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4340 Alloy Steel
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.
Analysis:
| C | CO | CR | MN | MO | NI | P | S | SI | V | W |
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| 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 |
Size Availability:
Available upon request and subject to mill availability. A Diehl Steel representative will assist all customer requests for this product.Designations:
AISI 4340 Alloy Steel - USDIN 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
AMS 5331 - US
AMS 6359 - US
AMS 6359B - US
AMS 6414 - US
AMS 6414A - US
AMS 6415 - US
AMS 6415G - US
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