High-grade hot work die steel with high performance and manufacturing method of high-grade hot work die steel

Abstract

The invention provides high-grade hot work die steel with high performance. The die steel mainly comprises, by weight percent, 0.32%-0.41% of C, 0.2%-0.6% of Si, 0.6%-0.9% of Mn, 2.5%-4.5% of Cr, 2.5%-3.5% of Mo, 0.5%-1.1% of V, smaller than 0.02% of P, smaller than 0.0005% of S, and the balance Fe. The die steel has excellent high-temperature strength, temper resistance and heat conductivity performance, the structure AS1 grade in the NADCA#229-2011 standard can be obtained, the oxygen and sulfur content is lower than 10 ppm, and the ballistic work of the die steel is higher than H13 die steel by 30% under high hardness.

Description

Technical field [0001] The invention relates to a steel forging and heat treatment process technology, in particular to a high-grade hot work die steel with excellent high-temperature strength, tempering stability and thermal conductivity, and a manufacturing method thereof. Background technique [0002] Molded parts have a series of advantages such as high production efficiency, good quality, saving materials and costs, and a wide range of applications. Hot forging die steel is an important type of die material. Because hot forging is in service with the metal blank at 1000°C for a long time, it can withstand huge extrusion force, punching force, bending force, friction and thermal shock alternating stress, etc. Complex effects, which require hot forging die steels to have good strength and toughness, cold and hot fatigue properties, and high temperature thermal stability. [0003] H13 die steel is one of the most commonly used hot forging die steels. It was first developed by th...

AI Technical Summary

Problems solved by technology

Main features of H13 die steel: 1) moderate wear resistance; 2) low hardness; 3) the use of conventional carburizing or nitriding process will increase its surface hardness, but its thermal cracking resistance will be reduced; 4) it contains The carbon content is low, resulting in poor secondary stress ability; 5) It has softening resistance at moderate temperatures, but the use temperature is higher than 540°C (1000°F), and the hardness drops rapidly (that is, the working temperature of the ability is 540°C) ; 6) The deformation of heat treatment is small; (7) Machinability is general; 8) Anti-decarburization ability is general

[0004] With the widespread application of high-speed, high-load, high-precision die forging equipment and high-strength toughness forgings, the service conditions of hot forging dies are more severe. During the production process of H13 die steel, various failure modes are caused due to various reasons, such as large changes in high-temperature strength, Poor fire stability, low thermal conductivity, low hardenability, impact toughness, etc., so it is necessary to improve the composition of H13 die steel to solve the problems existing in H13 die steel

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