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S32750 Duplex Stainless Steel Pipes from China - Trusted Suppliers and Factory with Fast Delivery
Introduction
ASTM A790/A790M S32750 (2507) super duplex stainless steel pipes combine austenitic-ferritic microstructure with exceptional mechanical and corrosion properties, designed for the most aggressive offshore, chemical, and marine applications. With 24%-26% Cr, 6%-8% Ni, 3%-5% Mo, and 0.24%-0.32% N, this alloy surpasses standard duplex grades, offering PREN ≥43 for unparalleled resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
Key Features
Ultra-High Strength
Yield strength ≥550 MPa, twice the strength of 316L, enabling lightweight designs for high-pressure systems.
Superior Chloride Resistance
Excels in seawater, brine, and sour gas (H₂S) environments, outperforming 2205 duplex and 6Mo alloys.
Broad Thermal Range
Stable performance from -50°C to 300°C (-58°F to 572°F), ideal for subsea pipelines and thermal processing.
Material Specification
Standard
ASTM A790/A790M
Outside Diameter (O.D.)
1/8" NB TO 32" NB (10.29MM-812.80MM) (Customization Available)
Wall Thickness (W.T.)
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Applications
- Offshore Oil & Gas Systems
- Subsea Pipelines & Risers
- Chemical Processing Equipment
- Desalination & Seawater Systems
- Power Plant FGD Systems
- Marine & Shipbuilding
- High-Pressure Heat Exchangers
- Pulp & Bleach Plants
Ends & Processing
End: Plain End, Beveled End, Threaded
Processing: Cut-to-length; Polishing.
Processing: Cut-to-length; Polishing.
Inspection
- 100% PMI TESTED
- EN10204.3.1B MILL TEST CERTIFICATE
- THIRD PARTY INSPECTION ACCEPTED
Delivery & Packing
Condition: Cold Drawn, Annealed and Pickled / Polished / Bright Annealed / Sand blasting / Shot Blasting.
Packing: Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests.
Packing: Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests.
Marking & Specials
Marking: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per requested)
Specials: Custom sizes and specifications available on request.
Specials: Custom sizes and specifications available on request.
Specification parameters
S32750 Chemical Composition (%)
| HEAT NO. | CHEMICAL COMPOSITION (%) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| C | Mn | P | S | Si | Ni | Cr | Mo | N | Cu | ||
| STAND. | MIN. | - | - | - | - | - | 6.00 | 24.00 | 3.00 | 0.24 | - |
| MAX. | 0.03 | 1.20 | 0.035 | 0.020 | 0.8 | 8.00 | 26.00 | 5.00 | 0.32 | 0.50 | |
S32750 Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
|---|---|---|---|---|---|
| HBW | HRC | ||||
| S32750 | 800 | 550 | 15 | 300 | 32 |
Equivalent Grades (ASTM A790/A790M S32750)
| ISO | EN (Europe) | DIN (Germany) | JIS (Japan) | GB (China) | UNS (USA) | Common Name |
|---|---|---|---|---|---|---|
| X2CrNiMoN25-7-4 (ISO 15510) |
1.4410 (EN 10088-2) |
X2CrNiMoN25-7-4 (DIN 17440) |
SUS 329J4L (JIS G3463) |
022Cr25Ni7Mo4N (GB/T 21833) |
S32750 | 2507 (Super Duplex) |
ASTM A312/A312M Standard Cold Machining Size Deviation Permitted
| Nominal Outside Diameter (OD) | Nominal Wall Thickness (WT) | ||||
|---|---|---|---|---|---|
| Inches | mm | Allowable Deviation (mm) | Inches | mm / Ratio | Allowable Deviation (%) |
| 1/8" - 1 1/2" | 10.29 - 48.26 | +0.4 / -0.8 | 1/8" - 1 1/2" | (10.29 - 73.03) all of t | +20.0 / -12.5 |
| >1 1/2" - 4" | 48.26 - 114.3 | ±0.8 | 3" - 18" | (88.9 - 457.2) t/D = 5% | +22.5 / -12.5 |
| >4" - 8" | 114.3 - 219.08 | +1.6 / -0.8 | 3" - 18" | (88.9 - 457.2) t/D > 5% | +15.0 / -12.5 |
| >8" - 18" | 219.08 - 457.2 | +2.4 / -0.8 | ≥20" | =508 t of welded pipe | +17.5 / -12.5 |
| >18" - 26" | 457.2 - 660.4 | +3.2 / -0.8 | ≥20" | =508 t/D = 5% | +22.5 / -12.5 |
| >26" - 34" | 660.4 - 863.6 | +4.0 / -0.8 | ≥20" | =508 t/D > 5% | +15.0 / -12.5 |
| >34" - 48" | 863.6 - 1219.2 | +4.8 / -0.8 | - | - | - |
| Thin wall pipe (t/D=3%) ovality condition: Any cross section in a steel pipe Dmax - Dmin = 1.5% nominal, and (Dmax + Dmin)/2 conforms to the stipulated diameter tolerance range. | |||||
Comparison Table of American Standard Dimensions (ANSI B36.19 & ANSI B36.10)
| OD DN | IN | OD MM | ANSI B36.19 | ANSI B36.10 | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5s | 10s | Sched.40s | Sched.40 | Sched.80s | Sched.80 | 10 | 20 | 30 | Standard | |||||||||||
| mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | mm | Kg/m | mm | mm | Kg/m | mm | Kg/m | mm | Kg/m | mm | Kg/m | |||
| 6 | 1/8" | 10.29 | - | - | 1.24 | 0.281 | 1.73 | 0.371 | 1.73 | 2.41 | 0.467 | 2.41 | - | - | - | - | - | - | 1.73 | 0.371 |
| 8 | 1/4" | 13.72 | - | - | 1.65 | 0.499 | 2.24 | 0.644 | 2.00 | 3.02 | 0.809 | 3.02 | - | - | - | - | - | - | 2.24 | 0.644 |
| 10 | 3/8" | 17.14 | - | - | 1.65 | 0.640 | 2.31 | 0.858 | 2.31 | 3.20 | 1.118 | 3.20 | - | - | - | - | - | - | 2.31 | 0.858 |
| 15 | 1/2" | 21.34 | 1.65 | 0.814 | 2.11 | 1.016 | 2.77 | 1.260 | 2.77 | 3.73 | 1.620 | 3.73 | - | - | - | - | - | - | 2.77 | 1.260 |
| 20 | 3/4" | 26.67 | 1.65 | 1.034 | 2.11 | 1.298 | 2.87 | 1.680 | 2.87 | 3.91 | 2.190 | 3.91 | - | - | - | - | - | - | 2.87 | 1.680 |
| 25 | 1" | 33.40 | 1.65 | 1.312 | 2.77 | 2.125 | 3.38 | 2.500 | 3.38 | 4.55 | 3.230 | 4.55 | - | - | - | - | - | - | 3.36 | 2.500 |
| 32 | 1 1/4" | 42.16 | 1.65 | 1.674 | 2.77 | 2.732 | 3.56 | 3.380 | 3.56 | 4.85 | 4.460 | 4.85 | - | - | - | - | - | - | 3.56 | 3.380 |
| 40 | 1 1/2" | 48.26 | 1.65 | 1.926 | 2.77 | 3.155 | 3.68 | 4.050 | 3.68 | 5.08 | 5.400 | 5.08 | - | - | - | - | - | - | 3.68 | 4.050 |
| 50 | 2" | 60.32 | 1.65 | 2.424 | 2.77 | 3.992 | 3.91 | 5.430 | 3.91 | 5.54 | 7.470 | 5.54 | - | - | - | - | - | - | 3.91 | 5.430 |
| 65 | 2 1/2" | 73.02 | 2.11 | 3.747 | 3.05 | 5.345 | 5.16 | 8.620 | 5.16 | 7.01 | 11.400 | 7.01 | - | - | - | - | - | - | 5.16 | 8.620 |
| 80 | 3" | 88.90 | 2.11 | 4.585 | 3.05 | 6.557 | 5.49 | 11.280 | 5.49 | 7.62 | 15.250 | 7.62 | - | - | - | - | - | - | 5.49 | 11.280 |
| 90 | 3 1/2" | 101.60 | 2.11 | 5.272 | 3.05 | 7.526 | 5.74 | 13.560 | 5.74 | 8.08 | 18.620 | 8.08 | - | - | - | - | - | - | 5.74 | 13.560 |
| 100 | 4" | 114.30 | 2.11 | 5.945 | 3.05 | 8.496 | 6.02 | 16.060 | 6.02 | 8.56 | 22.290 | 8.56 | - | - | - | - | - | - | 6.02 | 16.060 |
| 125 | 5" | 141.30 | 2.77 | 9.639 | 3.40 | 11.740 | 6.55 | 21.760 | 6.55 | 9.52 | 30.920 | 9.52 | - | - | - | - | - | - | 6.55 | 21.760 |
| 150 | 6" | 168.28 | 2.77 | 11.514 | 3.40 | 14.037 | 7.11 | 28.230 | 7.11 | 10.97 | 42.520 | 10.97 | - | - | - | - | - | - | 7.11 | 28.230 |
| 200 | 8" | 219.08 | 2.77 | 15.049 | 3.76 | 20.334 | 8.18 | 42.490 | 8.18 | 12.70 | 64.570 | 12.70 | - | - | 6.35 | 33.28 | 7.04 | 36.80 | 8.18 | 42.400 |
| 250 | 10" | 273.05 | 3.40 | 23.028 | 4.19 | 28.290 | 9.27 | 60.240 | 9.27 | 12.70 | 81.460 | 15.09 | - | - | 6.35 | 41.70 | 7.80 | 51.00 | 9.27 | 60.240 |
| 300 | 12" | 323.85 | 3.96 | 31.806 | 4.57 | 36.633 | 9.52 | 73.760 | 10.31 | 12.70 | 97.360 | 17.48 | - | - | 6.35 | 49.68 | 8.38 | 65.14 | 9.52 | 73.760 |
| 350 | 14" | 355.60 | 3.98 | 34.990 | 4.78 | 42.102 | 9.52 | - | 11.13 | - | - | 19.05 | 6.35 | 54.63 | 7.92 | 67.98 | 9.52 | 81.21 | 9.52 | 81.210 |
| 400 | 16" | 406.40 | 4.19 | 42.350 | 4.78 | 48.220 | 9.52 | - | 12.70 | - | - | 21.44 | 6.35 | 62.58 | 7.92 | 77.90 | 9.52 | 93.13 | 9.52 | 93.180 |
| 450 | 18" | 457.20 | 4.19 | 47.700 | 4.78 | 54.300 | 9.52 | - | 14.27 | - | - | 23.82 | 6.35 | 70.50 | 7.92 | 87.80 | 11.13 | 122.12 | 9.52 | 105.050 |
| 500 | 20" | 508.00 | 4.77 | 60.320 | 5.54 | 69.766 | 9.52 | - | 15.09 | - | - | 26.19 | 6.35 | 78.47 | 9.52 | 116.97 | 12.70 | 155.00 | 9.52 | 116.970 |
| 550 | 22" | 558.80 | 4.77 | - | 5.54 | - | 9.52 | - | - | - | - | 28.58 | 6.35 | 86.42 | 9.52 | 128.89 | 12.70 | 170.86 | 9.52 | 128.890 |
| 600 | 24" | 609.60 | 5.54 | 84.100 | 6.35 | 96.215 | 9.52 | - | 17.48 | - | - | 30.96 | 6.35 | 96.215 | 9.52 | 140.80 | 14.70 | 209.54 | 9.52 | 140.810 |
| 650 | 26" | 660.40 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 127.58 | 12.70 | 202.65 | - | - | 9.52 | 152.730 |
| 700 | 28" | 711.20 | - | - | - | - | 9.52 | - | - | - | - | - | 7.92 | 137.52 | 12.70 | 218.54 | 15.88 | 271.94 | 9.52 | 164.650 |
| 750 | 30" | 762.00 | 6.35 | 120.590 | 7.92 | 147.450 | 9.52 | - | - | - | - | - | 7.92 | 147.45 | 12.70 | 234.44 | 15.88 | 291.81 | 9.52 | 176.570 |
| 800 | 32" | 812.00 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 157.39 | 12.70 | 250.33 | 15.88 | 311.67 | 9.52 | 188.500 |
| 850 | 34" | 863.60 | - | - | - | - | 9.52 | - | 17.48 | - | - | - | 7.92 | 167.32 | 12.70 | 266.22 | 15.88 | 331.54 | 9.52 | 200.420 |
| 900 | 36" | 914.40 | - | - | - | - | 9.52 | - | 19.05 | - | - | - | 7.92 | 177.26 | 12.70 | 282.18 | 15.88 | 351.41 | 9.52 | 212.340 |
Frequently Asked Questions (FAQ)
What is the ASTM A790 S32750 standard?
ASTM A790/A790M S32750 (commonly known as 2507 Super Duplex) is a standard specification for seamless and welded austenitic-ferritic duplex stainless steel pipes, optimized for high strength and exceptional corrosion resistance in harsh environments.
What chemical elements give S32750 its high corrosion resistance?
S32750 contains 24%-26% Chromium (Cr), 6%-8% Nickel (Ni), 3%-5% Molybdenum (Mo), and 0.24%-0.32% Nitrogen (N). This specific chemical configuration provides a Pitting Resistance Equivalent Number (PREN) of ≥43, making it highly resistant to chloride pitting and crevice corrosion.
What are the mechanical properties of S32750 super duplex pipes?
S32750 features a minimum Yield Strength (0.2% Proof) of 550 MPa, a minimum Tensile Strength of 800 MPa, a minimum Elongation of 15%, and a maximum hardness of 300 HBW / 32 HRC. This high strength allows for lighter wall thicknesses compared to standard austenitic grades.
What are the equivalent grades of ASTM A790 S32750?
S32750 equivalent grades include 1.4410 (EN Europe), X2CrNiMoN25-7-4 (DIN Germany/ISO), SUS 329J4L (JIS Japan), and 022Cr25Ni7Mo4N (GB China), commonly referred to under the trade name 2507 Super Duplex.
What are the main applications of S32750 pipes?
Due to its superior chloride resistance and high strength, S32750 is widely used in offshore oil & gas systems, subsea pipelines & risers, desalination plant seawater systems, chemical processing equipment, power plant FGD systems, and high-pressure heat exchangers.
What size tolerances and deviations are permitted under ASTM standards?
Outside diameter and wall thickness tolerances are defined by standard cold machining size deviation limits (e.g., ASTM A312/A312M-09). For example, nominal ODs from 1/8" to 1 1/2" permit a deviation of +0.4mm / -0.8mm, while wall thickness tolerances range between +15% and +22.5% depending on the t/D ratio.