4337 | 1.6582 | SNCM447
4337 is a nickel-chromium-molybdenum alloy steel offering high strength, excellent toughness, and good hardenability. It provides strong fatigue and impact resistance in the quenched and tempered condition
Available Form
Round Bar
Custom Diameter & Length
Flat Bar
Custom Thickness, Width & Length
Square Bar
Custom Width & Length
Steel Plate
Custom Thickness, Width & Length
Steel Grade Comparison
| W-Nr | EN | AISI | JIS |
| 1.6582 | 34CrNiMo6 | 4337 | SNCM447 |
Chemical Composition(wt%)
| C | Si | Mn | P | S | Cr | Mo | Ni |
| 0.35~0.40 | 0.20~0.35 | 0.60~0.80 | ≤0.04 | ≤0.04 | 0.70~0.90 | 0.20~0.30 | 1.65~2.00 |
Physical Properties
Density：7.84 g/cm³
Modulus of Elasticity: 210 GPa
Thermal Conductivity: 37.7 W/(m.K)
| Temperature | 20-100°C | 2-200°C | 2-300°C | 2-400°C |
| Coefficient of Thermal Expansion (×10-6 /K) | 11.1 | 12.1 | 12.9 | 13.5 |
Heat Treatment Process
ardening: Heat the steel evenly to 830~860°C until the whole section reaches temperature. Then quench in oil.
Annealing: Heat the steel to 850~880°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Heat the steel uniformly, hold it at the selected tempering temperature, and then allow it to cool in still air. Tempering temperature 540~660°C, hardness approx. 32~25HRC
Application Fields
High-pressure fasteners, crankshafts, camshafts, torsion bars, shafts, conveyor rollers, valve stems, tie rods, clutch discs, large hot stamping dies. Aerospace structural components including flaps, fuselage, landing gear and propeller shafts.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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