Our carbon steel butt-welding fittings are up to ANSI B16.9 / B16.11 / B16.28, DIN2605-2642, JIS, and ISO standards, including long and short elbows, straight and reducing tees, concentric and eccentric reducers, bends, caps and crossovers (four channels). The wall thicknesses are divided into SCH10, SCH20, SCH30, STD, SCH40, and SCH80. The specifications range from 1/2 to 48". They are widely used in the fields of electric power, petrochemical, chemical, medicine, boiler and ship-building industry.