Super Duplex Stainless Steel UNS S32760 (F55 / 1.4501)

Super Duplex Stainless Steel UNS S32760 (F55 / 1.4501) has excellent corrosion resistance to a wide variety of media, with outstanding resistance to pitting and crevice corrosion in seawater and other chloride containing environments, with Critical Pitting Temperature exceeding 50°C.

Providing higher strength than both austenitic and 22% Cr Super Duples Stainless Steels UNS S32760 (F55) is suited to a variety of applications in industries such as Chemical Processing, Oil & Gas, and Marine environments.

Alloy	Common Name	Related Specifications			Tensile Strength	Proof Stress	Elongation
		British	European	United States
Super Duplex Alloy S32760	Zeron 100	1.4501	UNS S32760	F55	750 [109]	550 [79.8]	25

UNS S32760 Technical Information

Specifications of UNS S32760 Alloy 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 UNS S32760

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

Basic Properties of UNS S32760- Mechanical Properties

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

Physical Properties of UNS S32760

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

Applications of UNS S32760

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

Super Duplex Plate/Sheet
Super Duplex Seamless & Welded Tube
Super Duplex Seamless & Welded Pipe
Super Duplex Round Bar
Super Duplex Flanges F55/F53
Super Duplex Specialty Forgings
Super Duplex Seamless & Welded BW Fittings

This is a Duplex alloy stainless steel designed to feature high strength, resistance to pitting, stress corrosion cracking, erosion corrosion and corrosion fatigue, crevice corrosion and strong weldability.

Super Duplex Corrosion Resistance

The high chromium and molybdenum content of Super Duplex makes it extremely resistant to uniform corrosion by organic acids like formic and acetic acid. Super Duplex also provides excellent resistance to inorganic acids, especially those containing chlorides.

The pitting Resistance equivalent of Super Duplex, calculated by PREN = Cr + 3.3Mo + 16N, will exceed 40 in most material forms.

Source: wilsonpipeline Pipe Industry Co., Limited (www.wilsonpipeline.com)

Categories: News