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F55 Super Duplex

F55 Super Duplex

F55 Super Duplex from Langley Alloys is NORSOK approved and has a minimum pitting resistance equivalent number of 40. Having enhanced pitting and crevice corrosion resistance compared with the ordinary austenitic or duplex types F55 Super Duplex is suitable for a variety of applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.

F55 Super Duplex is currently used for chemical tanks, refineries, marine shafts, pressure vessel parts, paper manufacture, seawater desalination plants and many other applications.

F55 Super Duplex is listed in NACE MR 01 75 for sour service and having gained ASME Approval for Pressure Vessel applications.

Alloy	Common Name	Related Specifications			Tensile Strength	Proof Stress	Elongation
Alloy	Common Name	British	European	United States	Tensile Strength	Proof Stress	Elongation
F55 Super Duplex	Zeron 100	1.4501	F55 Super Duplex	F55	750 [109]	550 [79.8]	25

F55 Super Duplex Technical Information

UNS 32760 Bar stock sizes available
Diameter (in)	Diameter (mm)	kg per m
1	25.4	3.97
1 1/4	31.75	6.17
1 1/2	38.1	8.89
1 3/4	44.45	12.1
2	50.8	15.84
2 1/4	57.15	20.04
2 1/2	63.5	24.73
2 3/4	69.85	29.91
3	76.2	35.62
3 1/4	82.55	41.79
3 1/2	88.9	48.48
3 3/4	95.25	55.63
4	101.6	63.3
4 1/2	114.3	80.13
5	127	98.92
5 1/2	139.7	119.69
6	152.4	142.45
7	177.8	193.88
8	203.2	253.22
9	228.6	320.46
10	254	395.63
12	304.8	569.7
14	355.6	775.46

Specifications of F55 Super Duplex

UNS 32760 to MLA-MPS-48V-BAR/FORG
EN 10088-3 1.4501
ASTM A473 UNS S32760 Forgings
ASTM A182 Grade F55 UNS S32760 Forged Flanges
ASTM A240 UNS S32760 Sheet and Plate
ASTM A479 UNS S32760 Bar
ASTM A276 UNS S32760 Condition A
NACE MR 01-75

Chemical Specification of F55 Super Duplex

Basic Properties of F55 Super Duplex- Mechanical Properties

Physical Properties of F55 Super Duplex

Applications of F55 Super Duplex

Chemical Process Industry:

Nitric Acid Processes, Polypropylene Production, PVC Production, Dioxide, Caustic Evaporators, Equipment

Handling Organic and Fatty Acids

Marine Industry and Shipbuilding:

Propellers and Shafts, Rudders, Shaft Seals, Pumps, Bolts and Fasteners, Valves, Instrumentation, Oil and Chemical Tankers

Oil and Gas Industry:

Pumps, Valves, Pipe, Vessels, Wellhead Equipment, Subsea Equipment

Pollution Control:

Fans and pumps, Wet Scrubbers, Incinerators

Pulp and Paper Industry:

Black liquor heater tubes, Digester Blow Valves, Rotary Feed Valves, I.D.Fans, Brownstock Washers, Precipitators, Bleaching Components

Food Industry:

Sugar Cane Centrifuges, Corn and Vegetable processing plant

Agrochemicals:

Fertiliser Production (Wet phosphoric acid)

Civil Engineering:

Sewage Treatment

F55 Super Duplex Features

Forms of F55 Super Duplex Available

Forms of F55 Super Duplex Available - Hot worked and precipitation hardened

Alloy Comparisons

KEY Features of F55 Super Duplex

Disclaimer
Data in this F55 Super Duplex 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	C	Cr	Cu	Fe	Mo	Mn	N	Ni	P	S	Si	W
Minimum		24.0	0.5	REMAINDER	3.0		0.20	6.00				0.50
Maximum	0.030	26.00	1.0		4.0	1.0	0.30	8.00	0.030	0.010	1.00	1.00

0.2% Proof Stress (N/mm² ) [ksi] minimum	550 [79.8]
Ultimate Tensile Strength (N/mm²) [ksi] minimum	750 [108.8]]
Elongation (%) minimum	25
Hardness (HBN)	270max
Reduction of Cross Section Area (%) minimum	45
Charpy V-notch Impact at ambient Temp (J) [ft.lb]	80min [59min]
Charpy V-notch Impact at -46°C (J) [ft.lb]	45av, 35min [33av, 25.8min]

Additional Testing
ASTM G48A Corrosion test at 50°C	No pitting and weight loss <0.8g/m2
Ultrasonic Testing	According to ASTM A388
Ferrite Content	35%-55%
Microstructure	Microstructure certified free from grain boundary carbides, sigma, chi and laves phases

Density (Kg.m^-3)	7810
Magnetic Permeability	33
Young’s Modulus (N/mm²)	199 x 10³
Fracture Toughness, KQ (MPa.m½)	98
Specific Heat, 20°C (J.Kg^-1.°K^-1)	475
Specific Electrical Resistance, 20°C (µO.m)	0.80
Thermal conductivity, 20°C (W.m^-1.°K^-1)	14.2
Mean coefficient of thermal expansion, 20-100°C (°K^-1)	11.1 x 10^-6

Operation	Cutting Speed m/min (ft/min)	Feed Rate mm/rev (in/rev)	Depth of cut mm (in)
Milling	40 (130)	0.05-0.13 mm/tooth 0.02-0.005 in/tooth	0.5-6.0 (0.02-0.25)
Drilling – 6.4mm (1/4”) dia	250rpm	0.075 (0.003)
Drilling – 12.7mm (1/2”) dia	250rpm	0.125 (0.005)
Drilling – 25.4mm (1”) dia	150rpm	0.28 (0.011)
Turning - Roughing	30- 45 (100-150)	0.20 – 0.38 (0.008-0.015)	3 (0.125)
Turning - Finishing	50- 60 (165-200)	0.13 – 0.20 (0.005-0.008)	0.5 (0.02)
Tooling	Milling/Turning: Carbide (SANDVIK GC 235, SECO T25M) Drilling: HSS, point angle 118°, chisel angle 120°

Alloy Comparisons	S31803	S17400(17-4PH)	S31254	718 (ST)	UNS 32760
0.2% Proof Strength (N/mm²), minimum	450	1070	300	550 max	550
Corrosion Rate (mm.y^-1) Seawater	~1	~1	<0.01	<0.01	<0.01
Corrosion Rate (mm.y^-1) 10% sulphuric acid at 80°C	10	10	0.4	<0.15	<0.15
Corrosion Rate (mm.y^-1) Boiling 50% nitric acid	<0.15	<0.15	<0.15	<0.15	<0.15
Wear Properties related to Hardness (HRC)	RC38	RC38	RC20	RC20	RC28