Production process of internal groove type austenitic stainless steel seamless steel pipe for efficient heat exchanger

The invention discloses a production process of an internal groove type austenitic stainless steel seamless steel pipe for an efficient heat exchanger. The method comprises the steps that firstly, a raw material pierced billet with the outer diameter of 66-69 mm and the thickness of 5.5 mm is selected, the inner surface and the outer surface of the pierced billet are polished and ground, and the inner surface and the outer surface of the pierced billet are free of cracks and other defects; secondly, the pierced billet is cold-rolled into a 38 * 2.9 mm pipe, then oil dirt on the surface of the 38 * 2.9 mm pipe is removed, then the 38 * 2.9 mm pipe is subjected to heat treatment at the temperature of 1100 DEG C for 15 min, finally acid pickling is conducted, and it is guaranteed that oxide skin on the inner surface and the outer surface of a product fully falls off after acid pickling; and thirdly, the 38 * 2.9 mm pipe is cold-rolled into a 22 * 2.33 mm pipe, then oil dirt on the surface of the 22 * 2.33 mm pip