Hot work die steel and production method thereof

Abstract

The invention discloses a hot work die steel and a production method thereof. The steel contains 0.45% to 0.55% of C, 5.50% to 6.50% of Cr, 0.85% to 1.10% of Si, 0.30% to 0.50% of Mn, 1.20% to 1.50% of Mo, 0.60% to 1.00% of V, less than or equal to 0.013% of P, less than or equal to 0.03% of S, 0.15% to 0.25% of Gd, 0.10% to 0.15% of La, 0.10% to 0.15% of Y, and the balance of Fe and unavoidable impurities. According to the invention, electric furnace smelting is carried out, the billet heating temperature is 1200-1280 DEG C, heat preservation is carried out for 2-4h, the rolling temperature is 1150 -1250 DEG C the finishing temperature is 820-950 DEG C, the cooling rate is 5 to 10 DEG C / s, and the final cooling temperature is 400 to 550 DEG C. The first-stage isothermal annealing temperature is 830-880 DEG C; the second-stage isothermal annealing temperature is 730-780 DEG C; the quenching temperature is 1050 to 1150 DEG C, and the tempering temperature is 550 to 650 DEG C. The produced hot work die steel has high isotropic performance and impact resistance.

Description

technical field [0001] The invention belongs to the field of high-alloy steel production, in particular to a hot work die steel material with high isotropy and impact resistance. Background technique [0002] Today, my country's mold industry is developing rapidly, and the proportion of mold manufacturing in China is gradually increasing worldwide, and the consumption of mold steel is also increasing significantly. As an important part of die steel, hot work die steel has made great progress in recent years, but its service conditions are very harsh, the content of alloy elements is high, and its structure is relatively complex, so the requirements for its performance are more stringent. [0003] At present, there are problems such as single performance and short service life in the application of conventional die steels. In order to improve the comprehensive performance of hot work die steels, rare earth elements can be added to improve the composition, distribution, and mo...

AI Technical Summary

Problems solved by technology

By adding Y and Ce, the grains are refined, harmful elements such as oxygen and sulfur in molten steel are purified, the shape, size and distribution of inclusions are changed, and segregation is reduced, thereby greatly improving the impact toughness and Anti-fatigue and anti-oxidation corrosion performance; after adding rare earth elements, although the hardness of hot work die steel is slightly improved, its hardness and horizontal and vertical performance ratio still cannot meet the strict requirements of high-quality hot work die steel

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