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ASTM A210/ASME SA210 specification coversseamless medium-carbon steel boiler and superheater tubes. The specification also covers minimum-wall-thickness, tubing sizes, boiler flues including safe ends, arch and stay tubes. The specification provides tensile and hardness properties but only applicable to certain size limitations. Material manufacturing shall be killed. Tubes shall be made by seamless process, marked as either hot-finished or cold-finished. Surface condition shall be specifically stated in the order. Chemical composition shall conform to the requirements. Elemental composition other than listed here shall not be permitted. Tension test, flattening test, flaring test, hardness test, hydrostatic or nondestructive electric test shall be made on specimens. Superheater tubes shall be formed without defects and shall withstand expansion, beading, forging, welding, and bending.
ASTM A210 is the standard covers seamless medium-carbon steel boiler and superheater tubes. Seamless medium carbon steel pipe for boiler tube and boiler flue pipe, including a minimum wall thickness of the security side, the dome and the support tube and superheater tubes.
Specification：
Outside Diameter & Tolerance
|
Pcorcess |
Outside Diameter , mm |
Tolerance, % |
|
Hot rolled |
OD≤101.6 |
+0.4/-0.8 |
|
101.6＜OD≤127 |
+0.4/-1.2 |
|
|
|
|
|
|
Cold Drawn |
OD＜25.4 |
±0.10 |
|
25.4≤OD≤38.1 |
±0.15 |
|
|
38.1＜OD＜50.8 |
±0.20 |
|
|
50.8≤OD＜63.5 |
±0.25 |
|
|
63.5≤OD＜76.2 |
±0.30 |
|
|
76.2≤OD≤101.6 |
±0.38 |
|
|
101.6＜OD≤127 |
+0.38/-0.64 |
Wall thickness & Tolerance
|
Pcorcess |
Outside Diameter , mm |
Tolerance, % |
|
Hot rolled |
OD≤101.6, WT≤2.4 |
+40/-0 |
|
OD≤101.6, 2.4＜WT≤3.8 |
+35/-0 |
|
|
OD≤101.6, 3.8＜WT≤4.6 |
+33/-0 |
|
|
OD≤101.6, WT>4.6 |
+28/-0 |
|
|
OD>101.6, 2.4＜WT≤3.8 |
+35/-0 |
|
|
OD>101.6, 3.8＜WT≤4.6 |
+33/-0 |
|
|
OD>101.6, WT>4.6 |
+28/-0 |
|
|
Cold Drawn |
OD≤38.1 |
+20/-0 |
|
OD>38.1 |
+22/-0 |
ASTM A210 / A210M Tube Wall Thickness Tolerance
|
Seamless, Cold-Finished Tubes |
||
|
Outside Diameter |
Wall thickness Tolerance % |
|
|
Over (+) |
Under (-) |
|
|
1 ½ (38.1) and under |
20 |
0 |
|
Over 1½ (38.1) |
22 |
0 |
ASTM A210 / A210M Tube Outside Diameter Tolerance
|
Cold-Finished Seamless Tubes |
||
|
Outside Diameter |
Permissible Variations In. (mm) |
|
|
Over (+) |
Under (-) |
|
|
Under 1 (25.4) |
0.004 (0.10) |
0.004 (0.10) |
|
1 to 1 ½ (25.4 to 38.1), Incl |
0.006 (0.15) |
0.006 (0.15) |
|
Over 11⁄2 to 2 (38.1 to 50.8), Excl |
0.008 (0.20) |
0.008 (0.20) |
|
2 to 21⁄2 (50.8 to 63.5), Excl |
0.010 (0.25) |
0.010 (0.25) |
|
21⁄2 to 3 (63.5 to 76.2), Excl |
0.012 (0.30) |
0.012 (0.30) |
ASTM A210 / A210M Tube Cut Length Tolerance
|
Cold-Finished Seamless Tubes |
||
|
Outside Diameter, |
Cut Length, in.(mm) |
|
|
Over (+) |
Under (-) |
|
|
All Sizes |
3⁄16 [5] |
0 [0] |
|
Under 2 (50.8) |
1⁄8 [3] |
0 [0] |
|
2 (50.8) and over |
3⁄16 [5] |
0 [0] |
|
Under 2 (50.8) |
1⁄8 [3] |
0 [0] |
|
2 (50.8) and over |
3⁄16 [5] |
0 [0] |
|
These permissible variations in length apply to tubes before bending. They apply to cut lengths up to and including 24 ft [7.3 m]. For lengths greater than 24 ft [7.3 m], the above over-tolerances shall be increased by 1⁄8 in. [3 mm] for each 10 ft [3 m] or fraction thereof over 24 ft or 1⁄2 in. [13 mm], whichever is the lesser. |
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