The chemical composition of ASTM A213 T22 alloy steel pipe mainly includes iron, chromium, nickel, molybdenum and other elements. Iron is the main element of the steel pipe, with a content of more than 90%. The content of chromium and nickel is also relatively high, 2.5% and 1.5 respectively. %about. In addition, the alloy also contains a certain amount of molybdenum, which can effectively improve the high-temperature strength and corrosion resistance of steel pipes.
ASTM A213 T22 seamless alloy steel pipe has excellent high temperature performance and mechanical properties, such as high temperature strength, oxidation resistance, corrosion resistance, etc. It can work at high temperatures of 650℃ for a long time and has good creep resistance and lasting strength. , can have good corrosion resistance in various acid, alkali, salt and other corrosive media, and is suitable for some harsh environments.
Heat Treatment of ASTM A213 T22
| 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 S |
| Ferritic Alloy Steels | ||||||
| T22 | K21590 | full or isothermal anneal | … | … | … | … |
| normalize and temper | … | 1250 [675] | … | |||
Chemical Composition of ASTM A213 T22 Seamless Boiler Tubes
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| A213 T22 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 |
Mechanical Properties of ASTM A213 T22 Seamless Boiler Tubes
| Grade | Tensile Strength(MPa) | Yield Strength(MPa) | Elongation(%) | Hardness(HB) |
| A213 T22 | ≥415 | ≥205 | 30 | ≤163 |
Mechanical property requirements do not apply to tubing smaller than 1 ⁄ 8in. [3.2 mm] in inside diameter or thinner than 0.015 in. [0.4 mm] in thickness.
