4340 is a low alloy, nickel-chromium-molybdenum steel capable of being heat treated to high strength levels. The alloy has a good combination of ducility, toughness and strength along with high hardenability.
The Specialty Steel Products are available upon request and all stock is subject to mill availability. A Diehl Steel representative will assist all customer requests for these products.
4340 is a low alloy, nickel-chromium-molybdenum steel capable of being heat treated to high strength levels. The alloy has a good combination of ducility, toughness and strength along with high hardenability.
The Specialty Steel Products are available upon request and all stock is subject to mill availability. A Diehl Steel representative will assist all customer requests for these products.
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
|---|---|---|---|---|---|---|---|---|---|---|
| 0.38 – 0.43 | 0.70 – 0.90 | 0.65 – 0.85 | 0.20 – 0.30 | 1.65 – 2.00 | 0.04 Max. | 0.04 Max. | 0.15 – 0.30 |
Available upon request and subject to mill availability. A Diehl Steel representative will assist all customer requests for this product.
AISI 4340 Alloy Steel-US
DIN 1.6565-Germany
JIS SNCM 8-Japan
B.S. 2 S 119-United Kingdom
B.S. 3 S 95-United Kingdom
B.S. 3111 Type 6-United Kingdom
B.S. 817 M 40-United Kingdom
ASTM A322-US
ASTM A331-US
ASTM A505-US
ASTM A519-US
ASTM A547-US
ASTM A646-US
MIL SPEC MIL-S-16974-US
SAE J404-US
SAE J412-US
SAE J412-US
SAE J770-US
UNS G43400-US