In ASTM A213, in addition to the requirements for tensile properties and hardness, the following tests are also required: Flattening Test and Flaring Test.
ASTM A213 T11 (ASME SA213 T11) is a low-alloy seamless steel tube containing 1.00–1.50% Cr and 0.44–0.65% Mo, with excellent heat-resistant properties, suitable for high-temperature and high-pressure applications.
T11 is commonly used in boilers, superheaters, and heat exchangers. UNS number: K11597.
Manufacturer and Condition
ASTM A213 T11 steel pipes shall be made by the seamless process and shall be either hot finished or cold finished, as specified.
Heat Treatment
T11 steel pipes shall be reheated for heat treatment according to the following methods, and the heat treatment shall be carried out separately and in addition to heating for hot forming.
| Grade | Heat treat type | Subcritical Annealing or Temperature |
| ASTM A213 T11 | full or isothermal anneal | — |
| normalize and temper | 1200 ℉ [650 ℃] min |
| Grade | Composition, % | ||||||
| C | Mn | P | S | Si | Cr | Mo | |
| T11 | 0.05 ~ 0.15 | 0.30 ~ 0.60 | 0.025 max | 0.025 max | 0.50 ~ 1.00 | 1.00 ~ 1.50 | 0.44 ~ 0.65 |
Tensile Properties
| Grade | Tensile Strength | Yield Strength | Elongation in 2 in. or 50 mm |
| T11 | 60 ksi [415 MPa] min | 30 ksi [205 MPa] min | 30 % min |
Hardness Properties
| Grade | Brinell/Vickers | Rockwell |
| T11 | 163 HBW / 170 HV | 85 HRB |
Other Test Items
Dimension Range
ASTM A213 T11 tubing sizes and wall thicknesses are usually furnished with inside diameters ranging from 3.2 mm to outside diameters of 127 mm, and minimum wall thicknesses from 0.4 mm to 12.7 mm.
Other sizes of T11 steel pipes can also be supplied, provided that all other requirements of ASTM A213 are met.
Wall Thickness Tolerances
The wall thickness tolerance should be determined based on the following two cases: whether the order is specified according to the minimum wall thickness or the average wall thickness.
1. Minimum wall thickness: It shall comply with the relevant requirements of Section 9 of ASTM A1016.
| Outside Diameter in.[mm] | Wall Thickness, in [mm] | |||
| 0.095 [2.4] and under | Over 0.095 to 0.150 [2.4 to 3.8], incl | Over 0.150 to 0.180 [3.8 to 4.6], incl | Over 0.180 [4.6] | |
| Hot-finished Seamless Tubes | ||||
| 4 [100] and under | 0 - +40 % | 0 - +35 % | 0 - +33 % | 0 - +28 % |
| Over 4 [100] | — | 0 - +35 % | 0 - +33 % | 0 - +28 % |
| Cold-finished Seamless Tubes | ||||
| 1 1/2 [38.1] and under | 0 - +20 % | |||
| Over 1 1/2 [38.1] | 0 - +22 % | |||
2. Average wall thickness: For cold-formed tubes, the permissible variation is ±10%; for hot-formed tubes, unless otherwise specified, the requirements shall comply with the following table.
| Specified Outside Diameter, in. [mm] | Tolerance from specified |
| 0.405 to 2.875 [10.3 to 73.0] incl, all t/D ratios | -12.5 - 20 % |
| Above 2.875 [73.0]. t/D ≤ 5 % | -12.5 - 22.5 % |
| Above 2.875 [73.0]. t/D ＞ 5 % | -12.5 - 15 % |
Out Diameter Inspection
Wall Thickness Inspection
End Inspection
Straightness Inspection
UT Inspection
Appearance Inspection
ASTM A213 T11 steel pipes are widely used due to their excellent performance, primarily in boilers, superheaters, heat exchangers, chemical pipelines and vessels, as well as other high-temperature components.
Material: ASTM A213 T11 seamless steel pipes and fittings;
Size: 1/8" to 24", or customized according to your requirements;
Length: Random length or cut to order;
Packaging: Black coating, beveled ends, pipe end protectors, wooden crates, etc.
Support: IBR certification, TPI inspection, MTC, cutting, processing, and customization;
MOQ: 1 m;
Payment Terms: T/T or L/C;
Price: Contact us for the latest T11 steel pipe prices;
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