41L40 CD Annealed

41L40.jpg

PACIFIC 41L40 is the free machining version of MOLY-KROME®. The addition of a small amount of lead to the chemistry plus cold drawing increases the average machinability rating to 86%. This leaded grade can be heat treated the same as a standard 4140 to achieve similar hardness and strength. Impact toughness is somewhat lower for the leaded grade for hardnesses exceeding 35 HRC. 41L40 works well in screw machines. It is sometimes used in the as received condition but is normally heat treated prior to use.

Chemical Composition

Heat Analysis - ranges and limits %

C

.38/.43

Mn

.75/1.00

P

.035 max

S

.040 max

Cr

.80/1.10

Mo

.15/.25

Pb

.15/.35

Typical Properties

Approximate - not specification

Tensile (psi)

105,000

Yield (psi)

85,000

Elongation

15%

Hardness

187 HB

Machinability

86%

Shapes and Conditions Available
  • Annealed Cold Drawn Rounds through 2-3/4" Diameter