Cold Rolled Steel C1045

Grade Description: A medium carbon steel allowing higher strength properties than 1018. A wide range of properties can be obtained.

Typical Applications: Shafts, machinery parts, bolts, pinions, gears.

Analysis: C – .43/.50 Mn – .60/.90 P – .04 Max. S – .05 Max.

Mechanical Properties: (following are minimum properties based on typical 1” bar)

Typical Mechanical Properties**:

Tensile Strength (PSI) 82,000
Yield Point (PSI) 45,000
Elongation*** 16
Brinell Hardness 162

* Chemical Analysis will vary on each heat number

** Tests based on Cold Drawn Round Bar – All values are minimum values and are representative.

*** % in 2”

Machinability: 64% based on 1212 as 100%.

Surface Cutting Speed: 95-105 ft/min.

Weldability: Fair. With thin sections and flexible design, gas or arc welding may be used without preheating except in joints over 1/2“ to 3/4” thick where preheating is necessary. For equivalent strength in a weld a low alloy filler is recommended. Stress relieving after is recommended. Grade of welding rod to be used depends on thickness of section, design, service requirement, etc.

Hardening: Essentially water hardened (1550º F) although can be quenched in oil (1575º F). Wide range of mechanical properties obtained by tempering between 700º F to 1300º F. Avoid tempering between 500º F and 700º F.

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