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Heat treatment technology of high-strength bolt

A high-strength bolt and process technology, applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve problems such as rapid cooling, deformation and cracking, prevent quenching deformation and cracking tendency, refine grains, Effects of high plasticity and low temperature impact toughness

Active Publication Date: 2013-01-02
徐州瑞达装备制造有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially when the martensitic transformation occurs near the Ms line, it should not be cooled quickly, otherwise it will easily cause deformation and cracking

Method used

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  • Heat treatment technology of high-strength bolt
  • Heat treatment technology of high-strength bolt

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] The material specification is M36, and the material composition is shown in Table 2; the heat treatment process is shown in Table 3; the mechanical properties of bolts are shown in Table 4:

[0013] Table 2 Material chemical composition analysis (wt.%)

[0014] the element

C

Si

mn

S

P

Cr

Mo

content

0.41

0.248

0.79

0.004

0.010

0.95

0.15

[0015] Table 3 heat treatment process

[0016] Normalizing process

860℃~880℃ for 60 minutes, air cooling

Quenching process

820℃~830℃ for 50 minutes, water quenching and oil cooling

tempering process

575℃~585℃ for 60 minutes, water cooling

[0017] Table 4 Mechanical properties of bolt samples

[0018]

[0019] The strength grade of the high-strength bolt of the present invention is above grade 10.9, and the mechanical properties meet the requirements in Table 1.

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Abstract

The invention relates to a heat treatment technology, specifically to a heat treatment technology of a high-strength bolt, and belongs to the technical field of heat treatment processing. The high-strength bolt is suitable for joint of anchor bolts, tower tubes, machine heads and wind wheels on wind power generation equipment. According to the technology, after quenching heating insulation, a two-liquid quenching mode of water quenching and oil cooling is adopted, a heating workpiece is taken out from a quenching furnace and putted into water to be cooled for 10-15 s such that the temperature of the workpiece is reduced below 400 DEG C, and then the workpiece is putted into oil for continuous cooling. The heat treatment technology by water quenching and oil cooling has effects of refining crystal grains, effectively raising hardenability of large-sized bolts and minimizing and preventing quenching deformation and cracking tendency of large-sized bolts. The connecting bolt prepared by the technology has high strength and simultaneously has high plasticity and low-temperature impact toughness.

Description

technical field [0001] The invention relates to a heat treatment process, in particular to a heat treatment process for high-strength bolts, which belongs to the technical field of heat treatment processing. The high-strength bolts are suitable for the connection of ground anchor bolts, towers, machine heads, and wind blades on wind power generation equipment. Wait. Background technique [0002] With the increasingly prominent environmental protection issues and the increasingly tense energy supply, wind power generation, as a clean and renewable energy generation method, has received more and more attention, which has led to the rapid development of the wind power industry. Wind power is not limited to the development of land platforms, but is moving towards ocean platforms. With the development of the wind power industry, the production of high-strength bolts for wind power generation equipment is also facing unprecedented challenges. With the expansion of wind power inst...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/00C21D1/18C21D11/00
Inventor 王宁陈家瑞谢东徐觉慧王浩王勇
Owner 徐州瑞达装备制造有限公司
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