Machinery Grade
9840 Steel
High performance
Low-alloy nickel-chrome-molybdenum steel for quenching and tempering, with high mechanical strength, good toughness and high hardenability in medium sections. Supplied quenched and tempered, ready to machine, and can be re-treated to adjust its properties to the application.
Main features
Good hardenability
Medium-high strength
Tough after quenching and tempering
Standards and equivalents
| SAE / AISI | EN | DIN | JIS |
|---|---|---|---|
| 9840 | 39NiCrMo3 | 1.6510 | — |
Chemical composition
| % | C | Si | Mn | Cr | Ni | Mo | P | S |
|---|---|---|---|---|---|---|---|---|
| Min | 0.38 | 0.20 | 0.70 | 0.70 | 0.85 | 0.20 | — | — |
| Max | 0.43 | 0.35 | 0.90 | 0.90 | 1.15 | 0.30 | 0.040 | 0.040 |
Supply condition
Hot forgedQuenched and tempered
Hot rolledQuenched and temperedAvailable package sizes
Plates1/2" – 10"13 mm – 254 mm
Round bars1/2" – 5"13 mm – 127 mm—
—
Typical applications
- Axles and shafts
- Transmission gears
- High-load pinions
- Crankshafts
- Connecting rods
- High-strength bolts
- Industrial couplings
- Heavy machinery components
- Mold bases and molds
Note: The information and values in this data sheet are provided for reference only and may vary depending on manufacturing, treatment and application conditions. They do not constitute guaranteed specifications, so use and interpretation of this data is the user's responsibility.
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