ASTM A403 Kev siv yeeb nkab WPR304 khoov yog ua rau kom tsis txhob muaj mob kom tsis txhob muaj carburization, decarburization thiab teev nto. Kev kho cua sov yog kev ntxhov siab relieving, hardening thiab annealing thiab analing uas lub zog uas lub ductility thiab corrosion resistance cov yam ntxwv.