The T91 steel grade specified in ASTM A213 is used to manufacture ferrite and austenite boiler superheater and heat exchanger seamless steel pipes.
A213 T91 boiler steel pipe is a steel pipe material in the US ASTM/ASME national standard. It not only has high oxidation resistance and high-temperature steam corrosion resistance, but also has good impact toughness, high and stable long-lasting plasticity and thermal strength. When the operating temperature is lower than 620℃, its allowable stress is higher than that of austenitic stainless steel.
A213 T91 seamless steel pipe can be used as high-temperature superheater and reheater steel pipes for subcritical and supercritical boilers with a wall temperature of ≤625℃, as well as high-temperature headers and steam pipes with a wall temperature of ≤600℃. It can also be used as nuclear power heat exchangers and petroleum cracking unit furnace tubes.
Chemical Composition of T91 Alloy Steel Seamless Tubes
|
C, % |
Mn, % |
P, % |
S, % |
Si, % |
Cr, % |
Mo, % |
V, % |
N, % |
Ni, % |
Al, % |
Nb, % |
|
0.08-0.12 |
0.3-0.6 |
0.02 max |
0.01 max |
0.2-0.5 |
8.0-9.5 |
0.85-1.05 |
0.18-0.25 |
0.03-0.07 |
0.4 max |
0.04 max |
0.06-0.10 |
Mechanical Properties of Alloy Steel A213 T91 Seamless Tubes
| Tensile Strength, MPa | Yield Strength, MPa | Elongation, % | Hardness, HB |
| 585 min | 415 min | 20 min | 250 max |
High Pressure T91 Boiler Tube
ASTM A213 T91 pipes are available in sizes ranging from ½ OD to 5 OD, with custom diameters available according to customer requirements. A series of inspections and tests are conducted to ensure its quality and performance. These inspections and tests include chemical reports, factory inspection certificates, mechanical reports, visual inspection reports, destructive test reports and third-party inspection reports, etc.
Alloy Steel A213 T91 Seamless Tubing Tolerance
| Outside Diameter | OD Tolerance | WT Tolerance | Ovality Tolerance | Cut Length Tolerance |
| OD≤ 12, 7 mm | ± 0, 13 mm | ± 15 % | – | + 3, 18 mm, – 0 mm |
| 12, 7 mm < OD ≤ 38, 1 mm | ± 0, 13 mm | ± 10 % | max, 1, 65 mm | + 3, 18 mm, – 0 mm |
| 38, 1 mm < OD ≤ 88, 9 mm | ± 0, 25 mm | ± 10 % | max, 2, 41 mm | + 4, 76 mm, – 0 mm |
GNEE have passed ISO9001, TS16949, BV and other internationally renowned certification agencies. Steel pipe products are widely used in various fields, with customers in Africa, Europe, America, etc.
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