A Forging Method for Improving the Yield of Nickel-based Corrosion-resistant Alloy Forging Billets

Abstract

A forging method of the present invention for improving the yield of nickel-based corrosion-resistant alloy forging blanks is a direct radial forging process composed of radial forging heating and radial forging deformation fire sequence control forging, through the change of forging fire sequence, from the original rapid forging The multi-fire process of billet + radial forging has been transformed into a single-fire radial forging process. Using the four working flat anvils of the radial forging machine to deform the billet at the same time, the steel ingot is used for direct diameter forging. The entire production cycle is one week. 50% faster. Reduced fast forging and fast forging grinding after blanking, the total heating time is 21 hours, reducing more than 10 hours, reducing energy consumption, reducing labor intensity, and the finished product rate is between 81%-83%, which improves the nearly 3%.

Description

technical field [0001] The invention relates to the fields of iron and steel metallurgy and metal processing, in particular to a forging method applied to nickel-based corrosion-resistant alloys and capable of improving the yield of forged blanks. Background technique [0002] The Cr content in the nickel-based corrosion-resistant alloy is as high as 30%. Because the nickel-based corrosion-resistant alloy has excellent intergranular stress corrosion resistance, cold and hot processing performance, structural stability and welding performance, it has become a key component in the preparation of nuclear power steam generators Among them, the nickel-based corrosion-resistant alloy heat transfer tube of the nuclear power steam generator is the key core component for the heat exchange of the primary and secondary circuits in the nuclear island. If damaged, radioactive substances may leak to the outside world, causing serious impact. Therefore, nickel-based corrosion-resistant all...

AI Technical Summary

Problems solved by technology

[0013] The overall requirement of the above method is direct quick forging blanking + radial forging, but because the fast forging machine is a free forging machine, the entire deformation process is not uniform, so cracks often appear after forging and need to be ground, which delays the normal delivery cycle. Generally, the delivery period of forging is within one week, and 6 electroslag ingots are one heat, but in fact, the delivery time of the whole process is two to three weeks, and the yield of finished products has also dropped significantly. It is estimated that fast forging + intermediate grinding, Without cutting the head and tail, the yield rate is 95% to 97%, while forging, cutting the head and tail, the yield rate is 81% to 83%, and the overall yield is 78% to 80%.

[0014] To sum up, there are many times of forging in the whole process, it is difficult to connect the equipment for quick forging billet opening and radial forging, and there are often problems such as equipment waiting for materials for a long time, increasing the difficulty of production arrangement, etc., which not only increases energy consumption, but also reduces Reduced production efficiency and equipment utilization, seriously affected cost reduction and improved production efficiency,