HIDURON^® 191

ALLOY TYPE	HIDURON^®
ALLOY NAME	HIDURON^® 191

Basic Properties - Mechanical Properties

Ruling Sections up to 125mm
0.2% Proof Stress (N/mm² )[ksi] minimum	430 [123.5]
Ultimate Tensile Strength (N/mm²) [ksi] minimum	725 [105]
Elongation (%) minimum	18
Hardness (HBN)	163
Izod Impact Energy (J) [ft.lb]	40 [29.5]

Ruling Sections above 125mm
0.2% Proof Stress (N/mm² )[ksi] minimum	430 [64.5]
Ultimate Tensile Strength (N/mm²) [ksi] minimum	710 [103]
Elongation (%) minimum	18
Hardness (HBN)	170 250
Izod Impact Energy (J) [ft.lb]	40 [29.5]

Additional Testing

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Ultrasonic Testing

100% examination (including end-to-end) to ASTM A388 by compression wave and shear wave (longitudinal and circumferential). FBH dimensions 1.5mm (sections <50mm), 2.5mm (sections 50mm to 100mm) and 3.0mm (sections above 100mm.

Alloy Features

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	Excellent corrosion resistance in marine environments - superior to nickel aluminium bronzes and 22% chrome duplex stainless steels

	Superior strength, jet impingement resistance and general corrosion resistance compared to conventional copper nickels

	Greater strength and toughness than nickel aluminium bronzes - strength is comparable to 22% chrome duplex stainless steels

	No loss of impact strength down to -196°C

	Excellent anti-galling properties, particularly when operating against stainless steels

	Good anti-fouling properties

	Freedom from hydrogen embrittlement

	Low magnetic permeability

	Approved as a named alloy by the world’s most prestigious Navies

	Galvanic compatability with other copper alloys and stainless steels

Chemical Specification

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Ele.	Al	C	Cr	Cu	Fe	Mg	Mn	Ni	P	Pb	S	Si	SN	Zn	Tot. Imp.
Min	1			REM.	0.7		3.5	13.5
Max	2	0.05	0.5		1.2	0.05	5.5	16.5	0.01	0.02	0.15	0.15	0.1	0.2	0.3

Physical Properties

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Density (Kg.m^-1)	8500
Magnetic Permeability	<1.01
Young’s Modulus (N/mm²)	145 x 10³
Modulus of Rigidity (N/mm²)	52 x 10³
Specific Heat, 20°C (J.Kg^-1.°K^-1)	435
Electrical conductivity, 20°C (m.Ω^-1.mm^-2)	2.85
Thermal conductivity, 20°C (W.m^-1.°K^-1)	16.3
Mean coefficient of thermal expansion, 20-300°C (°K^-1)	16.0 x 10^-6

Specifications

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	MLA-MPS-19A--BAR

	DEF STAN 02: 835

	DGS 357

	DOD-C-24676

	EB 4223A

Applications

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Defence Applications:

Bolting for ships and submarines, Control elements of submarines, Pump shafts, Mechanical seals, Winch components, Gears, Hose couplings, Weapons handling equipment, Components in sonar devices, Propeller shafts, Drive bushes

Oil and Gas Industry:

Subsea bolting, Shafts for pumps & valves, Valve spindles, Hydraulic pistons & cylinders

Chemical Industry:

Impellers, pump shafts, valve components, process control equipment

Subsea Mining:

Hydraulic connectors, pistons and cylinders, pressure couplings

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	45-60 [150-200]	0.05-0.13 mm/tooth 0.02-0.005 in/tooth	0.5-6.0 (0.02-0.25)
Drilling	25-75 [80-250]	0.075-0.5 [0.003-0.02]
Turning - Roughing	120-180 [400-600]	0.4-0.75 [0.01-0.03]	3 (0.125)
Turning - Finishing	150-300 [500-1000]	0.15-0.4 [0.006-0.015]	0.5 (0.02)
Tips	Carbide tipped using water-soluble lubricant

Alloy Comparisons	Nickel-Aluminium Bronze	Aluminium-SiliconBronze	70/30 Copper-Nickel	HIDURON 191
Strength (0.2% Proof Stress, N/mm²), minimum	247	220	115	430
Impact Energy (J), minimum	23	33	54	40
Corrosion Resistance in seawater (mm/yr)	0.075	0.06	0.025	0.02
Anti-Galling Properties	Inferior	Inferior	Poor	Good

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HIDURON® 191

HIDURON^® 191