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S32750 Duplex Stainless Steel Tube Suppliers and Factory in China – Fast Delivery and Stock Available
Introduction
ASTM A270 covers seamless and welded austenitic stainless steel tubing for sanitary applications in industries requiring high purity and corrosion resistance. S32750 (also known as UNS S32750 or Zeron 100) is a super duplex stainless steel with an austenitic-ferritic microstructure, offering exceptional corrosion resistance, strength, and durability.
S32750 is the preferred choice for extreme hygiene environments where both aggressive corrosion risks (e.g., high Cl⁻, low pH) and mechanical stress (e.g., high-pressure systems) are present. Its combination of super duplex properties ensures longevity and compliance in the most demanding sanitary applications.
Key Features
Exceptional Corrosion Resistance
PREN (Pitting Resistance Equivalent Number) of ~40–43, surpassing standard duplex (e.g., S32205) and austenitic grades. Resists corrosion in environments with Cl⁻ > 1,000 ppm or low pH (e.g., pH < 3).
Superior Mechanical Strength
Yield strength ~2.5× higher than 316L stainless steel, enabling thinner-walled tubing for the same pressure rating. Reduces material costs and installation complexity in large-scale systems.
Hygienic and Low-Maintenance Design
Electropolished surfaces minimize biofilm formation, critical for preventing microbial contamination in long-term use. Reduces the need for frequent disassembly and manual cleaning.
Temperature Stability
Performs reliably in wide temperature ranges (-20°C to 300°C), making it suitable for hot CIP cycles (e.g., 130°C steam) and cold storage systems (e.g., glycol-cooled lines at -10°C).
Material Specification
Standard:
ASTM A270/A270M
O.D:
1/8" NB TO 32" NB, (10.29MM-812.80MM), (Customization Available)
W.T:
SCH 10S, SCH 40S, SCH 80S, SCH160, SCH XXS (Customization Available)
Application:
- Pharmaceutical and Biopharmaceutical Manufacturing
- Food and Beverage Industry (Aggressive Environments)
- Cosmetics and Personal Care Production
- High-Purity Water and Steam Systems
- Marine and Offshore Sanitary Systems
End:
Plain End, Beveled End, Threaded
Processing:
Cut-to-length; Polishing.
Inspection:
- 100% PMI TESTED
- EN10204.3.1B MILL TEST CERTIFICATE
- THIRD PARTY INSPECTION ACCEPTED
Delivery Condition:
Cold Drawn, Annealed and Pickled/ Polished /Bright Annealed/ Sand blasting/ Shot Blasting.
Marking:
All SS SMLS Pipes are marked as follows: Standard, Grade, OD, Thickness, Length, Heat No. (Or as per the customer’s request)
Packing:
Packed in Wooden Boxes, plywood cases, Steel Strips Bundled, or as per Customers Requests
Specials:
Sizes and Specifications other than above can be customized 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. | 0.030 | 1.20 | 0.035 | 0.020 | 0.8 | 8.00 | 26.00 | 5.00 | 0.32 | 0.50 | |
S32750 Mechanical Properties
| Mechanical Properties | ||||
|---|---|---|---|---|
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness (HRW) |
| S32750 | 655 | 485 | 25 | C32 |
Equivalent Grades - (ASTM A270/A270M S32750 Equivalent Grades)
| ASTM A270/A270M S32750 (UNS S32750 / 2507) Equivalent Grades | ||||||
|---|---|---|---|---|---|---|
| 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 A269/A269M Standard Cold Machining Size Deviation Permitted
| ASTM A269/A269M Standard cold machining size deviation permitted | ||||||
|---|---|---|---|---|---|---|
| Group | Size, Outside Diameter, in. [mm] | Permissible Variations in Outside Diameter, in. [mm] | Permissible Variations in Wall Thickness, A% | Permissible Variations in Cut Length, in. [mm] B | Thin Walled Tubes C | |
| Over | Under | |||||
| 1 | Up to 1/2 [13] | ±0.005 [0.13] | ±15 | 1/8 [3.2] | 0 | ... |
| 2 | 1/2 to 1 1/2 [13 to 38], excl | ±0.005 [0.13] | ±10 | 1/8 [3.2] | 0 | less than 0.065 in. [1.65 mm] nominal |
| 3 | 1 1/2 to 3 1/2 [38 to 89], excl | ±0.010 [0.25] | ±10 | 3/16 [4.8] | 0 | less than 0.095 in. [2.41 mm] nominal |
| 4 | 3 1/2 to 5 1/2 [89 to 140], excl | ±0.015 [0.38] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 5 | 5 1/2 to 8 [140 to 203], excl | ±0.030 [0.76] | ±10 | 3/16 [4.8] | 0 | less than 0.150 in. [3.81 mm] nominal |
| 6 | 8 to 12 [203 to 305], excl | ±0.040 [1.01] | ±10 | 3/16 [4.8] | 0 | less than 0.200 in. [5.08 mm] nominal |
| 7 | 12 to 14 [305 to 356], excl | ±0.050 [1.26] | ±10 | 3/16 [4.8] | 0 | less than 0.220 in. [5.59 mm] nominal |
Frequently Asked Questions (FAQ)
What is ASTM A270 S32750?
ASTM A270 S32750 (also known as UNS S32750 or Zeron 100) is a high-performance super duplex stainless steel tubing designed for sanitary applications. It features an austenitic-ferritic microstructure that provides exceptional strength and superior corrosion resistance in high-purity environments.
What makes S32750 superior to standard 316L stainless steel?
S32750 offers a yield strength that is approximately 2.5 times higher than standard 316L stainless steel. This allows for thinner-walled tubing designs under the same pressure ratings. Additionally, its high PREN rating (~40-43) offers far superior resistance to pitting and crevice corrosion in aggressive chloride environments.
In which industries is ASTM A270 S32750 tubing used?
It is primarily used in high-purity and sanitary industries, including pharmaceutical and biopharmaceutical manufacturing, food and beverage processing, cosmetics production, high-purity water and steam systems, and marine/offshore sanitary systems.
What are the equivalent international grades for S32750?
Equivalent grades include EN 1.4410 (Europe), DIN X2CrNiMoN25-7-4 (Germany), JIS SUS 329J4L (Japan), and GB 022Cr25Ni7Mo4N (China). It is also commonly known as 2507 or Super Duplex.
What inspections and tests are performed on this tubing?
The tubing undergoes 100% PMI (Positive Material Identification) testing. It is supplied with an EN10204.3.1B Mill Test Certificate, and third-party inspections are accepted to ensure high quality and compliance.