A kind of high-purity microalloyed die steel and its preparation method

Abstract

A microalloyed die steel with high purity and its preparation method, the weight percent of its chemical composition is: C 0.38%-0.48%, Si 1.50%-2.00%, Mn 0.60%-0.80%, P≤0.015%, S≤0.015%, Cr 4.80%‑5.80%, Mo 0.60%‑0.90%, W 0.70%‑1.00%, Nb 0.03%‑0.08%, Sr 0.005%‑0.015%, Ca 0.002%‑0.008%; where Sr+ Ca≥0.01%, the balance is Fe and unavoidable impurities. The invention designs a kind of microalloying composition, which is equipped with appropriate technology, so that it has excellent comprehensive performance and efficient production process, and obtains high-quality mold steel with excellent comprehensive performance, short production cycle and low cost.

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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