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AISI Type 634
Category Steel
Class Stainless steel
Type Precipitation-hardening nonstandard
Common Names Chromium steel
Designations  United States: AMS 5547 , AMS 5549 , AMS 5594 , AMS 5742 , AMS 5743 , AMS 5744 , AMS 5780 , AMS 5781 , ASTM A564 , ASTM A579 , ASTM A693 , ASTM A705 , SAE J467 (AM-355) , UNS S35500

ElementWeight %
C  0.10-0.15 
Mn  0.5-1.25 
Si  0.50 
Cr  15.0-16.0 
Ni  4.0-5.0 
P  0.04 
S  0.03 
Mo  2.5-3.25 

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  
Tensile Strength (Mpa) 1520  25  subzero cooled and tempered at 455°C (sheet (0.69 mm)) more
Yield Strength (Mpa) 1286 
Elongation (%)
Reduction in Area (%)  

Thermal Properties
Properties Conditions 
T (°C)Treatment
Thermal Expansion (10-6/ºC) 17.1  25-100 more  
Thermal Conductivity (W/m-K) 15.1  38 more  

Electric Properties
Properties Conditions 
T (°C)Treatment
Electric Resistivity (10-9W-m) 75.7  25 more