CN code 730300 of the Combined Nomenclature covers tubes and pipes of cast iron used in water supply, sewerage and industrial piping systems. Cast iron, an alloy of iron with carbon content above 2%, offers high resistance to corrosion and abrasion. Key types include grey cast iron, ductile iron (spheroidal graphite iron) and malleable cast iron. Ductile iron pipes, with their higher tensile strength, are increasingly replacing grey iron pipes in pressure applications. Classification under heading 7303 is distinguished from steel pipes (7304-7306) on the basis of material composition - the determining factor is carbon content above 2% and characteristic microstructure. A material certificate with chemical analysis is essential for correct classification. Standards EN 545 (drinking water pipes), EN 598 (sewerage pipes) and EN 969 govern technical requirements. Cast iron pipes are mainly used in diameters from DN 80 to DN 2000, at working pressures up to 64 bar depending on diameter and pressure class.

Importing cast iron pipes under CN code 730300 into the European Union is subject to the Union Customs Code. Required documents include a commercial invoice with technical parameters, material certificate with chemical analysis and mechanical properties, transport document and certificate of origin. Pipes for drinking water must hold a hygienic approval in accordance with the national regulations of the destination country. The Pressure Equipment Directive (PED 2014/68/EU) may require CE marking and technical documentation where pipes are classified in relevant pressure categories. Finished cast iron products under Chapter 73 are generally not subject to CBAM, as Annex I of Regulation (EU) 2023/956 primarily covers semi-finished steel products. However, importers should verify the current CBAM scope. Pipes intended for pressure installations above 0.5 bar require a full PED conformity assessment procedure, including notified body involvement for higher pressure categories.

Cast iron pipes under CN code 730300 may be subject to EU safeguard measures on steel products in TRQ form with an additional 25% duty. Importers should verify in TARIC whether the subheading is currently covered by safeguard measures and the quota utilisation status. Anti-dumping duties may apply to cast iron pipes from China - current status should be checked in TARIC. Imports from Russia and Belarus are subject to EU sanctions prohibitions. Preferential rates are available under EU free trade agreements such as CETA, EU-Japan EPA and GSP, provided rules of origin are met. Major global producers of ductile iron pipes include companies from France, Germany, China, India and Turkey. Total import costs include MFN duty, any AD duties, safeguard surcharge and VAT (23% in Poland). Current rates and trade measures should be verified in TARIC.

CN code 7303 00 of the Combined Nomenclature covers cast iron tubes and pipes within Chapter 73, which deals with articles of iron or steel. Classification in this chapter is based on the type of article, its intended use, manufacturing method (casting, forging, welding, stamping) and base material (cast iron, non-alloy steel, stainless steel or alloy steel). Correct classification requires analysis of technical documentation. Where classification is uncertain, importers can obtain Binding Tariff Information (BTI) ruling from customs authorities, valid for three years throughout the EU.