Thaum tshav kub kub tsis kam txhais tau hais tias stainless hlau tseem tuaj yeem tuav nws lub cev zoo thiab txhua yam khoom ntawm qhov kub thiab txias.
Cov nyhuv ntawm cov pa roj carbon: cov pa roj carbon yog ib yam khoom uas muaj zog tsim thiab ruaj khov austenite thiab nthuav dav austenite cheeb tsam hauv austenitic stainless hlau. Lub peev xwm ntawm carbon los tsim austenite yog li 30 npaug ntawm npib tsib xee. Raws li cov khoom sib txuam, cov pa roj carbon tuaj yeem txhim kho lub zog ntawm austenitic stainless hlau los ntawm kev txhim kho ntxiv zog. Cov pa roj carbon kuj tuaj yeem txhim kho qhov kev ntxhov siab thiab kev tiv thaiv corrosion ntawm austenitic stainless hlau hauv siab concentration chloride.
Txawm li cas los xij, hauv austenitic stainless hlau, carbon feem ntau suav tias yog cov khoom tsis zoo, uas feem ntau yog vim qhov tseeb tias nyob rau hauv qee qhov xwm txheej hauv kev tiv thaiv corrosion ntawm stainless hlau, carbon tuaj yeem tsim Cr23C6 hom carbon compound nrog siab chromium nrog chromium nyob rau hauv cov khoom siv. steel, yog li ua rau lub zos chromium depletion, uas txo cov corrosion kuj ntawm steel, tshwj xeeb tshaj yog tsis kam mus rau intergranular corrosion.
Yog li ntawd, feem ntau ntawm cov tshiab tsim Cr Ni austenitic stainless hlau txij li thaum 1960s yog ntawm ultra-low carbon hom nrog cov ntsiab lus carbon tsawg dua 0.03 feem pua lossis 0.02 feem pua. Nws tuaj yeem paub tias nrog kev txo qis ntawm cov ntsiab lus carbon, qhov cuam tshuam ntawm cov hlau rau intergranular corrosion txo. Qhov pom tseeb tshaj plaws yog thaum cov ntsiab lus carbon tsawg dua 0.02 feem pua. Qee qhov kev sim kuj tau taw qhia tias cov pa roj carbon kuj tseem yuav ua rau muaj kev nyiam ntawm pitting corrosion ntawm Cr Ni austenitic stainless hlau. Vim tias muaj kev phom sij ntawm cov pa roj carbon monoxide, tsis yog tsuas yog yuav tsum tswj cov ntsiab lus ntawm cov pa roj carbon tsawg li sai tau hauv cov txheej txheem austenitic stainless hlau smelting, tab sis kuj nyob rau tom qab kub, txias ua hauj lwm, kev kho cua sov thiab lwm yam txheej txheem los tiv thaiv carburization ntawm stainless hlau. deg thiab chromium carbide nag lossis daus.
