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Carburizing super-wear-resistant chain steel for slag extractor

A technology of super wear-resistant and slag machine, applied in the field of metallurgy, can solve the problems of low breaking strength, unreachable chain surface hardness, poor chain plastic toughness, etc.

Active Publication Date: 2021-10-26
SHIJIAZHUANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After years of use, 17CrNiMo6 and 15CrNi6 have exposed the following problems in the process of production and actual use: the surface hardness of the chain after carburizing sometimes does not meet the requirements of ≥800HV, and the hardness of the core is relatively high (≥400HV), especially for diameters ≥30mm chain, due to the high hardness of the core, the chain has poor plasticity and toughness and low breaking strength

Method used

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  • Carburizing super-wear-resistant chain steel for slag extractor
  • Carburizing super-wear-resistant chain steel for slag extractor
  • Carburizing super-wear-resistant chain steel for slag extractor

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Embodiment Construction

[0022] The present invention will be described in further detail below in conjunction with specific embodiments.

[0023] The carburized super wear-resistant slagging machine chain steel according to the present invention has the following chemical composition and mass percentage: C: 0.09-0.13%, Si: 0.15-0.35%, Mn: 0.40-0.60%, P≤ 0.015%, S≤0.015%, Cr: 1.40~1.70%, Ni: 1.40~1.70%, Mo: 0.25~0.35%, Cu: 0.08~0.12%, Al: 0.020~0.050%, the rest is iron and unavoidable Impurities.

[0024] The chain steel is produced by the following method: including converter / electric furnace smelting, LF refining, vacuum degassing, continuous casting, continuous rolling and annealing processes. The rolling reduction ratio in the continuous rolling process is ≥19.8, the starting rolling temperature is 1000-1060°C, and the stack cooling is performed after rolling. The annealing process is carried out in a continuous annealing furnace. The steel stays in the high-temperature transition zone of the co...

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Abstract

The invention discloses carburized super-wear-resistant chain steel for a slag extractor, and belongs to the technical field of metallurgy. The chain steel is prepared from chemical components in percentage by mass as follows: 0.09%-0.13% of C, 0.15%-0.35% of Si, 0.40%-0.60% of Mn, smaller than or equal to 0.015% of P, smaller than or equal to 0.015% of S, 1.40%-1.70% of Cr, 1.40%-1.70% of Ni, 0.25%-0.35% of Mo, 0.08%-0.12% of Cu, 0.020%-0.050% of Al and the balance of iron and inevitable impurities. The chain steel is good in welding performance, and a carburized chain machined through the chain steel is excellent in surface hardness, core hardness, effective hardened layer depth larger than or equal to 550 HV, breaking load and breaking elongation.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and relates to a chain steel, in particular to a carburized super wear-resistant slag extractor chain steel. Background technique [0002] With the continuous progress of my country's thermal power technology, generating units are increasingly moving towards the direction of large-scale development. The chain of the slag discharger wears fast or the chain breaks, which seriously affects the operation safety of the unit. Divided according to product performance characteristics, the slag discharge chain is divided into two series: high strength and high hardness. High-strength chains have disadvantages such as low hardness, fast wear, high frequency of chain interception, and heavy maintenance workload; high-hard chains have the characteristics of high hardness, slow wear, small maintenance workload, and long service life. At present, there is no special standard for high-hardness chains, and t...

Claims

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Application Information

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IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D1/18C21D1/26C21D6/00C22C33/04
CPCC22C38/02C22C38/04C22C38/06C22C38/44C22C38/42C21D1/18C21D1/26C21D6/008C21D6/005C21D6/004C22C33/04C21D2211/005C21D2211/009Y02P10/20
Inventor 黄永建孙晓明武兴旺丁辉戴观文李元王国营李冠军李福勇张士乾
Owner SHIJIAZHUANG IRON & STEEL