4140 Steel Heat Treatment Process

Three types of heat treatments were applied in this work.

4140 steel heat treatment process.

Fundamentals of the heat treating of steel 11 steel however is by far the most widely used alloy and for averygood reason. You find 4140hw in a. Tempering reheating after quenching will achieve the desired hardness range. Commercially available aisi 4140 steel has been studied to determine the effect of heat treatment processes on fracture toughness k.

Not all steels are improved by cryogenic treatment. A dry ice acetone bath typicaly provides 78 f 61 c which is far short of the cryogenic temperature needed for treating steel. 2 fully hardened 4140 ranges from 54 to 59 hrc. Normalizing removes any stresses within the steel that could create cracks when hardened.

Dry ice is solid at 108 76 f 78 2 c. Sae 4140 aisi 4140 steel is a cr mo series chrome molybdenum series low alloy steel this material has high strength and hardenability good toughness small deformation during quenching high creep strength and long lasting strength at high temperature. Aisi sae 4140 alloy steel can be made into round steel bar flat square steel bar steel. Sae aisi 4140 alloy steel.

For 4140 steel the recommended heat treatment 1 consists of heating to austenitizing temperature typically 1570 f 855 c followed by oil quenching. It is also part of a complete heat treatment not a replacement or simple secondary treatment. 4140hw alloy steel technical data 4140hw meets aisi4140 standards and has improved hardenability and strength in heavier cross sections. Among layman the reason for steel s dominance is usually con sidered to be the abundance of iron ore iron is the principal ingredient in all steels and or the ease by which it can be refined from ore.

But it should be tempered for any heavy use. Heat the steel to 1 675 degrees fahrenheit in a heat treat furnace or forge and hold it at that temperature for approximately 30 minutes per inch of length to normalize the steel. This leaves near full hardness.