Introducción al código hs de tubería sin soldadura

Seamless pipe hs code introduction

Seamless pipework is a form of pipe that does not have any weld seams or other imperfections, providing superior strength and pressure integrity. It is extensively used in the construction of oil and gas pipelines, and has a range of applications across a variety of industries. In this article, we will discuss the HS Code of seamless pipe, what that code stands for, and how it affects international trade. We will also look at the different types of seamless pipe, their advantages and disadvantages, and how to select the right type for your application. 

What Is an HS Code?

An HS Code stands for Harmonized System Code and is a collection of codes used to classify products in international trade. It assigns a specific six-digit number to each product and ensures that Customs Authorities, Importers, and Exporters have a common language to use when discussing the goods being purchased or sold. 

HS code of seamless pipes

The HS code for seamless pipes is 7304. The code consists of two parts: the first four digits indicate the basic material, and the last two digits indicate a more precise product specification. For seamless pipes, 7304 indicates that it is made of iron or steel. The last two digits, 00, indicate that the pipe is classified as "seamless." The specific commodity codes are as follows:

7304.19.xx.xx indicates other steel pipes

Among them, "7304" indicates the code of metal pipes, and "19" indicates the sub-code of seamless pipes. In the last two digits of the sub-code, "xx" indicates the specific attributes such as specifications and materials, as shown below:

01 indicates that the outer diameter is less than or equal to 114.3mm.

02 indicates that the outer diameter is greater than 114.3mm and less than or equal to 219.1mm.

03 indicates that the outer diameter is greater than 219.1mm and less than or equal to 273.1mm.

04 indicates that the outer diameter is greater than 273.1mm.

05 indicates other seamless pipes.

 

Therefore, seamless pipes of different specifications and materials have different commodity codes, and they need to be selected and purchased according to actual conditions.

Types of Seamless Pipe

There are two types of seamless pipe; cold drawn and hot rolled. Cold drawn seamless pipe is made by drawing hot rolled steel through a die that has been shaped to match the desired pipe profile. This process increases the dimensional accuracy of the pipe, as well as improving its mechanical properties. Hot rolled seamless pipe is formed by rolling a hot steel bar along a mandrel, which gives it a round cross sectional shape. 

Advantages and disadvantages of seamless pipe
Seamless pipe has several advantages over other forms of pipe. As previously mentioned, it has greater pressure integrity due to its lack of weld seams. It also has a higher tensile strength, so it can be used in applications that require high pressures. Additionally, some forms of seamless pipe have improved corrosion resistance, making them suitable for long-term storage or installation in harsh environments. 

On the other hand, seamless pipe also has some drawbacks. Firstly, it is much more expensive to produce than welded pipe, due to the additional manufacturing processes involved. Secondly, it is heavier than welded pipe and therefore more difficult to transport and install. Finally, its dimensional accuracy can be compromised if the material is not heated and cooled correctly. 

Application of seamless pipes

1. Petroleum industry

Seamless pipes are widely used in petroleum industries such as oil wells and tubings, which can effectively ensure the quality and safety of oil.

 

2. Chemical industry

As the main material of chemical equipment, seamless pipes can withstand harsh conditions such as high temperature and high pressure, ensuring the stability and efficiency of chemical production.

 

3. Metallurgical industry

Seamless pipes are used as pipes for high-pressure boilers, which can withstand harsh conditions such as high temperature and high pressure, ensuring the safety and stability of metallurgical equipment.

 

4. Aviation field

Seamless pipes are widely used in aerospace engines, aerospace vehicles and other fields to ensure flight safety and reliability.

How to select the right seamless pipe
When selecting seamless pipe for an application, it is important to consider its intended purpose. For example, if you are looking to install a pipeline in a coastal environment, you may want to select corrosion-resistant stainless steel pipe. Alternatively, if you need a pipe with high pressure integrity, you may opt for chrome molybdenum steel pipe. Finally, when selecting the correct dimension, ensure that you pay attention to its wall thickness, outside diameter, and internal diameter. 

Conclusion of seamless pipe

Seamless pipe is one of the most widely used forms of pipe in industries such as oil and gas, petrochemical processing, and construction. It is highly valued for its superior strength and pressure integrity, as well as its resistance to corrosion. The HS Code for seamless pipe is 7304 and covers both hot rolled and cold drawn pipe. When selecting the correct type of seamless pipe for an application, it is important to consider both its intended purpose and its technical specifications.

Read more：General technical conditions for large diameter seamless steel pipes