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AISI 4340 34CrNiMo6 40NCD3 SNCM439 Gear Shaft Blank Q+T Heat Treatment Rough Turned Standards: GB:40CrNiMoA DIN:36CrNiMo4 JIS:SNCM439 BS:816M40 NF:40NCD3 AISI/ASTM:4340 AS:1444-4340 UNS:G43400 ...