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Abstract <p>Die steels with controlled austenitic transformation during operation (CATO) belong to a new class of tool steels. In CATO-type steels, the α → γ-transformation effect is realized during operation, ensuring their strengthening from deformation forces. Steel EP930 is the first of the CATO-type steels intended for operation in the austenitic state. In this work, data are obtained on its phase composition and mechanical properties under operating conditions in comparison with traditional die steel of high heat resistance 3Kh2V8F. It is found that at temperatures above 350°C, steel EP930 retains the structure of supercooled austenite for a long time, while in steel 3Kh2V8F γ → α transformation begins after a short-term holding at temperatures of 600°C and below. Steel EP930, compared to steel 3Kh2V8F, has a greater tendency to strain hardening at temperatures of 450–600°C.</p>

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Mechanical Properties of Die Steel EP930 at Elevated Temperatures

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • A. A. Kruglyakov

摘要

Abstract

Die steels with controlled austenitic transformation during operation (CATO) belong to a new class of tool steels. In CATO-type steels, the α → γ-transformation effect is realized during operation, ensuring their strengthening from deformation forces. Steel EP930 is the first of the CATO-type steels intended for operation in the austenitic state. In this work, data are obtained on its phase composition and mechanical properties under operating conditions in comparison with traditional die steel of high heat resistance 3Kh2V8F. It is found that at temperatures above 350°C, steel EP930 retains the structure of supercooled austenite for a long time, while in steel 3Kh2V8F γ → α transformation begins after a short-term holding at temperatures of 600°C and below. Steel EP930, compared to steel 3Kh2V8F, has a greater tendency to strain hardening at temperatures of 450–600°C.