Problems with welding steel T24 intended for membrane walls of boilers

Abstract

We present the issues connected with the manufacture of waterwalls made of modern 7CrMoVTiB10-10 (T24) steel by submerged and TIG welding methods. We give the results of mechanical testing and structural examination of parent materials and welding consumables used for the manufacture of welded joints as well as the results of weldability and crack resistance testing for T24 steel. Possible reasons for cracking in welded joints as well as the usability of T24 steel for construction of responsible elements of waterwalls in advanced power boilers is discussed.

Notes

The paper is dedicated to the memory of Dr Eng. Jerzy Brozda, an outstanding specialist in the field of weldability of constructional steels, who has had an inestimable share in explanatation of reasons of T24 steel waterwalls cracking.