Reasonableness discussion on hardness upper limit of normalized and tempered T22 steel tubes specified in ASME SA-213M

doi:10.13251/j.issn.0254-6051.2021.03.046

Abstract

Abstract: Simulated normalized and tempered tests with different parameters for T22 steel tubes were performed. The results show that it is very easy for hardness of normalized and tempered T22 steel tubes to exceed the hardness upper limit (163 HBW/170 HV/85 HRB) specified in ASME SA-213M standard, and it is difficult to avoid the spheroidizing microstructure even if the hardness constrainedly reduced to below the hardness upper limit according to special heat treatment parameters, and it is believed that the raising of hardness upper limit for normalized and tempered T22 steel tubes shall be considered. Meanwhile, the suitable raising extent of hardness upper limit is discussed, and further suggestions are that the hardness upper limit for normalized and tempered T22 steel tube specified in SA-213M should be raised from 163 HBW/170 HV/85 HRB to 179 HBW/190 HV/89 HRB.

Key words: T22 steel, ASME SA-213M standard, hardness upper limit, discussion

CLC Number:

TG142.1⁺2

Lai Xianhong, Zeng Hui, Yang Huachun, Zhang Wei. Reasonableness discussion on hardness upper limit of normalized and tempered T22 steel tubes specified in ASME SA-213M[J]. Heat Treatment of Metals, 2021, 46(3): 239-242.

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