Products Description
ASTM A213 T22 alloy steel seamless tubes are a critical component in applications involving elevated temperatures and pressures. This specification covers seamless ferritic and austenitic alloy-steel boiler, superheater, and heat-exchanger tubes.
The T22 grade, a chrome moly alloy, is specifically designed for its excellent strength, resistance to creep, and corrosion resistance at high temperatures. It is often referred to by its ASME equivalent, ASME SA213 T22.
The UNS K21590 T22 designation also identifies this versatile alloy, widely used as T22 boiler tubes and SA213 heater tubes in demanding industrial settings.
Products Specification
| Specification | ASTM A213 Grade T22 / ASME SA213 Grade T22 |
|---|---|
| Common Name | T22 Chrome Moly Tube, 2.25 Chrome Tube |
| UNS Designation | K21590 |
| Manufacturing Process | Seamless |
| Outer Diameter (OD) | 1/2" NB to 24" NB (or as per requirement) |
| Wall Thickness (WT) | SCH 20, SCH 30, SCH STD, SCH 40, SCH 60, SCH XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, SCH XXS (or as per requirement) |
| Length | Single Random, Double Random, Custom Lengths up to 24 meters |
| Ends | Plain End, Bevelled End, Threaded |
Chemical Compositions
| C, % | Mn, % | P, % | S, % | Si, % | Cr, % | Mo, % |
|---|---|---|---|---|---|---|
| 0.05-0.15 | 0.30-0.60 | 0.025 max | 0.025 max | 0.50 max | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties
| Tensile Strength , MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
|---|---|---|---|
| 415 min | 205 min | 30 min | 163 max |
A213 Gr T22 Alloy Steel Seamless Tubes Outside Diameter & Tolerance
| Hot rolled | Outside Diameter, mm | Tolerance, mm |
|---|---|---|
| OD≤101.6 | +0.4/-0.8 | |
| 101.6＜OD≤190.5 | +0.4/-1.2 | |
| 190.5＜OD≤228.6 | +0.4/-1.6 | |
| Cold Drawn | Outside Diameter, mm | Tolerance, mm |
| OD＜25.4 | ±0.10 | |
| 25.4≤OD≤38.1 | ±0.15 | |
| 38.1＜OD＜50.8 | ±0.20 | |
| 50.8≤OD＜63.5 | ±0.25 | |
| 63.5≤OD＜76.2 | ±0.30 | |
| 76.2≤OD≤101.6 | ±0.38 | |
| 101.6＜OD≤190.5 | +0.38/-0.64 | |
| 190.5＜OD≤228.6 | +0.38/-1.14 |
Applications
The robust properties of T22 chrome moly tubes make them indispensable in a wide array of industries:
Power Generation: Boilers, superheaters, reheaters, economizers.
Petrochemical & Refineries: Process piping, furnace tubes, heat exchangers, SA213 heater tubes.
Oil & Gas: High-pressure pipelines, steam injection systems.
Chemical Processing: Handling corrosive media at high temperatures.
Pressure Vessels: Components requiring high strength at elevated temperatures.
Boiler Manufacturing: As critical T22 boiler tubes.
