HIDURON^® 191 (NES 835)

DEF STAN 02: 835

HIDURON 191 is a high strength precipitation hardened cupronickel alloy containing about 14.5% nickel and 4.5% manganese strengthened by additions of aluminium and iron, which may be refined by controlled small amounts of chromium.

HIDURON 191 was developed at provide both the corrosion resistance and anti-fouling characteristics of conventional cupronickels but with superior tensile and toughness properties compared to aluminium bronzes.

The alloy meets the requirements of NACE MR-01-75 and can be supplied to the MOD specification NES 835 if required.

Applications for HIDURON 191 include shafts, fasteners, valve stems, flanges and other critical high strength components and is widely used in surface and subsea naval vessels and on offshore oil and gas platforms.

Alloy	Common Name	Related Specifications			Tensile Strength	Proof Stress	Elongation
Alloy	Common Name	British	European	United States	Tensile Strength	Proof Stress	Elongation
HIDURON 191	835	DEF STAN 02-835, NES 835		C72420 DOD-C-24676 EB 4223A	725 [105.1] (≤125mm)710 [102.9] (>125mm)	430 [64.5 ] (≤125mm)400 [58 ] (>125mm)	18

HIDURON^® 191 Technical Information

HIDURON 191 Bar stock sizes available
Diameter (in)	Diameter (mm)	kg per m
5/8	15.88	1.68
3/4	19.05	2.42
7/8	22.23	3.30
1	25.40	4.31
1 1/4	31.75	6.73
1 1/2	38.10	9.69
1 3/4	44.45	13.19
2	50.80	17.23
2 1/2	63.50	26.92
3	76.20	38.76
3 1/2	88.90	52.76
4	101.60	68.91
5	127.00	107.68
6	152.40	155.05

Specifications of Hiduron 191

MLA-MPS-19A--BAR
DEF STAN 02: 835
DGS 357
DOD-C-24676
EB 4223A
DIN 2.1504
DIN 2.1504
DIN 2.1504

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HIDURON 191 Bar & Forgings Purchase Specification

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Chemical Specification of Hiduron 191

Basic Properties of Hiduron 191 - Mechanical Properties

Ruling Sections up to 65mm
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 65mm
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
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.

Physical Properties of Hiduron 191

Applications of Hiduron 191

Hiduron 191 Features

Forms of HIDURON 191 Available

Machining Advice of Hiduron 191

Alloy Comparisons

Disclaimer
Data in this Hiduron 191 page 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

Elements	Al	C	Cr	Cu	Fe	Mg	Mn	Ni	P	Pb	S	Si	SN	Zn	Tot. Imp.
Minimum	1			REM.	0.7		3.5	13.5
Maximum	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

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.O^-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

Alloys	Bars & Sections	Hot & Cold Rolled Plate	Ingot & Billet	Forged Products	Sand Castings
HIDURON 130
HIDUREL 5
HIDURON 191
HIDURON 107
HIDURON 102

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

HIDURON® 191 (NES 835)

DEF STAN 02: 835

HIDURON® 191 Technical Information

HIDURON^® 191 (NES 835)

HIDURON^® 191 Technical Information