UNS S31500 Duplex Steel Seamless Pipe Manufacturer and Supplier in Thailand
UNS S31500 Duplex Steel Seamless Pipes is made from high-performance UNS S31500 alloy, which is known for its excellent strength, corrosion resistance, and durability, due to its unique dual-phase austenitic-ferritic structure. Thaida, a reliable supplier based in Chon Buri, Thailand, specializes in manufacturing and supplying premium-grade S31500 duplex seamless pipes. These pipes are widely used in demanding environments such as offshore oil rigs, chemical processing plants, and marine applications due to their superior mechanical and anti-corrosive properties. With advanced production capabilities and deep material expertise, we deliver pipes that comply with international standards. We offer a wide range of specifications and sizes to meet industry-specific needs, ensuring dependable performance and global supply support.
What is UNS S31500 Duplex Steel Seamless Pipes?
UNS S31500 duplex steel seamless pipe is a high-performance piping solution engineered for demanding industrial applications, manufactured in accordance with standards such as ASTM/ASME A789/SA789, A790/SA790, and 3RE60 ASTM A789/A790. This duplex stainless steel has a balanced austenitic and ferritic steel microstructure, combining the best properties of both phases to deliver exceptional strength and superior corrosion resistance, particularly in chloride-rich and aggressive environments. The seamless construction of the pipe ensures leak-proof performance and structural integrity under high pressure, making it ideal for critical systems. Known for its excellent weldability, formability, and high strength-to-weight ratio, UNS S31500 supports efficient fabrication and long service life with reduced maintenance requirements. Its robust performance makes it a preferred material in industries such as oil and gas, marine, petrochemicals, and desalination.
Key Benefits of UNS S31500 Duplex Steel Seamless Pipes
The key benefits of UNS S31500 duplex steel seamless pipes include corrosion resistance, strength, and cost efficiency.
High Strength-to-Weight Ratio
S31500 duplex stainless steel performance is marked by high mechanical strength while remaining lighter than traditional carbon steels. This superior strength-to-weight ratio allows for structural integrity without unnecessary bulk.
Superior Corrosion Resistance
Duplex UNS S31500 pipe has its exceptional corrosion resistance, especially in chloride-rich and harsh chemical environments. This includes excellent pitting and stress corrosion resistance, which significantly enhances durability in aggressive conditions.
Excellent Stress and Crack Resistance
UNS S31500 provides notable resistance to stress corrosion cracking, making it far more reliable than austenitic stainless steels in high-stress, high-temperature applications. This contributes to the UNS S31500 strength and durability in critical systems.
Good Weldability and Fabrication Properties
Another Duplex UNS S31500 pipe advantage is its good weldability and ease of fabrication. This allows for efficient manufacturing, on-site installation, and reduced labor costs without compromising performance.
Cost-Effectiveness
Its long service life, combined with low maintenance requirements, results in lower overall lifecycle costs. These factors make S31500 a financially smart choice for industrial operators seeking long-term reliability.
Dual-Phase Microstructure
The unique dual-phase structure blends austenitic and ferritic steel properties, providing a balance of toughness, hardness, and corrosion resistance. This contributes significantly to the overall S31500 duplex stainless steel performance in varied applications.
Wide Range of Applications
UNS S31500 is widely used across industries such as oil & gas, marine engineering, chemical processing, and desalination. These sectors benefit from both its corrosion resistance and mechanical strength.
Why Choose Thaida for Your UNS S31500 Duplex Steel Seamless Pipes?
Comprehensive Product Testing
Global Exports Expertise
Large Inventory & Fast Dispatch
Custom Sizes & Finishes
In-House Testing & Full Traceability
Advanced Production Technology
After-Sales Support, Service- Technical Support
Industry Certifications & Compliance
Specification of UNS S31500 Duplex Steel Seamless Pipes
The specifications of UNS S31500 duplex seamless pipes cover size range, standards, dimensions, and manufacturing details.
| Specifications | ASTM A790 / ASME SA790 |
|---|---|
| Dimensions | ASTM, ASME and API |
| Seamless 314 Pipes | 1/2" NB - 16" NB |
| Schedule | SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS |
| Specialized in | Large Diameter Size |
| Length | Single Random, Double Random & Cut Length. |
| Form | Round, Square, Rectangular, Hydraulic Etc |
| End | Plain End, Beveled End, Treaded |
Chemical Composition Of ASTM A790 UNS S31500 Seamless Pipes
This chemical composition table of ASTM A790 UNS S31500 pipes outlines the elements like chromium, nickel, and molybdenum.
| Element | Composition (%) |
|---|---|
| Carbon | 0.03 max |
| Manganese | 1.20 - 2.00 |
| Phosphorus | 0.03 max |
| Sulfur | 0.03 max |
| Silicon | 1.40 - 2.00 |
| Nickel | 4.2 - 5.2 |
| Chromium | 18.0 - 19.0 |
| Molybdenum | 2.50 - 3.00 |
| Nitrogen | 0.05 - 0.10 |
Mechanical Properties of UNS S31500 Duplex Steel Seamless Pipes
The Mechanical properties of UNS S31500 Duplex Steel Seamless Pipes include tensile strength, yield strength, and elongation, ensuring performance in industrial use.
| Property | Value | Unit |
|---|---|---|
| Tensile Strength, min | 92 [630] | ksi [MPa] |
| Yield Strength, min | 64 [440] | ksi [MPa] |
| Elongation in 2 in. or 50mm, min | 30 | % |
| Hardness, max (Brinell) | 290 | HBW |
| Hardness, max (Rockwell C) | 30 | HRC |
Physical Properties of UNS S31500 Duplex Steel Seamless Pipes
This section lists key physical characteristics such as density, thermal conductivity, and melting point of UNS S31500.
| Property | Value | Unit |
|---|---|---|
| Density | 7.80 | g/cm³ |
| Thermal Conductivity (at 20°C) | 15 | W/m·K |
| Specific Heat Capacity | 500 | J/kg·K |
| Electrical Resistivity | 0.80 | µΩ·m |
| Modulus of Elasticity | 200 | GPa |
| Coefficient of Thermal Expansion | 13.0 | µm/m·°C |
Manufacturing Process
1. Raw Material Selection
High-quality duplex steel billets and strips are carefully selected for superior strength and corrosion resistance.
2. Pipes Formation
The selected raw material is formed into pipes using seamless extrusion methods, depending on the application.
3. Heat Treatment
Pipes undergo required controlled heat treatment to enhance mechanical properties and relieve internal stresses.
4. Cold Working and Finishing
After heat treatment, pipes are cold-worked for better surface finish, dimensional accuracy and improved strength.
5. Quality Control and Testing
Every pipe is thoroughly inspected and tested to ensure it meets international quality standards for performance and reliability.
Applications of UNS S31500 Duplex Steel Seamless Pipes
Oil and Gas Industry
Marine & Shipbuilding
Chemical and Petrochemical Industry
Power Generation & Heat Exchange
High-Temperature applications
Furnace conveyor systems
Heat Exchangers
Radiant tubes
Pharmaceutical & Biotechnology
FAQ's
How is UNS S31500 Duplex Steel Seamless Pipes different from other Duplex Steels?
UNS S31500 has lower alloying elements than grades like S32205, offering moderate corrosion resistance and good strength. It’s a more economical choice for less demanding environments.
How should UNS S31500 Duplex Steel Seamless Pipes be maintained?
Routine cleaning with mild detergents, avoiding chloride exposure, and periodic inspections help maintain performance. Passivation may be needed in corrosive conditions.
Can UNS S31500 Duplex Steel Seamless Pipes be used in acidic environments?
It performs well in mildly acidic environments but may not withstand highly aggressive acids. For extreme conditions, higher-grade duplex or super duplex steels are recommended.
What makes UNS S31500 a “Duplex” Stainless Steel?
S31500 contains both austenitic and ferritic phases, giving it higher strength and better stress corrosion resistance than standard stainless steels.
What surface finishes are available for S31500 Pipes?
Surface options include mill finish, pickled and passivated, mechanical or electro-polished, and decorative finishes like 2B or No. 4 based on application needs.