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AISI 4137
Category Steel
Class Alloy steel
Type Standard
Common Names Chromium-molybdenum steel
Designations  France: AFNOR 40 CD 4 , AFNOR 42 CD 4
Germany: DIN 1.7225
Italy: UNI 38 CrMo 4 KB , UNI 40 CrMo 4 , UNI G 4O CrMo 4
Japan: JIS SCM 4 , JIS SCM 4 H
Sweden: SS 2244
United Kingdom: B.S. 708 A 42 , B.S. 708 M 40 , B.S. 709 M 40
United States: ASTM A322 , ASTM A331 , ASTM A505 , ASTM A519 , ASTM A547 , SAE J404 , SAE J412 , SAE J770 , UNS G41370

Composition

ElementWeight %
C  0.35-0.40 
Mn  0.70-0.90 
P  0.035 (max) 
S  0.04 (max) 
Si  0.15-0.30 
Cr  0.80-1.10 
Mo  0.15-0.25 

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  

Thermal Properties

Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 11.2  0-100 more rolled 
Glossary