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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] |
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Superior tensile/impact strength properties |
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High corrosion resistance in marine environments,
particularly with regard to de-aluminification |
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Excellent resistance to cavitation erosion |
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High wear resistance |
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Impact properties retained to below -196°C |
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Resistant to high temperature scaling up to 1000°C |
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Low magnetic permeability |
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Mechanical stability at both elevated and sub-zero
temperatures |
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Good machinability |
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Fully weldable |
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Superior galling resistance to nickel-aluminium
bronze |
| Elements |
Al |
Cu |
Fe |
Mg |
Mn |
Ni |
Pb |
Si |
Sn |
Zn |
Total Impurities |
| Minimum |
6.0 |
REMAINDER |
0.5 |
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2.0 |
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| Maximum |
6.4 |
|
0.7 |
0.05 |
0.5 |
0.1 |
0.01 |
2.4 |
0.1 |
0.4 |
0.50 |
| 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 |
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DEF STAN 02-834 |
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NES 834 Part 2 |
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DGS 8453A |
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DGS 1044 |
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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
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| 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] |
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| 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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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 |
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