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Description Standard AiSi, ASTM, BS, DIN, GB, JIS Grade NM360,NM400, NM450, NM500, NR360, NR400B-HARD360, B-HARD400, B-HARD450,KN-55,KN-60KN-63, Mn13 HARDOX400, HARDOX450, HARDOX500,HARDOX600XAR400...