Size:1/2'' - 48'' Standard: API 5L, ASTM A106/A53, JIS G3456/3461 , ... BV, etc. Steel Pipe for Boiler with JIS Standard1.Specification Type Seamless PipePipe Size1/2"—48" (DN15-1200)Wall ThicknessSCH10,SCH20,SCH30 ... construction ,shipbuilding,smelting, aviation, power, foodstuff, papermaking, chemical, medical equipment, boiler heat, exchanger, gas metallurgy, Surface Black painting, varnish,FBE, 3PE ...