4140 Annealed Cold Roll Steel

Analysis Mechanical_Properties Applications Machineability_and_Weldability Heat_Treating Tolerances Speedy Metals items

4140 cold finished annealed is a chromium-molybdenun 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. 4140 cold finished annealed is available in rounds, squares, rectangles and hexagons. 4140 cold rolled rounds is also available with an addition of .15-.35 lead (41L40), which improves machinability (77% of 1212, surface cutting speed 127 ft/min) without sacrificing other desirable properties, with the exception that the use of 41L40 is not recommended for applications above 400°F, since at elevated temperatures, ductility in 41L40 is low.

ANALYSIS

4140 cold roll bars conforms to ASTM A322; ASTM A331; ASTM A304

MECHANICAL PROPERTIES

The above values are average and may be considered as representative of 4140 cold rolled 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, ejectors, back up and support tooling, fixtures, jigs, molds, cams, drill collars, bolts, stubs, couplings, reamer bodies, axles, shafting, piston rods, rams, hydraulic machinery shafts, gears, sprockets, gear racks, valves, chain links, spindles, tool bodies, tool holders, tie rods, boring bars, guides, tracks, ways, slides, wear strips or parts, forming dies, brake dies, trim dies, bolsters, machinery parts and components, etc. This material roll threads, knurls, and may be plated

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. 41L40 not recommended due to the fumes produced with the addition of lead.

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

Rounds

Up to 1-1/2" incl. -0.003
Over 1-1/2 to under 2-1/2 -0.004
Over 2-1/2 to 4" incl. -0.005

Squares

Square Hex
Up to 3/4 incl. -0.004 -0.003
Over 3/4 to 1-1/2 incl. -0.005 -0.004
Over 1-1/2 to 2-1/2 incl -0.006 -0.005
Over 2-1/2 to 4" incl -0.008 -0.006

Flats (Width in Inches)*

Up to 3/4 incl -0.004
Over 3/4 to 1-1/2 incl -0.005
Over 1-1/2 to 3" incl -0.006
Over 3 to 4" incl -0.008
Over 4 to 6" incl -0.010

SPEEDY METALS ITEMS

1/2" x 5" 5/8" x 1-1/4"
1" 1-1/4" x 5"
2.500" x 4" 3-3/8" OD
1/4" {A} x 1" {B} 4140 Cold Finished, Anneale 1/4" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale 1/4" {A} x 2" {B} 4140 Cold Finished, Anneale
1/4" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale 1/4" {A} x 3" {B} 4140 Cold Finished, Anneale 1/4" {A} x 4" {B} 4140 Cold Finished, Anneale
3/8" {A} x 1" {B} 4140 Cold Finished, Anneale 3/8" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale 3/8" {A} x 2" {B} 4140 Cold Finished, Anneale
3/8" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale 3/8" {A} x 3" {B} 4140 Cold Finished, Anneale 3/8" {A} x 4" {B} 4140 Cold Finished, Anneale
3/8" {A} x 6" {B} 4140 Cold Finished, Anneale 1/2" {A} x 3/4" {B} 4140 Cold Finished, Anneale 1/2" {A} x 1" {B} 4140 Cold Finished, Anneale
1/2" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale 1/2" {A} x 2" {B} 4140 Cold Finished, Anneale 1/2" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale
1/2" {A} x 3" {B} 4140 Cold Finished, Anneale 1/2" {A} x 3-1/2" {B} 4140 Cold Finished, Anneale 1/2" {A} x 4" {B} 4140 Cold Finished, Anneale
1/2" {A} x 6" {B} 4140 Cold Finished, Anneale 5/8" {A} x 1" {B} 4140 Cold Finished, Anneale 3/4" {A} x 1" {B} 4140 Cold Finished, Anneale
3/4" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale 3/4" {A} x 2" {B} 4140 Cold Finished, Anneale 3/4" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale
3/4" {A} x 3" {B} 4140 Cold Finished, Anneale 3/4" {A} x 4" {B} 4140 Cold Finished, Anneale 3/4" {A} x 6" {B} 4140 Cold Finished, Anneale
1" {A} x 1-1/4" {B} 4140 Cold Finished, Anneale 1" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale 1" {A} x 2" {B} 4140 Cold Finished, Anneale
1" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale 1" {A} x 3" {B} 4140 Cold Finished, Anneale 1" {A} x 4" {B} 4140 Cold Finished, Anneale
1" {A} x 5" {B} 4140 Cold Finished, Anneale 1" {A} x 6" {B} 4140 Cold Finished, Anneale 1-1/4" {A} x 1-1/2" {B} 4140 Cold Finished, Anneale
1-1/4" {A} x 2" {B} 4140 Cold Finished, Anneale 1-1/4" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale 1-1/4" {A} x 3" {B} 4140 Cold Finished, Anneale
1-1/4" {A} x 3-1/2" {B} 4140 Cold Finished, Anneale 1-1/4" {A} x 4" {B} 4140 Cold Finished, Anneale 1-1/2" {A} x 2" {B} 4140 Cold Finished, Anneale
1-1/2" {A} x 2-1/2" {B} 4140 Cold Finished, Anneale 1-1/2" {A} x 3" {B} 4140 Cold Finished, Anneale 1-1/2" {A} x 3-1/2" {B} 4140 Cold Finished, Anneale
1-1/2" {A} x 4" {B} 4140 Cold Finished, Anneale 1-1/2" {A} x 5" {B} 4140 Cold Finished, Anneale 1-1/2" {A} x 6" {B} 4140 Cold Finished, Anneale
1-3/4" {A} x 6" {B} 4140 Cold Finished, Anneale 2" {A} x 3" {B} 4140 Cold Finished, Anneale 2" {A} x 4" {B} 4140 Cold Finished, Anneale
7/16" {A} Hex 4140 Cold Finished, Anneale 1/2" {A} Hex 4140 Cold Finished, Anneale 5/8" {A} Hex 4140 Cold Finished, Anneale
3/4" {A} Hex 4140 Cold Finished, Anneale 7/8" {A} Hex 4140 Cold Finished, Anneale 1" {A} Hex 4140 Cold Finished, Anneale
1-1/8" {A} Hex 4140 Cold Finished, Anneale 1-1/4" {A} Hex 4140 Cold Finished, Anneale 1-1/2" {A} Hex 4140 Cold Finished, Anneale
1-3/4" {A} Hex 4140 Cold Finished, Anneale 2" {A} Hex 4140 Cold Finished, Anneale 2-1/4" {A} Hex 4140 Cold Finished, Anneale
2-1/2" {A} Hex 4140 Cold Finished, Anneale 3" {A} Hex 4140 Cold Finished, Anneale 1/4" {A} Rd 4140 Cold Finished, Anneale
3/8" {A} Rd 4140 Cold Finished, Anneale 1/2" {A} Rd 4140 Cold Finished, Anneale 5/8" {A} Rd 4140 Cold Finished, Anneale
3/4" {A} Rd 4140 Cold Finished, Anneale 7/8" {A} Rd 4140 Cold Finished, Anneale 1" {A} Rd 4140 Cold Finished, Anneale
1-1/8" {A} Rd 4140 Cold Finished, Anneale 1-1/4" {A} Rd 4140 Cold Finished, Anneale 1-3/8" {A} Rd 4140 Cold Finished, Anneale
1-1/2" {A} Rd 4140 Cold Finished, Anneale 1-5/8" {A} Rd 4140 Cold Finished, Anneale 1-3/4" {A} Rd 4140 Cold Finished, Anneale
1-7/8" {A} Rd 4140 Cold Finished, Anneale 1-15/16" {A} Rd 4140 Cold Finished, Anneale 2" {A} Rd 4140 Cold Finished, Anneale
2-1/8" {A} Rd 4140 Cold Finished, Anneale 2-1/4" {A} Rd 4140 Cold Finished, Anneale 2-3/8" {A} Rd 4140 Cold Finished, Anneale
2-1/2" {A} Rd 4140 Cold Finished, Anneale 2-5/8" {A} Rd 4140 Cold Finished, Anneale 2-3/4" {A} Rd 4140 Cold Finished, Anneale
3" {A} Rd 4140 Cold Finished, Anneale 3-1/4" {A} Rd 4140 Cold Finished, Anneale 3-1/2" {A} Rd 4140 Cold Finished, Anneale
3-3/4" {A} Rd 4140 Cold Finished, Anneale 4" {A} Rd 4140 Cold Finished, Anneale 4-1/4" {A} Rd 4140 Cold Finished, Anneale
4-1/2" {A} Rd 4140 Cold Finished, Anneale 5" {A} Rd 4140 Cold Finished, Anneale 1/4" {A} Rd 41L40 Cold Finished, Anneale
5/16" {A} Rd 41L40 Cold Finished, Anneale 3/8" {A} Rd 41L40 Cold Finished, Anneale 1/2" {A} Rd 41L40 Cold Finished, Anneale
5/8" {A} Rd 41L40 Cold Finished, Anneale 3/4" {A} Rd 41L40 Cold Finished, Anneale 7/8" {A} Rd 41L40 Cold Finished, Anneale
1" {A} Rd 41L40 Cold Finished, Anneale 1-1/4" {A} Rd 41L40 Cold Finished, Anneale 1-3/8" {A} Rd 41L40 Cold Finished, Anneale
1-1/2" {A} Rd 41L40 Cold Finished, Anneale 1-5/8" {A} Rd 41L40 Cold Finished, Anneale 1-3/4" {A} Rd 41L40 Cold Finished, Anneale
2" {A} Rd 41L40 Cold Finished, Anneale 2-1/4" {A} Rd 41L40 Cold Finished, Anneale 2-1/2" {A} Rd 41L40 Cold Finished, Anneale
2-3/4" {A} Rd 41L40 Cold Finished, Anneale 3" {A} Rd 41L40 Cold Finished, Anneale 3-1/2" {A} Rd 41L40 Cold Finished, Anneale
4" {A} Rd 41L40 Cold Finished, Anneale 3/8" {A} Sq 4140 Cold Finished, Anneale 1/2" {A} Sq 4140 Cold Finished, Anneale
5/8" {A} Sq 4140 Cold Finished, Anneale 3/4" {A} Sq 4140 Cold Finished, Anneale 1" {A} Sq 4140 Cold Finished, Anneale
1-1/4" {A} Sq 4140 Cold Finished, Anneale 1-1/2" {A} Sq 4140 Cold Finished, Anneale 1-3/4" {A} Sq 4140 Cold Finished, Anneale
2" {A} Sq 4140 Cold Finished, Anneale 2-1/4" {A} Sq 4140 Cold Finished, Anneale 3" {A} Sq 4140 Cold Finished, Anneale