Alloy 625

 

ALLOY TYPE Alloy
ALLOY NAME Alloy 625

Stock Sizes
 
Basic Properties - Mechanical Properties

Annealed Condition  

Bar - Rulling Sections up to and including 101.6mm (4")

  
0.2% Proof Stress (N/mm2)[ksi] minimum 415 [60]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 830 [120]
Elongation (%) minimum 30
Bar - Rulling Sections greater than 101.6mm (4")  
0.2% Proof Stress (N/mm2)[ksi] minimum 345 [50]
Ultimate Tensile Strength (N/mm2)[ksi]
minimum		 760 [110]
Elongation (%) minimum 25
   



Alloy Features Back to Top
   
Excellent corrosion resistance
   
Resistant to chloride stress corrosion
   
Resistant to sulphide stress cracking
   
High fatigue strength in seawater
   
Excellent weldability
   
Low magnetic permeability


Chemical Specification Back to Top
Elements Al C Co Fe Mo Mn Nb Ni P S Si Ti
Minimum     20.0   8.0   3.15 58.0        
Maximum 0.40 0.10 23.0 5.0 10.0 0.50 4.15   0.015 0.015 0.50 0.4



Physical Properties Back to Top
Density (Kg.m-1) 84.4
Magnetic Permeability (20°C) <1.001
Curie Temperature (°C) -160
Young’s Modulus (N/mm2) 205 x 10
Specific Heat, 20°C (J.Kg-1.°K-1) 410
Specific Electrical Resistance, 20°C (?Ω.m) 1.29
Thermal conductivity,20°C (W.m-1.°K-1) 9.9
Mean coefficient of thermal expansion, 20-100°C (°K-1) 12.8 x 10



Specifications Back to Top
   

ASTM B564 N06625
ASTM B446 N06625

BS 3076 NA21

 

Applications Back to Top
 

Oil and Gas Industry:

Wellhead components, Sheathing, Fasteners, Clamps, Downhole equipment for corrosive/sour service.

 
Marine Industry and Shipbuilding:

Propellers and Shafts, Propulsion Motors, Wire Rope, Fasteners
 
Oil and Gas Industry:

Wellhead components, Sheathing, Fasteners, Clamps, Downhole equipment for corrosive/sour service.

Nuclear Power Plant:

Reactor core and control rod components

 

 

Machining Advice (hot worked and precipitation hardened alloy) Back to Top

Operation Cutting Speed m/min (ft/min) Feed Rate
mm/rev (in/rev)		 Depth of cut mm (in)
Milling 11 - 14
(35 - 45)

0.1-0.2 mm/tooth 0.004-0.008 in/tooth

 0.2-3.0
(0.007-0.12)
Drilling – 6.4mm (1/4”) dia 9-12
(29-38)		 0.05 (0.002)  
Drilling – 12.7mm (1/2”) dia 9-12
(29-38)		 0.13 (0.005)  
Drilling – 25.4mm (1”) dia 9-12
(29-38)		 0.25 (0.01)  
Turning - Roughing 30 - 45
(100 - 150)

0.40 – 0.50
0.015-0.020)

 2.5
(0.1)
Turning - Finishing 50 - 6-
(165-200)

0.13 – 0.20
(0.005-0.008)

 0.25
(0.01)
Tooling Milling/Turning: Carbide (SANDVIK GC 235, SECO T25M) , point angle 118°, chisel angle 120°Drilling: HSS

KEY Features  of the Alloy
Good strength/ductility properties from sub-zero temperatures to over 980°CExcellent corrosion resistance and fatigue resistance in a wide variety of corrosive environments including seawater and industrial acidsNon-magnetic and spark resistant

Resistant to high temperature oxidation and carburisation

Excellent resistance to stress corrosion cracking



Alloy Comparisons N06625 NO4400 N05500 S31803 FERRALIUM 255-SD50
0.2% Proof Strength (N/mm2), minimum 415 170 690 450 600
Corrosion Rate (mm.y-1) Seawater 0.01 0.25 0.18 <0.01 <0.01
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C		 0.15 0.06 0.1 0.4 <0.15
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid 		1.8 1.1 <2 >5 >5



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