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UNS S32750

UNS S32750

Super Duplex UNS S32750

Super Duplex UNS S32750 combines the most desirable characteristics of both ferritic and austenitic steels. It 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 due to its high chromium, molybdenum, and nitrogen level, with Critical Pitting Temperature exceeding 50°C.

The duplex microstructure gives this grade high strength UNS S32750 a low coefficient of thermal expansion and higher heat conductivity than austenitic steels and is suitable for working temperatures up to 300°C.

Listed in NACE MR 01 75 for sour service UNS S32750 and having gained ASME Approval for Pressure Vessel applications it can be used in a wide variety of applications.

Alloy	Common Name	Related Specifications			Tensile Strength	Proof Stress	Elongation
Alloy	Common Name	British	European	United States	Tensile Strength	Proof Stress	Elongation
Super Duplex Alloy 2507	Alloy 2507	1.4410	UNS S32750	F53	800 [116]	550 [79.8]	15

UNS S32750 Technical Information

UNS S32750 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 UNS S32750

Alloy 32750 to MLA-MPS-47V-BAR/FORG
ASTM A473 UNS S32750 Forgings
ASTM A182 Grade F53 UNS S32750 Forged Flanges
ASTM A240 UNS S32750 Sheet and Plate
ASTM A479 UNS S32750 Bar
NACE MR 01-75
EN 10088-3 1.4410
NORSOK

Downloads
Purchase Specifications >
Alloy 2507 Bar and Forgings Purchase Specification

Chemical Specification of UNS S32750

Basic Properties of UNS S32750 - Mechanical Properties

Physical Properties of UNS S32750

Applications of UNS S32750

Chemical Process Industry:

Due to its high corrosion resistance UNS S32750 is ideal for use in 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

UNS S32750 Features

Forms of UNS S32750 Available

Machining Advice of UNS S32750 - Hot worked and precipitation hardened

Alloy Comparisons

KEY Features of UNS S32750

Disclaimer
Data in this UNS S32750 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		REMAINDER	3.00		0.24	6.00			0.20	0.50
Maximum	0.030	26	0.50		5.00	1.20	0.32	8.00	0.035	0.020	0.80	1.00

0.2% Proof Stress (N/mm² ) [ksi] minimum	550[79.8]
Ultimate Tensile Strength (N/mm²) [ksi] minimum	800 [116]
Elongation (%) minimum	25
Hardness (HBN)	270 max
Reduction of Cross Section Area (%)	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 40°C	No pitting and weight loss <4.0g/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^-1)	7810
Magnetic Permeability	33
Young’s Modulus (N/mm²)	199 x 10³
Specific Heat, 20°C (J.Kg^-1.°K^-1)	475
Fracture Toughness, Kq (MPa.m)	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

Alloys	Bars & Sections	Hot & Cold Rolled Plate	Ingot & Billet	Forged Products	Sand Castings
FERRALIUM 255-SD50
FERRALIUM 255-SD40
FERRALIUM 255-3SF
FERRALIUM 255-3AF
FERRALIUM 255-3SC
FERRALIUM 255-FG46
ALLOY 2507
ALLOY S32760

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)	718 ( ST )	S31254	Alloy 32750
0.2% Proof Strength (N/mm²), minimum	450	1070	550	300	550
Corrosion Rate (mm.y^-1) Seawater	<0.01	~1	<0.01	<0.01	<0.01
Corrosion Rate (mm.y^-1) 10% sulphuric acid at 80°C	<0.4	10	>1	1.5	<0.15
Corrosion Rate (mm.y^-1) Boiling 50% nitric acid	<0.15	<0.15	<0.15	0.4	<0.15
Wear Properties related to Hardness (HBN)	RC25	RC38	RC20	RC20	RC28