With the rapid development of China's oil industry, the demand for high-grade steel is growing, and high-grade steel must be quenched, and therefore the study of the overall hardening of steel is very important. The latest developed a "dip in the jet quenching + + spin" and "outside the inner jet shower + + spin" two processes.

Immersion quenching process route is: quenching furnace heating pipe arrives gauge mounted on a lifting device → rotating device clamping device quickly pressed steel support wheel drive → around rapidly rotating steel cylinder lift the steel frame beam drive fast → immersion quenching in water spray nozzle within the internal steel pipe jet → quenching end, within the spray stop → about lifting cylinder will rise steel frame beam → Scroll to stop at the stop feeding device by root feeding device will turn to empty the water pipe bracket → Empty water installations will rise to lift one end of the pipe were further compressed air to dry quenching water → water → stepping conveyor pipe inside the pipe gradually transported to the discharge pipe rollers → complete quenching. This immersion quenching quenching unit for the first time using the "dip in the jet quenching + rotation +" new technology for large diameter, thick-walled tube overall quenching solve the large diameter thick-walled pipe bend quenching, quenching impervious technical problems; achieved the following significant results: (1) due to the overall level of the water pipe, high-speed rotation, multi-point auxiliary support, so that greatly improved straightness of steel, less than 2 mm / m, to meet the requirements of the product. (2) using a mobile rotation within the spray nozzle, reducing the head pipe ovality conducive pipe sizing. (3) With Move within quenching quenching process more flexible, more uniform mechanical properties of steel, quenched martensite transformation rate of over 90%, even up to 95%, the hardness of steel full length and thickness direction error of ≤3 HRC.

"Inside outside shower spray + + spin" quenching process for thin wall thickness of the pipe. Steel quenching furnace heated to about 1000 ℃, the feed roller to the position to be expected, feeding device lift steel flip it onto a slow rotating device rotating wheel support, pressure mounted on the spray rack quickly pressed steel gripping means, rotating means rapidly rotating driven rapidly rotating steel pipe, steel pipe is located above the surface of the outer tube uniform leaching water to the outer pipe, while the spray means installed in the steel pipe ends to the pipe wall spray. So that the inner and outer surfaces of the steel pipe have been given a uniform quenching.