4140 Steel Heat Treatment Chart

Tempering temperature of 4140 alloy steel can be from 204 649 c 400 1200 f after normalizing and oil quenching and the corresponding rockwell hardness can be obtained.

4140 steel heat treatment chart.

It can be formed using conventional techniques in the annealed condition. For 4140 steel the recommended heat treatment 1 consists of heating to austenitizing temperature typically 1570 f 855 c followed by oil quenching. The chart below describes various types of tool steels their composition and appropriate heat treating applications. Inspection of a jominy chart for 4140 which can be found in the sae handbook shows that for a jominy distance of 5 the lower hardness limit is rc 51 and the upper limit is rc 59.

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. However the mechanical properties of this steel will be affected if it is welded in the heat treated condition and post weld heat treatment should be performed. Din 1 7225 steel has high ductility.

4340 steel heat treatment alloy steel 4340 heat treatment including. 4340 heat treat normalizing. 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.

From available data for an oil quenched inch diameter round part you will need to temper at approximately. But it should be tempered for any heavy use. Steel composition harden f temper f anneal f normalize f quench. 2 fully hardened 4140 ranges from 54 to 59 hrc.

Normalizing annealing hardening tempering spheroidization stress relief etc. Since the 90 martensite hardness of rc 51 lies within the upper and lower hardness limits the 3 4 bar will fully harden to the center. Aisi 4140 alloy steel can be welded using all conventional techniques. You find 4140hw in a.

At the annealed condition 1 7225 alloy tool steel has good machinability. 4140 steel round bar sheet plate heat treatment machinability. This leaves near full hardness. Heat treatment to 845 c slow cooling from 755 c at a rate of 14 c 25 f hour to 665 c or rapid cooling to 675 c for 5 hours isothermal annealing.

Aisi 4140 alloy steel is heated at 845 c 1550 f followed by quenching in oil.