Steel grade S235JR is actively used to implement civil engineering solutions. Steel structures are made from S235JR steel for the construction of industrial and residential facilities, parts of power transmission towers, elements of equipment, offshore structures, oil and EN 10219 Grade S235JR Steel Pipes EN 10219 Square Tube Cold formed EN 10219 Grade S235JR Steel Pipes are well suited for welding structures. These pipes are essentially referred to as structural hollow sections produced from either non-alloy steels or fine grain steels. The EN 10219 specification is segregated into two parts. While part 1 covers the Technical delivery conditions of the en 10219 pipe.