304 Stainless Steel Welded Tube
304 stainless steel welded tube remains one of the most widely specified tubular products globally due to its exceptional corrosion resistance, superior mechanical strength, excellent weldability, and clean aesthetic appeal.
- Product Introduction
Product Overview
304 stainless steel welded tube remains one of the most widely specified tubular products globally due to its exceptional corrosion resistance, superior mechanical strength, excellent weldability, and clean aesthetic appeal.
Manufactured from premium-grade 304 stainless steel strips, the production process utilizes precision roll forming combined with advanced automatic TIG welding. Following welding, the tubes undergo solution annealing, pickling, mechanical or chemical polishing, and rigorous non-destructive testing to guarantee exact dimensional tolerances, flawless surface finishes, and uniform structural integrity.
Compared to seamless alternatives, 304 welded tubes deliver exceptional cost efficiency without compromising performance across standard industrial, commercial, and structural environments.
Technical Specifications
|
Parameter |
Specification Details |
|
Material Grades |
304, 304L |
|
Executive Standards |
ASTM A249, ASTM A269, ASTM A312, ASTM A554, EN 10217-7, DIN 17457 |
|
Outside Diameter (OD) |
6 mm to 630 mm (0.24 in to 24.8 in) |
|
Wall Thickness (WT) |
0.5 mm to 20 mm (0.02 in to 0.79 in) |
|
Standard Length |
5.8m, 6m, 11.8m, 12m, or Cut-to-Length Customization |
|
Surface Finishes |
AP, BA, 180G, 240G, 320G, 400G, 600G, Mirror Polished, Hairline |
|
Forming & Welding Process |
Cold Rolled Strip + Continuous High-Frequency / TIG Welding |
|
Tube Ends |
Plain Ends, Beveled Ends, Threaded Ends, or Deburred Ends |
|
Testing & Inspection |
Positive Material Identification (PMI), Hydrostatic Testing, Eddy Current Testing, Ultrasonic Testing, Dimensional Check |
|
Quality Certification |
ISO 9001, EN 10204 3.1 Mill Test Certificate (MTC) |
Chemical Composition
|
Element |
Content Range (%) |
|
Carbon (C) |
Up to 0.08 |
|
Silicon (Si) |
Up to 1.00 |
|
Manganese (Mn) |
Up to 2.00 |
|
Phosphorus (P) |
Up to 0.045 |
|
Sulfur (S) |
Up to 0.030 |
|
Chromium (Cr) |
18.00 to 20.00 |
|
Nickel (Ni) |
8.00 to 10.50 |
|
Iron (Fe) |
Balance |
Product Features & Advantages
Superior Corrosion Resistance
Formed with an alloy composition containing approximately 18% chromium and 8% nickel, 304 stainless steel forms a passive chromium oxide surface layer that provides outstanding resistance to atmospheric oxidation, moisture, and a broad range of mild chemical environments.
Excellent Weldability
Optimized chemical properties allow for seamless integration using all standard fusion welding techniques, including TIG, MIG, and resistance welding, typically eliminating the need for post-weld heat treatment in standard operational conditions.
High Mechanical Strength & Ductility
Provides high tensile and yield strength levels while retaining excellent elongation and toughness, ensuring the material absorbs mechanical stress and withstands pressure loads reliably.
Hygienic & Smooth Surface
The non-porous, smooth surface prevents bacterial accumulation and scale formation, making it the ideal material choice for sanitary applications where cleanability is paramount.
Attractive Aesthetic Appeal
Easily polished to various architectural finishes, ranging from a standard industrial look to a high-reflectivity mirror polish, enhancing visual appeal in structural and decorative installations.
Outstanding Cost-Performance Ratio
Delivers long-term durability and low maintenance costs, offering a highly economical solution for projects requiring reliable corrosion resistance and structural strength.
Primary Industry Applications
Food Processing & Dairy Equipment
Hygienic transport of liquid foods, milk, and dairy products under strict sanitary conditions.
Beverage & Pharmaceutical Production
Contamination-free processing lines, piping systems, and cleanroom equipment.
Chemical & Petrochemical Processing
Handling mildly corrosive fluids, organic acids, and industrial solvents.
Architectural Decoration & Furniture
Modern handrails, structural framing, decorative trim, and high-end furniture components.
Heat Exchangers & Water Treatment
Efficient thermal transfer systems, desalination plants, and municipal water purification infrastructure.
Automotive & Mechanical Manufacturing
Exhaust components, structural chassis parts, and precision machinery parts.
Surface Finish Options
AP (Annealed and Pickled): Matte industrial finish with scaled oxide removed via chemical pickling; ideal for standard industrial piping where appearance is secondary.
BA (Bright Annealed): Controlled atmosphere bright-annealed surface offering a reflective finish and high corrosion resistance without secondary mechanical polishing.
No.4 / 180 Grit / 240 Grit: Mechanically polished directional brushed finishes providing clean, uniform textures widely used in commercial architecture and kitchen equipment.
320 / 400 / 600 Grit: Fine abrasive polished finishes offering smoother surfaces that reduce particulate adhesion in food and pharmaceutical processing lines.
Mirror Finish (8K): High-luster buffed surface with maximum reflectivity, engineered for architectural features, luxury interiors, and decorative hardware.
Hairline (HL): Continuous fine linear polish lines resembling strands of hair, preferred for architectural paneling, elevator interiors, and premium appliances.
Comprehensive Quality Control
Incoming Raw Material Inspection
Every batch of incoming 304 stainless steel mother coil undergoes strict verification of mill test certificates, dimensional tolerances, and visual surface checks prior to entering the production line.
In-Process Chemical & PMI Testing
Positive Material Identification spectrometers are used during production to verify that the elemental composition of the alloy meets international metallurgical standards.
Non-Destructive Testing (NDT)
Welded seams are continuously monitored and inspected using advanced Eddy Current testing equipment to detect any microscopic discontinuities or inconsistencies along the weld line.
Hydrostatic & Pressure Testing
Tubes intended for fluid and pressure conveyance undergo rigorous hydrostatic pressure testing to ensure structural leak resistance under designated operational loads.
Dimensional & Surface Verification
Precision laser measurement tools and visual inspections ensure that outer diameter, wall thickness, length, straightness, and surface finish strictly conform to customer specifications.
Standard Export Packaging & Logistics
Seaworthy Protection: All tubes are securely bundled and wrapped in heavy-duty waterproof woven plastic sheeting to prevent moisture penetration during ocean transit.
End Protection: Plastic protective caps are fitted to both ends of every tube to protect bevels and prevent internal debris accumulation.
Individual Sleeving: Optional individual plastic film sleeves or pearl cotton wrapping available for mirror-polished and high-grade decorative tubes to prevent surface scratching.
Robust Wooden Crating: Heavy-duty wooden cases or reinforced steel frames utilized for fragile thin-wall tubes, small-diameter capillary tubes, or long-distance LCL shipments.
Secure Container Loading: Bundles are systematically loaded, blocked, and braced inside standard 20-foot or 40-foot containers using heavy-duty strapping to eliminate shifting during transit.
FAQ
Hot Tags: 304 stainless steel welded tube, China 304 stainless steel welded tube manufacturers, suppliers, factory, 310 stainless pipe, 321 stainless steel, inconel 600 tubing, large diameter stainless steel pipe, s s pipe list, t304 stainless steel pipe
