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Solitaire Overseas is a leading supplier and exporter of IBR Approved ASTM A213 T22 Alloy Steel Seamless Tubes from Mumbai, India. Also designated as ASME SA213 T22, this chrome moly (2.25Cr–1Mo) tube is the standard of choice for high-temperature boiler, superheater and heat exchanger service where temperatures reach up to 590°C (1094°F). We maintain ready stock of SA213 T22 seamless tubes in a full range of sizes, schedules and lengths supplied with EN 10204 3.1 Mill Test Certificates and IBR documentation.
ASTM A213 T22 is the ASTM International specification for seamless ferritic alloy-steel tubes designed for boiler, superheater and heat exchanger service. The ASME equivalent is SA213 T22. The grade designation "T22" identifies a specific ferritic chrome moly steel containing approximately 2.25% chromium and 1% molybdenum which is why it is also called 2.25Cr-1Mo steel.
The chromium content provides oxidation resistance and creep strength at elevated temperatures. The molybdenum content raises elastic limit, high-temperature tensile strength, and hardness while improving resistance to hydrogen attack, a critical requirement in refinery and petrochemical environments. Together these alloying elements make T22 one of the most widely specified materials for supercritical boiler tubes, superheater coils, and heat exchanger bundles worldwide.
Historically, SA 199 T22 and SA 200 T22 were separate specifications for these compositions. Both were withdrawn and consolidated into the current SA 213 / ASTM A213 standard.
The SA213 T22 material composition is defined by the ASTM A213 / ASME SA213 specification. The precise balance of chromium and molybdenum is what gives T22 steel its high-temperature performance.
| Element | Symbol | Composition % | Role in T22 Steel |
|---|---|---|---|
| Carbon | C | 0.05 – 0.15 max | Controls hardness and hardenability |
| Manganese | Mn | 0.30 – 0.60 | Deoxidation, improves toughness |
| Phosphorus | P | 0.025 max | Controlled impurity |
| Sulphur | S | 0.025 max | Controlled impurity |
| Silicon | Si | 0.50 max | Deoxidation, oxidation resistance |
| Chromium | Cr | 1.90 – 2.60 | Oxidation & corrosion resistance at high temp |
| Molybdenum | Mo | 0.87 – 1.13 | Creep strength, resistance to hydrogen attack |
| Property | Value | Unit |
|---|---|---|
| Tensile Strength (min) | 415 | MPa |
| Yield Strength (min) | 205 | MPa |
| Elongation (min) | 30 | % |
| Hardness (max) | 163 | HB (Brinell) |
| Physical Property | Value |
|---|---|
| Density | 0.282 lb/in³ (7.82 g/cm³) |
| Melting Point | 1382°C (2520°F) |
| Maximum Service Temperature | 590°C (1094°F) continuous |
| Thermal Conductivity | ≈36 W/m·K at room temperature |
| Coefficient of Thermal Expansion | ≈12.3 × 10³/°C |
| Parameter | Details |
|---|---|
| Specification | ASTM A213 / ASME SA213 T22 |
| UNS Number | K21590 |
| European Steel Number (WNR) | 1.7380 |
| Size Range (OD) | ½" OD up to 5" OD; custom diameters available |
| Wall Thickness | SCH 20 to SCH XXS; up to 12 mm (custom on request) |
| Type | Seamless, ERW, Welded, Cold Drawn Welded (CDW) |
| Form | Round, Square, Rectangular, Coiled, U-Shape, Hydraulic |
| Length | Single Random, Double Random, Cut-to-Length (up to 25 m cold-drawn) |
| End Finish | Plain End, Bevelled End, Threaded |
| Surface Finish | Pickled, Polished, Bright Annealed, Varnished |
| Delivery Condition | Hot Rolled / Cold Drawn, Annealed & Tempered |
| Inspection & Certs | EN 10204 3.1/3.2, IBR, PMI, NABL, Third Party (SGS, TUV, DNV, LR) |
| Packing | Wooden boxes, plastic bags, steel-strip bundles; export packing available |
| Outside Diameter | OD Tolerance | Wall Thickness Tolerance | Ovality | Cut Length |
|---|---|---|---|---|
| OD ≤ 12.7 mm | ±0.13 mm | ±15% | — | +3.18 mm / −0 mm |
| 12.7 < OD ≤ 38.1 mm | ±0.13 mm | ±10% | max 1.65 mm | +3.18 mm / −0 mm |
| 38.1 < OD ≤ 88.9 mm | ±0.25 mm | ±10% | max 2.41 mm | +4.76 mm / −0 mm |
Engineers frequently compare T22 with adjacent grades when specifying tubes for high-temperature service. The table below summarises key differences:
| Grade | Spec | Cr% | Mo% | Tensile (min MPa) | Max Temp (°C) | Key Application |
|---|---|---|---|---|---|---|
| T11 | ASTM A213 | 1.00–1.50 | 0.44–0.65 | 415 | 540 | Lower temp boiler tubes |
| T22 (this grade) | ASTM A213 | 1.90–2.60 | 0.87–1.13 | 415 | 590 | Superheaters, refinery furnace tubes |
| T91 | ASTM A213 | 8.0–9.5 | 0.85–1.05 | 585 | 650+ | High-pressure supercritical boilers |
| P22 | ASTM A335 | 1.90–2.60 | 0.87–1.13 | 415 | 590 | Same alloy — pipe form (P22) |
T22 (tube) and P22 (pipe) share identical chemical compositions but follow different ASTM specifications. T22 is covered under ASTM A213 (tubes); P22 is covered under ASTM A335 (pipes).
For a deeper technical read, our blog covers alloy steel vs stainless steel and the ultimate guide to choosing alloy steel pipes for industrial applications.
T22 tubes are supplied in the full annealed or normalised-and-tempered condition as per ASTM A213 requirements. This heat treatment refines the ferritic microstructure and achieves the specified mechanical properties.
Post-Weld Heat Treatment (PWHT): T22 steel requires PWHT after welding to relieve residual stresses and prevent hydrogen-induced cracking. Typical PWHT temperature range is 690–760°C (1275–1400°F). PWHT is mandatory per most applicable codes (ASME, EN 13480) when used in pressure service.
Weldability: T22 has moderate weldability. Preheat of 150–200°C is recommended for wall thicknesses above 12 mm. Matching filler metal (E90S-B3 / ER90S-B3) should be used to maintain the 2.25Cr-1Mo alloy composition in the weld zone.
| Type | Description | Common Use |
|---|---|---|
| T22 Boiler / Superheater Tubes | IBR approved; hot-rolled and cold-drawn; available up to 25 m | Main steam circuits, reheater circuits |
| T22 Heat Exchanger Tubes | Close OD/WT tolerance; available with eddy current test | Shell-and-tube heat exchangers, condensers |
| T22 Furnace / Heater Tubes | Heavy wall, high-OD; high-temperature radiant section service | Refinery fired heaters, cracking furnaces |
| T22 Coil / U-Bend Tubes | Pre-bent to specification; minimum bending radius to ASME standards | Superheater coils, evaporator coils |
| T22 Square & Rectangular Tubes | Custom section geometry; structural and process use | Structural high-temp frames, custom fabrications |
| IBR Certified SA213 T22 Tubing | Certified to India Boiler Regulation; with IBR Form III-A | Indian power plants and IBR-governed applications |
Indicative price ranges for ASTM A213 T22 seamless tubes (USD FOB Mumbai). Prices vary based on OD, wall thickness, quantity, and prevailing raw material rates.
| Size (NPS) | Approx. Price (USD/mtr) | Notes |
|---|---|---|
| 1/2" (12.7 mm OD) | $18–30/mtr | Thin wall (SCH 40/80) |
| 3/4" (19.05 mm OD) | $22–38/mtr | Thin wall (SCH 40/80) |
| 1" (25.4 mm OD) | $28–50/mtr | SCH 40 to SCH 160 |
| 2" (50.8 mm OD) | $55–95/mtr | SCH 40 to XS |
| 3" (76.2 mm OD × 12 mm WT) | $28–35/mtr | Indicative rate |
| Custom / Large OD | On Request | Contact us with exact spec |
| Get T22 Tube Price Per Kg Contact us with your OD × WT × Length × Quantity for a firm price quote. We respond within 60 minutes on business days. +91-9619103479 | vishal@solitaire-overseas.com | ||
We supply the full range of ASTM A213 ferritic alloy steel tube grades for boiler, superheater, and heat exchanger service:
SA213 T22 has a chemical composition of: Carbon 0.05–0.15%, Manganese 0.30–0.60%, Phosphorus 0.025% max, Sulphur 0.025% max, Silicon 0.50% max, Chromium 1.90–2.60%, and Molybdenum 0.87–1.13%. It is known as a 2.25Cr-1Mo steel with UNS number K21590.
There is no technical difference — they describe the same material. ASTM A213 is the specification published by ASTM International; SA213 is the identical specification adopted by ASME (American Society of Mechanical Engineers) into its Boiler and Pressure Vessel Code. Manufacturers supply tubes to either designation; both are accepted interchangeably in most projects.
ASTM A213 T22 tubes are rated for continuous service up to approximately 590°C (1094°F). Above this temperature, the lower-alloy T22 loses sufficient creep strength and grades such as T91 (9Cr-1Mo-V) are specified instead.
T22 and P22 share identical chemical compositions (2.25Cr-1Mo, UNS K21590). The difference is purely dimensional and form-based: T22 is covered under ASTM A213 (seamless tubes for boilers and heat exchangers), while P22 is covered under ASTM A335 (seamless pipes for high-temperature service). Tube dimensions are generally smaller in OD and held to tighter tolerances than pipes.
Yes. Post-Weld Heat Treatment (PWHT) is mandatory for T22 in most pressure-service codes. The standard PWHT temperature range is 690–760°C (1275–1400°F). Pre-heat of 150–200°C prior to welding is also required for wall thicknesses above approximately 12 mm.
Yes, SA213 T22 tubes can be supplied with IBR (India Boiler Regulation) certification. Solitaire Overseas supplies IBR Form III-A certified T22 tubes for use in Indian power plants and industrial boiler applications covered by the Indian Boilers Act.
The maximum permissible hardness for ASTM A213 T22 tubes per specification is 163 HB (Brinell). In practice, supplied material typically measures between 120–155 HB depending on the specific heat treatment applied.
T22 is a lower-alloy chrome moly steel (2.25Cr-1Mo) with a tensile strength of 415 MPa minimum and a service limit around 590°C. T91 is a more highly alloyed grade (9Cr-1Mo-V) with a tensile strength of 585 MPa minimum, capable of service above 650°C in supercritical and ultra-supercritical boiler applications. T91 costs significantly more than T22; T22 remains the most economical choice for the 540–590°C operating range.
UNS K21590 is the Unified Numbering System designation for the 2.25Cr-1Mo alloy steel composition used in ASTM A213 T22 (tubes) and ASTM A335 P22 (pipes). The equivalent European steel number is 1.7380.
Prices depend on OD, wall thickness, quantity, and current market rates for chrome moly alloy steel. As a general indication, T22 seamless tubes range from approximately USD 1,800–3,500 per metric tonne (INR 150,000–290,000 per MT) for standard sizes. Contact Solitaire Overseas for a firm quotation based on your exact specification.
Grade | Standard | OD | Wall Thickness | Quantity | Delivery Country
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