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GCr15 / EN31 / SUJ2 / SAE52100 / 100Cr6 Hot Rolled Steel Rod for Making Axle 1. Similar Grade: EN31, SAE52100, GCR15, SUJ2, 100Cr6 2. Main standard: GB JIS DIN ASTM/AISI/SAE GCr15 SUJ2 100Cr6 52100 3...