Microalloyed mold steel with high purity and preparation method thereof

Abstract

Provided are microalloyed mold steel with high purity and a preparation method thereof. The microalloyed mold steel is prepared from, by weight percent, 0.38%-0.48% of C, 1.50%-2.00% of Si, 0.60%-0.80% of Mn, not larger than 0.015% of P, not larger than 0.015% of S, 4.80%-5.80% of Cr, 0.60%-0.90% of Mo, 0.70%-1.00% of W, 0.03%-0.08% of Nb, 0.005%-0.015% of Sr, 0.002%-0.008% of Ca and the balance Fe and inevitable impurities, wherein Sr+Ca is larger than or equal to 0.01%. According to the microalloyed mold steel with high purity and the preparation method thereof, microalloyed ingredients aredesigned, a proper process is used in cooperation, and therefore excellent comprehensive performance and an efficient production process are achieved, and the high-quality mold steel excellent in comprehensive performance, short in production period and low in cost is obtained.

Description

technical field [0001] The invention belongs to the technical field of metal material production, and in particular relates to a high-purity microalloyed die steel and a preparation method thereof. Background technique [0002] The mold industry, known as the "mother of manufacturing", has flourished domestically as China has gradually developed into a global manufacturing center over the past three decades. With the transformation and upgrading of China's manufacturing industry, high-end mold manufacturing has become the development direction of many domestic mold manufacturing companies. For high-end mold manufacturing practitioners, the most important part is to choose high-quality mold steel as raw material to obtain mold design performance. [0003] Hot work tool steel is one of the fastest consuming and most demanding tool steels. Hot work die steel requires materials with high hardenability, high high temperature strength, high wear resistance, high toughness, etc. ...

AI Technical Summary

Problems solved by technology

Add Mo and V at the same time, and the content of Mo element is high, and the alloy cost is high

Using 5-10h high temperature homogenization treatment and forging solution treatment, the production cycle is long and the cost is high

[0009] Patent application number CN201510776761.0 "A Preparation Method for Improving the Properties of 4Cr5MoSiV1 Hot Work Die Steel" adds pure rare earth La and Ce under oxygen-controlled conditions, diffuses and homogenizes annealing, three-dimensional upsetting and elongating forging, After forging, the water and air dual media are alternately cooled quickly, and the obtained 4Cr5MoSiV1 hot work die steel has a stable tempered structure and excellent isotropy, but it is difficult to ensure thermal stability

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