Cast-rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel

Abstract

A casting and rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel, belonging to the technical field of super austenitic stainless steel preparation. The preparation process is: (1) According to the composition ratio of super austenitic stainless steel, weigh the raw materials and keep each raw material at 150-250°C for 100-150 minutes; (2) Classify each raw material and put it into vacuum induction melting step by step Furnace, smelt to obtain molten steel; (3) Under the protection of high-purity nitrogen, pour the molten steel into a double-roller thin strip casting and rolling mill for casting and rolling, where the pouring temperature is 1450~1550℃, the casting and rolling speed is 10~40m / min, and the casting The rolling force is 30-70kN, and a super austenitic stainless steel strip with a thickness of 2.0-3.0mm is obtained. In the prepared super austenitic stainless steel thin strip, the central segregation of Cr and Mo elements has been suppressed. On the premise of ensuring unchanged plasticity, the yield strength is increased by 5% to 10% compared with the strip steel of the same specification using traditional processes. At the same time, The casting and rolling method of the present invention reduces energy consumption and production costs, improves material utilization and reduces environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of super austenitic stainless steel preparation, and in particular relates to a casting and rolling method for suppressing central segregation of chromium and molybdenum elements in super austenitic stainless steel. Background technique [0002] Super austenitic stainless steel is a kind of high-alloyed stainless steel. Its thin-gauge cold-rolled sheet has a wide range of applications in harsh environments such as chemistry, pharmaceuticals, petrochemicals, and power plants. Compared with ordinary austenitic stainless steel, super austenitic stainless steel contains a large amount of alloying elements such as Cr, Ni, Mo, etc., which makes it have higher strength, toughness and plasticity, and excellent welding performance. The substantial improvement of corrosion resistance in this medium meets the needs of users for materials that can resist harsh environments, making the application range and demand for su...

AI Technical Summary

Problems solved by technology

Aiming at the serious segregation of Cr and Mo elements and the precipitation of a large number of second phases in super austenitic stainless steel, there is no efficient solution at present. The main technical means for industrial production are: increasing the solution treatment temperature and increasing the solution treatment time. The solution treatment temperature is as high as 1200°C or even higher. The solution treatment temperature is much higher than that of ordinary austenitic stainless steel. Therefore, higher requirements are placed on the capacity of the heating furnace equipment, and the material Burning loss and energy consumption reduce the utilization rate of materials and increase the bearing capacity of the environment, which is not conducive to the sustainable green development of economy and environment

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