Cold rolling seamless steel pipes involves transforming the martensite into seamless steel pipes before the workpiece enters the precision extrusion equipment. The rough rolling is still carried out under full martensite conditions, followed by the ultra-fast cooling system between the finishing mill and the rough mill, reducing the temperature of the hot-rolled strip to below, and then entering the finishing mill.
The nitriding treatment method for seamless steel pipes primarily involves using a nitriding furnace. The seamless steel pipes are placed on a tray and then hoisted to the bottom of the furnace using a crane. Additionally, nitriding furnaces with door lifting load-bearing design can be made, allowing for heating of wall-mounted products using lifting and hanging tools. The furnace shell is typically driven by a reduction motor and an electric automatic lifting and lowering mechanism. After the lid is closed, another clamping foot bolt ensures the seal of the nitriding furnace vacuum pump. The process begins with vacuum packaging, followed by nitrogen gas for the heat treatment and nitriding process.
无缝钢管氮化处理，是指在一定温度下，由一定物质对产品进行有机化学热处理的一种热处理方法。应用氮化炉对各种钢的机械零件、轿车曲釉、传动齿轮、摩托车刹车片、模具等进行汽体氮化热处理具有很大的实用价值。色板方面，可采用空调器铜管、铜钱、铜心线、铜棒等在维护气氛中进行明亮无空气氧化淬火。或者是真空泵N2在厚壁无缝管，短轴，各种金属材料零件上使用的无空气氧化淬火热处理方法。
Clearly, the heating temperature for the cold-rolled billets in the seamless steel tube area is lower than that for basic cold rolling, significantly reducing heating energy consumption and increasing the output of the heat treatment furnace. Lower temperatures also decrease the heating rate of hot-rolled strip steel, thereby reducing fatigue cracking and fracturing caused by internal stresses, and minimizing wear on the hot-rolled strip steel. Ultra-low temperature cold rolling can further reduce the generation of secondary zinc dust, improve the process performance of hot-rolled products, and enhance the operation rate of the pickling passivation line. Actual production verification shows that replacing traditional cold-rolled and quenching hot-rolled thin plates with hot-rolled thin plates produced by hot-rolling in the seamless steel tube area can significantly reduce production costs.
