Industrial Stainless Steel Tubing

Shuangsen supplies Industrial Stainless Steel Tubing from China factory direct. Smooth internal bore prevents scaling and reduces fluid resistance, supporting flow rates up to 30 m/s. Sanitary construction with no impurity precipitation. Materials: 304, 304L, 316, 316L. Used in printing and dyeing equipment, drinking water systems, medical gas distribution, hot water, and seawater pipelines. ISO 13485 certified.

Fluid dynamics and flow performance characteristics

Industrial Stainless Steel Tubing is engineered for fluid conveyance applications where flow efficiency and long-term reliability are priorities. The internal surface finish minimizes frictional resistance, allowing flow rates up to 30 m/s without excessive pressure drop. The smooth bore also prevents scale accumulation and sediment buildup, maintaining consistent flow performance over extended service periods.

Material selection includes 304, 304L, 316, and 316L – each grade chosen based on the fluid being conveyed. 304 and 304L are suited for potable water, medical gases, and air systems. 316 and 316L provide enhanced corrosion resistance for seawater, chemical solutions, and high-temperature water applications. The tubing is produced with solid solution treatment and internal mechanical polishing, followed by surface finishing options including pickling or bright 180# to 600# polishing.

Fluid handling advantages

• Smooth internal bore – minimizes scaling and sediment adhesion
• Flow capacity – supports velocities up to 30 m/s
• Low fluid resistance – reduces pumping energy requirements
• Sanitary construction – no impurity precipitation into the fluid stream
• Corrosion resistance – material grades matched to fluid chemistry

• Scale-free operation – reduces maintenance intervals and cleaning frequency

Dimensional range and tolerance specifications

Standard OD range from 19.0mm (3/4") to 165.2mm (6½"). Wall thickness options from 0.89mm to 3.05mm. Custom dimensions are produced to drawing specifications.

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

Surface treatment and corrosion protection

Internal surface mechanical polishing creates a smooth finish that resists particle adhesion and biofilm formation. This is critical for drinking water, medical gas, and food processing applications where fluid purity is required. External surface options include pickling (removes oxide scale and restores passive layer) or bright 180# to 600# polishing (provides aesthetic finish and additional corrosion resistance).

Solid solution treatment is applied to all tubing. This heat treatment process dissolves carbides and homogenizes the microstructure, maximizing corrosion resistance and ductility. The combination of solution treatment and surface finishing ensures the tubing performs reliably in aggressive fluid environments including seawater, chemical solutions, and high-temperature water systems.

Surface finish options

• Internal mechanical polishing – smooth, scale-free surface
• External pickling – removes scale, restores passive layer
• External bright polishing – 180# to 600# grit finish
• Solid solution treatment – applied to all lengths
• Passivation – optional for enhanced corrosion resistance

Inspection and quality verification

Each batch of Industrial Stainless Steel Tubing is inspected using the following methods:

• Mouth opening test – confirms internal surface quality
• Flattening test – detects weld seam integrity
• Bending test – verifies formability and ductility
• Hydrostatic pressure test – 2.45MPa (25kg) leak test
• Eddy current flaw detection – screens for surface and subsurface defects

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, 316, 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

Fluid conveyance applications

This tubing is specified for fluid handling across multiple industrial sectors:

• Printing and dyeing equipment – dye and chemical solution conveyance
• Drinking water systems – potable water distribution
• Medical gas distribution – oxygen, nitrogen, and compressed air
• Hot water systems – heating loops and domestic hot water
• Seawater systems – marine and coastal water handling
• Industrial fluid transfer – process fluids, coolants, and chemicals

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 Industrial Stainless Steel Tubing 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 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 maximum flow velocity supported?
The tubing can withstand flow rates up to 30 m/s without significant pressure drop or erosion.

Why this tubing is selected for industrial fluid handling

• Smooth internal bore – prevents scaling, reduces maintenance
• Flow capacity – supports up to 30 m/s fluid velocity
• Material grades 304, 304L, 316, 316L – matched to fluid chemistry
• Solid solution treatment – maximizes corrosion resistance
• Internal mechanical polishing – Ra ≤ 0.2 µm
• In-house NDT and testing – accelerates batch release
• Non-standard sizes – no minimum batch restrictions
• Full documentation – supports audits and compliance

Shuangsen Pipe Industry – National High-Tech Enterprise. Building a world-renowned Chinese pipeline brand. Every tube, from 19mm to 165mm OD, reflects 25 years of continuous process refinement and strict quality discipline.