Amashubhu ensimbi angenamthungo okuqhekeka kwe-petroleum, afakwe njengamashubhu e-fumace, amashubhu okushintshanisa ukushisa kanye
amapayipi ezitshalweni zikaphethiloli kanye nezokuhluza.Amabanga aphezulu ensimbi ye-carbon structural angama-20g,
20mng kanye 25mng; Ingxubevange amamaki ensimbi yesakhiwo: 15mog, 20mog, 12crmog, 15CrMoG, 12Cr2MoG, 12CrMoVG, njll