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S32750 Duplex Stainless Steel Tube - China Factory Suppliers | Immediate Shipment 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,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 0.065in. [1.65mm] 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)
Q1: What is the main application standard for S32750 sanitary tubing?
ASTM A270/A270M is the standard specification covering seamless and welded austenitic and ferritic/austenitic stainless steel sanitary tubing, which is widely utilized in high-purity and hygienic environments.
Q2: Why is S32750 preferred over standard 316L stainless steel?
S32750 offers a yield strength approximately 2.5 times higher than 316L, allowing for thinner-walled tubing designs. Additionally, its high PREN value (~40-43) provides significantly superior corrosion resistance in high-chloride and aggressive environments.
Q3: In what industries is ASTM A270 S32750 tubing typically used?
It is primarily used in industries requiring high purity and corrosion resistance under aggressive environments, such as pharmaceutical and biopharmaceutical manufacturing, food and beverage processing, cosmetics production, high-purity water/steam systems, and marine sanitary systems.
Q4: What is the chemical composition requirement for S32750?
According to standard specifications, S32750 contains 24.00% to 26.00% Chromium (Cr), 6.00% to 8.00% Nickel (Ni), 3.00% to 5.00% Molybdenum (Mo), and 0.24% to 0.32% Nitrogen (N), ensuring its strong super duplex characteristics.
Q5: What inspection and testing options are available for these tubes?
The tubing is 100% PMI tested and accompanied by an EN10204.3.1B Mill Test Certificate. Third-party inspections are also fully accepted to guarantee material quality and compliance.
Q6: What delivery conditions can be requested for S32750 sanitary tubing?
The tubes can be delivered in various conditions, including Cold Drawn, Annealed and Pickled, Polished, Bright Annealed, Sand blasted, or Shot Blasting, depending on the client's processing requirements.