Co-free superhard high speed steel

Abstract

The invention provides a novel Co-free superhard high speed steel. The Co-free superhard high speed steel contains no cobalt in a steel ingot solidification process, and the hardness of the quenched and annealed Co-free superhard high speed steel can reach to about HB. The surface layer carbon content of the Co-free superhard high speed steel is close to balance carbon t after being subjected to low moisture and low carbon potential carburization and low moisture quenching treatment, and the hardness of the quenched and annealed steel exceeds HB 67, and the hardness gradually decreases to the core hardness within a thickness of about 1.5. The carbon content t of the Co-free superhard high speed steel is lower than r+M in a high speed steel state graph, and the carbon content corresponding to the vertex of a phase region c is not lower than carbon saturation A necessary for obtaining enough core hardness. The Co-free superhard high speed steel provided by the invention is free of carbide segregation and thick carbide which cause reduction of the obdurability.

Description

technical field [0001] The invention relates to a steel product, specifically a superhard high-speed steel. . Background technique [0002] Co-containing high-speed steel has excellent superhardness, red hardness, and grindability, and it has long been [0003] production, but due to its poor thermal processing plasticity, poor process performance, easy oxidation and decarbonization, etc. [0004] The yield rate of steel and cutting tools is very low, especially if the Co content is above 5%, Co is a strategic shortage [0005] Materials, the current current price is 440,000 yuan / ton, which is expensive, resulting in high cost of steel and high price, making it difficult to [0006] Promote apps. Contents of the invention [0007] The invention provides a novel high-speed steel without Co superhard high-speed steel. Co-free super-hard high-speed steel, cobalt-free high-speed steel that does not contain cobalt during the solidification process of the ingot and can reac...

AI Technical Summary

Problems solved by technology

[0005] Materials, the current current price is 440,000 yuan / ton, which is expensive, resulting in high cost of steel and high price, making it difficult to