ASTM A369 / ASME SA369
ASTM A369 / ASME SA369 Seamless Steel Tubes
Emirerri Steel provides high-quality ASTM A369 / ASME SA369 seamless steel tubes, engineered for high-pressure and high-temperature applications in boilers, superheaters, and heat exchangers. Our tubes are designed to deliver strength, durability, and excellent thermal performance, making them ideal for industrial, power generation, and chemical applications.
What is ASTM A369 / SA369?
ASTM A369 / ASME SA369 covers seamless carbon and alloy steel tubes used in high-temperature and high-pressure service. These tubes are manufactured using seamless processes, ensuring uniform wall thickness, dimensional accuracy, and mechanical integrity.
The specification includes carbon-steel and alloy-steel grades suitable for a wide range of industrial applications.
Grades Available
Carbon Steel Grade
FPA – A carbon steel grade suitable for general high-temperature service, offering good strength and durability in boiler and superheater tubes.
Alloy Steel Grades
FP1 – Alloy steel with controlled carbon and alloying elements, designed for high-temperature performance.
FP2 – Similar to FP1 with higher alloy content for enhanced creep and oxidation resistance.
FP12 – Alloy steel optimized for medium-to-high temperature boilers and superheaters, with improved strength and corrosion resistance.
FP22 – High-performance alloy steel with enhanced creep strength and thermal stability, suitable for critical high-pressure applications.
ASTM A369 / SA369 Sizes
| Nominal Tube Size (inch) | Outside Diameter (OD) | Wall Thickness (WT) |
|---|---|---|
| 1/2″ | 0.500 / 12.7 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 1″ | 1.000 / 25.4 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 2″ | 2.000 / 50.8 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 4″ | 4.000 / 101.6 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 6″ | 6.000 / 152.4 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 8″ | 8.000 / 203.2 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 10″ | 10.000 / 254.0 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 12″ | 12.000 / 304.8 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 16″ | 16.000 / 406.4 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 20″ | 20.000 / 508.0 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 24″ | 24.000 / 609.6 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 30″ | 30.000 / 762.0 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
| 36″ | 36.000 / 914.4 mm | 0.035 – 4.0 / 0.9 – 101.6 mm |
Key Characteristics
Seamless Construction – Manufactured from solid billets for uniform strength and reliability.
High-Temperature Strength – Maintains mechanical properties in boilers, superheaters, and heat exchangers.
Alloying Elements – Controlled content of molybdenum, chromium, and other elements for enhanced heat resistance and durability.
Corrosion & Oxidation Resistance – Suitable for long-term use in industrial high-temperature environments.
Available in Custom Sizes – Multiple diameters and wall thicknesses available to meet project-specific requirements.
Applications
Power Plants – Boiler tubes, superheater tubes, and high-pressure piping.
Industrial Boilers – Seamless tubes for thermal and mechanical applications.
Chemical & Petrochemical Industry – Heat exchanger tubes exposed to high temperatures and pressure.
Oil & Gas – High-performance alloy steel tubes for critical piping systems.