Application of the internal protective layer from stainless steel to the surface of long-length pipes with an explosive welding

Abstract

This study is devoted to obtaining long-length two-layer corrosion-resistant tube blanks by explosion welding for their subsequent rolling into tubing. The technological scheme of the process was developed, which allowed ensuring high-quality adhesion of the internal corrosion-resistant layer from austenitic stainless steel 08Kh18N10T with a tube blank made of 37G2F hollow structural steel. In the course of study on the experimental production of bimetallic pipes of 2.4 meters in length, the following problems were solved: 1) the choice of optimal collision regimes of the tube elements thrown on each other; 2) the development of the necessary technological equipment to maintain the alignment of the main elements; 3) ensuring full filling of the internal surface of the device with solid-liquid filler without contact with the welding gap (sealing with welded joints); 4) reducing the degree of lateral dispersion of the explosive due to the assembly enhancing in the ground and use a metal formwork; 5) estimation of the relative narrowing of the outer diameter of the bimetallic tube after explosion welding; 6) carrying out ultrasonic control of the continuity of connection of the obtained two-layer pipes in order to reveal the mistreatment zones along the length of the blanks.