Ntiv nplhaib txiv ntoo sib xyaw rau forging, thiab tom qab normalizing kev kho thiab tshem tawm cov tawv nqaij oxide; Kev zam txim yam tsis muaj dhau - hlawv, tawg tsis xws luag; Ntiv nplhaib txiv ntseej yog kuaj tsis sib thooj hardness, Daim Ntawv Thov: Lifting Fittings