Seamless Stainless Steel TP309 Pipe (UNS S30900 / 1.4828) – High-Temperature Oxidation-Resistant Alloy
1. Overview of Seamless TP309 Pipe
Seamless stainless steel TP309 pipe (UNS S30900 / W.Nr. 1.4828) is a high-performance heat-resistant austenitic stainless steel designed for demanding high-temperature applications requiring excellent oxidation resistance and mechanical stability.
Manufactured via a seamless process from solid billets, including hot piercing and cold finishing, TP309 pipes offer a uniform metallurgical structure, consistent wall thickness, and superior pressure resistance, ensuring reliability under extreme thermal cycling and mechanical stress.
The alloy contains a high proportion of chromium (22–24%) and nickel (12–15%), forming a stable, protective oxide layer that significantly reduces scaling and metal loss at elevated temperatures.
2. Key Technical Advantages
- Excellent High-Temperature Oxidation Resistance
Designed for continuous service up to 1038°C (1900°F) and intermittent service up to 1010°C (1850°F), providing outstanding resistance to oxidation and carburization. - Superior Thermal Stability
Maintains structural integrity under thermal cycling conditions, making it ideal for furnace and heat-treatment applications. - Good Corrosion Resistance
Offers improved resistance compared to TP304, particularly in sulfur-bearing and mildly corrosive environments. - High Pressure Integrity
Seamless construction eliminates weld-related defects, conforming to ASTM A312 / ASME SA312 for high-pressure piping systems. - Creep Resistance & Durability
Retains mechanical strength at elevated temperatures, ensuring extended service life in high-stress environments. - Non-Magnetic Austenitic Structure
Remains non-magnetic in annealed condition, suitable for specialized industrial and electrical applications.
Product Specifications and Data
To provide a comprehensive overview of this material, here are the detailed technical specifications and performance data for 309 stainless steel.
The composition of Stainless Steel 309 is carefully balanced to achieve its superior high-temperature oxidation resistance and strength.
Stainless Steel 309 is specifically designed to maintain its strength and shape in high-stress, high-temperature environments.
These physical properties highlight the material’s ability to perform reliably under a wide range of conditions.
Industrial Applications
Seamless TP309 pipes are widely used in high-temperature and heat-processing industries:
Furnace & Thermal Processing
Furnace linings, radiant tubes, heat shields, muffle tubes
Power Generation
Boiler components, hangers, and thermal oxidizers in coal-fired and biomass plants
Petrochemical Industry
Catalytic systems, hot gas handling, and acid processing equipment
Cement & Kiln Industry
Rotary kilns, kiln linings, cooling systems
Automotive & Exhaust Systems
High-temperature exhaust manifolds and thermal reactors
Quality Assurance & Certification
We ensure full compliance with international standards through strict quality control:
- Material Certification
EN 10204 3.1 / 3.2 Mill Test Certificate (MTC)
Full heat traceability from raw material to finished product - Non-Destructive Testing (NDT)
- Ultrasonic Testing (UT)
- Eddy Current Testing (ET)
- Hydrostatic Testing (HT)
- Positive Material Identification (PMI)
- Mechanical & Metallurgical Testing
- Grain size analysis (ASTM E112)
- Intergranular Corrosion (IGC) testing
- Flattening and flaring tests
- Third-Party Inspection Available
ABS, DNV, BV, TÜV, SGS, Lloyd’s Register
