Device and technology for controlling cooling after hot rolling perforation of GCr15 bearing steel pipe billets

Abstract

The invention discloses a device for controlling cooling after hot rolling perforation of GCr15 bearing steel pipe billets. The device comprises a detection device arranged on a frame, a cold water control ring for cooling bearing steel pipes, a roller bed system for conveying the bearing steel pipes and a control system for acquiring data detected by the detection device and controlling the operation of the cold water control ring; the cold water control ring comprises an outer steel ring, an inner steel ring arranged in the outer steel ring, an end panel for sealing the space between the outer steel ring and the inner steel ring, and a water inlet pipe and a water outlet pipe connected to the outer steel ring; and the inner steel ring is provided with a plurality of water outlet pin holes. In addition, the invention also provides a technology for controlling cooling after hot rolling perforation of the GCr15 bearing steel pipe billets by adopting the cooling control device. According to the device and the technology, under the condition of ensuring that cracks are not produced on the surfaces of the steel pipes, separation of netlike carbides is inhibited, shred-like sorbite tissues are obtained, the spheroidizing annealing time is shortened, the grade of the spheroidizing annealing tissues is improved, the production cost is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a supporting device for a steel pipe production process, in particular to a cooling control device and a cooling control process after hot rolling and piercing of a GCr15 bearing steel tube billet. Background technique [0002] The controlled rolling and controlled cooling of GCr15 bearing steel can be basically divided into three types of processes: high temperature controlled rolling + controlled cooling, high temperature controlled rolling + controlled cooling + isothermal controlled rolling, and low temperature controlled rolling. The isothermal controlled rolling process of bearing steel needs to add isothermal equipment to ensure a constant temperature of the rolled piece, and the power of the main motor of the rolling mill and the rigidity of the rolling mill also have high requirements, so it is still difficult to widely apply it in large-scale production. Low-temperature controlled rolling usually adopts deformation be...

AI Technical Summary

Problems solved by technology

In the past, in order to solve the problem of network carbides, low-temperature final rolling was used. Although the precipitation of network carbides was reduced, the output of the rolling mill was greatly reduced, and the subsequent spheroidizing annealing time was lengthened, which increased production costs.

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