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A kind of smelting process of steel for wind power main shaft and steel for wind power main shaft

A wind power main shaft and process technology, which is applied to the smelting process of steel for wind power main shaft and the field of steel for wind power main shaft, 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 effect of permeability and impact toughness, narrow fluctuation range and stable mechanical properties of steel

Active Publication Date: 2017-07-18
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 wind power main shaft steel includes the following steps:

[0031] S1: Put clean steel scrap in an electric arc furnace and heat it to a molten steel temperature of 1580℃, blow oxygen to make slagging, dephosphorize and decarburize, stir the molten pool to degas and remove inclusions, and then add deoxidizers, ferroalloys, and recarburizers in sequence. Control the tapping at 1650℃;

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

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

[0034] S4: Ladle casting is carried out with a steel ladle, the...

Embodiment 2

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

[0045] S1: Put the clean steel scrap in an electric arc furnace and heat it to a temperature above 1590℃, blow oxygen to make slag, dephosphorize and decarburize, stir the molten pool to degas and remove inclusions, and then add deoxidizers, ferroalloys and recarburizers in sequence. The temperature is controlled at 1670℃ for tapping;

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

[0047] S3: Transfer the molten steel with a temperature of 1690°C obtained from S2 to the ladle refining furnace, keep the Ar pressure 0.4MPa under a vacuum of 66.7Pa, keep it for 20min, and blow argon at a pressure of 0.05pa for 15min;

[0048] S4: Ladle casting is carried out with a steel ladle, the molten steel casting t...

Embodiment 3

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

[0057] S1: Put clean steel scrap in an electric arc furnace and heat it to a molten steel temperature of 1585℃, blow oxygen to make slagging, dephosphorize and decarburize, stir the molten pool to degas and remove inclusions, and then add deoxidizer, ferroalloy and recarburizer in turn Control the tapping at 1660℃;

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

[0059] S3: Transfer the molten steel with a temperature of 1670°C obtained from S2 to the ladle refining furnace, maintain the Ar pressure at 0.3 MPa under a vacuum of 66.7 Pa for 25 minutes, and blow argon at a pressure of 0.05 Pa for 20 minutes;

[0060] S4: Use a steel ladle for hanging ladle casting, control the molten steel cas...

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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 technical field of metal smelting of the present invention specifically relates to a smelting process of steel for wind power main shaft and steel for wind power main shaft. Background technique [0002] As of the end of 2012, my country's cumulative wind power installed capacity 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 tests such as temperature and wind throughout the year, and the force conditions are very complicated. Due to the large-scale wind turbines, the structure of parts and components becomes larger and larger, and the design and manufacturing of the main components of the wind turbines will become more prominent. The main shaft is an important part of the wind turbine, which is large in size and high in mass. Judging from the actual operation of wind turbines at home and abroad, spindle fracture is the main form ...

Claims

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Application Information

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Patent Type & Authority Patents(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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