ALLOY 254

 

ALLOY TYPE Alloy
ALLOY NAME Alloy 254

Stock Sizes
   
 
Basic Properties - Mechanical Properties
0.2% Proof Stress (N/mm2 )[ksi] minimum 300 [43.5]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 650[94.2]
Elongation (%) minimum 35
Hardness (HBN) 270 max
Reduction of Area(%) minimum 50




Alloy Features Back to Top
   
High strength compared to 316L and 317L austenitic stainless steels
   
Excellent ductility and impact strength at both ambient and sub-zero temperatures
   
Non-magnetic
   
Higher resistance to abrasion, erosion and cavitation erosion than 316 and 317 stainless
   
Listed in MR-01-75 for sour service oilfield applications
   



Chemical Specification Back to Top
Elements C Cr Fe Mo Mn N Ni Nb P S Si V
Minimum   20.5 REMAINDER 1.5 4.0 0.2 11.5 0.1       0.1
Maximum 0.06 23.5 6.00 3.0 6.0 0.4 13.5 0.3 0.45 0.3 1.0 0.3



Physical Properties Back to Top
Density (Kg.m-3) 8000
Magnetic Permeability <1.05
Young’s Modulus (N/mm2) 200 x 103
Specific Heat 20°C (J.Kg-1.°K-1) 500
Electrical resistance, 20°C (µ.Ω.m) 0.85
Thermal conductivity, 20°C (W.m-1.°K-1) 13.5

Specifications Back to Top
   
Alloy 254 to MLA-MPS-254-BAR
   
ASTM A479 Bar UNS S31254
   
ASTM A276 Bar UNS S31254
   

ASTM A182 Forgings UNS S31254 F44
   

ASTM A240 Plate S31254
   

 

Applications Back to Top
 

Chemical Process Industry:
Urea Production,  Organic and Fatty Acids, High halide concentrations
 
Marine Industry and Shipbuilding:
Piping, Pumps, Valves, Heat exchangers,

Oil and Gas Industry:
Heat exchangers, Piping, Valves, Pumps
 
Pulp and Paper Industry:
Bleach plant, vats, drums, press rolls, piping

Power Industry
Flue gas scrubbers

Desalination plant
Piping, Condensers

 

Machining Advice Back to Top
Operation Cutting Speed m/min (ft/min) Feed Rate
mm/rev (in/rev)		 Depth of cut mm (in)
Milling 18 (58) 0.13-0.25 mm/tooth
0.005-0.010 in/tooth		 0.2-3.0 (0.007-0.12)
Drilling 6.4mm(1/4") dia 250rpm 0.075(0.003)  
Drilling 12.7mm(1/2") dia 250 rpm 0.125(0.005)  
Drilling 25.4mm(1") dia 150 rpm 0.28(0.011)  
Turning - Roughing 30 - 45 ( 100 - 150 ) 0.4-0.5 (0.015-0.020) 2.5 (0.1)
Turning - Finishing 50 - 60 ( 165 - 200 ) 0.13-0.20 (0.005-0.008) 0.5 (0.02)
Tooling

Milling/Turning: Carbide (SANDVIK GC 235, SECO T25M)

Drilling: HSS, point angle 118°, chisel angle 120°
KEY Features  of the Alloy

 

Resistant to crevice corrosion in seawater

Excellent corrosion resistance in seawater and concentrated halide environments

High resistance to stress corrosion cracking

Good resistance to erosion corrosion

Excellent ductility and impact  strength at both ambient and sub-zero  temperatures

Low magnetic permeability

 

Alloy Comparisons S20910 S32205 N05500 S31254 FERRALIUM 255-SD50
(0.2% Proof Strength, N/mm2) 420 510 690 325 610

Corrosion Rate (mm.y-1)Seawater

 <0.01 <0.01 <0.18 <0.01 <0.01

Corrosion Rate (mm.y-1)10% sulphuric acid at 80°C

 0.7 0.4 0.1 <0.15 <0.15

Corrosion Rate (mm.y-1) Boiling 50% nitric acid

0.18 <0.15 0.15 <0.15 <0.15
Wear Properties related to Hardness (HRC) RC27 RC25 RC20 RC27 RC27



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