Kune iyo ASTM yakajairwa, zvinhu zvakasiyana zvine giredhi resimbi rakasiyana, kunze kwekunge iwo ma mechanic zvimiro uye chimiro chemakemikari, metallurgical properties zvese zvakasiyana. Kune rondedzero yeastm standard ine akasiyana simbi giredhi. ASTM A53 / A53M Yakajairwa Kutsanangurwa kwePipe, Simbi, Bla...
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