LANGALLOY® K-500

 

ALLOY TYPE LANGALLOY®
ALLOY NAME LANGALLOY® K - 500

Stock Sizes
 
Basic Properties - Mechanical Properties

Cold Worked and Precipitation Treated  

Section size up to and including 25mm:

  
0.2% Proof Stress (N/mm2)[ksi] minimum 760 [110.2]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 1000 [145]
Elongation (%) minimum 14
Section size 25mm – 55mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 690 [100]
Ultimate Tensile Strength (N/mm2)[ksi]
minimum		 970 [140.6]
Elongation (%) minimum 16
   
Cold Worked, Solution Treated and Precipitation Treated  
Section size up to and including 25mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 620 [89.9]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 900 [130.5]
Elongation (%) minimum 20
0.2% Proof Stress (N/mm2)[ksi] minimum 550 [79.8]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 830 [120]
Elongation (%) minimum 20
Hardness HB 250
Hot Worked and Precipitation Treated  
Section size up to and including 110mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 620 [89.9]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 900 [130.5]
Elongation (%) minimum 20
Hardness, HB 250
Section size 110mm – 300mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 585 [84.8]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 900 [130.5]
Elongation (%) minimum 20
Hardness, HB 250
   
Hot Worked, Solution Treated and Precipitation Treated  
Section size up to and including 25mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 500 [72.5]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 830 [120.3]
Elongation (%) minimum 15
Hardness, HB 250
Section size 25mm up to and including 110mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 585 [84.8]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 900 [130.5]
Elongation (%) minimum 20
Hardness, HB 250
Section size 110mm up to and including 300mm:  
0.2% Proof Stress (N/mm2)[ksi] minimum 500 [72.5]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 830 [120.3]
Elongation (%) minimum 15
Hardness, HB 250



Alloy Features Back to Top
   
High strength and hardness
   
Excellent corrosion resistance
   
Resistant to chloride stress corrosion
   
Good resistance to impingement attack
   
High fatigue strength in seawater
   
Low magnetic permeability


Chemical Specification Back to Top
Elements Al C Cu Fe Mn Ni S Si Ti
Minimum 2.30   27.0     63.0     0.35
Maximum 3.15 0.18 33.0 2.0 1.5   0.010 0.050 0.85



Physical Properties Back to Top
Density (Kg.m-1) 84.3
Magnetic Permeability (20°C) <1.005
Curie Temperature (°C) -90
Young’s Modulus (N/mm2) 179 x 103
Specific Heat, 20°C (J.Kg-1.°K-1) 418
Specific Electrical Resistance, 20°C (?Ω.m) 0.62
Thermal conductivity,20°C (W.m-1.°K-1) 17.5
Mean coefficient of thermal expansion, 20-100°C (°K-1) 13.4 x 10-6



Specifications Back to Top
   
BS 3076 NA18
   
ASTM B865 N05500
QQ-N-286

 

Applications Back to Top
 
Chemical Process Industry:
Processes involving organic acids, caustic soda and dry chlorine. Production of chlorinated plastics.
Applications include doctor blades and scrapers.
 
Marine Industry and Shipbuilding:
Propellers and Shafts, Fasteners, Gyroscopes
 
Oil and Gas Industry:
Pump shafts, Valve stems, Drill collars

 

 

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 10
(32)		 0.08-0.15 mm/tooth
0.003-0.006 in/tooth		 0.2-3.0
(0.007-0.12)
Drilling – 6.4mm (1/4”) dia 6-8
(19-25)		 0.08 (0.003)  
Drilling – 12.7mm (1/2”) dia 6-8
(19-25)		 0.13 (0.005)  
Drilling – 25.4mm (1”) dia 6-8
(19-25)		 0.20 (0.008)  
Turning - Roughing 18-24
(60-75)		 0.25 – 0.40
(0.010-0.020)		 2.5
(0.1)
Turning - Finishing 31-38
(100-120)		 0.10 – 0.20
(0.004-0.008)		 0.25
(0.01)
Tooling Milling/Turning: Carbide (SANDVIK GC 235, SECO T25M) , point angle 118°, chisel angle 120°Drilling: HSS




Alloy Comparisons N04400 S31803 718
(Aged)		 N05500 FERRALIUM 255-SD50
0.2% Proof Strength (N/mm2), minimum 170 450 827 690 600
Corrosion Rate (mm.y-1) Seawater 0.25 <0.01 <0.01 0.18 <0.01
Corrosion Rate (mm.y-1)
10% sulphuric acid at 80°C		 0.06 0.4 <0.15 0.1 <0.15
Corrosion Rate (mm.y-1)
Boiling 50% nitric acid 		1.1 >5 >1.5 <2 >5



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