Peb txhua tus paub tias stainless hlau welded kav yog resistant rau kub thiab corrosion, yog li dab tsilub cev muaj zog ntawm stainless hlau welded kav ntawm qhov kub thiab txias, Cia peb kawm ua ke!
Dab tsi yog lub cev lub cev ntawm stainless hlau welded kav ntawm qhov kub thiab txias?
Tsawg-kub embrittlement---Nyob rau hauv qhov kub thiab txias ib puag ncig, stainless hlau welded kav muaj me me deformation zog. Nyob rau hauv ib cheeb tsam uas tsis kub, qhov tshwm sim ntawm txo elongation thiab cheeb tsam txo yog hu ua low-temperature embrittlement. Qhov kub-kub embrittlement no tshwm sim nyob rau hauv feem ntau ferritic series stainless hlau.
Austenitic series stainless hlau kav muaj qhov kub thiab txias (Subzreo kub) Ms point (martensite transformation pib kub lossis martensite tsim kub), yog li thaum khaws cia qis dua Ms point, martensite tuaj yeem tsim tau. Kev tsim ntawm martensite ntawm qhov kub qis ua rau SUS304 (18Cr-8Ni), tus sawv cev steel hom stainless hlau seamless kav, uas tsis yog-sib nqus nyob rau hauv chav tsev kub, tab sis dhau los ua hlau nplaum nyob rau hauv qhov kub thiab txias.
Hais txog qhov kub thiab txias, cov kav dej ferritic stainless hlau muaj qhov kub thiab txias zoo li carbon hlau, tab sis austenitic hlau tsis yog. Yog li ntawd, ferritic los yog martensitic stainless hlau tsim cov kub kub embrittlement, thaum austenitic stainless hlau welded kav los yog npib tsib xee-raws li alloys tsis qhia low-temperature brittleness. Ferritic stainless hlau kav xws li SUS410 (13Cr) thiab SUS430 (18Cr) qhia qhov poob qis hauv qhov cuam tshuam ntawm qhov kub thiab txias. Yog li ntawd, nws yuav tsum tau them nyiaj tshwj xeeb thaum siv nws ntawm qhov kub thiab txias. Raws li ib txoj hauv kev los txhim kho qhov cuam tshuam toughness ntawm ferritic series stainless hlau, cov txheej txheem purification siab tuaj yeem txiav txim siab. Los ntawm kev tswj cov qib C, thiab N, nws muaj peev xwm siv tau rau hauv cov haujlwm khov kho thaum lub embrittlement kub tau txhim kho nyob rau hauv thaj tsam ntawm -50 degree rau -100 degree .
Txawm li cas los xij, kev saib xyuas yuav tsum tau them rau qhov nyiam ntawm ferrite rau precipitate los yog martensite kom precipitate vim kev ua, thiab kuj tseem muaj kev nyiam ntawm embrittlement vim heterogeneous nag lossis daus ntawm carbides los yog σ theem vim rhiab heev. Cov saum toj no yoglub cev muaj zog ntawm stainless hlau welded kav nyob rau hauv qis-kubtej yam kev mob.
