HIDURAX® 7

 

ALLOY TYPE HIDURAX®
ALLOY NAME HIDURAX® 7

Stock Sizes
   
  HIDURAX 7 is an aluminium-silicon bronze possessing good mechanical strength and hardness, and advantageous ductility, corrosion resistance (particularly to de-aluminification) and wear resistance. Also of benefit are HIDURAX 7’s superior bearing properties, low magnetic permeability, good impact strength and ease of weldability.

Basic Properties - Mechanical Properties
0.2% Proof Stress (N/mm2 )[ksi] minimum 245-310 [35.5-50]
Ultimate Tensile Strength (N/mm2) [ksi] minimum 540-620 [78.3-90]
Elongation (%) minimum 20-35
Hardness (HBN) 130-180
Impact (J)[ft lb] 34-54 [25-40]




Alloy Features Back to Top
   
Superior tensile/impact strength properties
   
High corrosion resistance in marine environments, particularly with regard to de-aluminification
   
Excellent resistance to cavitation erosion
   
High wear resistance
   
Impact properties retained to below -196°C
   
Resistant to high temperature scaling up to 1000°C
   
Low magnetic permeability
   
Mechanical stability at both elevated and sub-zero temperatures
   
Good machinability
   
Fully weldable
   
Superior galling resistance to nickel-aluminium bronze



Chemical Specification Back to Top
Elements Al Cu Fe Mg Mn Ni Pb Si Sn Zn Total Impurities
Minimum 6.0 REMAINDER 0.5         2.0      
Maximum 6.4   0.7 0.05 0.5 0.1 0.01 2.4 0.1 0.4 0.50



Physical Properties Back to Top
Density (Kg.m-3) 7800
Magnetic Permeability 1.05
Young’s Modulus (N/mm2) 128 x 103
Electrical conductivity, 20°C 8-9% IACS
Electrical resistivity, 20°C (µ.Ω.m) 0.22
Specific Heat (J.Kg-1.°K-1) 419
Thermal conductivity, 20°C (W.m-1.°K-1) 425
Mean coefficient of thermal expansion, 20-300°C (°K-1) 18.0 x 10-6



Specifications Back to Top
   
DEF STAN 02-834
   
NES 834 Part 2
   
DGS 8453A
   
DGS 1044

 

Applications Back to Top
 

Pump Shafts
Valve Spindles
Bushes for heavy equipment bearings
Fasteners
Rotors and slippers for hydraulic motors
Worm Wheels
Marine Propeller shafts
Friction press and screwdown nuts

 

Machining Advice Back to Top
Operation Cutting Speed m/min (ft/min) Feed Rate
mm/rev (in/rev)
Depth of cut mm (in)
Milling 30-60 [100-200] 0.25 mm/tooth
0.010 in/tooth
3.0-6.0 (0.10-0.25)
Drilling 15-40 [50-130] 0.075-0.5 [0.003-0.02]  
Turning - Roughing 30-60 [100-200] 0.25 mm/rev
0.010 in/rev
3.0-6.0 (0.10-0.25)
Turning - Finishing 120-180 [400-600] 0.12 [0.005] 0.12-0.25 (0.005-0.010)
Tips Carbide tipped using water-soluble lubricant



Alloy Comparisons HIDURAX 7 HIDURAX 1 BS 970
070M55
Medium
Carbon Steel
316
Stainless
Steel
Strength (0.2% Proof Stress, N/mm2), minumum 235 400 355 205
UTS 525 700 700 515
Cavitation erosion rate (mm3/h) in fresh water 0.6 0.6 >4 1.7
Electrical Conductivity (%IACS) 8.5 8 8.5 3
Magnetic Permeability 1.05 1.50 Ferromagnetic 1.05



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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