Stainless steel seamless pipes are manufactured and processed using several key methods to ensure high strength, corrosion resistance, and precision dimensions. Here are the main processing techniques:
A heated stainless steel billet is forced through a die using a press to form a hollow pipe.
Suitable for large-diameter and thick-walled pipes.
Provides good mechanical properties but requires further finishing.
A stainless steel hollow billet (pierced bar) is drawn through a die at room temperature to reduce diameter and improve surface finish.
Enhances dimensional accuracy and surface smoothness.
Used for high-precision applications (e.g., hydraulic systems, instrumentation).
A specialized cold-rolling process that reduces wall thickness and diameter incrementally.
Produces high-strength, seamless pipes with tight tolerances.
Commonly used for nuclear, aerospace, and high-pressure applications.
A heated round billet is pierced by a mandrel to create a hollow shell (hollow billet).
The first step in seamless pipe production before further cold/hot processing.
Similar to cold drawing but uses rollers to reduce thickness and improve surface quality.
Ideal for thin-walled, high-precision stainless steel pipes.
Relieves internal stresses and improves ductility after cold working.
Enhances corrosion resistance by restoring the passive oxide layer.
Pickling & Passivation – Removes oxide layers and improves corrosion resistance.
Polishing – Enhances surface smoothness for aesthetic or sanitary applications (e.g., food, medical).
Straightening – Ensures dimensional accuracy and straightness.
Oil & gas pipelines
Chemical processing equipment
Boiler & heat exchanger tubes
Aerospace & automotive components
Hydraulic and precision instrumentation systems
Stainless Steel Pipes
Cherry
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