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The vacuum carburizing temperature is generally higher than that of ordinary gas carburizing. Carburizing and diffusion are often used at 920~1040 C. As shown, there are two stages: pulse ventilation, stop gas, multi-stage carburizing and diffusion. The effect is better. Vacuum carburized layer is formed faster than ordinary gas, liquid and solid carburized layer because of its high temperature, especially its clean surface and high activity. If the carburized layer needs 1 millimeters, it will take 927 hours and 1 hours at 1033 degrees Celsius, only 5 hours.
Precision steel pipe has the advantages of no oxide layer on the inner and outer walls, high pressure, no leakage, high precision, high finish, small cold bending deformation, high flatness, no cracks and so on. It is mainly used to produce pneumatic or hydraulic components. As a cylinder or an oil cylinder, it can be a seamless tube. The chemical composition of cold drawn precision steel pipe

山东大鼎钢管厂主要生产无缝钢管、高压锅炉管、合金管、专用化肥管、货架管、建筑管、精密管、45钢管、16MN钢管、40CR钢管27SIMN钢管、钢管钢管、镀锌钢管。加工钢管、齿轮管、轴承管、圆钢管。钢板、工字钢、型钢、扁钢、槽钢、螺旋管、小无缝钢管、GCR15钢管、方管、厚壁无缝钢管、高压合金管、15CRMO钢管35CRMO钢管10CRMOAI钢管、20CRMNT钢管、25CRMO>钢管12CR1MOVG钢管，钢管、不锈钢管、管材、管材，目前主要生产碳素。山东大鼎钢管厂Precision steel pipe is a high precision steel tube material after cold drawing or hot rolling. Precision steel pipes are mainly used to produce seamless or welded products such as pneumatic or hydraulic components, such as cylinders or cylinders, because of their advantages such as no oxide layer on the inner and outer walls, high pressure, no leakage, high precision and so on. No cold bending deformation, flat and no crack. Precision steel pipe has the characteristics of high dimensional accuracy, high surface finish,on the inner and outer surface of the pipe after heat treatment, The difference is that the main feature of seamless steel pipe is no welded joints, which can withstand greater pressure. The products can be rough castings or cold parts.