A high-temperature alloy metallurgical blade and its manufacturing method

Abstract

The invention discloses a superalloy metallurgical blade, the mass percentage (wt%) of its chemical composition is: Ni: 50-55%, Cr: 17-21%, Mo: 3.0-3.5%, Co: 0.3-0.7% , W: 2.0‑2.7%, Al: 0.3‑0.7%, Ti: 0.8‑1.2%, Nb: 5.0‑5.5%, V: 0.8‑1.2%, C≤0.05%, the balance is Fe, and Mo+Co +W>5.5%. The invention also discloses the manufacturing method of the blade as follows: vacuum induction smelting→electroslag remelting under argon protection→ingot casting→radial forging→high temperature diffusion annealing→rough machining→solution treatment→aging treatment→finishing. The material of the high-temperature alloy metallurgical blade of the present invention has the following advantages: 1. Add W element in the alloy, and Mo+Co+W>5.5%, thereby improving the high-temperature strength of the alloy; in addition, W can improve the creep resistance; 2. Adding V element in the alloy can improve the impact toughness while increasing the strength. Therefore, the high-temperature alloy metallurgical blade of the present invention can meet the high-temperature slab shearing of 600-1150°C, improve the service life of the blade and ensure the cutting quality.

Description

technical field [0001] The invention relates to a metallurgical blade for a continuous casting and rolling production line and a manufacturing method thereof. The blade is suitable for shearing strip steel slabs at a temperature of 600-1150°C. Background technique [0002] The metallurgical blade for the continuous casting and rolling production line is located between the tension leveler and the heating furnace of the production line. It is a very important equipment for the continuous casting and rolling production line. preset length. At present, the materials of the blades used in the production lines of domestic steel mills are as follows: one is the traditional hot work die steel (such as H13, HMB), which has the advantage of being cheap, but the use effect is poor, and it is prone to fatigue cracks and fractures , blunt edge, etc., the service life is short (generally less than 2 months); the material of another imported blade is nickel-based alloy, and its specific ...

AI Technical Summary

Problems solved by technology

At present, the materials of the blades used in the production lines of domestic steel mills are as follows: one is the traditional hot work die steel (such as H13, HMB), which has the advantage of being cheap, but the use effect is poor, and it is prone to fatigue cracks and fractures , blunt edge, etc., the service life is short (generally less than 2 months); the material of another imported blade is nickel-based alloy, and its specific composition (wt,%) is C≤0.08%, Cr: 17-21% , Ni: 50-55%, Co≤1.0%, Mo: 2.8-3.3%, Al: 0.3-0.7%, Ti: 0.75-1.15%, Nb: 4.75-5.5%, the balance is Fe

Because the blade bears a large impact force during shearing, and the hardness of the blade matrix is ​​relatively low, the strength is low, and the impact toughness is poor, resulting in the collapse and accumulation of the cutting edge, which makes the cutting edge blunt and causes early failure (collapse angle) ), thus reducing the service life

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