20钢/316L复合管固液复合制坯工艺研究

Study on Solid-Liquid Composite Billet Making Process of 20 Steel/316L Composite Pipe

摘要:

双金属复合管在石油运输行业中应用前景广阔，结合性能是考察复合管是否合格的重要指标之一。为了能在轧制成形过程中得到高品质的复合管材，在复合管制坯过程中要求实现界面处的冶金复合。以20钢和316L为原材料，基于结合温度及元素扩散情况，采用固液复合方式，并且结合界面的温度模型及通过ProCAST软件模拟，获得了外模最佳预热温度为1 050—1 100 ℃。通过现场试制界面处实现了冶金复合，在最佳温度范围既保证了固态20钢和液态316L之间能达到冶金复合，又能使元素有充分的扩散时间而增强了界面结合强度，同时又可以防止因元素过渡扩散而导致316L腐蚀性能下降。该方法为后续复合管连轧提供了优良的管坯，可实现高品质复合管的现场生产。

Abstract:

Bimetallic composite pipe has a wide range of application prospect in the petroleum transportation industry， the combination of properties is to examine whether the composite pipe is qualified as one of the important indicators. In order to obtain high-quality composite pipes in the process of rolling and forming， interfacial metallurgical composite must be realized in the process of composite billets. In this paper， based on the combination of temperature and element diffusion， 20 steel and 316L were used as raw materials to study the temperature model of the bonding interface under solid-liquid composite mode， and through the ProCAST software simulation to obtain the optimal preheating temperature of the outer mold 1 050—1 100 ℃ . The metallurgical composite was achieved through on-site trial production， and this temperature range ensures that the metallurgical composite can be achieved between solid 20 steel and liquid 316L， so that there is sufficient diffusion time for the elements to enhance the interfacial bonding strength， but also prevents the deteriorate of 316L corrosion performance due to the transitional diffusion of the elements. This method provides excellent billets for subsequent continuous rolling of composite pipes， which can realize on-site production of high-quality composite pipes.