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S32750 Duplex Stainless Steel Tube - China Suppliers and Factory - Fast Delivery 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 | |
| Mechanical Properties | |||||
|---|---|---|---|---|---|
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| S32750 | 655 | 485 | 25 | HRW | |
| C32 | |||||
| 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 | ||||||
|---|---|---|---|---|---|---|
| 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)
Q:
What is S32750 super duplex stainless steel?
S32750 (also known as UNS S32750 or Zeron 100) is a super duplex stainless steel featuring a balanced austenitic-ferritic microstructure. It provides exceptional mechanical strength and superior corrosion resistance compared to standard duplex and austenitic grades.
Q:
Why is ASTM A270 S32750 preferred for sanitary applications?
It is ideal for extreme hygiene environments because it handles high chloride levels (>1,000 ppm) and low pH levels (
Q:
What are the key chemical composition limits of S32750?
According to the standards, 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 high pitting resistance.
Q:
What mechanical properties does S32750 offer?
It features a minimum tensile strength of 655 MPa, a minimum 0.2% proof yield strength of 485 MPa, a minimum elongation of 25% in 50mm, and a maximum hardness of C32.
Q:
What standard inspections are performed on these tubes?
The tubing undergoes 100% PMI (Positive Material Identification) testing and is supplied with an EN10204.3.1B Mill Test Certificate. Third-party inspections are also accepted.