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Isothermal normalizing treatment technique of wind power flange

A wind power flange, isothermal normalizing technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as increasing production costs, not conducive to improving the overall performance of the tower, and troublesome on-site construction.

Inactive Publication Date: 2015-10-07
SHANDONG IRAETA HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent number is 201110028438.7, and the Chinese patent titled "A Method for Improving the Impact Energy Absorption of Flanges at Ultra-low Temperatures" puts forward higher requirements on the chemical composition of raw materials for wind power flanges. At the same time, different specifications of wind power flanges The use of different cooling methods not only increases the production cost, but also is not conducive to improving the overall performance of the entire tower, and also brings troubles to the site construction

Method used

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  • Isothermal normalizing treatment technique of wind power flange
  • Isothermal normalizing treatment technique of wind power flange
  • Isothermal normalizing treatment technique of wind power flange

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0024] Example 1 Isothermal normalizing of the Q345E wind power flange of φ4200 / φ3720×180 (unit: mm)

[0025] 1. Put 5 pieces of Q345E wind power flanges of φ4200 / φ3720×180 (unit: mm) that have been forged and ring-rolled into the electric furnace, and the distance between each piece is not less than 100mm, and heated to 910°C for austenitization , and keep warm for 4.5 hours according to the thickness of the wind turbine flange;

[0026] 2. After the heat preservation is over, take the wind power flange out of the furnace and put it into the rotating wind field for spraying + blowing cooling. At the same time, open the furnace cover of the electric furnace and use the axial flow fan to blow the furnace to reduce the furnace temperature to 600±10 ℃, cover the furnace cover, and set the furnace temperature at 600 ℃ for heat preservation.

[0027] 3. Transfer to the wind power flange of the rotating wind field, and carry out spraying + blowing cooling. When the temperature in t...

Embodiment 2

[0032] Example 2 Isothermal normalizing of S355NL wind power flange of φ3922 / φ3572×115 (unit: mm)

[0033] 1. Put 5 pieces of S355NL wind power flanges of φ3922 / φ3572×115 (unit: mm) that have been forged and rolled into an electric furnace, and the distance between each piece is not less than 100mm, and heated to 910°C for austenitization , and keep warm for 3.0h according to the thickness of the wind power flange;

[0034] 2. After the heat preservation is over, take the wind power flange out of the furnace and put it into the rotating wind field for spraying + blowing cooling. At the same time, open the furnace cover of the electric furnace and use the axial flow fan to blow the furnace to reduce the furnace temperature to 600±10 ℃, cover the furnace cover, and set the furnace temperature at 600 ℃ for heat preservation.

[0035] 3. Transfer to the wind power flange of the rotating wind field and carry out spraying + blowing cooling. When the temperature in the middle of the...

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Abstract

The invention discloses an isothermal normalizing treatment technique of a wind power flange. According to the method, after being subjected to austenization and discharge, the wind power flange is quickly cooled to lower the surface temperature to the ferrite and pearlite transformation temperature range of 550-650 DEG C or so, and is sent into the furnace to perform thermal insulation, so that the transformation process is performed under isothermal conditions, thereby obtaining the uniform ferrite grains and uniformly distributed pearlite structures, lowering the segregation and clustering of various inclusions, further enhancing the overall mechanical properties of the flange and enhancing the low-temperature impact toughness stability of the flange.

Description

technical field [0001] The invention relates to the technical field of flange normalizing treatment, in particular to an isothermal normalizing treatment process for wind power flanges. Background technique [0002] Wind power flanges are generally made of Q345E or S355NL steel, which is forged and rolled, and then normalized or normalized + tempered to obtain high strength, plasticity and low temperature impact toughness. However, due to the ordinary normalizing or normalizing + tempering process, the cooling process after austenitization is continuous, and the controllability is relatively poor. If the cooling rate is too fast, upper bainite and / or widmansterite ferrite structure will be formed, which will cause damage to the performance of the wind turbine flange; if the cooling rate is too slow, the pearlite content in the structure will be insufficient, and the obtained pearlite+ The ferrite structure often has characteristics such as uneven grain size, resulting in un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/28C21D9/00
Inventor 赵丽美牛余刚郑伟任秀凤尚贺军刘守峰
Owner SHANDONG IRAETA HEAVY IND