Smelting process for steel for wind power main shaft and steel for wind power main shaft

A wind power main shaft and process technology, applied in the smelting process of wind power main shaft steel and the field of wind power main shaft steel, can solve the problems of inaccurate control of element content, wide fluctuation range of chemical composition, unstable mechanical properties of steel, etc., and achieve excellent quenching The effects of high permeability and impact toughness, narrow fluctuation range, and stable mechanical properties of steel

Active Publication Date: 2016-06-22
马鞍山川宏再生物资回收有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation of defects is closely related to the process of smelting, casting and crystallization, and these defects are often the main reason for the scrapping of large forgings
Due to the inaccurate control of the element content in the process of the steel material used for wind power main shafts in the prior art, the chemical composition fluctuates widely and the mechanical properties of the steel are not stable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Embodiment 1 The smelting process of steel for wind power main shaft, comprising the following steps:

[0031] S1: Put clean steel scrap in an electric arc furnace and heat it to a molten steel temperature of 1580°C, blow oxygen to slag for dephosphorization and decarburization, stir the molten pool to remove gas and inclusions, and then add deoxidizers to deoxidize, ferroalloys and carburizers in sequence to reduce the temperature Tapping is controlled at 1650°C;

[0032] S2: Pour S1 molten steel into the ladle refining furnace, make slag and add SiFe powder to keep the white slag, add alloy to fine-tune the element content in the molten steel, and adjust the weight percentage of aluminum in the molten steel to 0.035%;

[0033] S3: Transfer the molten steel obtained in S2 with a temperature of 1650°C into a ladle refining furnace, keep the Ar pressure at 0.2 Mpa for 15 minutes under a vacuum of 66.7 Pa, and blow argon for 10 minutes at an argon pressure of 0.05 Pa;

...

Embodiment 2

[0044] Embodiment 2 is based on embodiment 1, the difference is:

[0045] S1: Put the clean steel scrap in the electric arc furnace and heat it to the temperature of molten steel above 1590°C, blow oxygen to slag for dephosphorization and decarburization, stir the molten pool to remove gas and inclusions, and then add deoxidizer to deoxidize, ferroalloy and carburizer in turn. The temperature is controlled at 1670°C for tapping;

[0046] S2: Pour S1 molten steel into the ladle refining furnace, make slag and add SiFe powder to keep the white slag, add alloy to fine-tune the element content in the molten steel, and adjust the weight percentage of aluminum in the molten steel to 0.045%;

[0047] S3: transfer the molten steel obtained in S2 with a temperature of 1690°C into a ladle refining furnace, maintain an Ar pressure of 0.4 MPa under a vacuum of 66.7 Pa for 20 min, and blow argon for 15 min under an argon pressure of 0.05 Pa;

[0048] S4: Carry out hanging ladle casting wi...

Embodiment 3

[0056] Embodiment 3 is based on embodiment 1, difference is:

[0057] S1: Put clean steel scrap in an electric arc furnace and heat it to a molten steel temperature of 1585°C, blow oxygen to slag for dephosphorization and decarburization, stir the molten pool to degas and remove inclusions, and then add deoxidizers to deoxidize, iron alloys and carburizers in sequence to reduce the temperature Tapping is controlled at 1660°C;

[0058] S2: Pour S1 molten steel into the ladle refining furnace, make slag and add SiFe powder to keep the white slag, add alloy to fine-tune the element content in the molten steel, and adjust the weight percentage of aluminum in the molten steel to 0.035-0.045%;

[0059] S3: transfer the molten steel obtained in S2 with a temperature of 1670°C into a ladle refining furnace, maintain an Ar pressure of 0.3 MPa under a vacuum of 66.7 Pa for 25 min, and blow argon for 20 min under an argon pressure of 0.05 Pa;

[0060] S4: Carry out hanging ladle casting...

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PUM

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Abstract

The invention discloses a smelting process for steel for a wind power main shaft. The smelting process comprises the dissolution and impurity removal process utilizing an electric-arc furnace, the refining process utilizing a ladle refining furnace, the impurity removal process utilizing a vacuum furnace and the casting, annealing and retarded cooling process. The smelting process for the steel for the wind power main shaft is simple in step, the steel structure is evener, finer and more compact, and the comprehensive performance of the steel is excellent. The invention further discloses the steel for the wind power main shaft manufactured through the smelting process, the fluctuation range of the steel element composition for the wind power main shaft is narrow, following treatment of steel ingots can be simplified, and the mechanical performance of the steel is more stable.

Description

technical field [0001] The invention relates to the technical field of metal smelting, and specifically relates to a smelting process of steel for wind power main shafts and steel for wind power main shafts. Background technique [0002] By the end of 2012, my country's cumulative installed capacity of wind power reached 75.32 million kw, maintaining the world's largest total installed capacity. Wind turbines operate in a natural environment and experience various extreme weather conditions such as temperature and wind throughout the year, and the stress situation is very complicated. Due to the enlargement of wind turbines, the structure of components is getting bigger and bigger, and the design and manufacturing problems of the main components in wind turbines will become more prominent. The main shaft is an important part of the wind turbine, with a large volume and a large mass. Judging from the actual operation of wind turbines at home and abroad, the fracture of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/18C22C38/08C22C38/16C22C38/12C22C38/02C22C38/04C21C5/52C21C5/54C21C7/10C21C7/072
CPCC21C5/52C21C5/54C21C7/072C21C7/10C22C38/02C22C38/04C22C38/08C22C38/12C22C38/16C22C38/18Y02P10/20
Inventor 高欣王文武薛松
Owner 马鞍山川宏再生物资回收有限公司
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