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4150 Heat Treated Resulfurized

HOT ROLLED & COLD FINISHED

PACIFIC 4150FM is a high strength chromium-molybdenum alloy which is readily machined in the heat treated condition. The controlled addition of sulfur gives 4150FM its unique free machining characteristics. Also, in sizes 3-1/4" through 11" diameters, it is calcium treated for additional ease of machining and extended tool life. These sizes are also rough turned oversize to clean up at nominal size. This saves the expense of machining the next larger size, as required with most hot rolled bars. 4150FM is not as weldable as 4142 because of the higher carbon content. However, it is weldable with proper procedures. It can also be induction hardened. Sizes through 6-1/2" diameter are stress relieved after machine straightening.

CHEMICAL COMPOSITION
Heat Analysis - ranges and limits %

C
.48/.53
Mn
.75/1.30
P
.035 MAX
S
.06/.10
Cr
.70/1.10
Mo
.15/.25

TYPICAL PROPERTIES
Approximate - not for specification

2"
.
Tensile (psi)
146,000
Yield (psi)
124,000
Elongation
18%
Hardness
302 HB
Machinability
60%
4"
.
Tensile (psi)
115,000/145,000
Yield (psi)
70,000/100,000
Elongation
16%
Hardness
302 HB
Machinability
60%
6"
.
Tensile (psi)
130,000
Yield (psi)
105,000
Elongation
16%
Hardness
293 HB
Machinability
60%
8"
.
Tensile (psi)
130,000
Yield (psi)
105,000
Elongation
16%
Hardness
293 HB
Machinability
60%

PROCESSING TEMPERATURES
Typical

Forge
2200°F MAX
Normalize
1525/1625°F
Case Harden
1500/1575°F
Anneal
1450/1550°F
Temper
750/1275°F & 350/450°F

Shapes and Conditions Available
Hot Rolled Heat Treated Rounds through 3" Diameter
Rough Turned Oversize Heat Treated Rounds from 3-1/4" through 11" Diameter
Press Forged Heat Treated Rounds in 12" and 13" Diameters