Micro-alloy chemical die steel and thermal treatment method thereof

Abstract

The invention discloses a micro-alloy chemical die steel and a thermal treatment method thereof. The chemical die steel comprises the following chemical components in percent by weight: 0.7 to 0.9 percent of C, 0.15 to 0.25 percent of V or Nb, 1.0 to 2.0 percent of Cr, Mn, Si and Mo, common steel with more than or equal to 50ppm of O, N, S and P, and less than 50ppm clean steel. The thermal treatment method for the steel comprises the following steps: heating the steel to between 1,050 and 1,150 DEG C after hot rolling to perform solution treatment, quickly cooling the steel to 600 DEG C, transferring the steel to a 400 to 700 DEG C furnace to perform isothermal transformation, heating the steel to between 900 and 950 DEG C after machining, quenching the steel by oil, and finally tempering the steel at the temperature of between 150 and 200 DEG C. The invention discloses the high-quality chemical die steel with low alloy element content, advantages of saving sources and reducing carbon emission and wide application prospect in die and bearing industries.

Description

technical field [0001] The invention relates to a novel tool and die steel and a heat treatment method thereof. Background technique [0002] Molds are becoming more and more important in the manufacturing industry. Using molds for production can not only greatly improve production efficiency, but also ensure the consistency of product quality. At present, the output value of the mold manufacturing industry has surpassed that of the machine tool manufacturing industry, which shows the important position of the mold industry in the manufacturing industry. [0003] Most of the molds are made of steel, so to improve the quality of the mold, the quality of the mold steel must be improved first, and the quality of the mold steel must be improved on the premise of saving resources and reducing carbon emissions. At present, my country is already the world's largest producer of die steel, but it is not yet a powerful country in die steel production. Every year, a large amount of h...

AI Technical Summary

Problems solved by technology

Because the quenching heating temperature is not high, although about 2% alloy elements are added, the hardenability is still limited, and the oil quenching diameter is only about 30mm

In the last two steel types, 9Mn2V and MnCrWV, although a small amount of V is added to prevent the growth of austenite grains, the role of V is not fully exerted because of incomplete quenching.

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