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Invention Patent
JP2021178994A Fe基合金管および溶接継手 审中-公开

Fe基合金管および溶接継手
Abstract:
【課題】溶接後の熱処理を行うことなく、管の内面側ビード近傍に生じる割れを抑制しうるFe基合金管および溶接継手を提供する。 【解決手段】化学組成が、質量%で、C:0.040〜0.100%、Si:0.10〜1.00%、Mn:0.60〜1.60%、P:0.030%以下、S:0.0001〜0.0015%、Ni:29.5〜35.5%、Cu:0.01〜0.75%、Co:0.01〜1.00%、Cr:19.0〜23.0%、Mo:0.01〜1.00%、Ti:0.10〜0.60%、N:0.0010〜0.0150%、Al:0.10〜0.60%、O:0.0004〜0.0150%、残部:Feおよび不純物であり、[0.0010≦S+2O≦0.0280]を満足する、Fe基合金管。 【選択図】図1
Abstract(English):

To provide an Fe-based alloy pipe that can prevent cracking near a bead on the inner side of the pipe without the need for heat treatment after welding, and a weld joint.SOLUTION: An Fe-based alloy pipe has a chemical composition consisting of, in mass%, C: 0.040-0.100%, Si: 0.10-1.00%, Mn: 0.60-1.60%, P: 0.030% or less, S: 0.0001-0.0015%, Ni: 29.5-35.5%, Cu: 0.01-0.75%, Co: 0.01-1.00%, Cr: 19.0-23.0%, Mo: 0.01-1.00%, Ti: 0.10-0.60%, N: 0.0010-0.0150%, Al: 0.10-0.60%, O: 0.0004-0.0150%, with the balance being Fe and impurities, and satisfies [0.0010≤S+2O≤0.0280].SELECTED DRAWING: Figure 1

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