LANGALLOY® 400

 

ALLOY TYPE LANGALLOY®
ALLOY NAME LANGALLOY® 400

Stock Sizes
 
Basic Properties - Mechanical Properties
Bar – Hot Worked and Annealed  
0.2% Proof Stress (N/mm2)[ksi] minimum 170 [24.7]
Ultimate Tensile Strength (N/mm2)[ksi] minimum 480 [69.6]
Elongation (%) minimum 35
Hardness (HBN) [Rings and Discs only] 110-132



Alloy Features Back to Top
   
Excellent corrosion resistance
   
Resistant to chloride stress corrosion
   
Fully weldable
   
ASME Approval for Pressure Vessel application


Chemical Specification Back to Top
Elements C Cu Fe Mn Ni P Pb S Si
Minimum   28.0     63.0        
Maximum 0.30 34.0 2.5 2.0   0.030 0.005 0.024 0.5



Physical Properties Back to Top
Density (Kg.m-1) 88.3
Magnetic Permeability (20°C) Could show magnetism as Curie temperature is close to room temperature
Curie Temperature (°C) -7 TO +10
Young’s Modulus (N/mm2) 179 x 103
Specific Heat, 20°C (J.Kg-1.°K-1) 419
Specific Electrical Resistance, 20°C (?Ω.m) 0.51
Thermal conductivity,20°C (W.m-1.°K-1) 21.8
Mean coefficient of thermal expansion, 20-100°C (°K-1) 14.1 x 10-6



Specifications Back to Top
   
BS 3076 NA13
   
ASTM B164 N04400
ASTM B164 N04405
QQ-N-281

 

Applications Back to Top
 
Chemical Process Industry:
Sulphuric Acid Production, Hydrochloric Acid Processes, Hydrofluoric & Fluorosilicic Acid Processes, Fatty Acid Production
 
Marine Industry and Shipbuilding:
Propellers and Shafts, Fasteners
 
Oil and Gas Industry:

Pumps, Valves, Crude Petroleum stills and process vessels

Heat Exchanger Plates

 

 

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 15.2 - 16,8
(49 - 54)		 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

15 - 18
(48 - 58)

 0.075 (0.003)  
Drilling – 12.7mm (1/2”) dia 15 - 18
(48 - 58)		 0.125 (0.005)  
Drilling – 25.4mm (1”) dia 15 - 18
(48 - 58)		 0.28 (0.011)  
Turning - Roughing 30-45
(100-150)		 0.40 – 0.50
(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 Back to Top
   
Good strength/ductility properties
   
Excellent corrosion resistance in a wide variety of corrosive chemicals including seawater and industrial acids
   
Corrosion resistance in hydrofluoric acid second only to silver
   
High resistance to erosion corrosion
   
Excellent resistance to stress corrosion cracking


Alloy Comparisons N04400 S31803 718
(ST)		 N05500 FERRALIUM 255-SD50
0.2% Proof Strength (N/mm2), minimum 170 450 550
max		 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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Disclaimer
Data in this publication is provided solely for the purposes of distribution of information. Langley Alloys cannot make guarantees with respect to subject matter or accuracy of this information. Langley Alloys specifically disclaims all guarantees, expressed, implied or otherwise, including without limitation, all warranties of merchantability and fitness for a particular purpose. This publication may include technical inaccuracies or typographical errors. If errors are found, please make a notification via e-mail to: info@langleyalloys.com