Welded 304 Stainless Steel Tubing

304 stainless steel welded pipe is a general-purpose stainless steel material with stronger anti-rust performance than 200 series stainless steel materials. It contains chromium and nickel elements, and can form a dense oxide film on the surface, thereby enhancing its corrosion resistance. 304 stainless steel Industrial welded pipes have a wide range of diameters, generally from 6mm to 630mm, and thicknesses between 1.2mm and 30mm.

The production process of 304 stainless steel welded pipe is simple, the production efficiency is high, the varieties and specifications are many, and the equipment capital is small, but the general compressive strength is lower than that of stainless steel seamless pipe.

• Pickling and passivation: Use nitric acid + hydrofluoric acid solution to remove the oxide scale and restore corrosion resistance.
• Polishing: Mechanical polishing or electrolytic polishing (Ra≤0.8μm) to improve aesthetics.

• Ultrasonic flaw detection (UT): Detect internal defects (such as lack of fusion).
• Penetrating test (PT): Check surface cracks.
• Hydraulic pressure test: 1.5 times the working pressure for 10 minutes, no leakage is qualified.

GNEE factory uses 304 stainless steel base material that meets ASTM A312/A269 standards, provides material certificates (Mill Test Report), ensures that the composition (such as Cr≥18%, Ni≥8%) and mechanical properties meet the standards, and uses automated welding and assembly line operations to shorten the customer supply chain cycle.

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