A209 alloy pipe is an alloy steel pipe conforming to American standards and belongs to the alloy steel pipe category. It possesses oxidation resistance, high-temperature steam corrosion resistance, and good impact toughness, creep ductility, and thermal strength. Its allowable stress below 620°C is higher than that of austenitic stainless steel. It is mainly used in ultra-high temperature boiler tubes, high-temperature superheaters, reheater steel pipes, high-temperature headers, steam pipelines, as well as nuclear power heat exchangers and petroleum cracking unit furnace tubes.
Chemical Composition Of SA 209 Steel Pipe, A209 Grade T1, T1a & T1b
| Grade |
Mo |
Cr |
Mn |
P |
S |
C |
Si |
| T1 |
0.44-0.65 |
/ |
0.30-0.80 |
≤0.025 |
≤0.025 |
0.10-0.20 |
0.10-0.50 |
| T1a |
0.44-0.65 |
/ |
0.30-0.80 |
≤0.025 |
≤0.025 |
0.15-0.25 |
0.10-0.50 |
| T1b |
0.44-0.65 |
/ |
0.30-0.80 |
≤0.025 |
≤0.025 |
0.14max |
0.10-0.50 |
Mechanical Properties of ASTM A209 Steel Pipe
| Grade |
T1 |
T1a |
T1b |
| Tensile Strength min Ksi(Mpa) |
55(380) |
60(415) |
43(365) |
| Yield Strength Min Ksi(Mpa) |
30(205 |
32(220) |
28(195) |
| Elongation in 2in or 50mm min% |
30 |
30 |
30 |
Inspection and Testing:
Tensile Test: For batches of no more than 50 steel pipes, one sample should be randomly selected for a tensile test to verify the tensile strength of the steel pipe.
Flattening Test: One sample should be taken from each end of each finished pipe for a flattening test to examine the deformation of the steel pipe during the flattening process, in order to determine its toughness and structural strength.
Flanging Test: Similarly, one sample should be taken from each end of each finished pipe for a flaring test to examine the deformation capacity of the pipe end during the flaring process, reflecting the ductility of the steel pipe.
Hardness Test: Two steel pipes should be randomly selected from each batch for Brinell or Rockwell hardness testing to ensure that the hardness of the steel pipe meets the standard requirements.
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