Material advantages and application fields of hot-rolled seamless pipes

Hot-rolled seamless pipes are a kind of seamless pipes with simple manufacturing process and low cost. It is a processing method that rolls steel billets into pipes at high temperature. It has the advantages of uniform inner and outer walls, smooth surface, pressure resistance and wear resistance. Hot-rolled seamless pipes play an important role in the steel industry with their excellent performance and wide application fields. Whether in construction, machinery manufacturing or oil and natural gas, they play an indispensable role.

Characteristics and manufacturing process of hot-rolled seamless pipes:

Hot rolled seamless pipe is a large category of seamless steel pipes, which are divided according to the production method. Hot rolling is relative to cold rolling. Cold rolling is rolling at room temperature, while hot rolling is rolling above the recrystallization temperature. Seamless steel pipe is relative to welded steel pipe. Seamless steel pipe is usually made by perforating round steel and then processing, while welded steel pipe is usually made by welding steel plates in different ways.

Hot-rolled seamless pipes are formed by heating the billet to a high temperature and then undergoing perforation, rolling and other processes. Compared with cold drawn seamless pipes, the manufacturing process of hot-rolled seamless pipes is simpler and the production efficiency is higher. The appearance of hot-rolled seamless pipes is smooth, the inner wall is precise, the size is accurate, and it has high strength and corrosion resistance.

Material advantages:

Hot-rolled seamless steel pipes have the following significant material advantages:

1. High strength: In the manufacturing process of hot-rolled seamless steel pipes, the steel is rolled at high temperature, the grains are refined, and the material is uniform, which makes the steel pipe have high strength. Therefore, hot-rolled seamless steel pipes are widely used in occasions that withstand high pressure and high temperature environments.
2. Corrosion resistance: Hot-rolled seamless pipes can choose different materials according to the requirements of the use environment, such as carbon steel, alloy steel, stainless steel, etc. Hot-rolled seamless steel pipes of different materials have excellent corrosion resistance and can be used for a long time in harsh environments.
3. Good plasticity: Hot-rolled seamless pipes have good plasticity and processing performance, and can be cold-bent, welded and processed as needed, which is convenient and fast.
4. High wear resistance: The surface of the hot-rolled seamless pipe is polished and ground through multiple processes, making its surface very smooth and highly wear-resistant.
5. High pressure resistance: Hot-rolled seamless pipes have high strength and toughness, and can withstand stress under high pressure environments, so they are widely used in high-pressure pipelines and equipment.

Material types:
The materials of hot-rolled seamless steel pipes are usually carbon steel, alloy steel and stainless steel. Carbon steel materials include 20#, 45#, Q345B, etc., alloy steel materials include 16Mn, 12CrMo, 15CrMo, etc., and stainless steel materials include 304 stainless steel, 316 stainless steel, etc.

Specifications and wall thickness:
The specifications and wall thickness of hot-rolled seamless steel pipes are varied, and are generally classified according to outer diameter and wall thickness. Common specifications for outer diameter are φ6-φ720mm, and common specifications for wall thickness are 0.5-60mm. Hot-rolled seamless steel pipes of different specifications and wall thicknesses are suitable for different fields and uses.

Mechanical properties:
The mechanical properties of hot-rolled seamless steel pipes are one of their important technical indicators. Usually including tensile strength, yield strength, elongation and other indicators. The mechanical properties of hot-rolled seamless steel pipes of different materials and specifications are also different. Users can choose the appropriate material and specifications according to their needs.

Market price:
The market price of hot-rolled seamless steel pipes is affected by many factors, such as material, specification, wall thickness, market supply and demand, etc. Generally speaking, the price of carbon steel is relatively low, and the price of stainless steel is relatively high. The prices of hot-rolled seamless steel pipes of different specifications and wall thicknesses are also different, and users can compare and choose in the market.

Application fields of hot-rolled seamless pipes:

Hot-rolled seamless pipes are widely used in various fields. The following are several typical application fields:

1. Oil and gas industry: Hot-rolled seamless pipes are widely used in oil and gas pipelines, such as oil well drill pipes, oil pipes, oil casing, downhole gas pipelines, etc. Its high strength and good corrosion resistance can ensure the safety and reliability of the pipeline and meet the requirements of oil and gas extraction and transportation.
2 Machinery manufacturing industry: Hot-rolled seamless pipes have also been widely used in the machinery manufacturing industry, such as automobile manufacturing, shipbuilding, machinery and equipment, etc. Its high strength and good plasticity can meet the use requirements of complex machinery and equipment.
3 Construction engineering: Hot-rolled seamless pipes are often used in load-bearing structures, bridges, stairs, guardrails and other parts in construction engineering. It has beautiful appearance and easy installation, which can meet the structural and decorative requirements of buildings.
4. Water supply and gas supply industry: hot-rolled seamless pipes are suitable for various water supply and gas supply systems in the fields of pipelines, compressed air, steam, etc.
5. Other fields: In addition to the above major application areas, hot-rolled seamless pipes are also widely used in chemical, electric power, metallurgy and other fields. For example, the chemical industry needs to use high temperature and corrosion resistant pipes; the power industry needs to use transmission line towers.

Conclusion:

Hot-rolled seamless pipes play an important role in the steel industry with their excellent performance and wide application fields. Its high strength, corrosion resistance, wear resistance, high pressure resistance and good plasticity make it an indispensable material for many industries. In the future, with the advancement of science and technology and the improvement of technology, hot-rolled seamless steel pipes will play an important role in more fields and promote the development of various industries.

Read more: Choosing seamless tubes: cold rolled vs. hot rolled or Carbon steel tube material and use