From Wikipedia, the free encyclopedia 41xx steel
41xx steel
Alloy composition (by weight)[1]
SAE grade % Cr % Mo %C* % Mn % P (max) % S (max) % Si
4118 0.40–0.60 0.08–0.15 0.18–0.23 0.70–0.90 0.035 0.040 0.15–0.35
4120 0.40–0.60 0.13–0.20 0.18–0.23 0.90–1.20 0.035 0.040 0.15–0.35
4121 0.45–0.65 0.20–0.30 0.18–0.23 0.75–1.00 0.035 0.040 0.15–0.35
4130 0.80–1.10 0.15–0.25 0.28–0.33 0.40–0.60 0.035 0.040 0.15–0.35
4135 0.80–1.10 0.15–0.25 0.33–0.38 0.70–0.90 0.035 0.040 0.15–0.35
4137 0.80–1.10 0.15–0.25 0.35–0.40 0.70–0.90 0.035 0.040 0.15–0.35
4140 0.80–1.10 0.15–0.25 0.38–0.43 0.75–1.00 0.035 0.040 0.15–0.35
4142 0.80–1.10 0.15–0.25 0.40–0.45 0.75–1.00 0.035 0.040 0.15–0.35
4145 0.80–1.10 0.15–0.25 0.43–0.48 0.75–1.00 0.035 0.040 0.15–0.35
4147 0.80–1.10 0.15–0.25 0.45–0.50 0.75–1.00 0.035 0.040 0.15–0.35
4150 0.80–1.10 0.15–0.25 0.48–0.53 0.75–1.00 0.035 0.040 0.15–0.35
4161 0.70–0.90 0.25–0.35 0.56–0.64 0.75–1.00 0.035 0.040 0.15–0.35
* The carbon composition of the alloy is denoted by the last two digits of the SAE specification number, in hun-
dredths of a percent
Mechanical properties
Material Condition Tensile strength [psi Yield strength [psi Elongation in Hardness
(MPa)] (MPa)] 2" [%] Rockwell)
(Rockwell)
4130 Cold drawn—normal- 85,000–110,000 psi 70,000–85,000 psi 20–30 B 90–96
ized[2] (590–760 MPa) (480–590 MPa)
4142 Hot rolled—an- 90,000–100,000 psi 60,000–70,000 psi 20–30 B 90–95
nealed[2] (620–690 MPa) (410–480 MPa)
Cold 105,000–120,000 psi 85,000–95,000 psi 15–25 B 96–100
drawn—annealed[2] (720–830 MPa) (590–660 MPa)
4150 Hot 90,000–110,000 psi 65,000–75,000 psi 20–30 B 90–96
rolled—annealed[2] (620–760 MPa) (450–520 MPa)
41xx steel is a family of SAE steel grades, as specified by M16 rifle and M4 carbine barrels by the United States
the Society of Automotive Engineers (SAE). Alloying ele- military. These steels are also used in aircraft parts and
ments include chromium and molybdenum, and as a re- therefore 41xx grade structural tubing is sometimes re-
sult these materials are often referred to as chromoly ferred to as "aircraft tubing".
CRMO.
steel or CRMO They have an excellent strength to weight
ratio, are easily welded and are considerably stronger
and harder than standard 1020 steel.
Properties
While these grades of steel do contain chromium, it is
not in great enough quantities to provide the corrosion Other characteristics
resistance found in stainless steel.
One of the characteristics of this class of steel is the abil-
Examples of applications for 4130 and 4140 include
ity to be case hardened by carburization of the surface.
structural tubing, bicycle frames, firearms receivers,
The core of the material retains its bulk properties, while
clutch and flywheel components, and roll cages. 4150
the outside is significantly hardened to reduce wear and
stands out as being one of the steels accepted for use in
1
From Wikipedia, the free encyclopedia 41xx steel
tear on the part. This makes this grade of steel an ex-
cellent material for such uses as gears, piston pins, and
References
crankshafts.[1] [1] ^ Central Steel & Wire Company Catalog (2006-2008
ed.), p. 246 . Note: "For bar products; plate, sheet
and tubing may be slightly different."
[2] ^ Central Steel & Wire Company Catalog (2006-2008
ed.), p. 260 .
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