Materials: Metal Alloys: Properties
engineering fundamentals Alloys Properties
Directory | Career | News | Standards | Industrial | SpecSearch®
Metal Alloys
Alloy Home
Ferrous Alloys
Steels in General
Alloy Steels
Carbon Steels
Stainless Steels
Tool Steels
Non-Ferrous Alloys
Aluminum Alloys
Copper Alloys
Magnesium Alloys
Titanium Alloys
Specific Alloy
General Information
Resources
Bibliography
Login

Home Membership Magazines Forum Search Member Calculators

Materials

Design

Processes

Units

Formulas

Math
 
AISI 4340
Category Steel
Class Alloy steel
Type Standard
Common Names Nickel-chromium-molybdenum steel
Designations  Germany: DIN 1.6565
Japan: JIS SNCM 8
United Kingdom: B.S. 2 S 119 , B.S. 3 S 95 , B.S. 3111 Type 6 , B.S. 817 M 40
United States: AMS 5331 , AMS 6359 , AMS 6359B , AMS 6414 , AMS 6414A , AMS 6415 , AMS 6415G , ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , ASTM A547 , ASTM A646 , MIL SPEC MIL-S-16974 , SAE J404 , SAE J412 , SAE J770 , UNS G43400

Composition

ElementWeight %
C  0.38-0.43 
Mn  0.60-0.80 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.70-0.90 
Ni  1.65-2.00 
Mo  0.20-0.30 

Mechanical Properties

Properties Conditions 
T (°C)Treatment
Density (×1000 kg/m3) 7.7-8.03 25  
Poisson's Ratio 0.27-0.30 25  
Elastic Modulus (GPa) 190-210 25  
Tensile Strength (Mpa) 744.6  25  annealed at 810°C  more
Yield Strength (Mpa) 472.3 
Elongation (%) 22.0 
Reduction in Area (%) 49.9 
Hardness (HB) 217  25  annealed at 810°C more
Impact Strength (J)
(Izod)
51.1  25  annealed at 810°C  more

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 11.5  20-100 more oil hardened, tempered 630°C 

Electric Properties

Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 248  20 more  
Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2014 eFunda, Inc.