44results about How to "Less scale" patented technology

The invention discloses a continuous unidirectional solidification preparation method of a high-purity oxygen-free copper rod. The preparation method comprises the following steps of: firstly roasting cathode copper with the purity of 99.99% for 2-4 hours in a heat preserving furnace with the temperature of 200 degrees centigrade to be fully degassed, secondly placing the cathode copper into a smelting pot in a vacuum unidirectional solidification furnace, smelting at 1250-1350 degrees centigrade, performing heat preservation for 20-30min, and casting by the continuous unidirectional solidification furnace. The vacuum degree of the continuous unidirectional solidification furnace is in the range from 0.01 to 1Pa, the casting speed is in the range from 10 to 150mm / min, the cooling water consumption is in the range from 200 to 1000L / h, the cooling water temperature is in the range from 20 to 25 degrees centigrade, and the high-purity oxygen-free copper rod with the diameter of 6-18mm is prepared. The high-purity oxygen-free copper rod is characterized in that the oxygen content is less than 4ppm, the single crystal structure or the continuous column crystal structure along a length direction is present, the conductivity, mechanical property and processing performance is excellent, the finished product ratio is high and the production cost is low.

The invention relates to an offline or online integral quenching / tempering thermal treatment production line for a standard steel rail and a profiled steel rail, which is structurally characterized by comprising a chassis, an upper compression roller support, electromagnetic induction heaters, a steel rail, upper compression rollers, an upper compression roller adjusting device, lower pinch rollers, an air and water injection device, an infrared thermodetector, a bearing block, a frequency conversion and speed regulation speed reducer, a charging end and discharging end live-roll table 12 anda tempering induction heater. The invention has the advantage that the steel rail can not deflect when moving in the middle. Frequency conversion and speed regulation are adopted by a driving / driven roller set and the pinch roller. A plurality of pairs of pinch rolls are formed by using the upper compression rollers and the lower pinch rollers to forcibly pinch the steel rail to limit the deformation of the steel rail; the height of the upper compression rollers can be regulated; the shifting speed required by a heating and spray quenching process is satisfied by adopting the frequency conversion and the speed regulation speed, and two electromagnetic induction heaters are arranged to heat the steel rail to reach the process temperature. The infrared thermodetector can monitor the heatingfinal temperature of the steel rail, the temperature of the steel rail can be stabilized in the temperature range of the quenching process, and the heating temperature is even.

The invention provides a rolling method of a titanium steel composite board. The rolling method comprises the following steps of: 1, selecting the titanium steel composite board provided with a titanium plate as an upper layer and a steel plate as a lower layer; 2, pre-treating a surface; 3, heating and soaking in a heating furnace; and 4, rolling on a hot mill, and removing scale and cooling by utilizing high-pressure water. According to different physical characteristics of the titanium plate and the steel plate under the high-temperature state, through setting the proper heating and soaking processes, and adopting the high pressure water to remove the scale and cool in the rolling process, an oxide skin on the surface of the titanium steel composite board is greatly reduced, and sundries on the surface of the titanium steel composite board are eliminated, meanwhile, the titanium plate and the steel plate are cooled at different water flows, so that the deformation degree of the titanium plate corresponds to the deformation degree of the steel plate, head buckle or unwarp phenomenon of the titanium steel composite board in the rolling process can be effectively prevented, and damage about a roller is greatly reduced; and the titanium steel composite board, rolled by the invention, has the advantages of clean and tidy surface, no foreign matters to press and good plate cut.