Spiral steel pipe quenching is a financial or fixed pipe rolling mill reduction machine (if the rolling mill machine shall be cut off tube machine placed in position and reducing cabin tubes and fixed effects) after rolling steel, water quenched through online apparatus for rapid cooling (spray or immersion), the steel pipe from the heat to cool down and get fast martensite process. After hardening of the pipe line and then furnace heated to a temperature less than 4J, holding time, and in an appropriate manner cooled to room temperature, tempered sorbite finally obtained. Line quenching of primary task is to control rolling and finish rolling temperature deformation, so that after rolling finer austenite grains, as obtained after quenching martensite small foundation. Japanese high line quenching process is a deformation by rolling and heat treatment line combination, i.e. by deformation during the rolling distribution, the final rolling temperature control, control of intermediate cooling and with on-line control of the heat treatment temperature.
In tandem with spiral steel pipe production line quenching process online, you must be configured in reducing mill machine detached or detached after the machine and fixed reducing mill as one, both detached underway fixed reducing effect. This is because the spiral steel pipe after quenching and tempering temperature, which is lower than 720 nor even tempering Ni (generally high tempering temperature at 500-650 ℃, except for very special cases), fixed at this temperature for reducing, mill load deformation resistance is very large bureau, and it also causes greater stress and bending steel. So that it must be quenched and tempered steel completed before the thermal deformation (including heat-reducing). Spiral steel pipe line quenching process' buckle must pay attention to the flow of water within the flow rate. Water is too small, not quenching, tempering ferritic volume increased, resulting in low yield, only large enough amount of water to quench sake of martensite. If the flow rate is low, then the tube is easy to bend, and the resulting water-side and water-side performance are quite different. Taking into account the safety of production, ease of maintenance and production rhythm and other factors, spiral pipe line quenching media is currently using only water. To prevent bending of the quenching process, production planning arrangements in its double length preferably not more than twice the foot, usually only a single double length, the small size of the pipe even more so.
