ASTM A790 UNS S32750 Pipe.PDF

ASTM A790 UNS S32750 Pipe is a super duplex stainless steel pipe manufactured to ASTM A790/A790M, which covers seamless and straight-seam welded ferritic-austenitic stainless steel pipes for corrosive service. Also known as 2507 (EN 1.4410), S32750 typically contains 24–26% chromium, 6–8% nickel, 3–5% molybdenum, and 0.24–0.32% nitrogen. Under ASTM A790 requirements, its minimum tensile strength is 800 MPa, minimum yield strength is 550 MPa, and minimum elongation is 15%. These properties make it suitable for demanding applications such as seawater desalination, offshore oil and gas, and chemical processing, where high strength and resistance to pitting and stress corrosion cracking are important.

Click to download ASTM A790 UNS S32750.PDF

 

ASTM A790 UNS S32750 Equivalent materials

Technical item	Specification
Product name	ASTM A790 UNS S32750 Pipe
Common grade name	Super Duplex 2507
UNS designation	S32750
EN material number	1.4410
Common commercial designation	F53
Material family	Super duplex stainless steel
Product standard	ASTM A790 / ASME SA-790, as specified
Manufacturing methods	Seamless or welded, subject to specification and availability
Typical alloy system	25Cr–7Ni–4Mo–N
Common applications	Offshore piping, seawater systems, desalination, chemical processing, oil and gas
Typical corrosion indicator	PREN generally above 40; actual value depends on chemistry and formula

 

Chemical composition is one of the first checks in a Super Duplex 2507 purchase. The high chromium, molybdenum, and nitrogen content helps explain the grade's corrosion resistance, while the heat-specific chemical analysis confirms whether the supplied material meets the required limits.

Element	Symbol	Min (%)	Max (%)	Typical (%)
Carbon	C	-	0.030	0.020
Silicon	Si	-	0.80	0.45
Manganese	Mn	-	1.20	0.85
Phosphorus	P	-	0.035	0.022
Sulfur	S	-	0.020	0.001
Chromium	Cr	24.0	26.0	25.1
Nickel	Ni	6.0	8.0	7.0
Molybdenum	Mo	3.0	5.0	3.8
Nitrogen	N	0.24	0.32	0.28
Copper	Cu	-	0.50	0.20
Iron	Fe	-	Balance	Balance

 

What is the PREN of UNS S32750?

The Pitting Resistance Equivalent Number (PREN) is a comparative metric commonly used to evaluate the pitting corrosion resistance of stainless steel grades. It is typically calculated using the following formula:
PREN = %Cr + 3.3(%Mo) + 16(%N)
Based on typical compositional values-25% chromium, 4% molybdenum, and 0.28% nitrogen-the calculated PREN is approximately 42.7. It should be noted, however, that the PREN does not guarantee the material's performance in all service environments.

 

ASTM A790 specifies mechanical requirements for the pipe. The following table summarizes the principal room-temperature tensile and hardness requirements commonly listed for UNS S32750 pipe. Confirm the current standard and test requirements for the specific order.

Mechanical property	Requirement	Unit / test basis
Tensile strength	800 minimum	MPa
0.2% yield strength	550 minimum	MPa
Elongation	15 minimum	% in 50 mm (2 in.) gauge length
Brinell hardness	300 maximum	HBW
Rockwell hardness	32 maximum	HRC
Typical density	Approximately 7.8	g/cm³
Typical elastic modulus	Approximately 200	GPa

The density and elastic modulus are typical reference values, not acceptance criteria under ASTM A790. Mechanical properties can vary with product condition, wall thickness, and applicable test provisions.

 

ASTM A790 covers the material and product requirements for duplex stainless steel pipe. Nominal pipe dimensions and schedules are generally selected using the applicable dimensional standard, such as ASME B36.19M where specified.

The following table provides representative dimensions for common NPS sizes. These are dimensional references, not a guarantee that every size and schedule is available in UNS S32750.

NPS	Outside diameter (mm)	SCH 10S wall (mm)	SCH 40S wall (mm)	SCH 80S wall (mm)
1/2"	21.34	2.11	2.77	3.73
1"	33.40	2.77	3.38	4.55
2"	60.33	2.77	3.91	5.54
3"	88.90	3.05	5.49	7.62
4"	114.30	3.05	6.02	8.56
6"	168.28	3.40	7.11	10.97
8"	219.08	3.76	8.18	12.70
10"	273.05	4.19	9.27	12.70
12"	323.85	4.57	9.53	12.70

 

ASTM A790 UNS S32750 Pipe Dimensional Tolerances

Tolerances are in accordance with ASTM A999 / A999M (general requirements) unless a more restrictive value is agreed at the time of order.

Outside Diameter Tolerance

NPS	Outside Diameter Range (mm)	Tolerance (mm)
1/8 – 1½	10.3 – 48.3	+0.4 / -0.8
Over 1½ – 4	48.3 – 114.3	+0.8 / -0.8
Over 4 – 8	114.3 – 219.1	+1.6 / -0.8
Over 8 – 18	219.1 – 457.2	+2.4 / -0.8
Over 18 – 26	457.2 – 660.4	+3.2 / -0.8
Over 26 – 34	660.4 – 863.6	+3.2 / -1.6
Over 34 – 48	863.6 – 1219.2	+4.0 / -1.6

Wall Thickness Tolerance

Manufacturing Route	Tolerance
Seamless, hot finished	± 12.5% of nominal wall
Seamless, cold drawn	± 10% of nominal wall
Welded (with filler / without filler)	± 10% of nominal wall
Minimum-wall ordering	0 / +22.5% (average wall control)

Length, Straightness & Form Tolerances

Parameter	Tolerance
Specific length (up to 6 m)	+10 / -0 mm
Specific length (over 6 m)	+15 / -0 mm
Single random length	4 000 – 7 000 mm
Double random length	7 000 – 13 000 mm
Straightness	max. 0.5 mm per 1 m (0.05%)

 

Theoretical unit weight is calculated from the nominal outside diameter and wall thickness. Actual weight is
subject to the tolerances given in Section 08.
Metric: W (kg/m)= 0.02466 x t x (D - t), where D = OD (mm), t= wall (mm).
Imperial: W (lb/ft) = 10.69 x t x (D - t), where D, t are in inches.

NPS	OD (mm)	Wall (mm)	Sch	kg/m	lb/ft
1/2	21.3	2.77	40S	1.27	0.85
3/4	26.7	2.87	40S	1.69	1.13
1	33.4	3.38	40S	2.50	1.68
1½	48.3	3.68	40S	4.05	2.72
2	60.3	3.91	40S	5.44	3.66
2	60.3	5.54	80S	7.48	5.03
3	88.9	5.49	40S	11.29	7.59
3	88.9	7.62	80S	15.27	10.27
4	114.3	6.02	40S	16.07	10.81
4	114.3	8.56	80S	22.32	15.01
6	168.3	7.11	40S	28.26	19.00
6	168.3	10.97	80S	42.56	28.62
8	219.1	8.18	40S	42.55	28.61
8	219.1	12.70	80S	64.64	43.46
10	273.1	9.27	40S	60.31	40.56
10	273.1	15.09	80S	96.01	64.56
12	323.9	10.31	40S	79.73	53.62
12	323.9	17.48	80S	132.08	88.83
14	355.6	11.13	40S	94.55	63.59
14	355.6	19.05	80S	158.10	106.34
16	406.4	12.70	40S	123.30	82.94
16	406.4	21.44	80S	203.53	136.90
18	457.0	14.27	40S	155.81	104.80

Item	Standard Supply Condition
Heat Treatment	Solution annealed at 1025 – 1125°C, followed by rapid water quenching
Microstructure	Balanced ferrite / austenite, typically 35 – 65% ferrite
Surface	Pickled and passivated (acid cleaned) unless otherwise specified
Straightness	Straightened to max. 0.5 mm per 1 m
Ends	Plain or beveled end; protected with plastic caps
Marking	Grade, standard, size, heat number, manufacturer and specification
Certification	EN 10204 3.1 Mill Test Certificate, or 3.2 on request
Delivery State	Annealed and pickled (as per the certificate in Section 03)

 

 

End Form	Abbrev.	Description	Typical Use
Plain End	PE	Square-cut, deburred ends; no bevel	Small sizes, socket or compression fittings
Beveled End	BE	30° +5/-0° bevel, root face 1.6 mm	Butt-welded pipework (standard for large sizes)
Threaded End	TE	NPT / BSP threads, with or without coupling	Screwed connections, low-pressure service
Coupling	-	Threaded coupling attached to one or both ends	Oilfield and water lines
Grooved End	-	Rolled or cut grooves for mechanical couplings	Fast-assembly piping systems
Flanged End	-	Weld-neck or slip-on flange fitted	Connection to equipment and valves

Beveled End Details

Wall Thickness (mm)	Bevel Angle	Root Face (mm)	Root Gap (mm)
6.0 max	37.5° ± 2.5°	1.6 ± 0.8	1.6 – 2.4
6.0 – 12.7	30° +5/-0°	1.6 ± 0.8	1.6 – 3.2
over 12.7	30° +5/-0°	2.4 ± 0.8	2.4 – 4.0

 

 

GNEE supplies a comprehensive range of Super Duplex 2507 (UNS S32750) products sourced fromreputable mills. All products are supplied with full material certification and full traceability from heat numberto finished item.

Every UNS S32750 pipe is supplied with a full EN 10204 3.1 Mill Test Certificate, and 3.2 certification withthird-party witness is available on request. Full traceability is maintained from heat number to finished item.

 

Marking

Each length is ink-marked with grade (UNS S32750), standard (ASTM A790), size, wall thickness, heatnumber, manufacturer and specification, as shown on the pipe photograph in Section 13. Example: A790
UNS S32750 SMLS PIPE 6" x SCH40S HEAT NO.: FK2305-173

Delivery & Shipping

Lead time: stock items 3 - 7 days; production orders 15 - 45 days
Ports of loading: Shanghai, Ningbo, Qingdao, Tianjin, Guangzhou
· Transport: sea freight (FCL /LCL), air freight, express courier, China-Europe rail
. Trade terms: EXW, FOB, CIF, CFR, DAP, DDP
Payment terms: T/T, L/C at sight, Western Union, Trade Assurance

 

GNEE quotation checklist

Required information	What to provide
Grade	UNS S32750 / Super Duplex 2507
Standard	ASTM A790/A790M, with edition if specified
Construction	Seamless, welded, or EFW where applicable
Dimensions	NPS × schedule or OD × wall thickness
Length	Random, double random, or specified cut length
Quantity	Pieces, meters, or metric tons
Testing	MTC, dimensional inspection, PMI, hydrotest, NDT, or other specified tests
Certification	EN 10204 Type 3.1 or other agreed documentation, if required
Destination	Country, port, and agreed Incoterm
Delivery deadline	Required shipment or arrival date

Request a quotation: Send your pipe list, drawings, or technical specification to GNEE. A complete RFQ makes it easier to check the required dimensions, product standard, inspection scope, and availability before pricing.

Request a quotation