Your Professional Stainless Steel Pipe/Duplex Stainless Steel PipeSuppliers
We are a dedicated manufacturer of stainless steel pipe and duplex stainless steel pipe (304/L, 316/L, 317L, 321, 310S, duplex 2205 and super duplex 2507) to ASTM A312, A789, A790 and A213. Our integrated mill covers steelmaking, hot piercing, cold drawing, solution annealing and machining under one roof, with annual capacity exceeding 3500000 tons and a size range from 1/2″ to 48″ (seamless to 24″, welded/EFW to 110″). Quality is assured by ISO 9001, PED 2014/68/EU and CE certification, supported by EN 10204 3.1 mill certificates, third-party inspection (SGS/BV/TÜV) and NACE MR0175 / ISO 15156 compliance on request.
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SP400 Pipe Coating RobotThe SP400 pipe coating robot delivers PLC-controlled, servo-driven internal and external pipe coating for diameters 400–1300 mm. Remote height adjustment, 12 preset modes, 80 m reach. Full specs -
![SP300 Manual-Pull Internal Pipe Coating Machine | 360° Spraying]()
SP300 Manual-Pull Internal Pipe Coating Machine | 360° SprayingSP300 manual-pull internal pipe coating machine for 300–1400 mm pipes. Features servo-driven 360° rotation and high-pressure airless spraying. -
![SP300Ultra Pipe Inner-Wall Spraying Robot]()
SP300Ultra Pipe Inner-Wall Spraying RobotThe SP300Ultra is a robot built to coat the inside of a pipe without ever sending a worker into a confined space. It travels the bore, carries a rotating spray head, and lays a uniform anti-corrosion
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Why choose us
One-Stop Customized Solutions
We are committed to providing customers with one-stop customized solutions - from design support and precision manufacturing to quality assurance - to meet the diverse needs of various industries for high-performance, high-precision, and high-reliability industrial components.
Certification
We ensure quality through comprehensive system certifications: the company has passed the ISO 9001:2015 quality management system certification and the American Petroleum Institute (API) quality certification system.
Sales Market
Our products have been successfully exported to many countries and regions around the world, including the United States, Canada, Germany, India, Malaysia, Pakistan, the United Arab Emirates, Egypt, and the Middle East. We have earned the trust and praise of overseas customers.
On-Site Quality Supervision
We dispatch professional quality inspection teams to supervise the production of steel pipe fittings and rubber hoses. From raw material entry to the shipment of finished products, we maintain strict quality control throughout the process and accommodate special customer requirements, such as product identification and packaging methods.
ASTM-A312 Grade TP321 Seamless Stainless Steel Pipe is an austenitic stainless steel seamless pipe manufactured according to ASTM A312/A312M and identified by UNS S32100. TP321 is a titanium-stabilized stainless steel grade designed for high-temperature and general corrosive service.
Product Parameters
|
Item |
Details |
|
Product Name |
Stainless steel seamless pipes |
|
Standards |
Compliant with ASTM, DIN, ISO, EN, JIS, GB and other international or national standards. |
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Material Grades |
200 Series: 201, 201L, 201LN, 202, etc.; |
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Surface Finish |
Options include polished, annealed, pickled, bright, brushed, satin, or mirror finish, according to customer preference. |
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Type |
Available in hot rolled, cold rolled, or cold drawn variants. |
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Size Range |
Outer diameters range from 6mm up to 630mm; wall thickness varies between 0.5mm and 60mm; lengths can be customized or provided in standard sizes such as 5.8m, 6m, 11.8m, or 12m. |
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Tolerance |
Manufactured with dimensional tolerances meeting relevant standards or tailored to specific client requirements, such as ASTM A269, ASTM A312, EN 10216-5, etc. |
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Mechanical Properties |
Mechanical strength, yield properties, and elongation comply with applicable specifications to ensure performance in intended applications. |
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Chemical Composition |
Fulfills chemical requirements for 304 grade stainless steel, typically containing a maximum of 0.08% C, 18.0-20.0% Cr, and 8.0-11.0% Ni, among other elements. |
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Testing & Inspection |
Pipes undergo rigorous quality checks including hydrostatic tests, eddy current inspections, ultrasonic examinations, dimensional verification, and surface quality assessments. |
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Applications |
Widely used for fluid conveyance, heat exchanger tubing, petrochemical installations, food processing machinery, pharmaceutical equipment, boilers, pressure vessels, structural applications, and various industrial uses. |
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Price Terms |
Trade terms offered include FOB, CIF, CFR, CNF, EXW, and other options depending on customer requirements. |
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Payment Terms |
Accepted payment methods include T/T, L/C, D/P, and others as negotiated. |
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Delivery Time |
Timely shipment available for stocked items; delivery schedules for production orders are arranged as per order size and specifics. |
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Packing |
Packed in seaworthy export packaging, including protective plastic film, moisture-resistant materials, wooden crates or pallets, steel strapping, or tailored packing as requested by clients. |
Surface Finish of TP321 Seamless Pipe
| Surface Finish | Main Purpose | Typical Appearance | Suitable for |
|---|---|---|---|
| Pickled | Remove scale | Silver/gray metallic | General industrial applications |
| Annealed & Pickled (AP) | Heat treatment + scale removal | Clean metallic surface | Industrial piping |
| Bright Annealed (BA) | Bright and clean surface | Bright metallic | Heat exchangers / demanding applications |
| Blasted | Surface cleaning | Uniform matte surface | Industrial applications |
| Passivated | Improve passive surface condition | Depends on base finish | Corrosion-sensitive applications |
| Polished | Improve smoothness/appearance | Smooth and bright | Special customer requirements |
Physical Properties
|
Property |
Requirement |
|
Tensile Strength |
≥ 515 MPa |
|
Yield Strength, 0.2% |
≥ 205 MPa |
|
Elongation |
≥ 35%* |
|
Hardness |
According to ASTM A312 requirements |
Applications of stainless steel seamless pipes
Stainless steel seamless pipes find several industrial applications, including food processing, petrochemicals, pharmaceuticals, gas, oil, and power plants. These pipes are widely used in different markets as they offer high corrosion resistance, excellent heat transfer, and can effectively withstand high pressures and temperatures. The most commonly used grades of seamless pipes are 316L, 304, and 321.
Benefits of using stainless steel seamless pipes
Stainless steel seamless pipes offer several advantages, making them the preferred choice for many industries. They have superior strength, are highly durable, and resist high-pressure and high-temperature applications. They are also easy to maintain, corrosion-resistant, and can be polished to offer an exceptional finish. Furthermore, they require fewer structures or supports, making them more cost-effective than alternative materials.
Different Grades of Stainless Steel Pipes
UNS S32750, commonly known as Super Duplex 2507, is one of the most widely used super duplex stainless steel grades. It is also associated with EN 1.4410 and is commonly supplied for demanding industrial piping applications.
S32750 typically contains approximately 25% chromium, 7% nickel, 4% molybdenum, and nitrogen. This alloy composition provides excellent resistance to pitting, crevice corrosion, and chloride stress corrosion cracking.
UNS S32760 is another important super duplex stainless steel grade, commonly known by the commercial designation Zeron 100 and associated with EN 1.4501.
Compared with S32750, S32760 contains controlled additions of elements such as copper and tungsten, which contribute to its corrosion-resistant properties in demanding environments.
UNS S32550 Super Duplex Pipe
UNS S32550, commonly known as Ferralium 255, is another super duplex stainless steel grade designed for applications requiring high strength and excellent corrosion resistance.
One of its distinctive characteristics is its relatively high copper content, which can provide advantages in certain corrosive environments.
Chemical Composition and Alloying Elements
Super Duplex stainless steel is a high-alloy duplex stainless steel that combines austenitic and ferritic microstructures. Its excellent performance is mainly achieved through a carefully balanced combination of chromium (Cr), nickel (Ni), molybdenum (Mo), nitrogen (N) and, depending on the grade, copper (Cu) and tungsten (W).
For pipe products, commonly specified grades include UNS S32750 Super Duplex 2507 and UNS S32760 Super Duplex. Their chemical compositions are designed to provide high mechanical strength and excellent resistance to pitting, crevice corrosion, and chloride-containing environments.
UNS S32750 Super Duplex Pipe: UNS S32750, commonly known as Super Duplex 2507, contains approximately 25% chromium, 7% nickel, 4% molybdenum, and controlled nitrogen.
UNS S32760 Super Duplex Pipe: UNS S32760 is another widely used Super Duplex grade. Compared with S32750, S32760 contains controlled additions of copper and tungsten, which are important characteristics of this grade.
Corrosion Resistance:
One of the most important advantages of Super Duplex Pipe is its excellent resistance to aggressive corrosive environments.
Super duplex stainless steel contains relatively high levels of chromium, molybdenum and nitrogen. This alloying system provides strong resistance to localized corrosion, particularly pitting corrosion and crevice corrosion in chloride-containing environments. UNS S32750, for example, is specifically designed for highly corrosive service and is widely used in seawater cooling, desalination, offshore and oil and gas applications.
Strength and Durability:
Another major advantage of Super Duplex Pipe is its very high mechanical strength.
The duplex microstructure combines approximately balanced austenitic and ferritic phases, providing a combination of strength and corrosion resistance that makes super duplex stainless steel attractive for demanding pressure and structural applications.
For example, UNS S32760 is reported with a minimum 0.2% proof stress of 550 MPa and minimum tensile strength of 750 MPa in the referenced material data.
Our Certificate
FAQ
As one of the leading spraying machine manufacturers and suppliers in China, we warmly welcome you to buy high quality spraying machine for sale here from our factory. Good service and reasonable price are available.
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