Hygienic Stainless Steel Tube

Shuangsen manufactures and supplies Hygienic Stainless Steel Tube directly from China factory. Weld path is straight without shadow. Full nitrogen protection welding and pure hydrogen annealing produce high weld strength. Mechanical properties: tensile ≥690MPa, expansion rate >30%. Tube expansion, shrinking, bending, and flattening tests show no rupture. 1000h salt spray testing confirms no surface corrosion. Material options: 201, 304, 316L. Surface finishes: bright 180#–400# or mirror 400#–800#. Used in hardware, bathroom equipment, and sanitary applications.

Welding process and mechanical integrity

Hygienic Stainless Steel Tube is manufactured using full nitrogen protection welding combined with pure hydrogen annealing. The nitrogen shielding atmosphere prevents oxidation during welding, producing a clean, full weld bead that is straight and free of shadow. Pure hydrogen annealing follows the welding process, restoring the metallurgical structure and corrosion resistance of the weld zone. This two-step process ensures the weld seam matches the base metal in strength and ductility.

Mechanical testing verifies performance: tensile strength ≥690MPa, expansion rate >30%. Tube expansion, shrinking, bending, and flattening tests show no rupture, confirming the reprocessing capability of the tubing. This allows the tube to be bent, expanded, or formed during installation without weld seam failure. 1000h salt spray testing shows no surface corrosion, confirming the corrosion resistance of both the base material and the weld zone.

Mechanical properties and corrosion resistance

• Tensile strength – ≥690 MPa
• Expansion rate – >30%
• Expansion test – no rupture
• Shrinking test – no rupture
• Bending test – no rupture
• Flattening test – no rupture
• Salt spray test – 1000h, no surface corrosion
• Weld path – straight, without shadow

Dimensional range and surface finish options

Standard OD range and wall thickness combinations. Surface finish options: bright sanded (180#–400#) or mirror polished (400#–800#) for sanitary and decorative applications.

Custom dimensions available upon request. Tolerances follow JIS G3447 or ASTM A269/A270.

Quality verification and mechanical testing

Each batch of Hygienic Stainless Steel Tube is subject to the following inspection sequence:

• Expanding test – verifies ductility and weld integrity
• Shrinking test – confirms formability
• Bending test – validates flexibility without rupture
• Flattening test – detects weld seam weakness
• Mechanical property test – tensile strength and elongation

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.

Order specification checklist

1. Product name
2. Material grade (201, 304, 316L)
3. Dimensions and OD tolerance
4. Quantity
5. Surface polishing: sanded (180#–400#) or mirror (400#–800#)
6. Actual thickness requirement
7. Packing method
8. Special requirements

Hardware, bathroom, and sanitary applications

This tubing is specified for applications requiring both corrosion resistance and aesthetic surface finish:

• Bathroom equipment – towel rails, shower columns, handrails
• Hardware products – furniture components, decorative tubing
• Sanitary fittings – faucet components, pipe connectors
• Architectural applications – railings, balustrades
• Food equipment – processing line components

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 Hygienic Stainless Steel Tube be produced to non-standard dimensions?
Yes. Custom production covers special OD, wall thickness, length, tighter tolerances, and specific surface finish requirements.

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 expanding, shrinking, bending, flattening, and mechanical property tests.

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 are available?
Sanded: 180#–400# bright finish. Mirror: 400#–800# high gloss. Special finishes available upon request.

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

What is the service temperature for this tubing?
Intermittent service up to 815°C, continuous service up to 675°C. Heat treatment: bell furnace annealing at 860°C ± 10°C.

Why this tubing is selected for sanitary and hardware applications

• Full nitrogen welding + pure hydrogen annealing – high weld integrity
• Tensile ≥690MPa, expansion >30% – excellent reprocessing capability
• 1000h salt spray test – no surface corrosion
• Material grades 201, 304, 316L – options for different corrosion requirements
• In-house quality control – reduces external dependency
• Non-standard sizes – no minimum batch restrictions
• Full documentation – supports audits and compliance