Cov qeb ntawm cov khoom siv hlau
Cov khoom siv hlau tau muab faib ua rau 6 pawg:
(1) P-steel
(2) M- stainless hlau
(3) K-cam khwb cia hlau
(4) N-non-ferrous hlau
(5) S- tshav kub-resistant alloy
(6) H-hardened hlau
Cov khoom siv hlau tau muab faib ua rau 6 pawg:
(1) P-steel
(2) M- stainless hlau
(3) K-cam khwb cia hlau
(4) N-non-ferrous hlau
(5) S- tshav kub-resistant alloy
(6) H-hardened hlau
