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A kind of high-carbon high-chromium martensitic stainless steel for cutting tools and its preparation method
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A carbon-high-chromium martensitic and stainless steel technology, which is applied in the field of high-carbon high-chromium martensitic stainless steel for cutting tools and its preparation, can solve the problem of not mastering the core preparation technology of high-carbon and high-chromium martensitic stainless steel, high-carbon and high-chromium Unstable quality of stainless steel, restricting the development of the cutting tool industry and other issues, to achieve the effect of improving the heat treatment process, purifying the content of smelting inclusions, improving sharpness and durability
Active Publication Date: 2021-10-22
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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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
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[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 a high-carbon high-chromiummartensitic stainless steel for cutting tools and a preparation method thereof, belonging to the field of material technology. In terms of weight percentage, the chemical composition of the high-carbon high-chromiummartensitic stainless steel is: C: 0.90-1.20%, Cr: 14.0-16.0%, Co: 1.0-2.0%, Mo: 0.5-1.5%, V: 0.20 ~0.40%, Mn: 0.2~0.6%, La: 0.001~0.01%, P<0.01%, S<0.01%, and the balance is iron. The preparation method of the high-carbon high-chromiummartensitic stainless steel is: batching→smelting→casting molding→forging and hot working→cold working and heat treatment. The invention suppresses the coarsening of primary carbides and promotes the uniform distribution of carbides by optimizing the content of rare earth elements in the material, and controls the content of martensite and austenite in the matrix by improving the heat treatment process to obtain the strength and toughness of the material. The best match.
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...
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