Stainless steel welded pipe stainless steel material is more corrosion resistant than other materials, 316L stainless steel welded pipe is more corrosion resistant than 304 stainless steel welded pipe.
The thickness of 3PE reinforced anti-corrosion national standard stainless steel welded pipe is 2.5 ~ 3.7mm. The thickness of 3PE anti-corrosion stainless steel welded pipe of the same specification is generally +0.5. The coating has good temperature resistance, and can be used in the environment of -40 ℃ ~ 300 ℃. Used for a long time. No burning and softening will occur; the strength is high, and the test pressure can reach 5.5Mpa at room temperature; the fluid resistance is small, the pipeline does not scale, and the transmission efficiency is improved; the acid, alkali and salt corrosion, the pipeline will not rust within 50 years.
There are many ways to choose stainless steel welded pipe. They can be connected by threaded connection, flange connection and groove connection, bimetal welding connection, underground pipeline welding, plastic coated stainless steel welded pipe can be perfectly welded by plastic coating welding technology. Plastic coated stainless steel welded pipes inside and outside are widely used in the construction industry water supply and drainage systems, HVAC circulating water systems, petroleum, chemical pipelines, fire sprinkler systems, natural gas, natural gas transportation and other fields.
The stainless steel welded pipe causes the acceleration of oxidation on the weld and on both the inside and outside of the weld. Because there are discolored areas where oxidation can be seen, the color is related to the thickness of the oxide layer. Compared with the oxide layer on the surface of the stainless steel plate before welding, the oxide layer in the discolored area is relatively thick, and the composition is changed (chromium is reduced), so that the local corrosion resistance is reduced. For the inside of stainless steel high-frequency welded pipes, oxidation and discoloration can be minimized by using an appropriate backflush method. After the stainless steel welded pipe is welded and formed, it is often necessary to perform post-weld treatments such as pickling and grinding to remove the oxide layer (colored) and restore corrosion resistance. A color chart is often used to determine whether the weld needs to be pickled according to the color level. However, this decision is subjective. In principle, each color indicates the presence of oxidation and the affected oxide layer, so the corrosion resistance of the stainless steel high-frequency welded pipe is reduced.