4140 Decarb Free Annealed
4140 DCF annealed is a chromiummolybdenun alloy steel that can be oil hardened to relatively high hardenability. The chromium content provides good hardness penetration, and the molybdenum imparts uniformity of hardness and high strength. Through variations in the method of heat treating 4140, an exceptionally wide range of properties can be attained. For this reason, it is often used as stock for forging, as 4140 has self scaling properties. 4140 responds readily to heat treatment and is comparatively easy to machine in the heat treated condition. 4140 resists creep in temperatures up to 1000° F and maintains its properties even after long exposure at these relatively high working temperatures. Other desirable properties include good wear resistance, excellent toughness and good ductility in the quenched and tempered condition.
ANALYSIS
The above values are average and may be considered as representative of 4140 DCF Annealed
APPLICATIONS
4140 can be used for as wide variety of applications where greater toughness and wear resistance is needed over lower carbon grades. Typical applications include strippers, holder blocks, mold bases, back up and support tooling, fixtures, jigs, molds, drill collars, stubs, couplings, reamer bodies, gear racks, valves, chain links, tool bodies, tool holders, guides, tracks, ways, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc. 4140 responds well to plating
MACHINEABILITY AND WELDABILITY
4140 has a machinability rating at 66% of B1112. Average cutting speed 110 ft/min.
4140 is difficult to weld, but can be welded by any of the common welding practices providing section is preheated, and stress relieved after welding.
HEAT TREATING
4140 has a hardening range of 1525° 1625° F. Quench in oil. A wide range of mechanical properties can be obtained by tempering between 400° and 1300° F.
Forging
Heat to 2100° to 2200° F
Normalizing
Heat to 1600°  1700° F. Cool in air. Average BHN 285
Annealing
Heat to 1450°  1550° F. Cool slowly in furnace. Average BHN 187
TOLERANCES
4140 decarb free annealed is produced in an oversize condition (minimum .015") with a milled or vertical spindle ground top and bottom with milled or sawn widths that are guaranteed to finish to nominal size.
SPEEDY METALS ITEMS
5/8" {A} x 11/4" {B}

{A} x {B}


13/4" x 41/2"

{A} x {B}

3" x 51/2"

3/8" {A} x 6" {B} 4140 DeCarb Free, Anneale

1/2" {A} x 3" {B} 4140 DeCarb Free, Anneale

5/8" {A} x 5" {B} 4140 DeCarb Free, Anneale

5/8" {A} x 6" {B} 4140 DeCarb Free, Anneale

3/4" {A} x 1" {B} 4140 DeCarb Free, Anneale

3/4" {A} x 51/2" {B} 4140 DeCarb Free, Anneale

3/4" {A} x 6" {B} 4140 DeCarb Free, Anneale

3/4" {A} x 8" {B} 4140 DeCarb Free, Anneale

3/4" {A} x 10" {B} 4140 DeCarb Free, Anneale

7/8" {A} x 11/4" {B} 4140 DeCarb Free, Anneale

1" {A} x 11/4" {B} 4140 DeCarb Free, Anneale

1" {A} x 11/2" {B} 4140 DeCarb Free, Anneale

1" {A} x 2" {B} 4140 DeCarb Free, Anneale

1" {A} x 3" {B} 4140 DeCarb Free, Anneale

1" {A} x 4" {B} 4140 DeCarb Free, Anneale

1" {A} x 8" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 11/2" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 13/4" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 2" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 21/2" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 23/4" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 3" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 31/2" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 4" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 41/2" {B} 4140 DeCarb Free, Anneale

11/4" {A} x 5" {B} 4140 DeCarb Free, Anneale

11/2" {A} x 2" {B} 4140 DeCarb Free, Anneale

11/2" {A} x 21/2" {B} 4140 DeCarb Free, Anneale

11/2" {A} x 3" {B} 4140 DeCarb Free, Anneale

13/4" {A} x 2" {B} 4140 DeCarb Free, Anneale

13/4" {A} x 3" {B} 4140 DeCarb Free, Anneale

2" {A} x 21/4" {B} 4140 DeCarb Free, Anneale

2" {A} x 21/2" {B} 4140 DeCarb Free, Anneale

2" {A} x 3" {B} 4140 DeCarb Free, Anneale

2" {A} x 4" {B} 4140 DeCarb Free, Anneale

2" {A} x 41/2" {B} 4140 DeCarb Free, Anneale

2" {A} x 6" {B} 4140 DeCarb Free, Anneale

2" {A} x 8" {B} 4140 DeCarb Free, Anneale

21/4" {A} x 21/2" {B} 4140 DeCarb Free, Anneale

21/4" {A} x 3" {B} 4140 DeCarb Free, Anneale

21/4" {A} x 31/2" {B} 4140 DeCarb Free, Anneale

21/4" {A} x 41/2" {B} 4140 DeCarb Free, Anneale

21/2" {A} x 3" {B} 4140 DeCarb Free, Anneale

21/2" {A} x 31/2" {B} 4140 DeCarb Free, Anneale

21/2" {A} x 5" {B} 4140 DeCarb Free, Anneale

21/2" {A} x 6" {B} 4140 DeCarb Free, Anneale

3" {A} x 31/4" {B} 4140 DeCarb Free, Anneale

3" {A} x 31/2" {B} 4140 DeCarb Free, Anneale

3" {A} x 10" {B} 4140 DeCarb Free, Anneale

31/2" {A} x 5" {B} 4140 DeCarb Free, Anneale

31/2" {A} x 7" {B} 4140 DeCarb Free, Anneale

41/2" {A} x 51/2" {B} 4140 DeCarb Free, Anneale

43/4" {A} x 7" {B} 4140 DeCarb Free, Anneale

1/2" {A} Sq 4140 DeCarbFree, Anneale

1" {A} Sq 4140 DeCarbFree, Anneale

11/4" {A} Sq 4140 DeCarbFree, Anneale

11/2" {A} Sq 4140 DeCarbFree, Anneale

13/4" {A} Sq 4140 DeCarbFree, Anneale

2" {A} Sq 4140 DeCarbFree, Anneale

21/4" {A} Sq 4140 DeCarbFree, Anneale

21/2" {A} Sq 4140 DeCarbFree, Anneale

3" {A} Sq 4140 DeCarbFree, Anneale
