浅析微冷塑性变形与低温退火协同提升321H奥氏体不锈钢锅炉管屈服强度及晶粒度稳定性

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中图分类号：TG156 文献标识码：B 文章编号：1003-0514（2025）06-0032-03

Analysis of synergistic enhancement of yield strength and grain size stability in 321H austenitic stainless steel boiler tubes through micro-cold plastic deformation and lowtemperature annealing

Li Jigang

（Pengye Holding Group Co.，Ltd，Songyang 3234Oo，Zhejiang，China）

Abstract：The 321Haustenitic stainless steel high-temperature boiler tubesare confronted with the challenge of synergisticalyregulating the yieldstrengthand grain sizeundersolutiontreatment.Experimental validationreveals that while high-temperature solution treatment mets grain sizerequirements，the yield strength generallylowerthan 2O5 MPa.On the otherhand，low-temperaturesolutiontreatmentenhances strength toover2O5MPa，butitesultsingrainrefinement.Inhis study，a novel method is proposed， which applies the composite strengthening process of "introducing 0.5% to 3% micro cold plasticdeformationafterhigh-temperaturesolutiontreatment，folowedbylow-temperature short-termannealing"tostainless steel seamless tubes，whicheliminates residual stressthroughdislocation strengthening.While maintaining grainsizeatgrade 4～7，this method significantly increases the yield strength Rp0.2 to 230～28O MPa， with the elongation after fracture more than 35% ，andthe hardness less than 9OHRB，which is qualified with thestandards’requirement.This innovation resolves the issueof insuficient strengthin high-temperature solution-treated materials，and provides anew way whichcapableof saving production costs for boiler tube manufacturing.

Key words：321Haustenitic stainlesstel；boiler tube；micro-cold plastic deformation；low-temperature anealing; yield strength；grain size；substructure strengthening

0前言

奥氏体不锈钢321H因其优异的耐高温氧化性、抗蠕变性能、焊接性及良好的成形性，被广泛应用于超临界、超超临界电站锅炉的过热器、再热器等高温承压部件。（剩余2628字）