Chemical Composition
Base Element
Al (Aluminum)
0.04
%  (maximum)  
C (Carbon)
0.08 to 0.12
%    
Cr (Chromium)
8.00 to 9.50
%    
Mn (Manganese)
0.30 to 0.60
%    
Mo (Molybdenum)
0.85 to 1.05
%    
N (Nitrogen)
0.030 to 0.070
%    
Nb (Niobium)
0.06 to 0.1
%    
Ni (Nickel)
0.40
%  (maximum)  
P (Phosphorus)
0.020
%  (maximum)  
S (Sulfur)
0.010
%  (maximum)  
Si (Silicon)
0.20 to 0.50
%    
V (Vanadium)
0.18 to 0.25
%    
 
Mechanical Properties
Tabular Data
 
Other Information
Material Class
Country
USA
Standards Body
Description
Ferritic Cr-Mo-V Steel (Grade 91, T91)
Designation
UNS K90901
Specification Type
Specification
UNS K90901
Specification Year
2008
Specification Status
Similar UNS Number
K90901
Equivalent Standards
ASME SA-182 (F91); SA-199 (T91); SA-213 (T91); SA-234 (WP91); SA-335 (P91); SA-336 (F91); SA-369 (FP91); SA-387 (91) ASTM A1012 (T91); A182 (F91); A213 (T91); A234 (WP91); A335 (P91); A336 (F91); A369 (FP91); A387 (91); A831 (T91)
Organization
Unified Numbering System (joint publication of ASTM and SAE)
Similar Alloys
 
Links
 



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