing method of this intermediate strength stirrup

Method used

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  • Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
  • Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same
  • Reinforcement steel bar for medium-high strength hoop for rods for reinforcing concrete and method for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0068] Example 1 , in weight %, containing 0.15-0.30% C, 0.5-1.5% Mn, ≤2.0% Si, the rest is Fe and unavoidable impurities of hot-rolled wire rod, after mechanical descaling, rotary die continuous drawing into a smooth Round, spiral groove or spiral rib shape stirrups are used.

Embodiment 2

[0069] Example 2 , using low-carbon steel hot-rolled wire rods with a composition of more than 0.15% C, more than 0.25% Si, and more than 0.65% Mn as raw materials, which are mechanically derusted and continuously drawn by a rotary die into a light garden, spiral groove or spiral rib shape, or Direct heat treatment without drawing. The heat treatment temperature is: quenching temperature 950-1050°C, tempering temperature 400-550°C. Can produce ф6-ф16mm, 600N / mm 2 A steel bar for stirrups with the above yield strength, 12-15% elongation, and no cracks after bending for 1.5 days.

Embodiment 3

[0070] Example 3 , using low-carbon steel hot-rolled wire rods with a composition of more than 0.18% C, more than 0.55% Si, and more than 0.85% Mn as raw materials, which are mechanically derusted and continuously drawn by a rotary die into a light garden, spiral groove or spiral rib shape, or Direct heat treatment without drawing. The heat treatment temperature is: quenching temperature 900-1000°C, tempering temperature 400-500°C. Can produce ф6-ф16mm, 750N / mm 2 Stirrup bars with above yield strength, 10-15% elongation, and no cracks after bending for 1.5 days.

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Abstract

The invention provides a reinforcing bar for reinforced concrete and medium and high strength stirrup, which has the advantages of 600 to 1,200N / mm<2> yield strength, high specific elongation, good flexural property and good anchoring property and weldability, and a method for manufacturing the same, wherein according to the weight percentage, a hot finished rod containing 0.15 to 0.30 percent of C, 0.5 to 1.5 percent of Mn and less than or equal to 2.0 percent of Si, and also containing one or two of Nb, Ti, V and B alloy elements is used as raw materials, and is subjected to draw forming by a die or a roller die, or directly subjected to heat treatment process without drawing to obtain the reinforcing bar. The range of the heat treatment process is as follows: the quenching temperature is between 850 and 1,100 DEG C, and the drawing temperature is between 350 and 550 DEG C. The surface of the reinforcing bar is circular, belt rib or spiral rib shaped and spiral groove shaped.

Description

technical field [0001] The invention relates to a steel bar product and a manufacturing method thereof, in particular to a steel bar for stirrups in a reinforced concrete structure and a manufacturing method thereof. Background technique [0002] Medium and high-strength stirrups for reinforced concrete are steel bars suitable for stirrups in reinforced concrete structures. There is no stirrup product and its manufacturing method related to the yield strength range of this patent in the existing standards of my country and Japan. The current standard specifies The stirrups used are specified as follows: [0003] 1. In my country's GB1499.1-2008 standard, the following two steel bars of ф8-ф12mm are currently used as stirrups in reinforced concrete: [0004] (1), HPB235 grade hot-rolled light garden steel bar, the shape of the steel bar is light garden. [0005] Yield strength: 235N / mm 2 [0006] Elongation: ≥25% [0007] Bending radius of the sample: a=d (a is the nomina...

Claims

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Application Information

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IPC IPC(8): C22C38/04C21D8/06C21D1/18
Inventor 范玫光孙本荣丁吉
Owner 北京钢研新冶工程技术中心有限公司
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