High-strength anchor bolt and production method thereof

A technology for anchoring bolts and production methods, which is applied in the field of metallurgy, can solve the problems that the strength cannot be exceeded, achieve the effects of fast heating speed, fine microstructure, and improved safety reserve capacity

Inactive Publication Date: 2013-01-16
CHINA IRON & STEEL RES INST GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the strength of anchor bolts produced by hot rolling in the prior art cannot exceed 800MPa, so high-strength anchor bolts must be produced through deep processing

Method used

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  • High-strength anchor bolt and production method thereof
  • High-strength anchor bolt and production method thereof

Examples

Experimental program
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Effect test

example 1

[0034] Utilize the method according to the present invention to prepare high-strength anchor bolts, which include C0.38%, Si0.27%, Mn0.61%, Cr0.88%, and the balance of iron and unavoidable impurities by weight percentage. The high-strength anchor bolts continuously complete feeding, roller conveying, front traction roller, quenching induction heating, quenching cooling, tempering induction heating, tempering cooling, rear traction roller, roller conveying, unloading, etc. on the induction heat treatment production line. Packaging and other production processes. Quenching heating temperature: 820°C, then cooling, tempering heating temperature: 450°C. The yield strength of the steel bar is 1030MPa, the tensile strength is 1165MPa, the elongation A after fracture is 16.0%, the shear strength is 827MPa, and the impact energy at 20°C is 89J.

[0035] figure 1 shows a micrograph of the metallographic structure of the high-strength anchor bolt according to Example 1, according to ...

example 2

[0037] Utilize the method according to the present invention to prepare high-strength anchor bolts, which include C0.42%, Si0.32%, Mn0.71%, Cr0.98%, and the balance of iron and unavoidable impurities by weight percentage. The high-strength anchor bolts continuously complete feeding, roller conveying, front traction roller, quenching induction heating, quenching cooling, tempering induction heating, tempering cooling, rear traction roller, roller conveying, unloading, etc. on the induction heat treatment production line. Packaging and other production processes. Quenching heating temperature: 780°C, then cooling, tempering heating temperature: 400°C. The yield strength of the steel bar is 860MPa, the tensile strength is 1020MPa, the elongation A after fracture is 18.0%, the shear strength is 719MPa, and the impact energy at 20°C is 109J.

[0038] figure 2 shows a micrograph of the metallographic structure of the high-strength anchor bolt according to Example 2, according to ...

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Abstract

The invention provides a high-strength anchor bolt and a production method thereof. The high-strength anchor bolt comprises the following components in percentage by weight: 0.25 to 0.50 percent of C, 0.2 to 1.5 percent of Si, 0.5 to 2.0 percent of Mn, less than or equal to 0.03 percent of P, less than or equal to 0.03 percent of S and the balance of iron and inevitable impurities. The high-strength anchor bolt is subjected to continuous sensing heat treatment, wherein the mechanical properties of the high-strength anchor bolt are that the tensile strength sigma b is 830 to 1,220MPa, the shear strength is more than or equal to 0.7 sigma b, the percentage elongation after fracture is more than or equal to 14 percent, and ballistic work at the temperature of 20 DEG C is more than or equal to 60J. The high-strength anchor bolt has the advantages of high strength, high ductility and impact resistance, and can effectively solve the problem of brittle rupture.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a high-strength anchor bolt and a production method thereof. Background technique [0002] The bearing system has been widely used in highway and railway bridges, and has become the main bearing type of bridge structures. [0003] At present, the structures of several series of supports in the prior art are basically the same. The upper support plate of the one-way movable support is a type of channel-shaped steel plate, and the two limbs of the channel-shaped steel plate are used to limit the lateral displacement of the support and transmit horizontal force. The support is composed of the upper swing of the support and the lower swing of the support. The upper swing is pre-embedded at the bottom of the PC track beam end. The anchor bolts connect the lower swing of the support with the base embedded on the pier cap beam. The upper and lower swing of the support pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/04C21D1/42C21D9/00C21D1/18F16B13/00
CPCY02P10/25
Inventor 林双平张岩苗明明
Owner CHINA IRON & STEEL RES INST GRP
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