High-carbon spheroidized sorbite cutting tool steel with high surface hardness and excellent bending performance and production method of high-carbon spheroidized sorbite cutting tool steel

Abstract

The invention relates to high-carbon spheroidized sorbite cutting tool steel with high surface hardness and excellent bending performance and a production method of the high-carbon spheroidized sorbite cutting tool steel. A steel plate is prepared from the following chemical components: 0.60%-1.0% of C, less than or equal to 0.1% of Si, 0.4%-1.5% of Mn, 0.0005%-0.05% of Ca, 0.01%-0.5% of Re, less than or equal to 0.06% of Al, less than or equal to 0.05% of Mg, more than or equal to 0.3 of Ca / S, more than or equal to 1 of Ca / Mg, more than or equal to 0.02 of Ca / Re, 0.1%-1.0% of Sn, less than or equal to 0.020% of P, less than or equal to 0.015% of S and the balance of Fe and inevitable impurities. The produced cutting tool steel is low in Si content, smooth and clean in surface, free of a grain boundary oxidation layer and a decarburized layer, 700-800 MPa in tensile strength, 50% or below in yield ratio, free of cracking after being bent by 180 degrees, excellent in bending performance, free of heat treatment and excellent in abrasion resistance, and the surface hardness is 48 HRC or above.

Description

technical field [0001] The invention relates to the technical field of cutting tool steel production, in particular to a high-carbon spheroidized sorbite cutting tool steel with high surface hardness and excellent bending performance and a production method thereof. Background technique [0002] Due to the high carbon content of conventional cutting tool steel, the hot-rolled structure is mainly pearlite, which is brittle and cracks after bending at a small angle, so it is not suitable for bending into parts with complex shapes. With the development of the times, the use of cutting tool steel is becoming more and more extensive, and its performance requirements are also getting higher and higher. Not only does it require a hardness of 42HRC or more after heat treatment, but the processed shape is also becoming more and more complex. In order to meet the bending processing requirements of some complex parts, cold-rolled annealed cutting tool steel is usually used as the raw m...

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Problems solved by technology

[0013] The invention provides a high-carbon spheroidized sorbite cutting tool steel with high surface hardness and excellent bending performance and a production method thereof, which overcomes the problems of severe decarburization and oxidation on the surface of the existing cutting tool steel and is not suitable for bending. Cutting tool steel has low Si content, smooth surface, no grain boundary oxide layer and decarburization layer, tensile strength 700MPa~800MPa, yield strength ratio below 50%, 180°bend without cracking, excellent bending performance, no need for heat treatment surface hardness Above 48HRC, excellent wear resistance, high production efficiency and low cost

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