1. I-Material: Insimbi evamile ye-carbon structural steel (amandla esivuno se-Q), insimbi yekhwalithi ephezulu ye-carbon structural (enengxenye ye-carbon mass engu-20/10000), i-alloy structural steel (enengxenyana ye-manganese eyisilinganiso engaba ngu-2% ku-20Mn2), insimbi ecijile (ZG230-450 isivuno esingekho ngaphansi kwamaphoyinti angu-230...
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