Steel and wrought iron are recommended for use in acetylene piping. Rolled, forged, or cast steel, or malleable iron fittings may be used. Cast iron is not permissible for fittings.

• 乙炔管道推荐使用钢和熟铁。可以使用轧制钢、铸钢或坩埚钢、或者铸铁装置，不允许用生铁。