Stainless steel seamless pipe of metal and oxygen react in the atmosphere, in the appearance will form an oxide film. However, the oxidation of the iron oxide formed on the ordinary carbon steel pipe continuously causes the corrosion to be enlarged, and as a result, the pores are formed. If stainless steel seamless tube is damaged, we can use paint or oxidation-resistant metal such as zinc, nickel and chromium plating to cover the appearance of carbon steel, but, this maintenance is a layer of maintenance film, if the maintenance layer is damaged, the steel will corrosion. The corrosion resistance of stainless steel depends on the chromium, chromium is a part of steel composition, chrome on steel combined treatment, will change the appearance of the oxide type similar to pure chromium metal surface oxide. This tightly adhered chromium-rich oxide maintains the appearance and avoids further oxidation.
Heat treatment process includes heating, insulation, cooling, etc. This is done in order to reduce the deformation of the metal forming process hardening and other deficiencies, so that the deformation of the pipe after processing to restore the performance, to improve its performance.
Now the most common heat treatment tools include electric furnace and reverberatory furnace; common control mode is automatic temperature control mode.
Different stainless steel seamless pipe fittings on the heat treatment requirements are different, and not all deformation of the tools must be heat-treated, usually the final temperature of low-carbon steel pipe fittings is not less than 723 ℃, then you can not heat treatment, if lower than this temperature or the temperature above 1000 degrees celsius should be heat treatment.