​What are the surface treatment methods for stainless steel welded pipes?

Stainless steel welded pipes are mainly used in industrial transportation pipelines and mechanical structural components such as petroleum, chemical industry, medical treatment, food, light industry, mechanical instrumentation, etc. This article introduces to you what are the surface treatment methods of stainless steel welded pipes?

1. The wall thickness of pickled stainless steel welded pipes with welds is uniform, and its pressure-bearing capacity is relatively strong. However, the polished stainless steel welded pipes will become thinner in wall thickness after manual polishing, especially at the welds. Generally, the thicker the wall at the welds, the thicker the wall. The thinner it is, the smaller its pressure-bearing capacity is.

2. Pickled stainless steel welded pipes with welds ensure the performance of austenitic stainless steel pipes. Most stainless steel welded pipes use austenitic stainless steel as raw material and are non-magnetic or weakly magnetic. However, polished stainless steel welded pipes will cause fluctuations in chemical composition after polishing, making austenitic stainless steel magnetic.

3. Stainless steel welded pipes have strong corrosion resistance after weld pickling. Polished stainless steel welded pipes remove the passivation layer formed after pickling of raw materials, making polished stainless steel welded pipes prone to rust in normal environments and weakening their corrosion resistance.

stainless steel welded pipe

4. The quality of pickled stainless steel welded pipes with welds is more stable. Polished stainless steel welded pipe requires polishing to cover up spatter, heavy skin, and dented spots on the surface of the material. Even stainless steel welded pipes will be spliced with multiple longitudinal and transverse welds. The quality of the raw materials for this polished stainless steel welded pipe cannot be guaranteed, nor can the quality of the stainless steel welded pipe itself.

5. Pickled stainless steel welded pipes with welds are more practical. Industrial welded pipes mainly utilize the mechanical properties, corrosion properties or pipeline properties of stainless steel welded pipes. Except for decorative welded pipes and sanitary welded pipes, the surface gloss of stainless steel welded pipes is lower. Therefore, it is not necessary to use polished stainless steel welded pipes with high cost and unstable performance for industrial stainless steel welded pipes.