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Solitaire Overseas is a leading manufacturer, stockist and exporter of ASTM A213 T12 Alloy Steel Tubes and ASME SA 213 Gr T12 Seamless Tubes from Mumbai, India. With over a decade of supply experience in the metallurgical sector, we maintain a ready stock of SA213 T12 seamless tubes in a wide range of sizes, wall thicknesses and schedules to fulfil both urgent and large-volume orders worldwide.
ASTM A213 T12 / SA213 T12 is a 1Cr-½Mo ferritic chromium-molybdenum alloy steel grade standardised under ASME and ASTM specifications for high-temperature pressure service. These seamless tubes are most commonly used in superheaters, reheaters, heat exchangers, boilers and pressure vessels where sustained elevated temperature performance and oxidation resistance are critical.
Request a Free Quote for ASTM A213 T12 TubesThe following specifications apply to our stock of ASTM A213 T12 / ASME SA213 T12 seamless alloy steel tubes:
| Parameter | Details |
|---|---|
| Standard / Specification | ASTM A213 / ASME SA213 |
| Grade | T12 (UNS K11562 / Werkstoff Nr. 1.7335 / 1Cr-½Mo) |
| Tube Type | Seamless |
| Outer Diameter Range | ½" OD up to 5" OD (Custom diameters available); 6–2500 mm |
| Wall Thickness | 1 mm to 200 mm |
| Length | Single Random, Double Random & Cut Length |
| Schedules Available | SCH 20, 30, 40, STD, 60, 80 (XS), 120, 140, 160, XXS |
| Form | Round, Square, Rectangular, Hydraulic |
| Dimensional Standard | ASTM, ASME and API |
| End Condition | Plain End, Bevelled End, Threaded |
| Surface Finish | Bright Annealed, Pickled, Electropolished |
The chromium content (1.00–1.50%) provides excellent oxidation and scaling resistance at temperatures up to 550°C, while the molybdenum (0.44–0.65%) ensures solid-solution strengthening and resistance to softening under sustained thermal loading. Carbon is kept at 0.15% maximum to retain good weldability. To understand how T12 compares within the broader family, see our guide on what is alloy steel and its types.
| Grade | UNS | C (%) | Mn (%) | P (%) | S (%) | Si (%) | Cr (%) | Mo (%) |
|---|---|---|---|---|---|---|---|---|
| T12 | K11562 | 0.15 max | 0.30–0.60 | 0.025 max | 0.025 max | 0.50–1.00 | 1.00–1.50 | 0.44–0.65 |
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| T12 | 415 min | 220 min | 30 min | 163 max |
These mechanical properties make ASTM A213 T12 tubes suitable for sustained high-pressure, high-temperature service. The minimum elongation of 30% reflects good ductility and formability, critical for bending and fabrication into heat exchanger tube assemblies.
The following table lists international equivalent grades for ASTM A213 T12 / ASME SA213 T12 across major standards. This is critical for cross-referencing procurement, inspection, and engineering documents:
| Standard | Grade / Designation |
|---|---|
| ASTM / ASME (USA) | A213 T12 / SA213 T12 |
| UNS (USA) | K11562 |
| DIN / EN (Europe) | 13CrMo4-5 / Werkstoff Nr. 1.7335 |
| BS (UK) | 620-461 |
| JIS (Japan) | STBA22 |
| Trade Name | 1Cr-½Mo |
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
|---|---|---|---|---|
| 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 |
Heat Treatment: SA213 T12 tubes can be heat-treated by full annealing, isothermal annealing, or normalising and tempering. The annealing temperature range is typically 870–900°C followed by controlled cooling.
Welding: Preheating is not required for conventional arc welding processes. However, when oxy-acetylene or submerged arc welding (SAW) is used, the material must be preheated to 150–200°C and post-weld heat treated (PWHT) at 650–720°C to relieve residual stresses and restore toughness.
Operating Temperature: SA213 T12 alloy steel tubes are rated for continuous service up to approximately 550°C (1022°F), making them suitable for high-temperature boiler and pressure vessel applications.
For a broader overview of where Cr-Mo grades are deployed, read our article onchoosing alloy steel pipes for industrial applications.
Solitaire Overseas differentiates itself through verifiable quality infrastructure, not just claims:
ASTM A213 T12 (also designated ASME SA213 Gr T12) is a seamless ferritic chromium-molybdenum alloy steel tube produced under ASTM International Standard A213. The grade belongs to the 1Cr-½Mo family (UNS K11562), containing 1.00–1.50% chromium and 0.44–0.65% molybdenum. It is specifically engineered for high-temperature service in boilers, superheaters, and heat exchangers operating up to approximately 550°C.
The SA213 T12 material composition (per ASTM A213) is: Carbon ≤0.15%, Manganese 0.30–0.60%, Phosphorus ≤0.025%, Sulphur ≤0.025%, Silicon 0.50–1.00%, Chromium 1.00–1.50%, Molybdenum 0.44–0.65%. The UNS designation is K11562 and the European equivalent is Werkstoff Nr. 1.7335 (13CrMo4-5).
The SA213 T12 equivalent grade in European standard is 13CrMo4-5 with Werkstoff Nr. 1.7335 per EN 10216-2. In Japanese JIS standard it corresponds to STBA22, and in British Standard it is designated 620-461. These grades are functionally interchangeable under most engineering specifications but minor composition differences should be verified before substitution.
Both T11 and T12 are low-alloy Cr-Mo grades but differ in chromium and silicon content. T11 (1¼Cr-½Mo) contains 1.00–1.50% Cr and 0.44–0.65% Mo with Si ≤0.50%, whereas T12 (1Cr-½Mo) contains the same Cr and Mo ranges but higher Si (0.50–1.00%). T12 offers slightly better oxidation resistance at comparable temperatures. T11 is more commonly specified for lower-temperature superheater zones; T12 for intermediate-temperature zones.
SA213 T12 tubes are typically supplied in the full-annealed or normalised-and-tempered condition. Annealing is performed in the range of 870–900°C followed by controlled furnace or air cooling. No preheating is required for conventional SMAW/GTAW welding, but oxy-acetylene and submerged arc processes require preheating to 150–200°C and post-weld heat treatment (PWHT) at 650–720°C.
Solitaire Overseas stocks ASTM A213 T12 seamless tubes from ½" OD to 5" OD in standard schedules (SCH 20 through XXS). Custom ODs from 6 mm to 2500 mm OD with wall thickness 1–200 mm are available to order. Lengths are available as single random (4–7 m), double random (7–14 m), or cut-to-length as specified.
SA213 T12 Chrome Moly tubes are widely used in: power generation (boiler superheaters, reheaters), oil refinery and petrochemical fired heaters, catalytic reformer furnaces, offshore oil and gas processing, shell-and-tube heat exchangers, nuclear auxiliary systems, pulp and paper recovery boilers, food processing steam systems, and general high-temperature pressure fabrication.
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