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High-strength, high-toughness and good-weldability steel for mine machinery and production method of steel

A technology of steel for machinery, high strength and toughness, applied in the field of metallurgy, can solve the problems of comprehensive mechanical properties, low strength, low hardness and poor weldability of steel used for roller gear seats, and achieve guaranteed composition and mechanical properties, good weldability, The effect of improving welding performance

Active Publication Date: 2018-09-21
SHIJIAZHUANG IRON & STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

35CrMnSiA material has high strength, but poor toughness; 20CrNiMo material has good weldability, less tendency to form welding cold cracks, but low strength and hardness; 42CrMo has high strength and toughness, but poor weldability
Several materials currently used are not suitable for the comprehensive mechanical properties of steel for roller tooth seats. It is urgent to develop a steel for roller tooth seats that has wear resistance, impact resistance and good welding performance.

Method used

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  • High-strength, high-toughness and good-weldability steel for mine machinery and production method of steel
  • High-strength, high-toughness and good-weldability steel for mine machinery and production method of steel
  • High-strength, high-toughness and good-weldability steel for mine machinery and production method of steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] See Table 1 for the chemical composition and mass percentage of the steel for mining machinery with high strength, toughness and good weldability in this example.

[0029] The production method of high-strength toughness and good weldability mining machinery steel in this embodiment includes smelting, continuous casting, heating, rolling, quenching and tempering treatment processes, and the specific process steps are as follows:

[0030] (1) Smelting process: 42kg / t steel of ferronickel is added to the converter, and 8kg / t of nickel plate is added to the steel ladle during the tapping process of the converter; the vacuum holding time of VD vacuum degassing treatment is 10min, and aluminum is fed after VD vacuum degassing treatment. Wire 0.3kg / t steel;

[0031] (2) Continuous casting process: the slab is cooled in a slow cooling pit, the temperature of entering the pit is 656°C, and the pit cooling time is 30h; the chemical composition and mass percentage of the slab are...

Embodiment 2

[0037] See Table 1 for the chemical composition and mass percentage of the steel for mining machinery with high strength, toughness and good weldability in this example.

[0038] The production method of high-strength toughness and good weldability mining machinery steel in this embodiment includes smelting, continuous casting, heating, rolling, quenching and tempering treatment processes, and the specific process steps are as follows:

[0039] (1) Smelting process: 42.8kg / t steel of ferronickel is added to the converter, and 8kg / t steel is added to the ladle during the tapping process of the converter; VD vacuum degassing treatment, vacuum holding time 20min, feeding after VD vacuum degassing treatment Aluminum wire 0.32kg / t steel;

[0040] (2) Continuous casting process: the slab is cooled in a slow cooling pit, the temperature of entering the pit is 632°C, and the pit cooling time is 30h; the chemical composition and mass percentage of the slab are shown in Table 1;

[004...

Embodiment 3

[0046] See Table 1 for the chemical composition and mass percentage of the steel for mining machinery with high strength, toughness and good weldability in this example.

[0047] The production method of high-strength toughness and good weldability mining machinery steel in this embodiment includes smelting, continuous casting, heating, rolling, quenching and tempering treatment processes, and the specific process steps are as follows:

[0048] (1) Smelting process: 42kg / t steel of ferronickel is added to the converter, and 12kg / t of nickel plate is added to the steel ladle during the tapping process of the converter; the vacuum holding time of VD vacuum degassing treatment is 10min, and aluminum is fed after VD vacuum degassing treatment. Wire 0.3kg / t steel;

[0049] (2) Continuous casting process: the slab is cooled in a slow cooling pit, the temperature of entering the pit is 600°C, and the pit cooling time is 25h; the chemical composition and mass percentage of the slab ar...

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Abstract

The invention discloses high-strength, high-toughness and good-weldability steel for mine machinery and a production method of the steel. The steel for mine machinery comprises, by mass, 0.22-0.29% ofC, 0.16-0.30% of Si, 0.35-0.60% of Mn, 1.24-1.58% of Cr, 1.20-1.60% of Ni, 0.23-0.30% of Mo, 0.021-0.035% of Al, 0-0.020% of P, 0-0.015% of S and the balance Fe and inevitable impurities. The production method comprises the treatment processes of smelting, continuous casting, heating, rolling and tempering. The chemical components are matched, Ni ensures high toughness, Cr, Ni, Mo and the like ensure high strength, the content of C is reduced to improve the weldability, the problem that similar steel cannot achieve high strength, high toughness and good weldability at the same time is solved,and the requirement of the mine machinery for the steel is met.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a steel for mining machinery with high strength, toughness and good weldability and a production method thereof. Background technique [0002] Shearer is an important equipment for coal production. The gear seat of the working part of the shearer drum is directly welded to the spiral blade, which is used to fix the pick and transmit the power of the engine to the pick to realize the process of coal cutting. . The working environment of the shearer is harsh, and the surface of the tooth seat of the coal mining unit is subjected to impact and wear from the coal seam or rock during the coal mining process, which often causes the failure of the tooth seat of the shearer drum; and because the top and bottom plates often change, As a result, the shearer is subjected to variable stresses during the cutting process, resulting in frequent welding of the roller tooth seat o...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C21D8/00C21D1/18C21D6/00
CPCC21D1/18C21D6/004C21D6/005C21D6/008C21D8/005C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 张永王信康黄胜永杨进航李福勇李冠军戴观文郑朝辉孙晓明王绍丹华祺年
Owner SHIJIAZHUANG IRON & STEEL
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