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Stainless Steel
Seamless Solutions

Premium Seamless Pipes, Tubes, Flanges & Fittings from China – Engineered for Corrosion Resistance, High Pressure & Extreme Temperatures.

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About SMLSCO

Zhejiang Seamless Pipe Co., Ltd. (SMLSCO) is a specialized stainless steel piping systems provider with 19 years of industry experience. We began by supplying cost-effective stainless steel seamless pipes, but today, SMLSCO is much more than just pipes.

With nearly two decades of growth, we have established production centers, warehouses, and sales offices strategically located in Wenzhou and Jiaxing — positioning us at the heart of China’s steel industry and economic hubs. This strategic advantage allows us to deliver high-quality products faster and more efficiently to customers across the globe.

Our mission is to provide reliable, corrosion-resistant stainless steel solutions for industries including petrochemical, offshore, power generation, and heat exchange systems. From seamless tubes to forged flanges, every product is manufactured to meet international standards such as ASME, ASTM, and EN10216-5.

SMLSCO Factory

Our Products

High-performance stainless steel seamless pipes, tubes, flanges, and fittings — precision-engineered for durability, corrosion resistance, and compliance with global standards.

Stainless Steel Seamless Pipe

Stainless Steel Seamless Pipe

ASTM A312 / ASME SA312 | TP304/L/H, 316/L/Ti, 310S/H, 321/H, 347H

  • • Austenitic & Duplex Grades
  • • Cold Drawn & Hot Finished
  • • EN1.4301 / 1.4404 / 1.4462
Seamless Tube

Seamless Stainless Tube

ASTM A789 / A213 | S31803, S32205, S32750

  • • Super Duplex & Austenitic
  • • Bright Annealed Finish
  • • For Heat Exchangers & Boilers
Forged Flange

Forged Stainless Flange

ASME B16.5 | F310S, TP304, 316L

  • • Socket Weld & Slip-On
  • • Class 150 to 600
  • • RF / RTJ Facing
Stainless Fitting

Stainless Butt Weld Fitting

ASME B16.9 | 304/304L, 316/316L

  • • Elbows, Tees, Reducers
  • • Seamless & Welded
  • • Polished & Pickled Finish

Cast Stainless Fitting

NPT Threaded | Class 150-300

  • • 304, 316, 310S Grades
  • • Threaded & Socket Weld
  • • Tee, Elbow, Coupling

Pickling Pipe

Removes Oxide Scale & Improves Corrosion Resistance

  • • ASTM A380 Compliant
  • • For Critical Environments
  • • Ready for Welding

Polished Tubing

Ra ≤ 0.8μm | Mirror Finish

  • • For Food & Pharma
  • • ASTM A270 / A213
  • • BA & EP Finishes

Duplex Seamless Pipe

S31803 / S32205 / S32750

  • • High Strength & Corrosion Resistance
  • • Offshore & Chemical Applications
  • • NACE MR0175 Compliant
View Full Product Catalog

Why Choose SMLSCO?

We combine decades of expertise with advanced manufacturing and global logistics to deliver unmatched value.

Quality Assurance

Every pipe undergoes ultrasonic testing (UT), hydrostatic testing, and chemical analysis to meet ASTM, ASME, and EN standards.

Fast Global Delivery

Large ready stock and strategic warehouse locations in Jiaxing and Wenzhou ensure rapid dispatch and customs clearance.

Vertical Integration

From raw material sourcing to final inspection, we control every step — ensuring consistency and traceability.

Global Compliance

Prepared for export regulations including China’s 2026 steel export license requirements. Full documentation support.

Emergency Supply

Proven track record in urgent deliveries for critical industrial projects worldwide.

Trusted Partner

19 years of serving stockists, distributors, and OEMs with reliable supply chains and technical support.

Frequently Asked Questions

What standards do your products comply with?

Our seamless pipes and tubes meet ASTM A312, A789, A213, ASME SA312, SA789, and EN10216-5 standards. Flanges conform to ASME B16.5, and fittings to ASME B16.9 and B16.11.

Do you offer custom sizes and finishes?

Yes, we provide custom OD, WT, lengths, and surface finishes including pickling, polishing (BA, 2B, 2D), and mechanical polishing.

What grades do you stock?

We stock TP304/L/H, TP316/L/Ti, TP310S/H, TP321/H, TP347H, 317L, 904L, and duplex grades S31803, S32205, S32750 (EN 1.4462, 1.4539).

Can you handle urgent shipments?

Absolutely. We specialize in emergency delivery execution for time-sensitive industrial projects with expedited QC and logistics.

Get in Touch

Need a quote, technical data, or sample? Contact our team today for fast, professional support.

Contact Information

Email: info@smlspipestock.com

Phone: 86-0573-82837060

WhatsApp: +86 15757336381

WeChat: 15757336381

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