ASTM A213/A213M — Seamless alloy steel tubes for boilers/superheaters/heat exchangers
Grades
T5, T9, T11, T12, T22, T91, T911, TP304, TP304L, TP316, TP316L, TP321, TP347
Chemical composition and mechanical properties
| Grade | Chemical composition | Mechanical properties |
|---|---|---|
| T5 | C≤0.15, Mn 0.30-0.60, P≤0.030, S≤0.030, Si≤0.50, Cr 4.00-6.00, Mo 0.45-0.65 | Rm ≥415 MPa, Rp0.2 ≥205 MPa, A≥30%, HB≤163 |
| T9 | C≤0.15, Mn 0.30-0.60, P≤0.030, S≤0.030, Si≤0.50, Cr 8.00-10.00, Mo 0.90-1.10 | Rm ≥415 MPa, Rp0.2 ≥205 MPa, A≥30%, HB≤179 |
| T11 | C≤0.15, Mn 0.30-0.60, P≤0.030, S≤0.030, Si 0.50-1.00, Cr 1.00-1.50, Mo 0.44-0.65 | Rm ≥415 MPa, Rp0.2 ≥205 MPa, A≥30%, HB≤163 |
Application scope
ASTM A213/A213M specifies seamless alloy steel tubing for boilers, superheaters, heat exchangers, and condensers, covering ferritic grades such as T11, T22, and T91, and austenitic grades such as TP304, TP316, and TP347. It is resistant to high temperatures and creep and is suitable for high-temperature pressure and heat transfer piping.
Typical applications
It is mainly used in superheaters, reheaters and various heat exchanger tubes of power plant boilers, and also in high-temperature corrosive media transportation and condensation pipelines; with its good high-temperature strength, creep resistance and oxidation corrosion resistance, it is suitable for small-diameter, thick-walled boilers, superheaters and heat exchangers pressure-bearing and heat-transferring components that have been in stable service under high temperature and pressure for a long time.
