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
View PDF2 Cites 2 Cited by
  • 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 mat

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • 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

Example Embodiment

[0027] Example 1

[0028] The chemical composition and mass percentage of the steel for mining machinery with high strength and toughness and good weldability in this embodiment are shown in Table 1.

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

[0030] (1) Smelting process: the converter is charged with 42kg / t of ferronickel steel, and 8kg / t of nickel is added to the ladle during the converter tapping process; 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 the slow cooling pit, the pit temperature is 656℃, and the pit cooling time is 30h; the chemical composition of the slab and its mass percen...

Example Embodiment

[0036] Example 2

[0037] The chemical composition and mass percentage of the steel for mining machinery with high strength and toughness and good weldability in this embodiment are shown in Table 1.

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

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

[0040] (2) Continuous casting process: the slab is cooled in the slow cooling pit, the pit temperature is 632℃, and the pit cooling time is 30h; the chemical composition of the slab and its mass percenta...

Example Embodiment

[0045] Example 3

[0046] The chemical composition and mass percentage of the steel for mining machinery with high strength and toughness and good weldability in this embodiment are shown in Table 1.

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

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

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap