Black steel seamless pipe

Black steel seamless tubes, also known as carbon steel seamless tubes, are mainly made of carbon steel (an iron-carbon alloy). The carbon content is usually between 0.04% and 2.1%. The black color is due to the iron oxide coating formed during the manufacturing process of carbon steel pipes, which gives them a dark flaky appearance. This type of steel pipe features excellent strength and corrosion resistance, and is widely used in industries such as manufacturing, construction, and energy.

Main features:

The black oxide layer on the surface: The black oxide layer on the surface is formed during the manufacturing process of the steel pipe and can serve as a protective barrier, providing a certain degree of anti-corrosion ability.
2. Weld-free structure: Seamless pipes are manufactured through hot rolling or cold drawing processes, eliminating the presence of welds and enhancing the overall strength and sealing performance of the steel pipes.
3. Multiple sizes and specifications: Due to the ductility of carbon steel materials, the outer diameter of black steel seamless pipes ranges from approximately 10mm to 1000mm, the wall thickness from 2mm to 90mm, and the length can reach up to 12 meters, meeting different engineering requirements.
4. High strength and pressure resistance: Based on seamless structure, black steel seamless pipes can withstand high pressure and high temperature, making them suitable for harsh working environments.

Common thicknesses include Sch40 / Sch80 or other thicknesses

Execution standards and certifications:
ASTM A53: Applicable to seamless and welded steel pipes.
ASTM A106: Seamless carbon steel tubes for high-temperature services.
API 5L: Steel pipes for oil and gas transmission pipelines.
ASME B36.10M: Standard for Welded and Seamless steel tubes.
ISO 9001: Quality Management System Certification.

The performance of black steel seamless pipes

Strength and durability: Black steel pipes are widely favored for their high strength and excellent durability, and can handle harsh working conditions such as water supply, gas transmission, and various structural supports.

Corrosion resistance: The iron oxide layer formed during the production process can serve as a protective barrier, providing a certain degree of corrosion resistance. Beyond the basic iron oxide layer, protective coatings such as epoxy and polyurethane can also be applied, or galvanizing and thermal spraying treatments can be carried out to further enhance the pipe's wear resistance and anti-aging capabilities.

Excellent weldability
Black seamless steel pipes have excellent welding performance. Whether it is argon arc welding, manual arc welding or automated welding, they can achieve firm and airtight joints, which is convenient for on-site installation and equipment manufacturing.

Excellent cost performance
Compared with materials such as stainless steel and copper pipes, black steel pipes have more advantages in unit cost. Moreover, considering their service life and maintenance costs, they often bring higher comprehensive economic benefits to engineering projects.

High-temperature resistance characteristic
This pipe material can maintain stable mechanical properties in high-temperature environments and is widely used in boilers, heat exchangers and other industrial applications with strict requirements for heat resistance.

Application field:

Water supply system
With its outstanding strength, durability and corrosion resistance, black seamless steel pipes are widely used in urban and industrial water supply networks to ensure water quality safety and long-term stable operation.

Natural gas pipeline
Its sturdy pipe wall structure makes it an ideal pipe material for transporting natural gas and other flammable gases, capable of withstanding high pressure and ensuring the safety of gas transmission.

Building structure support
In construction projects, black seamless steel pipes are often used in load-bearing components such as columns, beams, and trusses, providing reliable structural support for various large and high-rise buildings.

All kinds of industrial processes
In industrial sites such as chemical engineering, pharmaceuticals, and power, this type of steel pipe is used to transport various process fluids, compressed air, and gaseous media, meeting the demands of harsh working conditions such as high temperature, high pressure, and corrosion.

Petroleum and natural gas exploration and processing
In the process of oil and gas extraction and refining, black seamless steel pipes, as pipelines for crude oil, natural gas and refined oil products, play a crucial role in pressure-bearing, safety and durability.

Advantages:
It has high structural strength and is suitable for high-pressure environments.
Good corrosion resistance and long service life.
High dimensional accuracy, suitable for precision engineering.

Disadvantage:
The black oxide layer on the surface may fall off during long-term use and requires regular maintenance.
Compared with welded steel pipes, the manufacturing cost is higher.