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Steel for wind power fastener and preparation method thereof

A fastener and steel technology, applied in the field of wind power fastener steel and its preparation, can solve problems such as substandard mechanical properties and short service life, and achieve improved performance, good hardness and mechanical properties, and good microstructure properties. Effect

Active Publication Date: 2021-09-17
CHENGDE JIANLONG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the fasteners in the prior art still have problems such as substandard mechanical properties and short service life.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment provides a steel used for wind power fasteners, the steel includes:

[0047] C 0.41%, Mn 0.724%, Cr 1.14%, Mo 0.22%, Ni 0.12%, Al 0.04%, the balance is Fe and other unavoidable impurities.

[0048] Prepare by the following method:

[0049] The blast furnace molten iron is sequentially subjected to converter steelmaking, deoxidation alloying, refining, continuous casting, heating and rolling to obtain the steel;

[0050] Wherein, adding refining slag with a mass content of 35% alumina in the deoxidation alloying; the refining includes LF refining and VD vacuum refining in sequence; Ni material is added at the beginning of the VD vacuum refining; The basicity of the slag system is 9; the mass percentage of alumina in the refining slag system in the refining is 35%; the inclusion K3 in the refining is 20; the degree of superheat in the continuous casting is 35°C; The pouring speed in the continuous casting is 1.5m / min; the cold slab is preheated, heated a...

Embodiment 2

[0053] This embodiment provides a steel used for wind power fasteners, the steel includes:

[0054] C 0.4%, Mn 0.72%, Cr 1.16%, Mo 0.23%, Ni 0.14%, Al 0.02%, the balance is Fe and other unavoidable impurities.

[0055] Prepare by the following method:

[0056] The blast furnace molten iron is sequentially subjected to converter steelmaking, deoxidation alloying, refining, continuous casting, heating and rolling to obtain the steel;

[0057] Wherein, adding refining slag with a mass content of 38% alumina in the deoxidation alloying; the refining includes LF refining and VD vacuum refining in sequence; Ni material is added at the beginning of the VD vacuum refining; refining in the refining The basicity of the slag system is 8; the mass percentage of alumina in the refining slag system in the refining is 39%; the inclusion K3 in the refining is 10; the degree of superheat in the continuous casting is 30°C; The pouring speed in the continuous casting is 1m / min; the cold slab i...

Embodiment 3

[0060] This embodiment provides a steel used for wind power fasteners, the steel includes:

[0061] C 0.42%, Mn 0.76%, Cr 1.12%, Mo 0.21%, Ni 0.1%, Al 0.05%, the balance is Fe and other unavoidable impurities.

[0062] Prepare by the following method:

[0063] The blast furnace molten iron is sequentially subjected to converter steelmaking, deoxidation alloying, refining, continuous casting, heating and rolling to obtain the steel;

[0064] Wherein, adding refining slag with a mass content of 40% alumina in the deoxidation alloying; the refining includes LF refining and VD vacuum refining carried out in sequence; Ni material is added at the beginning of the VD vacuum refining; refining in the refining The basicity of the slag system is 10; the mass percentage of alumina in the refining slag system in the refining is ≥ 37%; the inclusion K3 in the refining is 5; the superheat in the continuous casting is 15°C; the The pouring speed in the continuous casting is 2m / min; the col...

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Abstract

The invention relates to steel for a wind power fastener and a preparation method thereof. The steel comprises, by mass, 0.4%-0.42% of C, 0.72%-0.76% of Mn, 1.12%-1.16% of Cr, 0.21%-0.23% of Mo, 0.1%-0.14% of Ni, 0.02%-0.05% of Al and the balance Fe and other inevitable impurities. The preparation method comprises the following steps of sequentially carrying out converter steelmaking, deoxidation alloying, refining, continuous casting, heating and rolling on blast furnace molten iron to obtain the steel, wherein refining slag with the mass content of aluminum oxide larger than or equal to 35% is added in the deoxidation alloying process; refining comprises LF refining and VD vacuum refining which are performed in sequence; and a Ni material is added at the beginning of VD vacuum refining. By regulating and controlling the chemical components of the steel, the grain size, banding, inclusions and the like of the internal structure of a bar are improved, the performance and hardness of the bar after heat treatment are remarkably stabilized, and the obtained steel has good structure performance.

Description

technical field [0001] The invention relates to the field of steelmaking, in particular to a steel used for wind power fasteners and a preparation method thereof. Background technique [0002] At present, in recent years, my country's wind power industry, especially large-scale megawatt-level wind turbines with large capacity, has developed rapidly. Wind power fasteners are the main connecting components of wind turbines. In wind turbines, a large number of high-strength bolts are used for connections. Occupies about 22% of wind turbine components. Pitch bearings and hubs, pitch bearings and blades, hubs and generator main shafts, main frames and yaw bearings, main frames and generator frames, main bearings and main frames, gearbox elastic support seats and main frames, towers High-strength bolts are used with the yaw brake disc, tower and tower, and all key connecting parts are connected by high-strength bolts, including the connection of electrical components. The quality...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/06C22C38/44C21C7/00C21C7/06C21C7/10C21D8/06C22C33/04C22C38/04
CPCC22C38/06C22C38/04C22C38/44C22C33/04C21C7/06C21C7/0006C21C7/10C21D8/065
Inventor 李诗斌尹修刚张川程少鹏严雪松
Owner CHENGDE JIANLONG SPECIAL STEEL
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