Rau ASTM tus qauv, cov khoom sib txawv nrog qib steel sib txawv, ib qho ntxiv, lawv cov khoom siv kho tshuab thiab tshuaj lom neeg muaj pes tsawg leeg, cov khoom siv hlau yog txhua yam sib txawv. Muaj cov npe rau astm tus qauv nrog qib steel sib txawv. ASTM A53 / A53M Txuj Specification rau Yeeb Nkab, Hlau, Bla ...
Nyeem ntxiv