A post-forging heat treatment process for 12cr2mo1v hydrogenation reactor forgings

A 12cr2mo1v, hydrogenation reactor technology, applied in the field of large forging process, can solve the problems of inability to eliminate the pinning effect of VC and other carbides, difficult to eliminate the phenomenon of coarse grains and mixed grains, delaying the production cycle, etc., and achieve uniform structure refinement and uniformity. Stable, finer grains, and the effect of reducing the number of normalizing times
CN108315535BActive Publication Date: 2020-03-24TONGYU HEAVY IND
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
TONGYU HEAVY IND
Publication Date
2020-03-24

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Abstract

The invention provides a heat treatment process after forging of a 12Cr2Mo1V hydrogenation reactor forged piece. The heat treatment process includes the following steps that one-time high temperaturenormalizing is performed, wherein segmented heating is adopted, the heating temperature of the first segment is 650-720 DEG C, heat preserving is performed for 0.5-2 h / 100 mm, the heating temperatureof the second segment is 250-350 DEG C, heat preserving is performed for 1-2 h / 100 mm, the heating temperature of the third segment is 1010-1030 DEG C, heat preserving is performed for 1.5-4 h / 100 mm,and then cooling is performed till temperature is 250-350 DEG C; and one-time isothermal annealing is performed, wherein temperature rises to 650-720 DEG C, heat preserving is performed for 0.5-1 h / 100 mm, temperature rises to 940-960 DEG C, heat preserving is performed for 1.5-4 h / 100 mm, cooling is performed till temperature is 650-720 DEG C, heat preserving is performed for 2-4 h / 100 mm, and cooling is performed till temperature is 250 DEG C or below. The heat treatment process after forging of the 12Cr2Mo1V hydrogenation reactor forged piece effectively eliminates structural inheritance,the coarse crystal and mixed crystal condition of the forged pieces is obviously improved, and the comprehensive performance of the forged piece is improved; and meanwhile, the normalizing frequency after forging is reduced, and the production cost is saved.
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Description

technical field

[0001] The invention relates to the technical field of large forgings, in particular to a post-forging heat treatment process for forgings of a 12Cr2Mo1V hydrogenation reactor. Background technique

[0002] In the petrochemical industry, with the improvement of processes such as hydrocracking and hydrodesulfurization, the increase in demand for light oil products, the cracking and refining of heavy crude oil, and the need to prevent air pollution, hydrofining units and hydroprocessing units have been promoted. The development and prosperity of the core equipment in the hydrogen cracking unit, and the cylinder forging is an important part of the pressure vessel. It is a forging that works for a long time under certain pressure, temperature and medium conditions, so it has high requirements for materials. In addition to the mechanical properties at room temperature, according to the different use environments and importance of the container, it is also required...

Claims

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