This standard specifies the carbon steel, alloy steel and austenitic stainless steel butt-welding pipe fittings 1 (including elbows, reducing joints, tees, crosses, pipe caps, etc.) with a nominal diameter of 350-1200 mm ) dimensions, tolerances, technical requirements, inspection, marking and packaging. This standard applies to butt-welding pipe fittings made of carbon steel, alloy steel and austenitic stainless steel plates for pipeline engineering in petroleum, chemical, hydropower, metallurgy, textile and other departments. Note: 1) Butt-welding pipe fittings made of steel plates refer to pipe fittings made of steel plates and steel strips with longitudinal welds.
GB/T 13401-1992 history
2017GB/T 12459-2017 Steel buttwelding pipe fittings—Types and parameter