Khoom siv:
dav siv hauv tshuab, khoom siv kho mob, khoom siv dag zog, Qizheng, tsheb ciav hlau ceev, tsheb, rooj tog, kho kom zoo nkauj thiab lwm yam.
Kev ua raws li tus qauv:
| ASTM A554 Cov Lus Qhia Tshwj Xeeb |
| GB/T 12770 |
| JIS G3446 |
| TIAB SA 3030 |
| TIAB SA 5363 |
