Prospects for the use of u-shaped welded pipes of steel a316l heat transfer assortment in chemical engineering

Abstract

To expand the possibilities of using welded stainless steel pipes in chemical engineering, comprehensive studies of the experimental batch of straight-seam and U-shaped laser-welded tubes of A316L steel have been performed. The corrosion resistance, strength and structural-phase changes in the product material during austenization were studied: short-term annealing at 1000 °C. It is shown that longitudinal welded pipes have a high margin of ductility. This opens up prospects for their wide application for the production of bent assortment in the form of U-shaped products. It has been experimentally proved that heat treatment according to the regime of short-term austenization completely eliminates metal hardening, providing relaxation of its elastic stresses and the formation of the structural state necessary for technological redistribution of A316L steel. Heat treatment according to the mode of short-term austenization at a temperature of 1000–1050 °C for 1–5 minutes can be recommended as a mandatory technological operation that completes the metallurgical conversion of laser-welded stainless tubes of heat-exchange gauge.

Identifying some regularities of the heat transfer in the welded joint of SUS304 pipe using a numerical approach

“…With a weld overlay, the repaired section of liner may be permanently sealed off and made to sit flat with the pipe's outside. As a result, the liner is securely fastened to the steel skeleton [1]. The two lined pipes are then joined with a girth weld.…”