Metal Alloys
Alloy Home
Stainless Steels
General Information
Stainless Stl. Grades
Precipitation Hardening
Stainless Steel List
AISI Type 2xx
AISI Type 3xx
AISI Type 4xx
AISI Type 5xx
AISI Type 6xx
* For other AISI or Non-AISI, please use the search function above or check Grades.
Specific Stainless Stl
General Information
Essentials of Manufacturing

Information, coverage of important developments and expert commentary in manufacturing.

World Pumps

Major news, innovation and real-life applications for pumps and ancillary equipment.


How OEM's can make their parts better, faster, and more efficient.

Power Transmission

Gear drives, bearings, motors, clutches, couplings, machine controls, sensors and components.

more free magazines
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