Seamless steel yeeb nkab rau tsheb, seamless steel yeeb nkab rau cov qauv
hlau loj
10 ~ 45, 16Mn, 20CrMo ~ 42CrMo
txheej txheem ntau lawm
GB8162 Seamless steel raj rau cov qauv
ASME SA519 "Carbon steel yeeb nkab thiab alloy-steel raj rau seamless qauv"