ASTM A213/ASME SA213
T12 Seamless Alloy-Steel Boiler Tubes
ASTM A213/ASME SA213 T12 Seamless Alloy-Steel Boiler Tubes
Short Description:
A213 T12 steel tubes are widely used in boiler superheater, reheater and other heating surface piping, header and main steam pipeline with working temperature not exceeding 550 ℃ such as 300MW and 600MW.
ASTM A213 T12 belongs to 1Cr-1 / 2Mo pearlescent low alloy hot strength steel. A213t12 steel has good processing and welding properties, and has high thermal strength and oxidation resistance under 550 ℃.
Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, and Heat-Exchanger Tubes.
| Standard | Grade |
| ASTM A213 | T12 |
| GB5310 | 15CrMoG |
Manufacture:Seamless process ,Hot-finished or Cold-finished
Wall thickness(WT): 0.9 mm——12.7 mm.
Outer diameter (OD): 12.7 mm——127 mm
Length: 6M or specified length as required.
Ends: Plain End, Beveled End, Threaded
Specification of ASTM A213 T12 Boiler Tubes
| OD (mm) | Wall Thickness(mm) | |||||||||||||
| 2 | 2.5 | 3 | 3.5 | 4 | 4.5 | 5 | 6 | 6.5-7 | 7.5-8 | 8.5-9 | 9.5-10 | 11 | 12 | |
| Φ25-Φ28 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ32 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ34-Φ36 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ38 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ40 | ● | ● | ● | ● | ● | |||||||||
| Φ42 | ● | ● | ● | ● | ● | |||||||||
| Φ45 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ48-Φ60 | ● | ● | ● | ● | ● | ● | ● | |||||||
| Φ63.5 | ● | ● | ● | ● | ● | ● | ● | |||||||
| Φ68-Φ73 | ● | ● | ● | ● | ● | ● | ||||||||
| Φ76 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ80 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ83 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ89 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ95 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ102 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ108 | ● | ● | ● | ● | ● | ● | ● | ● | ● | ● | ||||
| Φ114 | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||
| Φ121 | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||
| Φ127 | ● | ● | ● | ● | ● | ● | ● | ● | ● | |||||
Materials and Manufacture
ASTM A213 T12 Seamless Ferritic Alloy-Steel Boiler Tubes are made by the seamless process and shall be either hot finished or cold finished, as specified.
Grain Size
Grain size shall be as given in Table 1,
Grain size determinations, shall be made on one end of one finished tube from each lot.
Heat Treatment of ASTM A213 T12
| 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 | ||||||
| T12 | K11562 | full or isothermal anneal | … | … | … | … |
| normalize and temper | … | … | … | … | ||
| subcritical anneal | … | … | 1200 to 1350[650 to 730] | … | ||
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.
Chemical Composition of ASTM A213 T12 Seamless Boiler Tubes
| Grade | Chemical Composition(%) | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| A213 T12 | 0.05-0.15 | 0.30-0.60 | ≤0.025 | ≤0.025 | ≤0.50 | 0.80-1.25 | 0.45-0.65 |
Mechanical Properties of ASTM A213 T12 Seamless Boiler Tubes
| Low Alloy Steels | ||||||
| Grade | UNS Designation | Tensile Strength, min, ksi [MPa] | Yield Strength, min, ksi [MPa] | Elongation in 2 in. or 50 mm, min, % | Hardness | |
| Brinell/Vickers | Rockwell | |||||
| T12 | K11562 | 60 [415] | 32 [220] | 30 | 163 HBW/ 170 HV | 85 HRB |
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.
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
| Pecified 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.
ASTM A213 T12 Seamless Boiler Tubes Marking
In addition to the marking prescribed in Specification ASTM A1016/A1016M, the marking shall indicate whether the tube is hot-finished or cold-finished.
Marks of ASTM A213 T12 Seamless Boiler Tubes
Note: Material furnished under ASTM A213 conform to the applicable requirements of the current edition of Specification A1016/A1016M