High-toughness and high-wear-resistant cold-work die steel

Abstract

The invention discloses a high-toughness and high-wear-resistant cold-work die steel, belonging to the field of tool and die steels. The steel comprises the following chemical components in percentage by weight: 0.8-1.5% of C, 0.5-1.5% of Si, less than or equal to 0.030% of S, less than or equal to 0.030% of P, less than or equal to 1.5% of Mn, 0.8-2.5% of Mo, 8.0-11.0% of Cr, 0.1-1.0% of V, less than or equal to 1.0% of N, and the balance of Fe and inevitable impurities. Compared with the prior art, the high-toughness and high-wear-resistant cold-work die steel disclosed by the invention keeps high wear resistance, and has higher toughness and bending strength and good comprehensive performances at the same time. Compared with a Cr12 type cold-work die steel, the high-toughness and high-wear-resistant cold-work die steel reduces the Cr content, and ensures that a material has higher toughness. Compared with a Cr8 type cold-work die steel, the high-toughness and high-wear-resistant cold-work die steel increases the Cr content, increases the wear resistance, and reasonably controls the C / Cr ratio, thus achieving the purposes of obtaining a better carbide distribution state than the Cr8 type cold-work die steel, and ensuring that the material has better toughness. The content of elements Mn and Si is increased so as to improve the hardness and enhance the wear resistance. By adopting relatively high Nb<+>V composite alloying, the effects of V in the steel are increased, and the secondary hardening effect is improved.

Description

technical field [0001] The invention belongs to the technical field of die steel, and in particular relates to a high-toughness, high-wear-resistant cold-working die steel. It is suitable for blanking, stamping, cold heading, stretching, embossing die steel, and can also be used for tool and roll steel. Background technique [0002] Cold work die steel is mainly used to manufacture various dies for pressing and forming metal materials at room temperature, including blanking dies, drawing dies, bending and flanging dies, embossing dies, cold extrusion dies, cold heading dies, Rolling dies and powder pressing dies, etc. Since the processed object is a metal material and processed at room temperature, it has great difficulty in deformation. Cold work die steel is subjected to considerable compressive stress and friction during work, and must have relatively high hardness and wear resistance. In order to avoid fracture and chipping caused by impact loads, it should also have a...

AI Technical Summary

Problems solved by technology

However, due to the high content of C and Cr, the M 7 C 3 Eutectic carbides are developed, large in size, and severely segregated, so toughness will inevitably be lost

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