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AISI 4130 AISI 4140 AISI 4145HM AISI 410 AISI 8630HM ASTM A182 F22 ASTM A350 LF2 ASTM A564 Gr.630 (17/4PH) 905M39 722M24 Stainless Steels Nickel Alloys Home Page AISI 4140 (~42CrMo4 / SIS 2244 / 42CD4) Rolled Bar Heat Treated and Tested 18-22 HRC (207-235 BHN), 80K min yield, NACE MR0175 & API 6A PSL3. Size Range:- Ø32mm to Ø290mm AISI 4140 (~42CrMo4 / SIS 2244 / 42CD4) Forged Annealed Bar Size Range:- Ø250mm to Ø645mm