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| Place of Origin | CHINA |
| Brand Name | Joyruns |
| Certification | ISO9001 |
| Model Number | 6--160MM |
ASTM A213 T22 alloy seamless steel tube
Application:
Allowable operating temperature: it is mainly used for superheaters with wall temperatures ≤ 580 ° C and steam pipes and headers with wall temperatures ≤ 540 ° C of large capacity power station boilers such as 300. 600MW. This kind of steel has been widely used in the United States, Japan, and Europe. It has a long history in power plant operation and is a mature steel with stable running and good process performance.
T22 tubing belongs to ASTM A213 which does Ferrite and Austenitic boiler superheater and heat exchanger seamless steel tube
T22 and P22 steel pipes are included in ASME (American Society of Mechanical Engineers) or ASTM (American Society for Testing Material) suited for superheater tubes, steam lines headers, and similar purposes where temperatures up to about 590 °C.
But for ASTM A335 P22 tubing, they intended for Ferritic and alloy seamless steel tubes intended for high-temperature service.
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.
Heat Treatment of ASTM A213 T22
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 S |
| Ferritic Alloy Steels | ||||||
| T22 | K21590 | full or isothermal anneal | … | … | … | … |
| normalize and temper | … | 1250 [675] | … | |||
Note: 1.Heat treatment shall be carried out separately and in addition to heating for hot forming.
2.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 | ||||||
Tolerances of Outside Diameter
| Specified Outside Diameter,in. [mm] | Permitted Variations, in. [mm] | |
| Over | Under | |
| Hot-Finished Seamless Tubes | ||
| 4 [100] or under | 1 ⁄ 64 [0.4] | 1 ⁄ 32 [0.8] |
| Over 4 to 7 1 ⁄ 2 [100 to 200], incl | 1 ⁄ 64 [0.4] | 3 ⁄ 64 [1.2] |
| Over 7 1 ⁄ 2 to 9 [200 to 225], incl | 1 ⁄ 64 [0.4] | 1 ⁄ 16 [1.6] |
| Cold-Finished Seamless Tubes | ||
| Under 1 [25] | 0.004 [0.1] | 0.004 [0.11] |
| 1 to 1 1 ⁄ 2 [25 to 40], incl | 0.006 [0.15] | 0.006 [0.15] |
| Over 1 1 ⁄ 2 to 2 [40 to 50], excl | 0.008 [0.2] | 0.008 [0.2] |
| 2 to 2 1 ⁄ 2 [50 to 65], excl | 0.010 [0.25] | 0.010 [0.25] |
| 2 1 ⁄ 2 to 3 [65 to 75], excl | 0.012 [0.3] | 0.012 [0.3] |
| 3 to 4 [75 to 100], incl | 0.015 [0.38] | 0.015 [0.38] |
| Over 4 to 7 1 ⁄ 2 [100 to 200], incl | 0.015 [0.38] | 0.025 [0.64] |
| Over 7 1 ⁄ 2 to 9 [200 to 225], incl | 0.015 [0.38] | 0.045 [1.14] |
Tolerances of Length
| Method of Manufacture |
Specified Outside Diameter, in.[mm] |
Cut Length, in. [mm] | |
| Over | Under | ||
| Seamless, hot-finished | All sizes | 3 ⁄ 16 [5] | 0 [0] |
| Seamless, cold-finished | Under 2 [50.8] | 1 ⁄ 8 [3] | 0 [0] |
| 2 [50.8] or over | 3 ⁄ 16 [5] | 0 [0] | |
| 2 [50.8] or over | 3 ⁄ 16 [5] | 0 [0] | |
Hydrostatic or Nondestructive Electric Test
Each tube will be subjected to the nondestructive electric test or the hydrostatic test.
Tests
(1)Tension test——One tension test shall be made on a specimen from one tube for lots of not more than 50 tubes. Tension tests shall be made on specimens from two tubes for lots of more than 50 tubes.
(2)Hardness Requirements—— Brinell, Vickers, or Rockwell hardness tests shall be made on specimens from two tubes from each lot.
(3)Flattening Test——One flattening test shall be made on specimens from each end of one finished tube.
(4)Flaring Test——One flaring test shall be made on specimens from each end of one finished tube.
Surface Condition
Ferritic alloy cold-finished steel tubes are free of scale and suitable for inspection.
Ferritic alloy hot-finished steel tubes are free of loose scale and suitable for inspection.
Note: Material furnished under ASTM A213 conform to the applicable requirements of the current edition of Specification A1016/A1016M
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