Stainless Steel Condenser Tube

Shuangsen supplies Stainless Steel Condenser Tube from China factory direct. Raw material is AOD-refined 304, 304L, or 316L coil from TISCO and Zhangpu. Pure hydrogen shielded welding produces straight, full weld seams with high strength. Online annealing solid solution treatment follows welding. Internal mechanical polishing achieves Ra≤0.2µm, smooth and trace-free. 1000h salt spray testing shows no surface corrosion. Used in condensers, coolers, radiators, and heat exchangers across chemical, petrochemical, power, pharmaceutical, and food industries.

Metallurgical foundation and welding environment

Manufacturing of Stainless Steel Condenser Tube begins with AOD-refined steel from TISCO and Zhangpu. The AOD (Argon Oxygen Decarburization) refining process produces steel with tightly controlled chemistry – low carbon, controlled inclusion content, and consistent alloy distribution. This metallurgical consistency is critical for condenser tube applications where uniform corrosion resistance and predictable thermal conductivity are required.

Pure hydrogen shielding gas is used during the welding process. Hydrogen provides an oxygen-free atmosphere that prevents weld pool oxidation and produces a clean, full weld bead with no porosity or undercut. The weld zone is straight and fully penetrated – no filler metal is used, so the seam composition matches the base alloy. After welding, the tube passes through an online annealing solid solution treatment that homogenizes the weld microstructure and fully restores corrosion resistance.

Material and welding parameters

• Material grades: 304, 304L, 316L – AOD-refined coils from TISCO/Zhangpu
• Weld shielding: pure hydrogen atmosphere – prevents oxidation
• Weld characteristics: straight, full bead, no porosity or undercut
• Post-weld treatment: online annealing solid solution – homogenizes weld zone
• Internal finish: mechanical polishing – Ra ≤ 0.2µm, smooth and trace-free
• External finish options: pickling, bright 180# to 600#
• Corrosion resistance: 1000h salt spray test – no surface corrosion

Dimensional range and heat transfer applications

Standard OD range from 19.0mm (3/4") to 165.2mm (6½"). Wall thickness options from 0.89mm to 3.05mm. The smooth internal surface minimizes fouling and maintains heat transfer efficiency over extended service periods.

Tolerances follow JIS G3447 or ASTM A269/A270. Lengths typically -0/+10mm.

Testing and quality verification

Each batch of Stainless Steel Condenser Tube undergoes the following inspection sequence:

• Transverse and longitudinal pressure leveling – confirms ductility and weld soundness
• Reverse flattening – detects weld seam separation or lamination
• Hydrostatic test or eddy current flaw detection – screens for pinholes and linear defects
• Mechanical property verification – tensile strength, yield point, and elongation
• Inner surface roughness measurement – Ra and Rz values per ASTM B912

Traceability is maintained from coil heat number through forming, welding, and finishing. Factory test reports are issued per batch. Third-party inspection (SGS, BV) can be engaged at the production site.

Order specification checklist

1. Product designation
2. Material grade (304, 304L, 316L)
3. Dimensions and tolerance class
4. Quantity (pieces or total length)
5. Packing method (bundles, crates, or custom)
6. Heat treatment condition
7. Testing method (hydrostatic, eddy current, etc.)
8. External surface finish (pickling, bright 180#~600#)
9. Internal wall roughness requirement (Ra, Rz)
10. Special marking or end protection

Condenser and heat transfer applications

This tubing is specified for heat transfer equipment across multiple industrial sectors:

• Power generation – surface condensers, turbine exhaust condensers
• Chemical processing – condensers, coolers, reboilers
• Petroleum refining – overhead condensers, product coolers
• Pharmaceutical manufacturing – sterile condensers and heat transfer equipment
• Food processing – condensers in evaporation and distillation
• HVAC and refrigeration – condenser coils, radiators, cooling towers

Compliance standards and certifications

Certifications held: ISO 9001:2015, ISO 14001:2015, ISO 45001:2018, ISO 13485:2016. National designations: "Specialized, Refined, Unique and New" Little Giant Enterprise and National High-Tech Enterprise.

Frequently asked operational questions

Can the Stainless Steel Condenser Tube be produced to non-standard dimensions?
Yes. Custom production covers special OD, wall thickness, length, tighter tolerances, special surface finishes (pickling, bright 180#~600#), OEM marking, and specific end preparations.

Is this a manufacturer or a trading operation?
Direct manufacturer. The facility operates 133 welded pipe lines and performs all key processes in-house.

Are samples available and what is the cost?
Samples are provided free of charge. The receiver covers freight. Lead time: 5–10 working days.

Can the factory be visited or inspected remotely?
On-site visits and online video walkthroughs are available. Real-time quality data can be shared.

What quality assurance procedures are in place?
Three inspection stages: incoming coil verification, in-process checks, and final inspection including NDT, mechanical tests, surface roughness, and dimensional audit.

What is the typical delivery lead time?
Stock items: 3–10 days. Made-to-order: 25–45 days. Large orders: 50–60 days.

How is shipping arranged?
Long-term freight forwarders provide competitive rates. Delivery terms: FOB Ningbo/Shanghai, CIF, or EXW.

What surface finishes can be supplied?
External: pickling, bright 180#, 320#, 400#, 600#. Internal: mechanical polished (Ra ≤ 0.2 µm) or pickled.

Is full traceability maintained?
Each coil is assigned a unique heat number. Full traceability to raw material certificate is maintained.

What is the corrosion resistance performance?
1000h salt spray testing shows no surface corrosion. The AOD-refined material and pure hydrogen welding process contribute to superior corrosion resistance in condenser service.

Why this tubing is selected for condenser applications

• AOD-refined 304/304L/316L coils from TISCO and Zhangpu – mill certificates provided
• Pure hydrogen shielded welding – clean, full weld bead with no oxidation
• Online annealing solid solution – no separate batch annealing required
• Internal mechanical polishing – Ra ≤ 0.2µm, smooth and trace-free
• 1000h salt spray resistance – proven corrosion performance
• In-house NDT and testing – accelerates batch release
• Non-standard sizes – no minimum batch restrictions
• Full documentation – supports audits and compliance