Why are high-frequency tube mills not suitable for stainless steel pipes? HF tube mills use high-frequency welding, which doesn't suit stainless steel well. It can affect the weld quality, surface finish, and corrosion resistance.

1.Material Properties Don’t Match the Welding Method

HF welding uses induction heating, which is ideal for magnetic materials like carbon steel.

High-frequency (HF) welding generates heat through induced current at the edges of the strip, melting the metal locally and forming a weld under pressure.

However, austenitic stainless steel is non-magnetic and has lower electrical conductivity than carbon steel.

This leads to low induction efficiency, insufficient heating, and a higher risk of cold welds or poor fusion.

2.Unstable Weld Quality

Stainless steel conducts heat poorly, making it prone to burn-through or incomplete penetration. Its low thermal conductivity means it doesn’t dissipate heat quickly.

Since HF welding delivers concentrated heat, this can cause overheating, weld collapse, or even intergranular corrosion.

Poor weld appearance and finish.

HF welding typically produces wider weld seams with more burrs, which require additional grinding.

Stainless steel products are often used in decorative, medical, or food-grade applications, where surface quality matters — HF welding doesn’t meet these standards.

3.Weakened Corrosion Resistance

The HF welding process can damage the protective passive layer on stainless steel surfaces.

If the heat is not properly controlled, it may cause accelerated corrosion at the weld, including intergranular corrosion.

For medical, food-grade, or high-end decorative stainless steel tubing, such weld quality is unacceptable.

If you’re producing stainless steel pipes — especially for industries with high demands — TIG (argon arc welding) or laser welding is a more reliable and precise solution.

Tell us your needs — we’ll help you find the best setup.

KINGTECH TUBE MILL CO. LTD.                                                                                       

Email: fsyxh4@tubemakingmachine.com

Whatsapp: +86 13336483052