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254 SMO (UNS S31254)

 

254 SMO Fasteners

Specifications

Standards Designation
ASTM A 479
ASME SB 479

254 SMO Fasteners Inventory Stock at factory rate:-

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Dimensions

Specifications

Alloy Common Name Related Specifications Tensile Strength Proof Stress Elongation
British European United States
Alloy 254 254SMO   1.4547 ASTM A479/A473,
/A240 S31254
F44		 655
[95]		 305
[44.2]		 35

Specifications of Alloy 254
  • 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

Chemical Specification of Alloy 254

Elements C Cr Fe Mo Mn N Ni Nb P S Si V
Minimum   19.5 REMAINDER 6.0   0.18 17.5          
Maximum 0.02 20.5   6.5 1.0 0.22 18.5   0.03 0.01 0.8  

Basic Properties of Alloy 254- 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

Physical Properties of Alloy 254

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.O.m) 0.85
Thermal conductivity, 20°C (W.m-1.°K-1) 13.5

 

Machining Advice of Alloy 254 - Hot worked and precipitation hardened

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°

Alloy Comparisons

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

 

Main Export Market

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