Stainless Steel 347 Welded Pipes are stabilized austenitic stainless steel pipes manufactured according to ASTM A312 TP347 and ASME SA312 standards for high-temperature and corrosion-resistant applications. These pipes contain niobium stabilization, which prevents carbide precipitation during welding and high-temperature exposure, ensuring excellent resistance to intergranular corrosion. SS 347 ERW Pipe, UNS S34700 Welded Pipe, DIN 1.4550 SS 347 Welded Pipe, and WNR 1.4550 EFW Pipe are widely used in refineries, petrochemical plants, power generation facilities, and chemical processing systems where durability, thermal stability, and structural reliability are essential.

We supply a comprehensive range of 347 Stainless Steel Welded Pipes manufactured with strict quality control and dimensional accuracy. Our pipes are produced using advanced welding processes including ERW (Electric Resistance Welding) and EFW (Electric Fusion Welding) to ensure superior mechanical strength and corrosion resistance.

As a trusted WNR 1.4550 Welded Pipe Supplier, we focus on delivering industrial piping solutions that meet demanding service conditions while complying with international standards such as ASTM, ASME, DIN, and AISI specifications.

What Are Stainless Steel 347 Welded Pipes?

347 Stainless Steel Welded Pipes are a type of stabilized stainless steel piping manufactured using stainless steel plates or coils that are rolled and welded to form a pipe structure. These pipes are alloyed with niobium (columbium), which stabilizes the material and prevents chromium carbide precipitation during welding or high-temperature exposure.

This stabilization provides superior resistance to intergranular corrosion, which commonly occurs in conventional stainless steels exposed to temperatures between 427°C and 816°C.

Because of this property, ASTM A312 TP347 ERW Pipes are commonly used in applications involving:

• high temperature service
• corrosive industrial fluids
• welded structural systems
• thermal cycling environments

Equivalent international designations include:

• UNS S34700 Welded Pipe
• AISI 347 ERW Pipe
• DIN 1.4550 SS 347 Welded Pipe
• SUS 347 ERW Pipe
• WNR 1.4550 EFW Pipe

These standards ensure compatibility across global industrial specifications.

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