This specification covers seamless carbon steel pipe for high-temperature service. These pipes are suitable for welding, bending, flanging, and similar forming operations. Mechanical testing of the specimens shall include tensile, bending, flattening, hydrostatic and nondestructive electric tests. Specimens undergoing bending tests shall consist of sections cut from a pipe. For flattening tests, the specimens shall be smooth on the ends and burr-free, except when made on crop ends. All tests shall be performed in room temperature. If any test specimen shows flaws it can be discarded and substituted for another test specimen. Before testing, if a specimen has scribe scratches, a retest shall be allowed. A retest shall also be allowed if a specimen breaks in an inside or outside surface flaw.
For ASTM A106 seamless steel pipe could transport fluids or gasses at high temperature and pressure levels, with 3 grades A, B, C, most common used ASTM A106 Grade B is widely used in the projects of oil and gas refineries, power plants, petrochemical plants, boilers.
ASTM A106 grade b seamless pipe
ASTM A106 Gr B seamless pipes (also known as ASME SA106 GR B pipes) is a seamless carbon steel nominal pipe for high temperature use.
ASTM A106 Gr C seamless pipes
ASTM A106 Gr C seamless pipes (also known as ASME SA106 GR C pipes) is a carbon-manganese steel pipe for high-temperature large-diameter boilers and superheaters. Its chemical composition is simple and similar to 20G carbon steel, but its carbon and manganese content is higher, so its yield strength is about 12% higher than that of 20G, and its plasticity and toughness are not bad. The steel has a simple production process and good cold and hot workability. Using it to replace 20G headers (economizer, water wall, low-temperature superheater and reheater header) can reduce the wall thickness by about 10%, which can save material costs, reduce welding workload, and improve headers The stress difference at start-up.
mechanical properties of ASTM A106
|Standard||Grade||Tensile Strength (MPa)||Yield Strength (MPa)|
|ASTM A106||A||≥ 330||≥ 205|
|B||≥ 415||≥ 240|
|C||≥ 485||≥ 275|
Chemical Requirements of ASTM A106 grade a, b and c
|ASTM A106||A||≤ 0.25||≥ 0.10||0.27-0.93||≤ 0.035||≤ 0.035||≤ 0.40||≤ 0.15||≤ 0.40||≤ 0.40||≤ 0.08|
|B||≤ 0.30||≥ 0.10||0.29-1.06||≤ 0.035||≤ 0.035||≤ 0.40||≤ 0.15||≤ 0.40||≤ 0.40||≤ 0.08|
|C||≤ 0.35||≥ 0.10||0.29-1.06||≤ 0.35||≤ 0.35||≤ 0.40||≤ 0.15||≤ 0.40||≤ 0.40||≤ 0.08|