Products Description
ASTM A213 T9 Alloy Steel Seamless Tubes are specialized chromium-molybdenum (often referred to as Chrome-Moly T9 Tube) ferritic alloy steel tubes. Identified by the UNS designation K90941, these tubes are specifically designed for critical high-temperature service.
Their composition, primarily featuring 9% chromium and 1% molybdenum, provides excellent resistance to heat, oxidation, and corrosion at elevated temperatures, making them indispensable for applications such as boilers, superheaters, and heat exchangers.
The ASTM A213 specification is the industry standard governing seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes. Grade T9 within this standard signifies a specific ferritic alloy composition.
These tubes are also frequently specified under the equivalent ASME standard, ASME SA 213 T9. The "seamless" nature of these tubes, achieved through processes like hot rolling or cold drawing, ensures a homogenous structure without weld seams, offering superior strength and integrity under high-pressure conditions.
Products Specification
| Specification | Details |
|---|---|
| Standards | Primarily ASTM A213, ASME SA213 |
| Equivalent Standards | EN 10216-2 (e.g., 10CrMo9-10), ASTM A335 (for pipe), GOST 550-75, DIN 17175, WN 1.7386 |
| Material Designation | T9 (as per ASTM A213), S50400 (UNS Number) |
| Equivalent Material | P9 (as per ASTM A335) |
| Type | Seamless (hot-finished or cold-drawn) |
| Outer Diameter (OD) | 6.35mm (1/4") to 101.60mm (4"). Large sizes up to 2500mm on request |
| Wall Thickness (WT) | Standard: 3mm to 15mm. Heavier up to 200mm on request |
| Schedule | STD, SCH40, SCH80, and others available |
| Length | Up to 12 meters. Single Random, Double Random & Custom Cut |
| Form | Primarily Round. Square, Rectangular, Hydraulic, and U-Tube available on request |
| Tubing End | Plain End (PE), Beveled End (BE), Threaded (NPT or custom) |
Chemical Composition (wt %) of ASTM A213 T9 Alloy Steel Seamless Tubes
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % |
|---|---|---|---|---|---|---|
| 0.15 max | 0.30-0.60 | 0.025 max | 0.025 max | 0.25-1.00 | 8.0-10.0 | 0.90-1.10 |
Mechanical Properties of ASTM A213 T9 Tubes
| Property | Value (Minimum, unless stated) |
| Tensile Strength | 60,000 psi (415 MPa) |
| Yield Strength | 30,000 psi (205 MPa) |
| Elongation (in 2in/50mm) | 30% |
| Hardness | Rockwell B: 85 max / Brinell: 179 max |
Products Applications
ASTM A213 T9 Alloy Steel Seamless Tubes are indispensable in high-temperature, high-pressure environments across various critical sectors. These versatile tubes find primary application as:
Boiler tubes for efficient industrial and power generation steam systems.
Superheater tubes essential for raising steam temperatures to improve thermal efficiency in power plants.
Heat exchanger tubes widely employed for effective thermal energy transfer.
They form essential components in specific equipment such as economizers, high-pressure steam piping and headers, furnace components and radiant tubes, petroleum refining heaters and cracking units, and reheaters in power cycles.
Consequently, ASTM A213 T9 tubes are widely adopted across key industries including Power Generation (Fossil Fuel, Combined Cycle Plants), Petrochemical and Chemical Processing, Oil & Gas Refineries, Fertilizer Production, and Waste Heat Recovery Systems.
