ASME SA213, ASTM A213 / A 213M T11, T12, T22, T2, T5, T5b, T5c, T9, T91 is the standard applicable to seamless alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
ASME SA213 /SA213M tubes shall be made by the seamless process and shall be either hot-finished or cold finished as specified.
ASME SA213 /SA213M covers several grades of minimum- wall-thickness, seamless, alloy-steel, boiler and superheater tubes.
ASME SA213 /SA213M tubing sizes and thicknesses usually furnished to this specification are 1⁄8 in. [3.2 mm] in inside diameter to 5 in. [127 mm] in outside diameter and 0.015 to 0.500 in. [0.4 to 12.7 mm], inclusive, in minimum wall thickness or, if specified in the order, average wall thickness.
Chemical Composition:
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Chemical Components (%) |
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| Grade | C | Mn | P | S | Si | Cr | Mo |
| T11 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.035 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| T12 | 0.05-0.15 | 0.30-0.61 | ≤0.025 | ≤0.035 | 0.5 | 0.80-1.25 | 0.44-0.65 |
| T22 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.035 | 0.5 | 1.90-2.60 | 0.87-1.13 |
Heat Treatment Requirements
| Grade | UNS Number | Heat Treat Type | Subcritical Annealing or Tempering Temperature, Min or range °F [°C] |
| T11 | K11597 | full or isothermal anneal normalize and temper | 1200 [650] |
| T12 | K11562 | full or isothermal anneal normalize and temper subcritical anneal | 1200 to 1350[650 to 730] |
| T22 | K21590 | full or isothermal anneal normalize and temper | 1250 [675] |
Tensile Requirements and Hardness
| Mechanical properties | ||||
| Grade | Tensile | Yield | Elongation | Hardness |
| Strength (Mpa) | Strength (Mpa) | (%) | (HRB) | |
| T11 | ≥415 | ≥220 | ≥30 | ≤85 |
| T12 | ≥415 | ≥220 | ≥30 | ≤85 |
| T22 | ≥415 | ≥220 | ≥30 | ≤85 |
