ASTM A106 grade A steel is carbon steel. It is also shorten as A106 Gr A or A106A. ASTM A106 grade A steel is equivalent to ASME SA106 grade A. The ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe is for high-temperature service. Its size is within range from NPS 1/8 to NPS 48 [DN 6 to DN 1200] inclusive, with nominal wall thickness as given in ASME B36.10M. The other size ASTM A106 grade A steel pipes can also be supplied if they totally meet the requirements of ASTM A106/A106 standard. ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe shall be suitable for welding, bending, flanging, and similar forming operations. 

ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe chemical composition:

ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe mechanical properties:

For NPS 1-1/2 [DN 40] and under, the ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe shall be furnished hot finished or cold drawn. Cold-drawn A106 grade A steel pipe shall be heat treated after the final cold draw pass at a temperature of 1200 °F [650 °C] or higher. 

For NPS 2 [DN 50] and over, the ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe shall be furnished hot finished unless otherwise specified. When agreed upon between the A106 grade A  pipe manufacturer and the purchaser, it is permissible to furnish cold-drawn pipe. Hot-finished A106 grade A steel pipe needs not be heat treated. When hot-finished A106 grade A pipe is heat treated, it shall be heat treated at a temperature of 1200 °F [650 °C] or higher.

ASTM A106 grade A carbon steel tube A106 Gr A seamless pipe is commonly used in refineries and plants when gasses or fluids are transported at high temperatures and pressures.