Welded Tubes
Outside Diameter6.0–88.9 mm
Wall Thickness0.3–2.0 mm
Forming, longitudinal welding, sizing, annealing and finishing for industrial tube applications.
Stainless Steel Welded Tubes →
GAOFA TECH · Tube Manufacturer & Supplier
Welded & Seamless Tube Manufacturing
GAOFA TECH manufactures and supplies stainless steel, titanium and nickel alloy tubes for industrial heating, heat exchange and corrosion-resistant applications. Our capabilities cover welded and seamless production, tube finishing, coiled forms and selected enhanced heat transfer designs.
About GAOFA TECH →
Production Capabilities
Welded & Seamless Tube Range
Tube production covers specified dimensions, tolerances, delivery conditions and surface requirements, with material and processing routes matched to the tube specification.
Seamless Tubes
Outside Diameter2–630 mm
Wall Thickness0.2–50 mm
Tube blank preparation, cold drawing or cold rolling, heat treatment and precision finishing.
Stainless Steel Seamless Tubes →Available diameter and wall thickness combinations vary by material, tube form and delivery condition.
Welded Tube Manufacturing
Stainless Steel Welded Tube Process
From strip forming and welding to annealing, online dimensional control and final inspection, the production sequence supports the specified tube condition.
- 01
Material Feeding & Forming
Material receipt → strip loading → tube forming.
- 02
Welding & Cooling
Longitudinal welding → cooling → internal weld bead flattening where required.
- 03
Sizing & Annealing
First sizing → annealing → cooling → second sizing.
- 04
Online Inspection & Marking
Online eddy current testing → laser diameter measurement → online marking.
- 05
Cutting & End Finishing
Cutting to specified length → tube end trimming.
- 06
Final Testing & Inspection
Eddy current / ultrasonic testing → water-tightness / pneumatic testing → manual inspection, according to the agreed inspection scope.
- 07
Packing
Finished tubes packed for delivery.
Online Production Control
Eddy current testing, laser diameter measurement and marking are integrated into the welded tube sequence.
Welded Tube Specifications →Seamless Tube Manufacturing
Stainless Steel Seamless Tube Process
The stainless steel route combines billet and tube blank preparation, cold working, heat treatment and finishing, followed by specification-based inspection.
- 01
Billet Preparation
Round bar → incoming re-inspection → peeling → cutting → centering.
- 02
Heating & Piercing
Heating → piercing to produce the hollow tube blank.
- 03
Blank Preparation
Pickling → end facing → inspection and grinding.
- 04
Cold Drawing / Cold Rolling
Cold drawing or cold rolling → degreasing → heat treatment.
- 05
Straightening & Cutting
Straightening → tube cutting → pickling. Intermediate processing is repeated where required by the manufacturing route.
- 06
Testing & Surface Inspection
Physical and chemical testing → non-destructive testing → hydrostatic testing → surface inspection, according to the agreed inspection scope.
- 07
Marking & Dispatch
Identification → packing and storage → dispatch.
Cold Working & Finishing
Cold drawing and cold rolling routes are followed by the required heat treatment, straightening, cutting and surface preparation.
Seamless Tube Specifications →Finishing & Quality Control
Tube Surface, Dimensions & Inspection
Finishing and inspection cover the tube surface, dimensions and applicable testing requirements, with product protection carried through to packing.
Specification-Based Inspection
Dimensional and surface inspection, material verification and applicable non-destructive or pressure testing are arranged to the agreed specification. Inspection examples and testing videos are available on our dedicated quality control page.
Processing & Development
Custom Tube Development
We review drawings and samples for application-specific tube requirements, covering manufacturing feasibility, dimensions, surface condition and delivery form.
Dimensions & Cut Lengths
Specified outside diameter, wall thickness, tolerance, straightness and cut-to-length requirements.
Coiled Tube Forms
Coiled tube requirements reviewed against material, tube size, coil geometry and delivery format.
Enhanced Tube Geometry
Drawing and sample review for inner grooves, low fins and selected enhanced heat transfer designs.
Material Development
Material alternative assessment for the application, including ESHR-03 heating element tubes for selected projects.
Tube processing and reel delivery.
Packing & Delivery
Product Protection for Export Delivery
Packing is arranged around the tube dimensions, surface condition and delivery requirements, with protection for handling and transport.
- Protected bundles and wooden cases
- Tube end and surface protection as specified
- Product identification and packing inspection
- Order-related inspection and shipment documents
Manufacturing FAQ
Tube Production & Supply Questions
What materials does GAOFA TECH manufacture and supply?
Our tube range covers stainless steel, titanium and nickel alloys, including Incoloy, Inconel and Hastelloy, in welded, seamless, coiled and selected enhanced heat transfer tube forms.
What is your welded tube size range?
The welded tube range is OD 6.0–88.9 mm and wall thickness 0.3–2.0 mm. Available size combinations, tolerances and delivery conditions vary by material and tube form.
What is your seamless tube size range?
The seamless tube range is OD 2–630 mm and wall thickness 0.2–50 mm. Available size combinations and processing routes vary by material, tube form and specification.
What does the stainless steel welded tube process include?
The process includes strip loading, forming, welding, cooling, internal weld bead flattening where required, two sizing stages with annealing between them, online inspection and marking, fixed-length cutting, end trimming, final testing, manual inspection and packing.
How are your stainless steel seamless tubes produced?
The route includes round bar preparation, heating and piercing, tube blank preparation, cold drawing or cold rolling, heat treatment, straightening, cutting, pickling, inspection, marking and packing. Intermediate processing can be repeated according to the manufacturing route.
Can you support custom tube development?
Yes. We review drawings and samples for special dimensions, tolerances, surface requirements, groove or fin geometry and material alternatives. Development and manufacturing feasibility are assessed for the specific tube design.
What inspection support is available?
Inspection support covers dimensions, surface condition, material verification and applicable non-destructive or pressure testing. The method and scope follow the product specification and agreed order requirements. Inspection examples and videos are available on our Quality Control page.
What tube forms and packing options are available?
Our range includes straight lengths, cut-to-length tubes, coiled tubes and selected enhanced tube designs. Packing options include protected bundles, wooden cases, tube end protection and surface protection according to the product and delivery requirements.
Tube Manufacturing & Quotation Support
Specification review and quotations for stainless steel, titanium and nickel alloy tubes, including welded, seamless, coiled and selected enhanced tube designs.