Can you flame harden 4140?

Pre hardened and tempered 4140 can be further surface hardened by flame or induction hardening and by nitriding.Click to see full answer. Also to know is, can you case Harden 4140? Re: Case hardening 4140 steel 4140 can be safely color cased hardened by lowering the temperature at quench to 1375 degrees. The critical temperature for 4140 is 1575 so by quenching at below this will not harden the piece except for the high carbon surface.Subsequently, question is, what is the hardness of 4140 steel? Mechanical Properties Mechanical Properties Metric Imperial Hardness, Rockwell C (Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13.0 13.0 Hardness, Vickers (Converted from Brinell hardness) 207 207 Tensile Strength, Ultimate 655 MPa 95000 psi Tensile Strength, Yield 415 MPa 60200 psi One may also ask, how do you harden a flame? Heat is applied to the part being hardened, using an oxy- acetylene (or similar gas) flame on the surface of the steel being hardened and heating the surface above the upper critical temperature before quenching the steel in a spray of water. The result is a hard surface layer ranging from 0.050″ to 0.250″ deep.How can I heat treat 4140 at home? Re: How to heat treat 4140 Heat to 1500-1600° F and hold 1-1/2 hour per inch of greatest thickness. Quench into 150° F oil. Temper immediately after quenching, before the part has cooled to below 150° F. Parts should be held 1 hour per inch of thickness, 2 hours minimum.