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5140 40cr Gr8.8 Alloy Steel Round Bar Bright Surface Steel for tools 1.5140 40cR Scr440 Gr8.8 steel bar Main standard GB JIS DIN ASTM/AISI/SAE 40Cr SCr40 41Cr4 5140 2.5140 40cR Scr440 Gr8.8 steel bar ...