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How To Restore The Inherent Corrosion Resistance Of Stainless Steel Pipe

How to restore the inherent corrosion resistance of stainless steel Pipe

For stainless steel, the three elements of the solution treatment are temperature, holding time and cooling rate. What is the role of stainless steel Pipe solution treatment?

1: the stainless steel Pipe organization and composition of uniform, which is particularly important for raw materials, because the hot rolling pipe sections of the rolling temperature and cooling rate is not the same, resulting in inconsistent organizational structure. At high temperatures, the atomic activity increases, the σ phase dissolves, the chemical composition tends to be uniform, and the uniform single-phase structure is obtained after rapid cooling.

2: Eliminate the work hardening, in order to facilitate the cold processing. Through the solution treatment, crooked lattice recovery, elongation and crushing of grain re-crystallization, internal stress elimination, wire tensile strength decreased, elongation increased.

3: restore the inherent corrosion resistance of stainless steel Pipe. Due to cold processing caused by carbide precipitation, lattice defects, so that the corrosion resistance of stainless steel pipe decreased. After the solution treatment, the corrosion resistance of the stainless steel Pipe is restored to the best condition.

The solution temperature is mainly determined by chemical composition. In general, the alloy elements of many types, high content of the grades, the solution temperature should be increased accordingly. In particular, manganese, molybdenum, nickel, high silicon content of steel, only to improve the solution temperature, so that it is fully dissolved, in order to achieve softening effect. But stabilized steel, such as 321 stainless steel Pipe, solid solution temperature is high when the stability of the elements of the carbide dissolved in austenite, in the subsequent cooling will be in the form of Cr23C6 precipitation in the grain boundary, resulting in intergranular corrosion. In order to stabilize the carbide (TiC and NbC) does not decompose, not solid solution, generally use the lower solution temperature.