Effect of normalizing rolling and subsequent normalizing process on microstructure and properties of S460NL high-strength low-temperature structural steel

doi:10.13251/j.issn.0254-6051.2021.09.025

Abstract

Abstract: Based on EN10025-3 standard, the chemical composition of the normalized high-strength low-temperature structural steel S460NL was designed with medium carbon, low phosphorus, sulfur, nitrogen and hydrogen; then through high-homogeneous smelting and continuous casting process, the steel plates with different specifications were produced respectively by normalizing rolling and by normalizing rolling+normalizing. The results show that the steel plates by normalizing rolling process can meet the performance requirements of EN10025-3 standard and EN10164 Z35 standard for the S460NL steel plates with specifications below 60 mm, while for that 60 mm and above, additional normalizing process is required to meet such performance requirements. The normalizing-rolled+normalized S460NL steel plates have excellent tensile properties and excellent impact properties at －50 ℃ after PWHT simulated post welding heat treatment, which meets the standard requirements.

Key words: S460NL steel, normalizing process, low-temperature structural steel

CLC Number:

TG142

Pan Zhongde, Zhang Pengcheng, Wu Huibin, Hu Qilong. Effect of normalizing rolling and subsequent normalizing process on microstructure and properties of S460NL high-strength low-temperature structural steel[J]. Heat Treatment of Metals, 2021, 46(9): 142-145.

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