Chemical composition (%) of ASTM A213 ASME SA213 T2 Seamless Steel Tubes
| Grade | Chemical composition | ||||||
| C | Si | Mn | P | S | Cr | Mo | |
| SA213 T2 | 0.10-0.20 | 0.10-0.30 | 0.30-0.61 | ≤0.025 | ≤0.025 | 0.50-0.81 | 0.44-0.65 |
Mechanical Properties of ASTM A213 ASME SA213 T2 Seamless Steel Tubes
| Grade | Mechanical properties at room temperature | |||
| Tensile strength | Yield strength | Elongation | HardnessHB(HRB) | |
| SA-213 T2 | ≥ 415 | ≥205 | ≥ 30 | ≤163(85) |
Metallographic structure
The delivery state of ASME SA213 T2 seamless steel tubes are normalizing and tempering, and the microstructure is ferrite + sorbite.
Heat Treatment:
ASTM SA213 T2 Seamless Alloy-Steel Boiler Tubes shall be reheated for heat treatment in accordance with the requirements of Table 1.
TABLE 1 Heat Treatment and Grain Size Requirements
| Grade | UNS Number |
Heat Treat Type | Austenitizing/ Solutioning Temperature, min or range ºF [ºC] |
Cooling Media | Subcritical Annealing or Tempering Temperature, min or range ºF [ºC] |
|
| ASTM Grain Size No.B |
||||||
| Ferritic Alloy Steels | ||||||
| T2 | K11547 | normalize and temper | … | … |
1200 to 1350 [650 to 730] |
… |
B ASTM Grain Size No. listed, or coarser, unless otherwise indicated.
The dimensional tolerances of ASTM A213 Seamless Boiler Tubes
Tolerances of Wall Thickness
| Wall Thickness, % | ||||||||
| Outside Diameter in. [mm] |
0.095 [2.4] and Under | Over 0.095 to 0.150[2.4 to 3.8], incl | Over 0.150 to 0.0180 [3.8 to 4.6], incl |
Over 0.180 [4.6] | ||||
| Over | Under | Over | Under | Over | Under | Over | Under | |
| Seamless, Hot-Finished Tubes | ||||||||
| 4 [100]and under | 40 | 0 | 35 | 0 | 33 | 0 | 28 | 0 |
| Over 4 [100] | .... | .... | 35 | 0 | 33 | 0 | 28 | 0 |
| Seamless, Cold-Finished Tubes | ||||||||
| Over | Under | |||||||
| 1 1⁄2[38.1]and,under | 20 | 0 | ||||||
| Over 1 1 ⁄ 2 [38.1] | 22 | 0 | ||||||
