1. Ferritic steel phaj. Piv txwv li, 430, 434, 409 series stainless hlau.
2. Martensite steel phaj. Piv txwv li, 403, 414, 410, 416 series.
3. Austenitic steel phaj. Piv txwv li, 300 thiab 300 series.
4. Austenitic ferritic steel phaj. Piv txwv li, 410 thiab 300 series.
Ua ntej tshaj plaws, cov ntsiab lus chromium hauv ferritic steel phaj yog li 20 feem pua. Nws muaj corrosion kuj, siab toughness thiab weldability, thiab siab oxidation kuj. Nws yog tsuas yog siv rau kev ua cov khoom siv roj.
Qhov thib ob, cov ntsiab lus chromium hauv austenitic steel phaj yog ntau dua 18 feem pua, tab sis muaj ob peb tsawg dua 18 feem pua. Piv nrog rau lwm hom hlau phaj, nws muaj kev nkag siab zoo thiab muaj txiaj ntsig zoo hauv txhua yam, feem ntau yog siv rau kev ua cov kav dej thiab cov khoom siv tshuaj.
Thirdly, lub plasticity thiab weldability ntawm martensitic steel phaj yog qhov tsis zoo, tab sis nws lub zog yog zoo heev thiab nws cov khoom siv kho tshuab siab heev. Nws yog tsuas yog siv rau kev ua cov springs, tsheb hniav, thiab lwm yam.
Thaum kawg, austenitic ferritic steel phaj ua ke tag nrho cov khoom ntawm austenitic thiab ferritic steel daim hlau. Nws muaj tus nqi siab ua haujlwm piv. Nws qhov zoo tshaj plaws yog corrosion kuj thiab siab zog. Nws yog tsuas yog siv nyob rau hauv vuam, ncej thiab lwm yam teb.
