YB 4102 Welded Steel Tubes for Low- and Medium-Pressure Boilers YB 4102-2000 covered electrically welded carbon steel boiler tubes in Grades 10 and 20. Historical references list outside diameters of 10–114 mm and nominal wall thicknesses of 1.5–6.0 mm in specified combinations. China’s standards registry lists YB 4102-2000 as withdrawn. If an existing boiler drawing calls for it, confirm the governing boiler code and obtain the responsible engineer’s approval of the material
YB 4102 Welded Steel Tubes for Low- and Medium-Pressure Boilers YB 4102-2000 covered electrically welded carbon steel boiler tubes in Grades 10 and 20. Historical references list outside diameters of 10–114 mm and nominal wall thicknesses of 1.5–6.0 mm in specified combinations. China’s standards registry lists YB 4102-2000 as withdrawn. If an existing boiler drawing calls for it, confirm the governing boiler code and obtain the responsible engineer’s approval of the material