I-stainless steel sandcastings yimikhiqizo yokubunjwa kwensimbi ensimbi encibilikisiwe engagqwali ephonswa inqubo yokusakazwa kwesihlabathi. Insimbi engagqwali isifinyezo sensimbi engagqwali ne-acid-resistant. Ibizwa ngensimbi engagqwali ekwazi ukumelana nemithombo yemali ebolayo ebuthakathaka njengomoya, isitimu, namanzi. Insimbi yokugqwala ibizwa ngokuthi insimbi engamelana ne-asidi. Ngenxa yomehluko ekwakhekeni kwamakhemikhali phakathi kwensimbi engagqwali evamile nensimbi engamelana ne-asidi, ukumelana kwazo nokugqwala kwehlukile. Insimbi engagqwali evamile ngokuvamile ayimelani nokugqwala kwemithombo yamakhemikhali, kuyilapho insimbi emelana ne-asidi ngokuvamile ayigqwali. Igama elithi "insimbi engagqwali" alibhekiseli nje kuphela ohlotsheni olulodwa lwensimbi engagqwali, kodwa futhi libhekisela ezinsimbi ezingenasici zezimboni ezingaphezu kwekhulu. Insimbi engagqwali ngayinye ethuthukisiwe inokusebenza okuhle emkhakheni wayo wesicelo othize.
