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4340

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 – 0.430.70 – 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.
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