4140 Steel Heat Treatment Process

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.

4140 steel heat treatment process.

Sae aisi 4140 alloy steel. But it should be tempered for any heavy use. This leaves near full hardness. Normalizing removes any stresses within the steel that could create cracks when hardened.

Aisi sae 4140 alloy steel can be made into round steel bar flat square steel bar steel. 2 fully hardened 4140 ranges from 54 to 59 hrc. 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. Alloy description timkensteel s 4140hw grade is a fine grained low alloy steel that offers optimum heat treat response in heavier cross sections.

Fundamentals of the heat treating of steel 11 steel however is by far the most widely used alloy and for averygood reason. It is also part of a complete heat treatment not a replacement or simple secondary treatment. Not all steels are improved by cryogenic treatment. You find 4140hw in a.

For 4140 steel the recommended heat treatment 1 consists of heating to austenitizing temperature typically 1570 f 855 c followed by oil quenching. 3 tempering recommendations from the asm heat treaters guide for 4140 4142 is a minimum of 400 f. Tempering reheating after quenching will achieve the desired hardness range. 1 4140 is an ok die steel but is not recommended for radical shaped dies such as narrow fullering crown and so on.

Dry ice is solid at 108 76 f 78 2 c. Commercially available aisi 4140 steel has been studied to determine the effect of heat treatment processes on fracture toughness k. A dry ice acetone bath typicaly provides 78 f 61 c which is far short of the cryogenic temperature needed for treating steel.