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Steel for wind power main shaft and heat treatment method thereof

A heat treatment method and technology for wind power spindles, which are applied in the field of metallurgy, can solve the problems of unreasonable alloy element ratio and technical requirements for heat treatment time control, and achieve the effects of improving comprehensive mechanical properties, increasing hardenability and accelerating cooling speed.

Inactive Publication Date: 2014-08-27
TONGYU HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The company has been looking for a partner in China for many years, but due to various reasons such as unreasonable alloying element ratio and heat treatment time control, it cannot meet the technical requirements

Method used

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  • Steel for wind power main shaft and heat treatment method thereof
  • Steel for wind power main shaft and heat treatment method thereof
  • Steel for wind power main shaft and heat treatment method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A steel for wind power main shaft, the composition of the chemical element mass percentage is: C 0.34%; Mn 0.53%; Si 0.32%; P 0.006%; Cr 1.6%; Ni 1.57%; Mo 0.25%; Cu 0.05%; H 0.01ppm ; The balance is Fe and other inevitable impurities,

[0017] A heat treatment method of the steel for the wind power main shaft has a quenching temperature of 860-880°C, a time of 14 hours, and then water cooling for 80 minutes.

[0018] A wind power main shaft is prepared by using the steel for the wind power main shaft.

[0019] The mechanical performance test data of the wind power main shaft is shown in Table 1.

[0020]

[0021] The data in Table 1 above shows that the mechanical properties all meet the requirements.

[0022] Large flange center test bar figure 1 , 2 As shown, the structure is uniformly tempered sorbite, and no F precipitation is found.

Embodiment 2

[0024] A steel for wind power main shaft, the composition of the chemical element mass percentage is: C 0.3%; Mn 0.53%; Si 0.4%; P 0.030%; Cr 1.4%; Ni 1.4%; Mo 0.15%; Cu 0.25%; H 0.02ppm The balance is Fe and other unavoidable impurities. The heat treatment method of wind power spindle steel includes the following steps: Quenching: temperature 860-880℃, time 14h, then water cooling for 80 minutes.

[0025] The mechanical performance test of the wind power main shaft made of the above-mentioned wind power main shaft steel shows that the mechanical properties all meet the requirements.

Embodiment 3

[0027] A steel for wind power main shaft, the composition of the chemical element mass percentage is: C 0.38%; Mn 0.75%; Si 0.25%; P 0.015%; Cr 1.70%; Ni 1.70%; Mo 0.30%; Cu 0.1%; H≤0.015 ppm; the balance is Fe and other unavoidable impurities. The heat treatment method of wind power spindle steel includes the following steps: Quenching: temperature 860-880℃, time 14h, then water cooling for 80 minutes.

[0028] The mechanical performance test of the wind power main shaft made of the above-mentioned wind power main shaft steel shows that the mechanical properties all meet the requirements.

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Abstract

The invention provides steel for a wind power main shaft and a heat treatment method thereof. The steel for the wind power main shaft is composed of the following chemical elements in mass percent: 0.3-0.38% of C, 0.53-0.75% of Mn, not more than 0.4% of Si, not more than 0.030% of P, 1.4-1.70% of Cr, 1.4-1.70% of Ni, 0.15-0.30% of Mo, not more than 0.25% of Cu, not more than 0.02ppm of H, and the balance of Fe and other unavoidable impurities; the heat treatment method of the steel for the wind power main shaft comprises the following steps: quenching for 14 hours at 860-880 DEG.C, and water-cooling for 80 min.

Description

Technical field [0001] The invention relates to the technical field of metallurgy, in particular to a steel for a wind power main shaft and a heat treatment method. Background technique [0002] In recent years, with the continuous development of the heavy industry, the performance requirements for forgings have become higher and higher. Some large forgings have gradually developed from hardness requirements or skin sampling to sampling at R / 3, and even sampling at the center. Wind power main shaft is an important part of wind power equipment. The main materials are 42CrMo and 34CrNiMo6. The heat treatment uses quenching and tempering process. A foreign company's MW-class wind power spindle made of 34CrNiMo6 requires a mechanical performance sample to be taken at the center of the flange. The specific technical requirements are as follows: [0003] [0004] The company has been looking for partners in China for many years, but it cannot meet the technical requirements due to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C21D6/00C21D1/18
Inventor 司兴奎刘殿山曹智勇呙文武颜廷勇
Owner TONGYU HEAVY IND