Carbon Steel Seamless Pipe

Product Details

The production and application of carbon steel seamless pipe play an important role in the industrial field. The following is detailed information about the manufacturing principles, processing techniques, and application areas of seamless pipes:

1. Manufacturing principle and materials:

Manufacturing principle: Seamless pipes are steel pipes that are processed from steel billets through multiple cold drawing or cold rolling processes. Compared with welded pipes, seamless pipes do not require welding and therefore have higher strength and corrosion resistance. This gives seamless pipes advantages in some areas that require higher pipe quality.

Material: The materials of seamless pipes include carbon steel, alloy steel, stainless steel, and other steel materials. These material choices depend on the specific environment and requirements in which the pipe will be used, such as applications at high temperatures, corrosive environments, or high strength requirements. 

2. Processing technology:

The production process of seamless pipes includes multiple steps, among which the key steps are as follows:

Billet heating: Heating the steel billet to the appropriate temperature for subsequent processing.

Perforation: The initial tube shape is formed on the heated steel billet by a perforation machine.

Rolling: Use a rolling mill to roll the perforated steel billet multiple times to gradually reduce the pipe diameter and increase the pipe wall thickness.

Cold drawing: The rolled tube blank is cold drawn through a cold drawing machine to further adjust the diameter and wall thickness of the tube.

Pickling: Pickling the cold-drawn pipes to remove surface oxides and improve surface quality.

Cutting and inspection: Cut the pickled pipes and conduct various inspections to ensure that the pipes meet relevant standards and quality requirements.

3. Application fields:

Seamless pipes are widely used, mainly in the following fields:

Petroleum field: used as oil well casing and tubing. It has high-temperature resistance, corrosion resistance, high strength, and other characteristics, and is suitable for complex oil well environments.

Chemical industry: Used as pipelines for transporting chemical media, which can meet high requirements for medium purity and pipeline corrosion resistance.

Machinery manufacturing field: Used as components in automobiles, machine tools, engineering machinery, and other fields, such as bearing tubes, cylinder tubes, spiral tubes, etc., and are favored for their excellent strength and wear resistance.

Quality control of seamless steel pipes is crucial to ensure their safety and reliability during use. Careful inspection and control are required at all stages of production. Here are some common control points:

a. Raw materials
Steel billet selection: Select high-quality steel billets and check whether there are defects, bubbles, or cracks on the surface.
Chemical composition testing: Carry out chemical composition analysis of raw materials to ensure compliance with standard requirements.
Mechanical property testing: Test the mechanical properties of raw materials, such as strength, toughness, etc.
b. Production process
Piercing and rolling control: During the piercing and rolling process, temperature and pressure are strictly controlled to prevent cracks and deformation.
Cold treatment control: Control the cold treatment process to ensure that the structure and performance of the product are optimized.
Tube blank cutting: Control the length of the tube blank to ensure compliance with specifications.
c. Size
Diameter and wall thickness inspection: Use measuring instruments such as micrometers, wall thickness measuring instruments, etc. to ensure that the diameter and wall thickness of the finished product meet the standard requirements.
d. Surface quality
Visual inspection: Conduct a visual inspection of the surface to ensure there are no obvious defects such as cracks or folds.
Instrument testing: Use surface quality testing instruments to check parameters such as surface roughness.
e. Metallographic structure
Microscopic observation: Observe the metallographic structure through a microscope to check whether the microstructure meets the requirements.
f. Mechanical properties
Tensile test: Use a tensile testing machine and other equipment to test the mechanical properties of the finished product, including hardness, tensile strength, yield strength, and other indicators.
Total quality control
Quality Management System: Implement a quality management system, such as ISO 9001, to ensure that the entire production process is effectively controlled.
Traceability: Maintain product traceability and record key parameters at each production stage for traceability and analysis when needed.

Our factory:

Hot Tags: carbon steel seamless pipe, China, suppliers, manufacturers, factory, customized, wholesale, bulk