Harmonized System Code Classification

The first two digits of the HS code "73" represent steel products.

Specifically, this chapter covers the following main contents:

• Steel structures: Such as bridges, buildings, towers, etc.
• Cast iron products: Such as pipes, pipe fittings, radiators, etc.
• Steel products: Such as steel plates, steel pipes, steel wires, nails, bolts, nuts, etc.
• Other steel products: Such as springs, chains, fasteners, cutting tools, etc.

Reason for classification:

The establishment of the "73" chapter is to classify and manage various products made of steel, as steel is an important industrial raw material and construction material, and its products are numerous and widely used. By classifying steel products specifically, it facilitates customs statistics, tariff collection, trade management, and the implementation of relevant regulations.

In short, any product whose main component is made of steel is usually classified into the "73" chapter.

The first four digits of the HS code: 7311

Classification description: Cylinders for compressed or liquefied gas, of iron or steel.

Other information:

• General tariff: Free
• Special tariff: None
• Tariff 2: 25%
• Quota quantity: None
• Additional tariffs: None
• Unit of measurement: None

The first six digits of the HS code: 7311.00

Classification: Cylinders for compressed or liquefied gas, of iron or steel

Meaning: Refers to containers made of iron or steel used for storing compressed or liquefied gases, which belong to the "other" category.

The 8-10 digits of the HS code: 7311000030

Classification: Cylinders for compressed or liquefied gas, of iron or steel

Explanation: Refers to seamless steel cylinders without coating, marked with DOT 3A, 3AX, 3AA, 3AAX, 3B, 3E, 3HT, 3T, or DOT-E followed by specific exemption numbers, which have been certified before export and meet the safety requirements of 49 CFR Sections 178.36 to 178.68 or specific exemptions under these requirements.

Examples of products: * Steel gas cylinders for compressed natural gas * Seamless steel containers for liquefied petroleum gas * Steel tanks for industrial gas storage * Steel cylinders for medical oxygen storage * Steel containers for compressed air storage