SAE 4340 Steel Billets
AISI / SAE 4340 nickel-chromium-molybdenum steel. A tough, high strength steel with excellent hardenability. Often chosen for heavy-duty, shock-loaded parts.
SAE 4340 chemical composition
| C | 0.38 – 0.43 % |
|---|---|
| Si | 0.15 – 0.35 % |
| Mn | 0.60 – 0.80 % |
| Ni | 1.65 – 2.00 % |
| Cr | 0.70 – 0.90 % |
| Mo | 0.20 – 0.30 % |
Indicative ranges from the common grade standard. The final analysis is as per the order and the heat test certificate.
Equivalent grades
EN24 / 817M40 · 34CrNiMo6 / 1.6582 approx.
Equivalents are approximate. See the grade equivalents guide.
SAE 4340 billets and blooms
4340 billets and blooms supply forgings where fracture toughness and hardenability are critical.
Kesari Alloys supplies SAE 4340 as continuous cast billets and blooms from 100 × 100 to 250 × 250 mm and 200 mm round, in lengths up to 12 metres. See the billet size chart for weight per metre.
Heat treatment: Hardened and tempered. Deep hardening in large sections.
Typical uses of SAE 4340
- Heavy shafts and rotors
- Landing-gear-type and high stress parts (subject to specification)
- Gears
- Oil field components
Industries: forging, oil field equipment, power plant components, heavy engineering.
Related grades
SAE 4340 questions
What is SAE 4340 steel used for?
SAE 4340 is used for heavy shafts and rotors, landing-gear-type and high stress parts (subject to specification), gears, oil field components.
What is the equivalent of SAE 4340?
EN24 / 817M40 · 34CrNiMo6 / 1.6582 approx.. Equivalents are approximate, so check the limits in your specification.
Does Kesari Alloys supply SAE 4340 billets?
Yes. SAE 4340 is available as continuous cast billets and blooms (100 to 250 mm and 200 mm round, up to 12 m). Send the size, length, quantity and standard to info@ksl.in for a quotation.