Post-forging heat treatment method for large forgings of hot wall hydrogenation reactor

Abstract

The invention discloses a post-forging thermal treatment method for a heavy forging of a hot-wall hydrogenation reactor. The method is used for performing post-forging thermal treatment on the heavy forging, which is made of 12Cr2Mo1 and is 1,500-4,500 millimeters in outer diameter and 100-300 millimeters in wall thickness, of the hot-wall hydrogenation reactor. The post-forging thermal treatment method is characterized by comprising the following steps: I, controlling the final forging temperature, performing air cooling until the surface temperature of a forging is 250-350 DEG C, and feeding the forging into a heating furnace; II, raising the temperature of the heating furnace to 600-700 DEG C at a speed of less than or equal to 80 DEG C per hour, and preserving heat; III, raising the temperature of the heating furnace to 880-930 DEG C at the maximum power of the heating furnace, and preserving heat; IV, discharging a workpiece, and cooling the workpiece in water until the surface temperature of the workpiece is lower than or equal to 80 DEG C; V, feeding the workpiece into the heating furnace for later use, raising the cavity temperature of the heating furnace to 650-720 DEG C at a speed of less than or equal to 80 DEG C per hour, preserving heat, discharging and performing air cooling. By adopting the post-forging thermal treatment method, the performance is preserved in a post-forging thermal treatment process while the quality of the forging is ensured, the production period of the forging of the hot-wall hydrogenation reactor is effectively shortened, and the cost is reduced.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a post-forging heat treatment method for a large forging of a hot wall hydrogenation reactor. Background technique [0002] The hot wall hydrogenation reactor is a major key equipment in the modern petrochemical industry. This equipment is mainly used in petroleum refining or heavy oil hydrocracking, hydrofining, catalytic reforming, desulfurization, and heavy metal removal processes. The working temperature of the hot wall hydrogenation reactor is generally above 400°C, the working pressure is about 20MPa, and the contact medium is oil gas, hydrogen, hydrogen sulfide and other corrosive media. The technical level and safety requirements of the hydrogen reactor are extremely high. [0003] 12Cr2Mo1 is a common material for manufacturing hot-wall hydrogenation reactors. The outer diameter of the hot-wall hydrogenation reactor is 1500-4500 mm, and the wall thickness is 100-300 mm. At pre...

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Problems solved by technology

[0007] According to the above process, hydrogenation reactor forgings with stable quality can be obtained. The disadvantage is that two heat treatment processes, post-forging heat treatment and performance heat treatment, are required, and the production cycle is longer and the manufacturing cost is higher.

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