Microstructure and properties of nitrogen-containing corrosion-resistant die steel TM420

doi:10.13251/j.issn.0254-6051.2021.05.028

Abstract

Abstract: Hardness, grain size, microstructure, mechanical properties and pitting corrosion resistance of the nitrogen-containing corrosion-resistant die steel TM420 under different heat treatment conditions were studied. The results show that the microstructure of the TM420 steel after annealing is mainly ferrite+carbide, and generally does not contain δ ferrite. Compared with traditional corrosion-resistant die steel, the TM420 steel has better hardenability, and the pre-hardened specimen has better strength and toughness and pitting corrosion resistance. The TM420 steel has a wide quenching and tempering temperature range and excellent tempering stability, the recommended quenching temperature range is 980-1060 ℃, and the pre-hardening tempering temperature range is 580-650 ℃.

Key words: corrosion-resistant die steel, quenching, tempering, mechanical properties, pitting resistance

CLC Number:

TG142.1

Chen Jianli, Zhang Xiaokun, Chu Baoshuai, Zhang Jinwen. Microstructure and properties of nitrogen-containing corrosion-resistant die steel TM420[J]. Heat Treatment of Metals, 2021, 46(5): 171-174.

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