Feem ntau siv cov qib yog plaub qib ntawm 302, 303, 304, thiab 305, uas yog li "18-8" austenitic stainless hlau qib. Ob leeg corrosion kuj thiab mechanical zog zoo sib xws. Lub taw tes pib rau kev xaiv yog kev tsim cov txheej txheem ntawm cov hlau tsis muaj qab hau, uas tig los nyob ntawm qhov loj me thiab cov duab ntawm cov hlau tsis huv, thiab kuj ua rau kom muaj nuj nqis.