1.6511 | 4340 | SNCM439
This steel boasts high strength and toughness, excellent hardenability and good stability against overheating.
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(wt%)
| W-Nr | EN | AISI | JIS |
| 1.6511 | 36CrNiMo4 | 4340 | SnCM439 |
Chemical Composition
| C | Si | Mn | P | S | Cr | Mo | Ni |
| 0.38~0.43 | 0.15~0.35 | 0.60~0.80 | ≤0.035 | ≤0.040 | 0.70~0.90 | 0.20~0.30 | 1.65~2.00 |
Physical Properties
Density（g/cm3)：7.85
Modulus of Elasticity（Gpa): 210
Thermal Conductivity（W/（m.k)): 36~45
Heat Treatment Process
Hardening: Heat the steel evenly to 900~930°C until the whole section reaches temperature. Then quench in oil to cool.
Annealing: Heat the steel to 650-700°C, hold it well at temperature, and then let it cool slowly inside the furnace.
Tempering: Tempering temperature 850-880°C
Application Fields
It is applied to permanently stressed machine, engine and vehicle parts where high strength and toughness are required. Typical structural applications include aircraft landing gear, power transmission units, shafts and other structural components.
Disclaimer: the information and data presented herein are typical values for reference and are not intended as warranties to readers.
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