Low-cost, high-strength, high-toughness and high-abrasion resistance cold-working die steel and preparation method thereof

Abstract

The invention relates to a low-cost, high-strength, high-toughness and high-abrasion resistance alloy steel and a preparation method thereof. The invention belongs to the technical field of preparation technologies of special alloy steel. The alloy steel comprises the following elements by weight percent: 0.88-1.10% of C, 0.45-0.65% of Si, 0.20-0.50% of Mn, 7.50-9.0% of Cr, 1.30-1.80% of Mn, 0.30-0.60% of V and the balance of Fe. The preparation process comprises the following steps: (1) preparing materials and melting by using the conventional method, wherein the melting temperature is 1500-1550 DEG C; (2) carrying out electro-slag re-melting; (3) annealing after the electro-slag re-melting; (4) forging; (5) annealing after the forging, and annealing at the temperature of 850-880 DEG C for 8 hours; (6) carrying out shpheroidizing annealing to 860-550 DEG C; and (7) carrying out the heat treatment technology, adopting the low temperature quenching and low temperature tempering or high temperature quenching and high temperature tempering technology for carrying out heat treatment, and finally preparing the high-strength, high-toughness and high-abrasion resistance cold-working die steel. The hardness of the die steel is 62-63HRC and the average impact toughness is 80J. Compared with the imparted steel, the alloy steel has the equivalent hardness and toughness, and can completely replace the imported high-strength, high-toughness and high-abrasion resistance cold-working die steel.

Description

technical field [0001] The invention relates to a low-cost, high-strength, high-toughness, high-abrasion resistance cold working die steel and a preparation method thereof. The invention belongs to the field of special alloy steel manufacturing technology. Background technique [0002] Cold work die steel is mainly used to manufacture molds that are pressed and formed under cold (room temperature) conditions, such as cold drawing dies, cold heading dies, cold extrusion dies, embossing dies, rolling dies, etc. The working conditions of the cold work die are somewhat similar to the cutting tool, but because the processed material is deformed in the cold state, the deformation resistance is very large. Compared with cutting tool steel, cold work die steel should require higher hardenability, wear resistance and toughness, while the requirement for red hardness can be lower. Generally, the temperature rise of cold work die steel will not exceed 200-300 °C . [0003] For a lon...

AI Technical Summary

Problems solved by technology

[0005] In the past, my country's high-end high-strength and tough cold-work die steel mainly relied on imports, but due to the high price of imported steel, the cost of my country's cold-work die production enterprises increased or some companies continued to use low-end die steel, resulting in low production efficiency. The lack of international and domestic competitiveness of enterprises has also caused a waste of a lot of resources in our country

Images