Kev xaiv ntawm stainless hlau vuam cov ntaub ntawv feem ntau ua raws li txoj cai "homogeneity".
1. Ferritic stainless hlau: Yog hais tias nws yog rhuab ntawm 430-480 degree rau lub sij hawm ntev thiab txias maj mam thaum vuam, nws yuav yooj yim tsim 475 degree brittleness, thiab impurities yuav ua lub luag hauj lwm catalytic. Vuam txheej txheem yog pom zoo kom tsis tshua muaj tam sim no, vuam ceev, tsis muaj viav vias, thiab qis interlayer kub rau multilayer vuam.
2. Martensitic stainless hlau: Lub embrittlement ntawm HAZ thiab txias tawg thaum lub sij hawm vuam yuav tsum tau zam kom ntau li ntau tau thaum vuam. Feem ntau, sib txuas ua ntej-weld (150-300 degree C) thiab kev kho cua sov tom qab vuam (700-750 degree C) ntsuas. Siv lub zog hlau loj dua, yog tias tsim nyog, siv cov khoom siv austenitic vuam.
3. Austenitic stainless hlau: Qhov cuam tshuam ntawm kub tawg thiab intergranular corrosion yog thawj qhov kev txiav txim siab thaum vuam hom stainless hlau. Raws li nws cov yam ntxwv ntawm lub cev, me me linear zog yuav tsum tau siv rau vuam, ceev ceev txias, thiab tswj thaum lub sij hawm multilayer vuam. Tsawg interlayer kub. Siv zog kom muaj qhov tsim nyog ntawm ferrite nyob rau hauv lub vuam kom tiv thaiv qhov tshwm sim ntawm kub tawg. Hauv kev lag luam petrochemical, xws li hydrogenation reactors thiab lwm yam khoom siv, tus naj npawb ntawm ferrites (FN) nyob rau hauv cov vuam yog qhia meej meej, thiab feem ntau yuav tsum tau 3-10.
4. Duplex stainless hlau: Piv nrog austenitic steel, nws muaj qhov qis dua qhov tawg; piv nrog ferritic steel, nws muaj qis embrittlement tom qab vuam, yog li nws muaj weldability zoo heev thiab tsis tshua muaj kev sib tsoo vuam. Txawm li cas los xij, muaj kev nyiam rau cov qoob loo loj hlob thaum lub caij kub kub. Thaum lub sij hawm welding, cov kab tsim nyog zog thiab interlayer kub yuav tsum tau saws los tswj cov qauv dual-theem tom qab vuam. Nyob rau hauv luv luv, duplex stainless hlau muaj zoo weldability. Txawm hais tias nws cov crystals solidified yog ib-theem ferrite, nyob rau hauv cov kev txwv dav dav, qhov rhiab heev ntawm cov hlau weld rau thermal tawg yog tsawg heev. Nws qhov txias tawg rhiab heev kuj tsawg heev. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias tom qab tag nrho, duplex stainless hlau muaj siab ferrite. Thaum cov qib kev tswj hwm siab thiab cov ntsiab lus hydrogen ntawm cov hlau welding siab, kuj tseem muaj qhov txaus ntshai ntawm cov kab nrib pleb vim qhov tawg. Yog li ntawd, lub hauv paus ntawm hydrogen yuav tsum tau tswj nyob rau hauv kev xaiv ntawm vuam cov ntaub ntawv thiab vuam txheej txheem.
5. Cov nag lossis daus hardening stainless hlau: Vim nws cov hardness siab, tsis zoo toughness thiab plasticity, thiab loj welding residual kev nyuaj siab, nws yog ib qho yooj yim los tsim cov kab nrib pleb. Cov txheej txheem vuam zoo ib yam li martensitic stainless hlau tau pom zoo, tab sis qhov kub thiab txias yuav tsum tau nce ntxiv.
