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Stainless Steel Welded Pipes – Cost-Effective, Reliable, and Customizable
Zhejiang Wenqiang Stainless Steel Co., Ltd. is a professional stainless steel welded pipe manufacturer offering high-quality welded stainless steel pipes for structural, decorative, and fluid conveyance applications worldwide. Our stainless steel welded pipes are manufactured from precision-rolled coils using advanced TIG (GTAW), plasma, or high-frequency welding techniques, ensuring consistent weld quality and excellent surface finish.
As a leading stainless steel welded pipe factory, we produce welded stainless steel tubes in round, square, and rectangular shapes, with a full range of sizes and finishes to meet diverse customer requirements. Our stainless steel welded pipes undergo rigorous quality control, including weld integrity testing, dimensional inspection, and surface finish verification.
Whether you need stainless steel welded pipes for architectural handrails, welded stainless steel tubes for food processing equipment, or large-diameter stainless steel welded pipes for water treatment facilities, our factory-direct supply ensures competitive pricing, fast delivery, and consistent quality.
- Overview
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Core Feature
Consistent Weld Quality: Our stainless steel welded pipes are produced using automated welding with real-time monitoring, ensuring defect-free seams and consistent penetration throughout the weld length.
Wide Size Range: We manufacture stainless steel welded pipes with outer diameter from 12 mm to 3000 mm, accommodating both small-diameter tubing and large-diameter piping for various applications.
Shape Options: Available in round, square, rectangular, and special profiles, our welded stainless steel pipes can be customized to your design requirements.
Excellent Surface Finishes: Various surface treatments available for stainless steel welded pipes, including mill finish, polished (180G to 600G), brushed, mirror, and coated finishes.
Cost-Effective Solution: Stainless steel welded pipes offer excellent value compared to seamless alternatives, with production efficiency that makes them ideal for large-scale projects.
Custom Lengths: We supply welded stainless steel pipes in standard lengths up to 12 meters, or custom lengths as required for your specific installation.
Specification Parameter Table
| Parameter | Range / Options |
| Outer Diameter (Round) | 12 mm – 3000 mm |
| Wall Thickness | 0.5 mm – 30 mm (depending on diameter) |
| Square/Rectangular Sizes | 10×10 mm – 500×500 mm (custom profiles available) |
| Length | 1 m – 12 m, or custom fixed lengths |
| Manufacturing Standards | ASTM A312, A554, A778; GB/T 12770, GB/T 21832, GB/T 21833; EN 10217-7; JIS G3446 |
| Steel Grades | 304, 304L, 316L, 316Ti, 321, 310S, 317L, 2205 Duplex, 2507 Super Duplex, 201, 430 |
| Welding Process | TIG (GTAW), Plasma, Laser, High-Frequency Induction (HFI), Submerged Arc (SAW) |
| Weld Treatment | Pickled, Annealed, Cold Rolled, As-Welded |
| Testing Methods | X-ray Inspection, Ultrasonic Testing, Eddy Current Testing, Hydrostatic Testing, Flattening Test, Flare Test, Weld Macro Examination |
| Surface Finishes | Mill Finish, Pickled & Annealed, Polished (180G-600G), Brushed, Mirror, Coated |
Application fields
Our stainless steel welded pipes serve a wide range of industries:
| Industry | Application | Why Welded? |
| Construction & Architecture | Handrails, balustrades, structural supports, curtain wall mullions, decorative screens | Stainless steel welded pipes offer excellent strength-to-weight ratio and aesthetic appeal at lower cost |
| Food & Beverage Processing | Conveying lines for liquids, dairy processing equipment, brewery piping, food-grade tubing | Smooth interior surfaces of welded stainless steel pipes prevent bacterial growth and enable easy cleaning |
| Water Treatment | Desalination plant piping, wastewater treatment lines, potable water distribution | Large-diameter stainless steel welded pipes provide cost-effective corrosion resistance |
| Automotive Industry | Exhaust systems, roll cages, chassis components, fuel lines | Welded stainless steel tubes offer consistent quality and formability for complex shapes |
| Furniture Manufacturing | Chair frames, table legs, display racks, shelving systems | Decorative finishes on stainless steel welded pipes enhance product appearance |
| HVAC Systems | Air conditioning lines, ventilation ducts, heat exchanger casings | Stainless steel welded pipes provide durability and corrosion resistance in climate control systems |
| Pharmaceutical Industry | Clean room piping, purified water systems, process equipment | Sanitary-grade welded stainless steel pipes meet strict hygiene requirements |
| Petrochemical | Low-pressure process lines, utility piping, fire water systems | Cost-effective stainless steel welded pipes for non-critical applications |
| Marine Applications | Boat railings, dock structures, offshore platform handrails | Stainless steel welded pipes resist saltwater corrosion with proper grade selection |
| Renewable Energy | Solar thermal collectors, biogas plant piping, geothermal systems | Durable welded stainless steel pipes withstand environmental exposure |
Customized and wholesale services
As a flexible stainless steel welded pipe manufacturer, we offer comprehensive customization options:
Custom Manufacturing Services:
Size Customization: Any diameter, wall thickness, or profile tailored to your specificationsShape Options: Round, square, rectangular, oval, or special sectionsSurface Treatment: Specify polished (various grits), brushed, mirror, coated, or painted finishesEnd Treatment: Plain ends, beveled ends for welding, or threaded ends with couplingsHole and Slot Processing: Custom hole patterns or slots for specific applications (furniture, shelving)
Wholesale Supply Capabilities:Adequate Stock: Large inventory of common sizes in 304 and 316L grades for immediate shipmentBulk Discounts: Competitive pricing for volume orders and long-term contractsMixed Container: Combine stainless steel welded pipes with seamless pipes, fittings, and flangesOEM Service: Custom profiles and finishes for OEM customers with exclusive designs
Quality Control
Our stainless steel welded pipes undergo comprehensive quality control:
| QC Stage | Inspection Details |
| Raw Material Inspection | Verification of coil certificates; surface quality check of incoming strips |
| Slitting Control | Precision slitting ensures consistent width for welding |
| Forming & Welding Monitoring | Real-time control of welding parameters; online weld inspection |
| Weld Treatment | Post-weld annealing or pickling to restore corrosion resistance |
| Non-Destructive Testing | Eddy current testing or ultrasonic testing for weld defects |
| Mechanical Testing | Tensile, flattening, and flare tests per applicable standards |
| Dimensional Inspection | OD, wall thickness, straightness, and squareness verification |
| Surface Inspection | Visual and tactile inspection for scratches, pits, or weld bead irregularities |
| Hydrostatic Testing | Pressure testing for fluid-conveying applications |
| Final Packaging Check | Protection against transit damage |
Service Process
Our customer service process ensures smooth project execution:
Step 1: Requirements Analysis
Our team discusses your application, required sizes, quantities, and delivery timeline
We provide material recommendations based on operating conditions
Samples available for approval before production
Step 2: Quotation & Order Confirmation
Detailed quotation with specifications, pricing, and delivery terms
Proforma invoice for order confirmation
Production scheduling after deposit receipt
Step 3: Production Planning
Raw material procurement from certified mills
Production schedule alignment with your delivery requirements
Quality control plan preparation
Step 4: Manufacturing & Inspection
Production according to your specifications
In-process and final inspections with documentation
Third-party inspection coordination if required
Step 5: Packaging & Shipping
Appropriate packaging based on surface finish and shipping method
Export documentation preparation
Shipping coordination and tracking
Step 6: After-Sales Support
Installation guidance available
Quality issue handling with prompt resolution
Reorder support for ongoing projects
FAQ
Q1: When should I choose welded stainless steel pipes instead of seamless?
A1: Stainless steel welded pipes are an excellent choice for applications with operating pressures below 20 bar, where cost efficiency is important. They are widely used in structural, decorative, food processing, and water treatment applications. For high-pressure applications above 20 bar, or where the highest level of safety is required, seamless stainless steel pipes are typically specified. However, modern welding technology produces welded stainless steel pipes with weld strength factors approaching 100% of the base metal -1.
Q2: What is the difference between TIG welded and HF welded stainless steel pipes?
A2: TIG (GTAW) welding produces high-quality welds with excellent appearance and is preferred for sanitary and decorative applications where the weld may be visible. High-frequency (HF) welding is faster and more economical for standard sizes, producing a narrow weld seam that is less visible after processing. Both methods produce reliable stainless steel welded pipes when properly controlled.
Q3: What grades of stainless steel welded pipes do you offer?
A3: We offer a comprehensive range including austenitic grades (304/L, 316/L, 321, 310S), ferritic grades (430), and duplex grades (2205, 2507). The most common for general applications are 304/L and 316/L stainless steel welded pipes, offering excellent corrosion resistance and formability.
Q4: Can you provide polished stainless steel welded pipes?
A4: Yes, we offer various polishing finishes from 180 grit to 600 grit, as well as brushed and mirror finishes. Polished stainless steel welded pipes are popular for architectural, furniture, and food processing applications where appearance matters. Please specify your required finish when ordering.
Q5: What is the maximum length you can produce for stainless steel welded pipes?
A5: Our standard production length is up to 12 meters. For special requirements, we can produce longer lengths subject to transportation constraints. For large-diameter stainless steel welded pipes, length may be limited by diameter due to handling considerations.
Q6: How do you ensure weld quality in stainless steel welded pipes?
A6: We employ multiple quality measures: automated welding with parameter monitoring, online weld inspection during production, non-destructive testing (eddy current or ultrasonic), and destructive testing of samples (flattening, flare, and tensile tests). Our welding operators are certified and experienced in stainless steel welded pipe production.
Q7: What is the difference between decorative and industrial stainless steel welded pipes?
A7: Decorative stainless steel welded pipes focus on surface appearance, with polished finishes and strict control over surface imperfections. Industrial stainless steel welded pipes prioritize mechanical properties and weld integrity, with surface finish secondary. Both types can be manufactured from the same base grades, but quality requirements differ based on application.
Q8: Do you offer square and rectangular stainless steel tubes?
A8: Yes, we manufacture a full range of square and rectangular stainless steel welded tubes in various sizes and wall thicknesses. These are widely used in architectural framing, handrails, furniture, and structural applications. Custom profiles are also available.
Q9: How do you package stainless steel welded pipes for export?
A9: For polished stainless steel welded pipes, we use protective wrapping to prevent surface damage, with foam interlayers between layers. For industrial grades, steel bundling with protective end caps is standard. All packaging is designed for container loading and sea transport.
Q10: What is the typical lead time for stainless steel welded pipe orders?
A10: For standard sizes in stock, we can ship within 5-7 days. For production orders, lead time is typically 15-25 days depending on quantity and specifications. We maintain stock of common sizes in 304 and 316L grades for quick delivery.
