4150 Heat Treated Resulfurized

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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 Max

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