ASTM A213 / ASME SA213 T12 Seamless steel Tubes
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ASTM A213 T12 is a type of seamless alloy steel tube that is designed for high-temperature and high-pressure applications. It’s also known as a chrome moly tube because it’s made of carbon steel with added chromium and molybdenum.
ASTM A213 is the Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes
This specification covers seamless ferritic and austenitic steel boiler, superheater, and heat-exchanger tubes, designated Grades T5, TP304, etc.
These steels are listed in Tables 1 and 2. 1.2 Grades containing the letter, H, in their designation, have requirements different from those of similar grades not containing the letter, H. These different requirements provide higher creep-rupture strength than normally achievable in similar grades without these different requirements.
The ASTM A213 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. Tubing having other diameters may be furnished, provided such tubes comply with all other requirements of this specification.
ASTM A213 Tube Materials and Manufacture
Tubes shall be made by the seamless process and shall be either hot finished or cold finished
ASTM A213 T12 Tube heat treatment
normalize and temper at 675 deg
ASTM A213 T12 Composition and Mechnical properties
| Steel Grade | ASME/ASTM | JIS | |
| SA/A213-T12 | STBA 22 | ||
| Chemical Composition (%) |
Carbon (C) | 0.05~0.15 | 0.15 max |
| Silicon (Si) | 0.50 max | 0.50 max | |
| Manganese (Mn) | 0.30~0.61 | 0.30~0.60 | |
| Phosphorus (P) | 0.025 max | 0.035 max | |
| Sulfur (S) | 0.025 max | 0.035 max | |
| Chromium (Cr) | 0.80~1.25 | 0.80~1.25 | |
| Molybdenum (Mo) | 0.44~0.65 | 0.45~0.65 | |
| Proof Stress (N/㎟) | 220 min | 205 min | |
| Tensile Strength (N/㎟) | 415 min | 410 min | |
| Hardness (max) | 163HBW/170HV/85HRB | 85 HRB | |
ASTM A213 ASME SA213 T12 tube Hydrostatic or Nondestructive Electric Test
Each tube shall be subjected to the nondestructive electric test or the hydrostatic test. The type of test to be used shall be at the option of the manufacturer, unless otherwise specified in the purchase order.
ASTM A213 ASME SA213 T12 tube Product Marking
In addition to the marking prescribed in Specification A1016/A1016M, the marking shall include: the condition, hot finished or cold finished; and the wall designation, minimum wall or average wall.
WALL THICKNESS TOLERANCE ASTM A213 TUBE
| NPS | ASTM A213 Tube Tolerance, % | |
| + | – | |
| 1/8-2 1 /2 | 20.0 | 12.5 |
| 3~18, t/D≤ 5% | 22.5 | 12.5 |
| 3~18, t/D> 5% | 15.0 | 12.5 |
| ≥ 20, welded | 17.5 | 12.5 |
| ≥ 20, seamless, t/D≤ 5% | 22.5 | 12.5 |
| ≥ 20, seamless, t/D> 5% | 15.0 | 12.5 |
