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Economical tool steel with good fatigue life and production method thereof

A technology of fatigue life and production method, applied in the field of metallurgy, can solve the problems of high manufacturing cost, long manufacturing cycle, large energy consumption, etc., and achieve the effects of improving product yield, shortening manufacturing cycle, and shallow decarburization layer.

Active Publication Date: 2019-12-27
武汉钢铁有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the manufacture of high-carbon steel such as tool steel often has the following problems: 1) The process is lengthy and complicated, including multiple processes such as hot rolling, pickling, cold rolling, annealing, etc., and the manufacturing cycle is long; 2) Energy consumption is large and the manufacturing high cost

Method used

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  • Economical tool steel with good fatigue life and production method thereof
  • Economical tool steel with good fatigue life and production method thereof
  • Economical tool steel with good fatigue life and production method thereof

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Embodiment 1～5

[0034] Each embodiment of the present invention is produced according to the following steps:

[0035] 1) Smelting: The carbon content of the steel from the converter is ≥0.05%, and after the deoxidation is completed, add ferrovanadium, and soft blow for 3-8 minutes after calcium treatment in the later stage of refining;

[0036] 2) Continuous casting: the nozzle is sealed with argon to avoid oxygen and nitrogen absorption during the molten steel casting process, the superheat is 15-30°C, and the thickness of the billet is 200-250mm;

[0037] 3) Heating: the billet heating temperature is 1150-1250°C, and the holding time is 30-90 minutes;

[0038] 4) Rough rolling: the starting rolling temperature is 1030-1130°C, the final rolling temperature is 900-980°C, the thickness of the intermediate billet is 45-60mm, and the single-pass reduction rate is ≥45%;

[0039] 5) Finish rolling: the starting rolling temperature is 820-900°C, the final rolling temperature is 630-680°C, and the...

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Abstract

The invention discloses economic tool steel with good fatigue life and a production method thereof. The steel comprises the following chemical components by weight percent: 0.75% to 1.00% of C, 0.15% to 0.35% of Si, 0.50% to 1.20% of Mn, 0.30% to 1.10% of Cr, 0.05% to 0.20% of V, 0.040% or less of Alt, 0.020% or less of P, 0.010% or less of S and 0.006% or less of N, and the balance being iron and unavoidable impurities. The method comprises the steps of acquiring uniform granular pearlite structures through hot rolling and short-cycle annealing, and acquiring fine tempered martensite structures through quenching and tempering. The tool steel produced through the production method is fine and uniform in structure and shallow in decarburized layer, and has high abrasion resistance and good fatigue life, the manufacturing cycle is greatly shortened, manufacturing cost is reduced, and the product yield is increased.

Description

technical field [0001] The invention relates to metallurgical technology, in particular to an economical tool steel with good fatigue life and a production method thereof. Background technique [0002] Tool steel has high strength, high hardness, high wear resistance and good fatigue life after quenching. Therefore, tool steel is mostly used to manufacture various cutting tools, forming tools and measuring tools. [0003] The carbon content of tool steel is generally greater than 0.7%. There are large areas of hard and brittle layered carbides or network carbides in the hot-rolled structure, which are not easy to process and deform. It is also easy to cause overheating, quenching deformation, cracks and other defects during the quenching process. In order to avoid the above problems and improve the fatigue life of tool steel, tool steel should change the morphology and distribution of carbides in the steel before quenching to obtain granular pearlite structure. [0004] How...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02C22C38/24C22C38/06C21D8/00C21D1/26C21D1/18
CPCC21D1/18C21D1/26C21D8/005C21D2211/008C22C38/02C22C38/04C22C38/06C22C38/24
Inventor 蔡珍毛新平徐进桥李国彬汪水泽何亚元甘晓龙孙宜强
Owner 武汉钢铁有限公司
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