for non-alloy steel tubes, with specified characteristics at ambient temperature:
– Outer diameter: 21.3 ÷ 114.3 mm;
– Wall thickness: 2.4 ÷ 4.1 mm;
The processes, manufacturing technologies, and delivery conditions for pressure welded tubes are specified in SR EN 10217-1 / EN 10217-1.
Steel grades, with specified characteristics at ambient temperature, for welded tubes used under pressure are P195TR1; P195TR2; P235TR1; P235TR2; P265TR1; P265TR2.
The grades with the TR1 symbol do not specify the aluminum content, the shock bending characteristics, the conditions for the tests, and the specific inspection.
The grades with the TR2 symbol specify the aluminum content, the shock bending characteristics, and the conditions for the specific tests and inspection.