AISI 4140 Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C ) Equivalent Grades UNS number G41400 US name SAE H41400, SAE  4140, SAE 4142, SAE 4140, ASTM J  70, ASTM J  65, ASTM J  55, ASTM  4140, ASTM G41420, ASTM E7140, ASTM B7M, ASTM B16, ASTM 4142H, ASTM 4142, ASTM 4140H, ASTM 4140, ASTM … Continue reading AISI 4140 Low alloy steel (4100 Series, Cr-Mo Alloyed, 0.40% C ) | Equivalent Grades