4140 Steel Heat Treatment Process

Three types of heat treatments were applied in this work.

4140 steel heat treatment process.

Dry ice is solid at 108 76 f 78 2 c. Tempering reheating after quenching will achieve the desired hardness range. Fundamentals of the heat treating of steel 11 steel however is by far the most widely used alloy and for averygood reason. A dry ice acetone bath typicaly provides 78 f 61 c which is far short of the cryogenic temperature needed for treating steel.

Commercially available aisi 4140 steel has been studied to determine the effect of heat treatment processes on fracture toughness k. 3 tempering recommendations from the asm heat treaters guide for 4140 4142 is a minimum of 400 f. But it should be tempered for any heavy use. It is also part of a complete heat treatment not a replacement or simple secondary 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. This leaves near full hardness. 4140hw alloy steel technical data 4140hw meets aisi4140 standards and has improved hardenability and strength in heavier cross sections.

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. 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. 1 4140 is an ok die steel but is not recommended for radical shaped dies such as narrow fullering crown and so on.

Alloy description timkensteel s 4140hw grade is a fine grained low alloy steel that offers optimum heat treat response in heavier cross sections. Not all steels are improved by cryogenic treatment. Normalizing removes any stresses within the steel that could create cracks when hardened.