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AISI ASTM 1050 JISS50C DIN CK53 BS060A52 XC 48TS Carbon Steel Forgings Rings Forging 3.1Certificate 1. Standards: GB50 ASTM1050 AISI1050 XC48TS JIS S50C DIN Ck53 EN C50 BS060A52 2. Heat Treatment: ...