HIDURAX^® 7

ALLOY TYPE	HIDURAX^®
ALLOY NAME	HIDURAX^® 7

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

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	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

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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

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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

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	DEF STAN 02-834

	NES 834 Part 2

	DGS 8453A

	DGS 1044

Applications

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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

Machining Advice

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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]
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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HIDURAX® 7

HIDURAX^® 7