Steel 1040

Aging Procedure

Not applicable.

Annealing Procedure

Anneal at 1600 to 1800 F and slow cool in the furnace for a full anneal. A stress relief anneal may be done at 1100 F and a normalizing treatment may be done at 1650 F with slow cooling.

Applications

Used for crankshafts, couplings and cold headed parts.

Cold Workability

In the annealed state the 1040 alloy is readily cold worked by conventional methods.

Forgeability

Forge at 2300 F down to 1800 F.

Formability

Forming of 1040 steel in the annealed condition is readily accomplished.

Hardening Procedure

Cold work will harden the alloy as will heat treatment and tempering.

Heat Treatability

This steel responds well to hardening by heat treatment at 1550 to 1650 F followed by water quench and then tempering to strength level desired.

Hot Workability

Hot work from 900 to 200 F.

Machinability

Machinability is good, rated at 60% that of the 1112 alloy used as a 100% machining rated steel.

Principle Design Features

1040 steel has a higher (0.40%) carbon content for greater strength than the lower carbon alloys. It is hardenable by heat treatment, quench and tempering to develop 150 to 250 ksi tensile strength.

Tempering Procedure

Tempering from the quenched condition may be done at 600 to 1300 F depending upon the strength desired.

Weldability

1040 steel is weldable by all of the welding methods. However with its higher carbon content it is important to use both pre-heat at 300 to 500 F and post-heat at 1100 to 1200 F practice per an approved welding procedure.