Can you induce hardened 4140?
2.1. Since the aim of the induction hardening is to improve the surface hardness, the carbon content in steel to be induction hardened should be between 0.3 and 0.5%. Thus, the AISI 4140 (42CrMo4) steel used in the tests was normalised prior to the induction hardening.
How do you harden 4140?
For 4140 steel, the recommended heat treatment  consists of heating to austenitizing temperature, typically 1570°F (855°C), followed by oil quenching. Tempering (reheating after quenching) will achieve the desired hardness range.
Is 4140 steel good for gun barrels?
4140 Gun Barrel Steel is a chromium molybdenum alloy steel with good hardness penetration. This material was designed with consistent hardness and high strength.
How to quenching and tempering of 4140 alloy steel?
How to quenching and tempering of 4140 alloy steel? The quenched and tempered of 4140 alloy steel production process: electric furnace smelting (EBT), LF refining, ingot casting, hot delivery, soaking pit, rolling, slow cooling, the surface peeled, quenching, tempering, steel straightening, cleaning inspection and turned over.
What is the best temperature for oil quench?
A good place to start for oil quench is 1550 degrees F. If your steel did nothing with water quench, you have to consider that what you have is not 4140. 1018 will be soft if you do what you did. Actual 4140 will show some hardening affect if you just heat it to 1550 F. and air cool it.
What is the hardness of 4140 steel?
By contrast, 4140 is a medium-carbon (nominal 0.40%C) chromium-molybdenum alloy steel that is most often oil quenched to attain an as-quenched hardness ranging from about 54-59 HRC (as quenched), depending on the precise carbon content (which affects the hardenability of the material).
How to roll a 4140 steel ingot?
Use Rolling mill will steel ingot rolled into Φ180mm ~ Φ310mm. Since 4140 steel containing Mn and S, for the steel ingot of hot delivery use the soaking temperature 1260 ℃ in the production process, soaking time 3h, so you can make the steel ingot was burn-through, the steel rolling uniform deformation.