41xx Steel - Properties

Properties

Alloy composition (by weight)
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 hundredths of a percent
Mechanical properties
Material Condition Tensile strength Yield strength Elongation in 2" Hardness (Rockwell)
4130 Cold drawn—normalized 85,000–110,000 psi (590–760 MPa) 70,000–85,000 psi (480–590 MPa) 20–30 B 90–96
4142 Hot rolled—annealed 90,000–100,000 psi (620–690 MPa) 60,000–70,000 psi (410–480 MPa) 20–30 B 90–95
Cold drawn—annealed 105,000–120,000 psi (720–830 MPa) 85,000–95,000 psi (590–660 MPa) 15–25 B 96–100
4150 Hot rolled—annealed 90,000–110,000 psi (620–760 MPa) 65,000–75,000 psi (450–520 MPa) 20–30 B 90–96

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