+91-9619103479
or
vishal@solitaire-overseas.com
Solitaire Overseas manufactures and exports Alloy Steel T11 Tubes — a 1¼% chromium, ½% molybdenum (chrome moly) ferritic alloy steel engineered for sustained high-temperature service per ASTM A213 / ASME SA213. These seamless tubes are widely specified for superheaters, boilers, heat exchangers, and heat recovery steam generators (HRSGs) where operating temperatures reach up to 580 °C and structural integrity under pressure is critical. As a leading SA 213 T11 tube supplier and exporter, we dispatch ASTM A213 T11 alloy steel seamless tubes to power generation, oil & gas, petrochemical and fertilizer industries across 50+ countries with IBR test certificates, NACE compliance, mill test reports (MTRs) and third-party inspection available on request.
Our SA213 T11 material stock covers the full range from ½" OD to 5" OD in seamless form (hot-rolled and cold-drawn), across all schedules from SCH 20 to XXS. Whether you need standard SA 213 Gr T11 boiler tubes or custom cut-to-length alloy steel heat exchanger tubing, contact our team for a competitive A213 T11 price and lead time within 24 hours
Get a Free Quote for T11 Alloy Steel Tubes →ASTM A213 / ASME SA213 is the governing specification for seamless ferritic and austenitic alloy-steel boiler tubes for high-temperature service. Grade T11 classified under UNS K11597 and Werkstoff Nr. 1.7335 belongs to the low-alloy chromium-molybdenum (chrome moly) family. The 1.00–1.50% Cr content provides oxidation resistance and elevated-temperature tensile strength, while the 0.44–0.65% Mo addition improves creep resistance — the material's ability to resist slow plastic deformation under sustained load at high temperatures.
Unlike standard carbon steel boiler tubes, SA213 T11 material retains adequate tensile and yield strength well above 450 °C, making it the industry-standard choice wherever carbon steel has reached its thermal service limits. T11 is specified in ASME Section I power boiler codes, ASME Section VIII pressure vessel codes, and equivalent international standards. It is among the most widely used grades in the broader family of alloy steel tubes due to its combination of cost-effectiveness, weldability, and long-term performance reliability in cyclic thermal environments.
A frequent source of confusion for procurement engineers: T11 (ASTM A213) refers to seamless tubes used as heat transfer surfaces in boilers and heat exchangers. P11 (ASTM A335) refers to seamless pipes used in pressure piping systems. Both share the same 1¼Cr–½Mo chemistry and UNS K11597 designation, but they have different dimensional tolerances, different testing protocols (T11 requires flattening and flaring tests), and are not interchangeable without engineering review. If your application is a superheater tube bundle or HRSG coil, specify T11. If it is a connecting pipe in a high-temperature piping system, specify Alloy Steel P11 Pipe.
| Feature | T11 (ASTM A213) | P11 (ASTM A335) |
|---|---|---|
| Product form | Tube | Pipe |
| Governing spec | ASTM A213 / ASME SA213 | ASTM A335 / ASME SA335 |
| Primary use | Boilers, heat exchangers, superheaters | High-temp pressure piping |
| Chemistry (UNS) | K11597 (1¼Cr–½Mo) | K11597 (1¼Cr–½Mo) |
| Mandatory tests | Flattening + flaring test required | No flattening/flaring required |
| Dimensional tolerance | Tighter OD/WT tolerances | Standard pipe tolerances |
The SA213 T11 material composition is defined in ASTM A213 Table 1 under UNS K11597. The chromium-molybdenum content is the defining characteristic of this T11 material grade, conferring its high-temperature oxidation resistance and creep strength.
| Element | Symbol | Min % | Max % | Role |
|---|---|---|---|---|
| Carbon | C | 0.05 | 0.15 | Base strength; kept low for weldability |
| Manganese | Mn | 0.30 | 0.60 | Deoxidiser; improves hardenability |
| Phosphorus | P | — | 0.025 max | Controlled impurity (embrittlement risk) |
| Sulfur | S | — | 0.025 max | Controlled impurity (hot shortness risk) |
| Silicon | Si | 0.50 | 1.00 | Deoxidiser; improves oxidation resistance |
| Chromium | Cr | 1.00 | 1.50 | Key: oxidation & corrosion resistance |
| Molybdenum | Mo | 0.44 | 0.65 | Key: creep resistance at high temps |
Per ASTM A213 Table 1. UNS K11597 / Werkstoff Nr. 1.7335. The Cr+Mo combination gives T11 its designation as a ‘1¼Cr–½Mo’ or ‘chrome moly’ alloy.
The following SA213 T11 mechanical properties apply in the heat-treated (annealed or normalized and tempered) condition as required by ASTM A213. The low maximum hardness value reflects the ductile, weldable supply condition.
| Mechanical Property | T11 Value | Test Standard |
|---|---|---|
| Tensile Strength | 415 MPa minimum (60,200 psi min) | ASTM A370 |
| Yield Strength (0.2% offset) | 205 MPa minimum (29,700 psi min) | ASTM A370 |
| Elongation in 2" gauge length | 30% minimum | ASTM A370 |
| Brinell Hardness (HB max) | 179 HB maximum | ASTM E10 |
The 179 HB maximum hardness confirms supply in the annealed / normalised-and-tempered condition. Higher hardness indicates insufficient heat treatment or incorrect grade.
ASTM A213 T11 tubes must undergo heat treatment after forming. This is a mandatory specification requirement — not optional. The following methods are permissible under ASTM A213 Table 3:
| Heat Treatment Method | Procedure | Notes |
|---|---|---|
| Full annealing | Heat above lower critical temperature (Ac1), hold, furnace cool | Produces softest condition; maximises ductility |
| Isothermal annealing | Heat above Ac1, hold, cool to below 675°C, hold, air cool | Controlled microstructure; used for tight hardness specs |
| Normalising + tempering | Normalise, then temper at minimum 650°C | Most common commercial condition; good toughness |
Critical point: The minimum tempering temperature for T11 is 650 °C — slightly lower than T9 and T22 tubes (both 675 °C minimum), reflecting T11's lower alloy content. Heat treatment must always be performed separately from and in addition to heating for hot forming. If specific controlled microstructure characteristics are needed for a critical application, state these requirements in the purchase order to guide appropriate heat treatment selection.
For further background on alloy steel heat treatment science, see our blog:Understanding Alloy Steel Material in Industrial Applications.
Solitaire Overseas supplies ASTM A213 T11 alloy steel seamless tubes across the complete size range. All dimensions conform to ASME B36.10M and ASME B36.19M. Custom OD, wall thickness, and length are available on request.
| Specification | Details |
|---|---|
| Standard | ASTM A213 / ASME SA213 (with ASME Section I / Section VIII acceptance) |
| Grade | T11 — UNS K11597 — 1¼Cr–½Mo chrome moly alloy steel |
| Tube Type | Seamless — hot-rolled (hot-finished) or cold-drawn |
| OD Range | ½" (12.7 mm) to 5" (127 mm) OD; custom diameters available |
| Wall Thickness | 1.5 mm to 20 mm standard; custom up to 200 mm WT |
| Length | Single Random (4–7 m), Double Random (7–14 m), Cut to length |
| Form | Round, square, rectangular, hydraulic |
| Schedule | SCH 20, 30, 40, STD, 60, 80, XS, 100, 120, 140, 160, XXS |
| Dimensions Std | ASME B36.10M, ASME B36.19M, ASME B16.10 |
| End Condition | Plain end (PE), bevelled end (BE), threaded |
| Surface Finish | Black mill finish, pickled, bright annealed |
| Int’l Equivalents | EN 10216-2 13CrMo4-5 | DIN 17175 13CrMo44 | GOST 15KhM | BS 3059 Pt II Gr 620 |
The ASTM A213 T11 equivalent designations across global standards are essential for international procurement, approval drawings, and import/export documentation. The chemistry is identical across all the following standards.
| Standard Body | Specification / Code | Grade / Designation |
|---|---|---|
| ASTM (American) | ASTM A213 | T11 |
| ASME (American) | ASME SA213 | T11 |
| EN / European | EN 10216-2 | 13CrMo4-5 |
| DIN / German | DIN 17175 | 13CrMo44 |
| GOST / Russian | GOST 550-75 | 15KhM |
| BS / British | BS 3059 Part II | Grade 620 |
| UNS Number | — | K11597 |
| Werkstoff Nr. | — | 1.7335 |
| Equivalent pipe grade | ASTM A335 / ASME SA335 | P11 |
T11 (tube) and P11 (pipe) are chemically identical (UNS K11597) but are governed by different specifications with different tolerances and tests. They are not interchangeable without engineering approval.
| Outside Diameter (mm) | OD 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 |
| Outside Diameter (mm) | OD 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 |
| OD Condition | WT Condition | Tolerance % |
|---|---|---|
| OD ≤ 101.6 mm | WT ≤ 2.4 mm | +40 / −0 |
| OD ≤ 101.6 mm | 2.4 < WT ≤ 3.8 mm | +35 / −0 |
| OD ≤ 101.6 mm | 3.8 < WT ≤ 4.6 mm | +33 / −0 |
| OD ≤ 101.6 mm | WT > 4.6 mm | +28 / −0 |
| OD > 101.6 mm | 2.4 < WT ≤ 3.8 mm | +35 / −0 |
| OD > 101.6 mm | 3.8 < WT ≤ 4.6 mm | +33 / −0 |
| OD > 101.6 mm | WT > 4.6 mm | +28 / −0 |
| Outside Diameter (mm) | WT Tolerance % |
|---|---|
| OD ≤ 38.1 | +20 / −0 |
| OD > 38.1 | +22 / −0 |
The following indicative weight table covers the most commonly ordered alloy steel T11 tube sizes. Weights are calculated using T11 alloy density of 7.82 g/cm³. For precise weights on non-standard OD or WT, use our weight calculator or contact our technical team.
| NPS | OD (mm) | SCH 40 (kg/m) | SCH 80 (kg/m) | XS (kg/m) | SCH 160 (kg/m) |
|---|---|---|---|---|---|
| ½" | 21.34 | 1.27 | 1.62 | 1.62 | 2.55 |
| ¾" | 26.67 | 1.69 | 2.20 | 2.20 | 3.63 |
| 1" | 33.40 | 2.50 | 3.24 | 3.24 | 4.55 |
| 1¼" | 42.16 | 3.39 | 4.47 | 4.47 | 6.35 |
| 1½" | 48.26 | 4.05 | 5.41 | 5.41 | 7.25 |
| 2" | 60.33 | 5.44 | 7.48 | 7.48 | 11.11 |
| 3" | 88.90 | 11.29 | 15.27 | 15.27 | 22.32 |
| 4" | 114.30 | 16.07 | 21.35 | 21.35 | 30.94 |
| 6" | 168.28 | 28.26 | 35.11 | 35.11 | — |
All weights are indicative. Actual weights depend on mill tolerances. Contact us for certified weight calculations on large orders.
See also: schedule 40 steel pipe reference | schedule 80 steel pipe reference.
Every SA213 T11 tube supplied by Solitaire Overseas undergoes a rigorous multi-stage quality assurance protocol before dispatch. Testing is conducted under qualified third-party supervision where specified, and full mill test reports (MTRs) with heat and lot traceability are provided as standard with every shipment. We are ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, and PED 2014/68/EU certified. See our quality policy and certificates page for details.
| Test / Inspection | Standard / Method | Availability |
|---|---|---|
|
Tensile and yield strength test |
ASTM A370 |
Standard (every heat) |
|
Brinell hardness test (179 HB max) |
ASTM E10 |
Standard |
|
Flattening test |
ASTM A213 §11 |
Standard |
|
Flaring test |
ASTM A213 §11 |
Standard |
|
Hydrostatic test or UT (non-destructive) |
ASTM A213 / ASME |
Standard (one per lot) |
|
Positive material identification (PMI) |
XRF analysis |
On request |
|
Intergranular corrosion test |
ASTM A262 |
On request |
|
NACE HIC test |
NACE TM0284 |
On request |
|
NACE SSC test |
NACE TM0177 |
On request |
|
IBR test certificate |
Indian Boiler Regulations |
On request |
|
Third-party inspection |
BV, SGS, Lloyds, TÜV |
On request |
SA213 T11 alloy steel seamless tubes are bundled in hexagonal or square bundles with steel strapping, plastic end caps, and waterproof polyethylene wrap. Each bundle carries a stencilled heat/lot number, grade, size, specification, and country of origin for full traceability. Export-grade wooden crating is available for ocean freight. For guidance on reading documentation, see: How to Read a Mill Test Report (MTR) for Heat Exchanger Tubes.
SA213 T11 alloy steel seamless tubes are bundled in hexagonal or square bundles with steel strapping, plastic end caps, and waterproof polyethylene wrap. Each bundle carries a stencilled heat/lot number, grade, size, specification, and country of origin for full traceability. Export-grade wooden crating is available for ocean freight.
The chromium-molybdenum composition and seamless construction of A213 T11 alloy steel seamless tubes make them the preferred choice for critical high-temperature, high-pressure service. The seamless structure eliminates weld seam discontinuities, resulting in a more homogeneous microstructure with superior creep strength, burst resistance, and cyclic thermal fatigue resistance compared to welded alternatives. Below are the primary application industries, with specific use cases.
If SA213 T11 does not exactly match your project's temperature, pressure, or oxidation resistance requirements, the following grades in the ASTM A213 chrome moly family may be more appropriate. All are available from Solitaire Overseas.
| Grade | Cr % | Mo % | Max Temp | Best Application | Our Page |
|---|---|---|---|---|---|
|
T5 |
4–6 |
0.45–0.65 |
620 °C |
Higher-temp refinery heater tubes |
alloy-steel-t5-tubes-supplier-exporter.html |
|
T9 |
8–10 |
0.90–1.10 |
650 °C |
Heavy superheater / high Cr duty |
alloy-steel-t9-tubes-supplier-exporter.html |
|
T11 ★ |
1.0–1.5 |
0.44–0.65 |
580 °C |
Standard boiler / HRSG service |
alloy-steel-t11-tubes-supplier-exporter.html |
|
T12 |
0.8–1.25 |
0.44–0.65 |
565 °C |
Lower Cr variant; economisers |
alloy-steel-t12-tubes-supplier-stockist.html |
|
T22 |
1.9–2.6 |
0.87–1.13 |
620 °C |
Higher-pressure boiler service |
alloy-steel-t22-tubes-supplier-exporter.html |
|
T91 |
8–9.5 |
0.85–1.05 |
650 °C |
Ultra-supercritical boilers |
alloy-steel-t91-tubes-supplier-exporter.html |
|
T92 |
8.5–9.5 |
0.30–0.60 |
650 °C+ |
Advanced USC power generation |
alloy-steel-t92-tubes-supplier-stockist.html |
For the parent category, see our full Alloy Steel Tubes range. For pipes in the same chrome moly family, see Alloy Steel Pipes.
We supply the following forms and configurations of T11 alloy steel tubing:
SA 213 T11 is a seamless ferritic alloy steel tube grade specified under ASME SA213 (the ASME equivalent of ASTM A213). The SA213 T11 material contains 1.00–1.50% chromium and 0.44–0.65% molybdenum (UNS K11597), giving it excellent creep resistance and oxidation resistance at elevated temperatures up to approximately 580°C. It is primarily used as a boiler tube, superheater tube, and heat exchanger tube in power generation and petrochemical plants.
The main international equivalents for ASTM A213 T11 are: EN 10216-2 grade 13CrMo4-5 (Europe), DIN 17175 grade 13CrMo44 (Germany), BS 3059 Part II grade 620 (UK), GOST 15KhM (Russia). The equivalent pipe grade is ASTM A335 P11. The UNS number is K11597 and Werkstoff number is 1.7335. See the full SA213 T11 material equivalent table above.
T11 material grade is the ASTM/ASME designation for a 1¼ chromium, ½ molybdenum (1¼Cr–½Mo) low-alloy ferritic steel used in tube form. The ‘T’ prefix denotes a tube product under ASTM A213, as distinct from ‘P’ for pipes (ASTM A335). It is one of the most widely used chrome moly grades globally for high-temperature pressure service due to its balance of cost, weldability, fabricability, and long-term thermal stability.
T11 boiler tube is a seamless alloy steel tube manufactured to ASTM A213 / ASME SA213 Grade T11, intended for use as a pressure boundary heat-transfer component in steam boilers, superheaters, and reheaters. IBR (Indian Boiler Regulations) certification is available for equipment registered under Indian boiler inspection jurisdiction.
The maximum permitted SA 213 T11 hardness is 179 HB (Brinell Hardness). This maximum value reflects supply in the annealed or normalised-and-tempered condition, which also optimises toughness, ductility, and weldability for boiler fabrication. If tested hardness exceeds 179 HB, the tubes have not been adequately heat treated and should be rejected.
ASTM A213 covers tube sizes from ⅛" internal diameter up to 5" outside diameter in the standard size range, with wall thicknesses from 0.015" (0.4 mm) to 0.500" (12.7 mm). Solitaire Overseas stocks T11 tubes from ½" OD (12.7 mm) through 5" OD in standard and custom wall thicknesses, in single random, double random, and cut lengths.
Both T11 (ASTM A213) and P11 (ASTM A335) share the same 1¼Cr–½Mo chemistry and UNS K11597 designation but are governed by different specifications for different functions. T11 is a heat transfer tube with tight OD/WT tolerances and mandatory flattening and flaring tests. P11 is a pressure piping product with different tolerances and no flattening/flaring requirement. They are not interchangeable without formal engineering review.
SA213 T11 tubes are compatible with fusion welding (GTAW/TIG, SMAW, FCAW, SAW) using matching 1¼Cr–½Mo filler metals per AWS A5.5 (SMAW), A5.23 (SAW), or A5.28 (GMAW/GTAW). Preheat of 150–250°C is typically required for wall thicknesses above 13 mm to prevent hydrogen-induced cracking. Post-weld heat treatment (PWHT) at 650–700°C is generally mandatory to restore toughness in the heat-affected zone and to meet ASME/IBR code requirements.
SA213 T11 tube price depends on OD, wall thickness, schedule, length, quantity, mill origin, and testing requirements. Indicative A213 T11 price starts from approximately USD 1,800–2,400/ton for standard Indian-origin seamless tubes in common schedules (SCH 40/80), ex-Mumbai. Prices vary with global ferrochrome, molybdenum, and steel billet market conditions. Contact us for a firm quotation — we respond within 24 hours and maintain stock for immediate dispatch.
a213 t11 price | astm a213 t11 wholesaler | sa 213 gr t11 specification | sa 213 t11 supplier | sa213 t11 exporter | alloy steel t11 tubes stockist | alloy steel astm a213 t11 seamless tubes | sa 213 grade t11 | sa213 t11 material | sa213 t11 material composition | sa213 t11 material equivalent | t11 material | t11 material composition | alloy steel astm a213 t11 tubes
Grade | Standard | OD | Wall Thickness | Quantity | Delivery Country
Respond within 24 hours | 500+ clients worldwide | Full mill certification supplied