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A kind of cr54 steel for high-quality coal mine chain link and its production method

A production method and high-quality technology, applied in the field of high-quality Cr54 steel for coal mine chain links and its production, and high-strength coal mine chain steel materials, can solve the problems of insufficient fatigue life of materials, fluctuations in structure uniformity, etc., and achieve surface quality Improvement, improvement of steel surface quality, improvement of microstructure performance and fatigue performance

Active Publication Date: 2020-11-06
XINING SPECIAL STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of insufficient fatigue life of materials and fluctuations in structure uniformity existing in the prior art, the present invention provides a high-quality Cr54 steel for coal mine chain links and its production method

Method used

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  • A kind of cr54 steel for high-quality coal mine chain link and its production method
  • A kind of cr54 steel for high-quality coal mine chain link and its production method
  • A kind of cr54 steel for high-quality coal mine chain link and its production method

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Effect test

Embodiment 1

[0048] A production method of Cr54 steel for high-quality coal mine chain links, including seven steps of primary smelting in a Consteel electric furnace, LF refining, VD vacuum degassing, continuous casting, billet rolling and peeling, continuous rolling, and annealing, specifically:

[0049] (1) Consteel electric furnace primary refining

[0050] During the melting period, use 1500-1540°C to make slag, and take advantage of the favorable opportunity for the de-P reaction to proceed to the positive reaction direction at a lower temperature to effectively remove P; after full melting, the temperature is ≥1540°C, and oxidation begins, and the flow of oxygen supply is controlled. At 1000~3000NM 3 / h, decarburization amount 0.6-1.1%, the timing of adding iron ore depends on the temperature in the furnace, and the total amount is controlled at 9-12Kg / t;

[0051] During the tapping period, when the tapping temperature of the electric furnace is ≥1620°C, it is forbidden to drop oxi...

Embodiment 2

[0080] Adopt the production method of a kind of high-quality coal mine chain link Cr54 steel of embodiment 1 to prepare four groups of high-quality coal mine chain links Cr54 steel, obtain test piece, test piece number is respectively: V64, B36, D66, K27; The production method of Cr54 steel in ratio 1 prepared four groups of control Cr54 steel, and obtained control test pieces, the test piece numbers were: V64, B36, D66, K27.

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Abstract

The invention discloses Cr54 steel for a high-quality coal mine chain ring and a production method thereof. The Cr54 steel is characterized by comprising the following chemical components in percentage by weight (%): 0.21-0.24% of C, 0.14-0.20% of Si, 1.20-1.30% of Mn, 0.45-0.55% of Cr, 0.95-1.05% of Ni, 0.025-0.035% of Al, 0.52-0.58% of Mo, less than or equal to 0.010% of P, less than or equal to0.008% of S, less than or equal to 0.004% of V, less than or equal to 0.0025% of Ti, less than or equal to 0.0003% of B, less than or equal to 0.0009% of O, less than or equal to 0.0080% of N, less than or equal to 0.00012% of H and the balance Fe. According to the Cr54 steel, carbon equivalent, a cold crack sensitivity coefficient and a hot crack sensitivity coefficient are introduced, so that the excellent welding performance of the Cr54 steel is ensured, and the cold and hot brittleness resistance is improved; and the surface quality of the steel is improved by adopting an innovative process, the rejection rate is reduced, and the effective cost is increased less.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and relates to a high-strength steel for coal mine chain links, in particular to a high-quality Cr54 steel for coal mine chain links and a production method thereof. Background technique [0002] With the rapid development of my country's mining industry, the domestic demand for high-strength link products is increasing, and there is an urgent need to develop high-quality chains to meet market demand, but link steel has very high quality requirements, and needs to have higher strength and good impact Toughness, high fatigue life, and requires good corrosion resistance and cold bending performance, so development and production are difficult. [0003] In the prior art, the steel that is widely used to make high-strength coal mine chain rings is Cr54 steel imported from abroad. The chain produced by this steel has the characteristics of good wear resistance, high fatigue life, strong impact ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/06C22C38/44C22C33/06C21D8/02C21C7/10C21C7/064
CPCC21C7/064C21C7/10C21D8/0226C21D8/0263C21D2211/009C22C33/06C22C38/02C22C38/04C22C38/06C22C38/44
Inventor 方光锦苗红生张振民王海龙汪青芳宋孟军于斌
Owner XINING SPECIAL STEEL
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