Post-rolling cooling control method for small-size high-Cr 82B wire rods

The invention relates to a post-rolling cooling control method for high-Cr (the alloy content accounts for 0.30 percent-0.35 percent) SWRH82B wire rods. The method comprises the steps that post-rolling spinning temperature, cooling speed before spinning phase change, phase-transition temperature range, phase-transition cooling speed, Stelmor roller speed, fan delivery and Jialing air distribution are combined and controlled, and production equipment is adjusted to stabilize spinning mode so that the purpose of the stable production can be achieved. The spinning temperature is controlled to range from 860 DEG C to 880 DEG C. The cooling speed before post-rolling phase-transition is controlled to range from 10.0 DEG C/s to 14.0 DEG C/s. The phase-transition temperature is controlled to range from 580 DEG C to620 DEG C. The cooling speed in a phase-transition area is controlled to range from 1.5 DEG C/s to 3.0 DEG C/s. The base speed of the inlet segment of a Stelmor roller bed is controlled to range from 0.6 m/s to1.0m/s. After the technical scheme of the post-rolling cooling control of the wire rods is applied and implemented, it can be guaranteed that high strength is achieved, and plasticity does not decrease but is improved. Moreover, the situation that as cleaning rods are cooled in a non-uniform mode, so that the local positions produce low-temperature shift tissue such as martensite is avoided, and the uniformity of the cleaning rod tissue and the mechanical performance is guaranteed.