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High-precision cold-drawn tube solution treatment
May 23, 2018

For high-precision cold-drawn tubes, the three factors of solution treatment are temperature, holding time, and cooling rate. Precision cold-drawn tube solution treatment is as follows:

1: Make the high-precision cold-drawn tube uniform in composition and composition, which is particularly important for raw materials, because the rolling temperature and cooling rate of the hot-rolled pipe sections are different, resulting in inconsistent organizational structure. At high temperature, the atomic activities increase, the σ phase dissolves, the chemical composition tends to be uniform, and a uniform single-phase structure is obtained after rapid cooling.

2: Elimination of work hardening to facilitate continued cold processing. Through solution treatment, the twisted lattice recovers, the elongated and broken grains recrystallize, the internal stress is eliminated, the tensile strength of the steel wire decreases, and the elongation increases.

3: Restore the inherent corrosion resistance of high precision cold drawn tubes. As a result of cold processing, carbide precipitation and lattice defects make the corrosion resistance of precision cold drawn tubes drop. After the solution treatment, the corrosion resistance of the precision cold-drawn pipe restores to the best condition.

The solution temperature is mainly determined based on the chemical composition. In general, the number of types of alloy elements and high content of the alloy, the solution temperature should be increased accordingly. In particular, steels with high contents of manganese, molybdenum, nickel, and silicon can be softened only by increasing the solution temperature and fully dissolving them. However, in the case of stabilized steels, such as high-precision cold-drawn tubes, the carbides of the stabilizing elements are sufficiently dissolved in the austenite when the solution temperature is high, and precipitates at the grain boundaries in the form of Cr23C6 during the subsequent cooling, causing intergranular corrosion. . In order not to decompose or solidify the carbides (TiC and NbC) of the stabilizing element, a lower solution temperature is generally used.

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