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AISI 1040

Typical analysis

AISI
C
Mn
P
S
1040
0.37 - 0.40
0.60 - 0.90
max. 0.04
max. 0.05
1045
0.43 - 0.50
0.60 - 0.90
max. 0.04
max. 0.05

A general purpose mild steel, medium-carbon fine grain machinery steel. In the production of this grade special controls are used for chemical composition, heating, rolling and surface preparation. These bars are suitable for applications of forging, cold drawing, machining, heat treating ( including flame hardening ). Good wear resistance can be obtained by flame or induction hardening.

Typical applications

Axles, bolts, shafts, machinery parts, lightly stressed gears, pinions forming dies.

Mechanical properties

As supplied.
The following are average values and may be considered as representative.

Tensile strength
PSI
87,000
Yield strength
PSI
52,500
Elongation
%
25
Reduction in area
%
49
Brinell hardness
180

Forging and Heatr Treatment Parameters

Thermal
Treatments

Starts
Temperature
(Celsius)

Finish
Temperature
(Celsius)
Cooling
Medium
Forging
1150°C max.
950° C
-
Annealing
800° C
830° C
Surface cool
Normalizing
870° C
920° C
Air
Hardening

840° C

870° C

Water quench
Hardening 855° C 885° C Oil quench
Tempering
430° C
700° C
According to required properties

Machinability

AISI 1040 in the as rolled bar has a machinability rating of 62% of AISI B-1112. Average surface cutting speed is 105 feet per minute.

Shear strength

The ultimate shear strength is approximately 66% of the ultimate tensile strength.

Weldability

Due to high carbon content, this material is not readily welded. With thin sections and flexible design, gas or arc welding may be used without preheating, but in joints over 1/2" to 3/4" thick, preheating is necessary. To develop equivalent strength in a weld, a low alloy filler is recommended. The grade of welding rod to be used depends on thickness of section, design, service requirements and so on.
 
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