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StainlessSteel-Solution Logo StainlessSteel-Solution

The Leader of Precision Seamless Tubing in Wenzhou Since 2000

Dedicating in Annealed Precision Seamless Tubing / Bright Annealed Seamless Tubing on A270/A269/A213/3A/ISO standards. Polished & unpolished, straightened, ovality-controlled – engineered for food, pharmaceutical, semiconductor, and biotech industries.

About Wenzhou Danduoduo Fluid Equipment Co., Ltd

Established in 2000 in Wenzhou City, Zhejiang Province, we began with a vision: to bridge the gap between Eastern manufacturing excellence and Western quality expectations. Since 2015, driven by growing customer trust, we transitioned from agency to full-scale manufacturer, becoming a recognized leader in the stainless steel industry.

Our mission is clear — to deliver stable quality, ample inventory, timely aftersales support, and competitive pricing. We believe your success is our success. When you choose our products, you're choosing more than stainless steel — you're choosing a symbol of trust, quality, and partnership.

ISO9001:2015 / CE / 3A Certified
200% Inspection on Every Shipment
Manufacturing Workshop
25+
Years of Experience
8000
Metric Tons Annual Output (Pipes & Flanges)
200
Tons Monthly Output (Precision Tubing)
500
Tons Raw Material Stocked Year-Round
7M
USD Annual Turnover

Our Premium Stainless Steel Products

Engineered for precision, durability, and compliance with international standards. Ideal for food, pharmaceutical, semiconductor, beverage, and cosmetic industries.

Precision Seamless Tubes

Precision Seamless Tubes

Annealed & Bright Annealed, A270/A269/A213/3A/ISO compliant. Polished/unpolished, straightened, ovality-controlled.

  • • OD: 6mm – 219mm
  • • Wall: 0.5mm – 20mm
  • • Length: Up to 12m
  • • Materials: 304, 304L, 316, 316L, 316Ti
Sanitary Ball Valves

Sanitary Ball Valves

Tri-clamp, weld, or threaded ends. Full port design for low pressure drop. Ideal for hygienic applications.

  • • Size: 1/2" – 4"
  • • Pressure: PN16 / 150 PSI
  • • Temp: -20°C to 200°C
  • • Standards: 3A, FDA, EHEDG
Ultra Thick Wall Pipes

Ultra Thick Wall Seamless Pipes

High-pressure applications. Cold-drawn for superior dimensional accuracy and surface finish.

  • • Wall Thickness: Up to 20mm
  • • Max Pressure: 5000 PSI
  • • Applications: Condensers, Heat Exchangers
  • • Certifications: ISO, CE
Sanitary Butterfly Valves

Sanitary Butterfly Valves

Compact design, low torque operation. EPDM, Silicone, or PTFE seals. Easy to clean and maintain.

  • • Size: 1" – 12"
  • • Actuated or Manual
  • • Hygienic Design
  • • Compliant with 3A & FDA
Cold Drawn Precision Pipes

Cold Drawn Precision Pipes

High dimensional accuracy, excellent surface finish. Used in instrumentation and hydraulic systems.

  • • Tolerance: ±0.05mm
  • • Surface Roughness: Ra ≤ 0.8μm
  • • Straightness: ≤1mm/m
  • • Materials: 304, 316L
Sanitary Flanges

Sanitary Flanges

Tri-clamp, DIN, SMS, ISO, RJT standards. Leak-proof sealing for hygienic pipelines.

  • • Size: 1/2" – 12"
  • • Finish: Mirror Polished (Ra ≤ 0.4μm)
  • • Materials: 304, 316L
  • • Pressure: PN10 – PN40
Sanitary Fittings

Sanitary Fittings

Elbows, tees, reducers, caps. Designed for smooth flow and easy cleaning in sterile environments.

  • • Standards: 3A, SMS, ISO, DIN
  • • Finish: Electropolished
  • • Connection: Clamp, Weld, Thread
  • • Materials: 304, 316L
Seamless Pipes for Condensers

Seamless Pipes for Condensers

High thermal conductivity, corrosion resistance. Ideal for power plants and refrigeration systems.

  • • OD: 10mm – 219mm
  • • Wall: 1.0mm – 15mm
  • • Length: Up to 12m
  • • Standards: ASTM A269, A213

Why Choose StainlessSteel-Solution?

2-3 Days Lead Time

Fast delivery for standard sizes and specifications. We keep 500 tons of raw materials in stock year-round.

OEM Without MOQ

Flexible OEM services with no minimum order quantity. Ideal for startups and trial orders.

200% Quality Inspection

100% in-house QC + 100% third-party inspection. Every shipment is guaranteed defect-free.

Fumigation-Free Packaging

Environmentally safe, export-ready packaging. No ISPM-15 compliance issues.

2-Year After-Sales Service

We stand behind our products. Quality issues resolved within 8 jet lag hours.

4-Hour Response Guarantee

All inquiries answered within 4 hours (Beijing time). Fast, professional communication.

Industries We Serve

Food & Beverage Pharmaceutical Biological Cosmetic Semiconductor Filtration Systems Condensers

Get in Touch with Our Team

For quotes, technical support, or OEM inquiries, contact us directly. We respond to all messages within 4 hours (Beijing time).

Contact Information

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