SA213 T2 Seamless Alloy Steel Tube – ASTM A213 / ASME SA213 Standard for Boiler, Superheater and Heat Exchanger – Low-Chromium Ferritic Alloy Tube for Moderate High-Temperature Service

Premium SA213 T2 Seamless Alloy Tube for Boilers, Superheaters, Heat Exchangers, and Moderate High-Temperature Industrial Piping

Womic Steel produces high-quality SA213 T2 Seamless Alloy Steel Tube, manufacturing chromium-molybdenum (0.5Cr-0.5Mo) ferritic alloy tubes in accordance with ASTM A213 / ASME SA213 specifications. Our SA213 T2 tubes meet the requirements of the American Society of Mechanical Engineers (ASME) Boiler and Pressure Vessel Code, with a minimum tensile strength of 415 MPa and good creep resistance at elevated temperatures up to 510°C (950°F). These seamless alloy tubes are the ideal choice for lower-temperature superheater sections, economizers, boiler water walls, heat exchangers, and moderate high-temperature industrial piping where cost-effective creep-resistant material is required.

Manufacturer: Womic Steel

1. Product Definition and Scope

SA213 T2 (UNS K11522) is a seamless ferritic alloy steel tube specified under ASTM A213 / ASME SA213 for use in boilers, superheaters, heat exchangers, and other pressure-containing equipment operating at moderate elevated temperatures. The “T2″ designation indicates a nominal composition of 0.5% chromium and 0.5% molybdenum. T2 is the lowest chromium-molybdenum alloy grade in the SA213 family, offering improved creep strength over carbon steel at a moderate cost, making it suitable for less severe high-temperature service.

Manufacturing Process: T2 tubes are manufactured by the seamless process (hot-finished or cold-finished). They are typically supplied in the annealed or normalized and tempered condition. T2 has lower hardenability than higher chromium grades, making it easier to weld while still providing useful creep resistance.

Grade Designation:

Equivalent Standards and Grades:

Manufacturer: Womic Steel

2. Chemical Composition Requirements

The chemical composition of SA213 T2 is relatively simple compared to higher alloy grades. It contains modest chromium and molybdenum additions to enhance creep strength while maintaining good weldability and formability.

SA213 T2 Chemical Composition (Heat Analysis – Seamless Tube):

Composition Notes:

T2 is sometimes described as a carbon steel with molybdenum addition. The 0.5% Mo provides significant creep strength improvement over plain carbon steel (SA210 grade A1 or C), while the low chromium content adds minimal cost. It is a logical upgrade when carbon steel reaches its temperature limit (around 400-425°C).

3. Mechanical Properties

The mechanical properties of SA213 T2 are similar to carbon steel at room temperature but maintain strength better at elevated temperatures.

Tensile Requirements (Room Temperature):

For thin walls, elongation adjustment follows the same formula as other SA213 grades.

Hardness Requirements:

High-Temperature Tensile Properties (Reference Values):

Creep Rupture Strength (Typical Values):

T2 provides a useful increase in allowable stress over carbon steel at temperatures between 400°C and 510°C. Above 510°C, its creep strength drops rapidly, and higher alloy grades (T11, T22) are recommended.

4. Heat Treatment Requirements

T2 tubes are normally supplied in the annealed or normalized and tempered condition. The required heat treatment depends on the forming method and final properties.

Heat Treatment Requirements:

Manufacturer: Womic Steel performs heat treatment in accordance with ASTM A213 / ASME SA213 requirements. Heat treatment certificates are available upon request.

5. Dimensional Tolerances

Dimensional tolerances for T2 tubes follow ASTM A213 / A1016 and are identical to those described for T11 and T22.

● Cold Drawn OD Tolerances: ±0.10 mm for OD < 25.4 mm, graduated up to ±0.38 mm for OD 76.2-101.6 mm.

● Wall Thickness Tolerances (Cold Drawn): ±10% of nominal thickness.

● Hot Finished Tolerances: Follow the same +40%/-0 to +28%/-0 rules depending on OD and WT.

● Straightness: 0.2% of length (2 mm/m).

● Length Tolerances: Random 5-12 m; specific lengths +50-100 mm / -0.

6. Available Sizes and Specifications

T2 tubes are available in the same size ranges as other SA213 grades.

Typical Size Range:

● Cold Finished: OD 6.35 mm (1/4″) to 101.6 mm (4″)

● Hot Finished: OD 12.7 mm (1/2″) to 219.1 mm (8-5/8″)

● Wall Thickness: 0.5 mm to 15 mm depending on size

Common T2 Tube Sizes (OD x WT in mm):

25.4 x 2.5, 31.8 x 3.0, 38.1 x 3.5, 44.5 x 4.0, 50.8 x 4.0, 50.8 x 5.0, 60.3 x 5.0, 63.5 x 5.0, 76.2 x 6.0, 88.9 x 6.0, 101.6 x 8.0

Manufacturer: Womic Steel maintains stock of common T2 tube sizes for boiler and heat exchanger applications.

7. Inspection and Testing Requirements

Standard SA213 tests apply to T2:

NDT Methods: Eddy current (ECT) or ultrasonic (UT) as specified. Hydrostatic testing is also accepted.

Hydrostatic Test Pressure: Calculated per P = 2St/D, with S based on material strength, hold time 5 seconds minimum.

8. Applications

SA213 T2 tubes are used in moderate elevated temperature service where carbon steel is inadequate but high-alloy CrMo is over-specified.

T2 offers a cost-effective alternative to carbon steel when operating temperatures exceed 400-425°C but do not require the full creep strength of T11. It is often used in economizers and lower-temperature superheater sections of industrial boilers.

9. Comparison with Carbon Steel and T11

T2 fills the gap between carbon steel and T11. While not as strong as T11 at high temperatures, it is less expensive and easier to weld, making it a practical choice for moderate service conditions.

10. Welding Procedure for SA213 T2

T2 has low hardenability and is readily weldable with standard procedures, but preheat and PWHT are still required for thicker sections or code compliance.

Recommended Welding Processes: SMAW, GTAW, GMAW.

Recommended Filler Metals:

Critical Welding Requirements:

For most tube applications, PWHT may be waived if the wall thickness is below code exemption limits, but many specifications still require it to restore mechanical properties and relieve residual stress.

11. Traceability and Marking

Each tube is stencil marked with:

● Manufacturer name (Womic Steel)

● Specification (ASTM A213/ASME SA213 T2)

● UNS K11522

● Size (OD x WT)

● Heat number

● Length

● NDT method

Marking Example:

12. Quality Documents

● Mill Test Report (EN 10204 Type 3.1) – included

● Heat Treatment Certificate – included

● Hydrostatic/NDT Certificate – included

● Dimensional Inspection Report – included

● Certificate of Origin – included

● Third-Party Inspection – optional

13. Contact Information

Website: www.womicsteel.com

E-mail: sales@womicsteel.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel – Your reliable partner for SA213 T2 seamless alloy tubes, stainless steel products, and custom solutions for boiler, superheater, heat exchanger, and industrial heat transfer applications.