High-carbon high-chromium martensitic stainless steel for cutter and preparation method thereof

A carbon-high-chromium martensitic and stainless steel technology, which is applied in the field of high-carbon and high-chromium martensitic stainless steel for cutting tools and its preparation, can solve the problem that the core preparation technology of high-carbon and high-chromium martensitic stainless steel, high-carbon and high-chromium martensitic stainless steel has not yet been mastered. The quality of stainless steel is unstable and the development of the tool industry is restricted, so as to improve the heat treatment process, purify the content of smelting inclusions, and improve the sharpness and durability.

Active Publication Date: 2021-03-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The production process of high-carbon and high-chromium martensitic stainless steel used in high-end knives is complicated, and the requirements for technology and equipment are strict. The quality is unstable, and the core preparation technology of high-carbon and high-chromium martensitic stainless steel has not yet been mastered
The high-carbon and high-chromium martensitic stainless steel used in high-end knives basically relies on imports from developed countries, and foreign countries strictly control the supply of high-end stainless steel knives. The products of developed countries are monopolized, which seriously restricts the development of my country's cutting tool industry in the international market
However, due to the relatively small demand for cutting tool steel and the special requirements for raw materials, the research and development of new materials in the domestic cutting tool industry has been neglected, especially the development and research of high-quality high-carbon and high-chromium cutting tool materials. is limited

Method used

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  • High-carbon high-chromium martensitic stainless steel for cutter and preparation method thereof
  • High-carbon high-chromium martensitic stainless steel for cutter and preparation method thereof
  • High-carbon high-chromium martensitic stainless steel for cutter and preparation method thereof

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preparation example Construction

[0042] The preparation process of the high-carbon high-chromium martensitic stainless steel of the present invention is: batching→smelting→casting molding→forging and thermal processing→cold processing and thermal treatment. Embodiments 1 to 5 are all prepared by the following methods, and the specific steps are as follows:

[0043] (1) mixing each chemical component according to the stated ratio, and obtaining an ingot of steel through smelting and pouring;

[0044] (2) Forging the obtained steel ingot in the austenite single-phase region: the initial forging temperature is 1150°C to 1200°C (1155°C, 1168°C, 1194°C, 1184°C, 1172°C in Examples 1 to 5), the forging ratio Greater than 8 (8.4, 9.1, 8.2, 10.4, 9.3 in Examples 1-5, respectively), after forging, air-cool to room temperature;

[0045] (3) The steel ingot after forging is subjected to controlled rolling: firstly, it is initially rolled in the recrystallization zone, and the rolling temperature is 1100°C to 1200°C (1108...

Embodiment 1

[0050] In this embodiment, by weight percentage, the chemical composition of high-carbon high-chromium martensitic stainless steel for cutting tools is: C: 0.92%, Cr: 14.43%, Co: 1.21%, Mo: 0.63%, V: 0.23%, Mn: 0.25%, La: 25ppm, S: 55ppm, P: 80ppm, and the balance is iron.

Embodiment 2

[0052] In this embodiment, by weight percentage, the chemical composition of high-carbon high-chromium martensitic stainless steel for cutting tools is: C: 1.06%, Cr: 15.08%, Co: 1.52%, Mo: 1.04%, V: 0.29%, Mn: 0.41%, La: 41ppm, S: 50ppm, P: 75ppm, and the balance is iron.

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Abstract

The invention relates to high-carbon high-chromium martensitic stainless steel for a cutter and a preparation method thereof, and belongs to the technical field of materials. The high-carbon high-chromium martensitic stainless steel comprises the following chemical components of, in percentage by weight, 0.90%-1.20% of C, 14.0%-16.0% of Cr, 1.0%-2.0% of Co, 0.5%-1.5% of Mo, 0.20%-0.40% of V, 0.2%-0.6% of Mn, 0.001%-0.01% of La, less than 0.01% of P, less than 0.01% of S and the balance iron. The preparation method of the high-carbon high-chromium martensitic stainless steel comprises the following steps of burdening, smelting, casting molding, forging and hot working, cold working and heat treatment. According to the high-carbon high-chromium martensitic stainless steel for cutter and thepreparation method thereof, the rare earth element content in the material is optimized, primary carbide coarsening is inhibited, carbide uniform distribution is promoted, the heat treatment process is improved, the martensite content and the austenite content in a matrix are controlled, and the optimal matching of the strength and the toughness of the material is obtained.

Description

technical field [0001] The invention relates to a high-carbon high-chromium martensitic stainless steel for cutting tools and a preparation method thereof, belonging to the field of material technology. Background technique [0002] In order to ensure the sharpness and durability of the tool, high-carbon and high-chromium martensitic stainless steel with high hardness and excellent wear resistance is usually used as the raw material. At present, martensitic stainless steel with different carbon and chromium contents is selected according to the grade of the tool product. High-grade cutting tools are usually made of high-carbon and high-chromium martensitic stainless steel with an HRC hardness of 60 or more. At present, the price difference between high, medium and low-grade products in the international knife market is 10:5:1, in which German and Swiss products monopolize the high-end knife market, while Japanese high- and low-grade products maintain strong competitiveness i...

Claims

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Application Information

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IPC IPC(8): C22C38/30C22C38/24C22C38/22C22C38/04C22C33/04C21D8/02C21D9/00C21D1/26C21D1/28C21D1/18C21D6/04
CPCC21D1/18C21D1/26C21D1/28C21D6/04C21D8/0205C21D8/0226C21D8/0236C21D8/0247C21D9/0081C21D2211/008C22C33/04C22C38/005C22C38/04C22C38/22C22C38/24C22C38/30
Inventor 石全强段文峰史显波严伟李艳芬王威单以银
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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