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SAE5140 40Cr 1.7035 SCR440 Hot Rolled Steel Bar of Special Steel Chemical composition(%): Si Mn S P Cr Ni Cu 0.17-0.37 0.70-0.90 <=0.040 <=0.035 0.70-0.90 <=0.30 <=0.30 Application: ASTM5140 is the ...