1. Q: Dab tsi yog "pib teem caij" (SCH) hais txog?
A:Nws yog kev lag luam tus qauv tsim rau lubphab ntsa thicknesso cev. Rau qhov muab cov yeeb nkab nominal loj (NPS), tus lej teem sijhawm siab dua (piv txwv li, SCH 80 vs. SCH 40) qhia tiasphab ntsa tuabthiab yog li kev ntsuas siab dua. Cov sij hawm muaj xws li SCH 5S, 10S, 40S, thiab 80S rau stainless hlau -7.
2. Q: Koj puas tuaj yeem piav qhia qhov tseem ceeb ntawm UNS tus lej zoo li N08367 hauv cov yeeb nkab tshwj xeeb?
A:UNS (Unified Numbering System) cov lej muab cov cim tshwj xeeb thiab tsis paub meej rau cov hlau thiab hlau.UNS N08367yog ib qho kev xaiv tshwj xeeb rau siab - alloy austenitic stainless hlau (feem ntau hu ua AL-6XN®), nrog cov ntsiab lus molybdenum thiab nitrogen siab, siv rau nws qhov tshwj xeeb tiv thaiv dej hiav txwv corrosion. Cov qauv zoo li ASTM B804 tshwj xeeb npog welded yeeb nkab hauv qib -4.
3. Q: Dab tsi yog "heat- thaj chaw cuam tshuam" (HAZ) thiab vim li cas nws tseem ceeb?
A:Lub HAZ yog thaj tsam ntawm lub hauv paus hlau nyob ib sab ntawm lub weld uas tsis yog melted tab sis nwsmicrostructure thiab mechanical zog tau hloov pauv los ntawm vuam cua sov. Nws feem ntau yog qhov tsis muaj zog tshaj plaws ntawm kev sib koom ua ke, uas muaj peev xwm raug kev txom nyem los ntawm kev loj hlob ntawm cov qoob loo, tawv tawv, lossis tsis muaj zog, ua rau nws muaj kev cuam tshuam rau kev tawg -2-10.
4. Q: Dab tsi ua rau "tsis muaj fusion" tsis xws luag hauv ERW kav dej?
A:Tsis muaj fusion (los yog txias weld) tshwm sim thaum ob lub npoo ntawm lub sawb tsis zoo thaum lub sij hawm vuam txheej txheem. Ua rau muaj xws liwelding kub tsis txaus, tsis txaus nyem quab yuamlos ntawm rolls, los yogkev kis kab mobnyob rau ntawm kab npoo. Nws yog ib qho teeb meem tseem ceeb vim nws tsim kev tsis sib haum xeeb hauv cov yeeb nkab phab ntsa -6.
5. Q: Lub hom phiaj ntawm kev tshaj tawm -weld heat treatment (PWHT) yog dab tsi?
A:PWHT tau ua kom txo qisresidual stressesqhia los ntawm vuam, rautemper nyuaj microstructures(zoo li martensite) nyob rau hauv HAZ, thiab txhim kho qhov seem stability. Nws yog feem ntau yuav tsum tau rau cov phab ntsa tuab, rau tej yam siab -lub zog los yog creep- qib resistant, los yog thaum vuam cov khoom sib txawv.
