Nyob rau hauv xyoo tsis ntev los no, lub saum npoo ntxiv dag zog (moisturizing) ntawm cov khoom siv sib txawv, thiab cov qauv tshiab ntxiv dag zog rau cov khoom siv sib txawv Carburizing, carbonitrivate, nitriving thiab lwm cov txheej txheem tseem ceeb rau kev txhim kho cov kev coj ua kom muaj zog hauv ntau qhov chaw ua haujlwm ntawm ntau qhov chaw. Tsis tas li ntawd, casting cov txheej txheem xws li casting infiltration thiab composite casting kuj tau siv nyob rau hauv kev tsim cov khoom ntawm cov khoom siv-resistant steel seem.