What are the forging processes for steel pipes?
The forging process of steel pipes is mainly divided into two categories: directly manufacturing seamless steel pipes through forging (plastic forming), and forging steel pipes to improve performance or forming.
Main Features
|
Process Name |
Main products/purposes |
advantage |
limitation |
Typical Applications |
|
Hot perforation |
Hot rolled seamless tube and capillary tube |
High efficiency and low cost, it is the mainstream process |
High quality requirements for the center of the billet |
Ordinary fluid pipe, structural pipe |
|
extrude |
High alloy, difficult to deform pipes |
Wide material adaptability, well organized, and high precision |
High cost, low efficiency |
Stainless steel, alloy steel, and special metal pipes |
|
Periodic rolling tube |
Large diameter thick walled pipe |
High product strength |
Slow pace, large investment |
Oil and gas transmission pipes, high-pressure boiler pipes |
|
Free forging/forging |
Extra large and thick pipe blanks/fittings |
High flexibility and maximum specifications |
High labor intensity, relying on craftsman skills |
Heavy duty containers for nuclear power and chemical industries |
|
Die forging pipe fittings |
Trips, elbows, etc |
The highest strength and the best reliability |
High mold cost, suitable for batch production |
High pressure pipelines for power plants and petrochemicals |
|
Radial forging |
High precision thick walled pipe |
Excellent performance and high dimensional accuracy |
Complex equipment with strong specificity |
Military industry, high-end machinery, bearings |
Summary
The forging process of steel pipes is a system from macroscopic forming to microscopic modification:
The first type (pipe making): represented by hot perforation and extrusion, it is the cornerstone of large-scale seamless steel pipe production.
The second type (processing): represented by die forging and radial forging, is a key technology for manufacturing high-performance, high value-added pipe fittings and special pipes.
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