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
0.38 - 0.43 0.70 - 0.900.65 - 0.850.20 - 0.301.65 - 2.000.04 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-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

Data is typical and should not be construed as actual values for any category.
Applications and technical information require engineers and tool designers to exercise independent judgement.