Iityhubhu zentsimbi eziSeamiess zokuqhekeka kwepetroleum
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Iityhubhu zentsimbi ezingenamthungo zokuqhekeka kwePetroleum, GB9948-2006, iSanon Pipe
Iityhubhu zentsimbi ezingenamthungo zokuqhekeka kwepetroleum, ezifakwe njengeetyhubhu zefumace, iityhubhu zokutshintshiselana ngobushushu kunye
imibhobho yepetroleum kunye nezityalo zokucoca.Umgangatho ophezulu wekhabhoni wolwakhiwo lwentsimbi amabakala angama-20g,
I-20mng kunye ne-25mng; i-alloy yesakhiwo sentsimbi: 15mog, 20mog, 12crmog, 15CrMoG, 12Cr2MoG, 12CrMoVG, njl.
