Nyob rau tam sim no, muaj ntau cov kauv steel yeeb nkab tsim nyob rau hauv Suav teb, tab sis tag nrho cov tuam ntxhab yuav muaj teeb meem ntawm tsis yeem kauv steel yeeb nkab tsim tawm. Yog li no, thaum yuav khoom, nco ntsoov nug seb qhov sib txawv loj npaum li cas, tsis txhob cia li ntsia tsis pom tus nqi ntawm cov kauv ntsia hlau loj.
Qhov sib txawv ntawm lub teb chaws cov qauv kauv dav hlau yeeb nkab (GB / T9711-1997) rau cov diameters tsawg dua 508 yog 12.5% nce thiab nqis, thiab 10% nce thiab nqis rau 508 muab kauv steel yeeb.
Qhov sib txawv ntawm cov kauv sib xyaw steel kav hauv qab 508 (SY / T5037-2008) yog 12.5% ntawm cov kauv steel cov kav dej siab tshaj 508 thiab 10% ntawm cov kauv steel kav saum 508.
