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Forging Control Method for Uniformly Refining the Grain Size of Forgings

A control method and grain size technology, which are applied in the field of steel material manufacturing process control, can solve the problems of ultrasonic detection clutter, low mechanical properties, and reduce production costs, and achieve economical production processes, high mechanical performance indicators, and long service life. Effect

Active Publication Date: 2021-05-07
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to use a special forging control method to solve the problem of coarse grains and mixed crystals in large forgings without increasing production costs, to obtain uniform and fine internal structures, and to improve the impact energy of products. Control the forging process and return to the furnace heating method to improve the forging control method of large forging grain size uniform refinement of forging grain size, this method greatly improves the pass rate of large forging grain size, and then solves ultrasonic detection clutter and mechanical properties Low-level problems, this method also greatly reduces production costs, this method is not only suitable for CrNi2MoV, CrNi3MoV, CrNi4MoV and other types of steels that are prone to coarse grains and mixed crystals, but also for other types of steel large forging products

Method used

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  • Forging Control Method for Uniformly Refining the Grain Size of Forgings

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Embodiment Construction

[0018] Take 4330V steel as an example for analysis. A 12.5T electroslag ingot is selected to forge a forging with a size of 570mm×650mm×3250mm.

[0019] Step 1), first, heat the electroslag ingot before forging, and keep it in a high-temperature furnace at 1200°C for 8 hours.

[0020] Step 2), during the first fire forging, the height of the electroslag ingot is upset to 900mm, and then the elongation forging is carried out. After the elongation reaches 800mm×1000mm, the edge is chamfered, and the forging is air-cooled to 650±10°C (with a larger The temperature measured at the center of the surface shall prevail), and put it into a heating furnace at 1200 ° C for 3 hours.

[0021] Step 3), during the second fire forging, first upsetting the height of the intermediate billet to 900mm, drawing it to 800mm×1000mm, chamfering, and air cooling the forging to 650±10°C (based on the temperature measurement at the center of the large surface) , into a 1050 ° C heating furnace for 2 ...

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Abstract

The invention relates to a forging control method for uniformly refining the grain size of forgings. For the forging process of large forgings, a special forging control and furnace heating method are adopted to make the temperature of the surface and core of the forging tend to be consistent, so that the structure of the core of the forging is completely Transformation, to achieve uniform refinement of the internal structure of large forgings, adopt high temperature heating before forging, after the first fire upsetting and elongation forging, air cool the forgings to a certain temperature, so that the temperature of the inner and outer surfaces of the forgings tends to be consistent, and then return to the high temperature furnace for heating; After the second fire upsetting and drawing, the forging is air-cooled to a certain temperature, and after the temperature of the inner and outer surfaces of the forging tends to be consistent, it is heated in a low-temperature furnace; Without increasing production costs, the internal structure of large forgings is evenly refined, which solves the problem of coarse grains and mixed crystals in large forgings, greatly reduces production costs and shortens the production cycle. Forgings have high mechanical properties and long service life. Production The process is more economical and scientific.

Description

technical field [0001] The invention belongs to the field of iron and steel material manufacturing process control, in particular to a forging control method for uniformly refining the grain size of forgings. Background technique [0002] The forging of large forgings usually requires upsetting, elongation, and multi-fire forging. After each fire forging, the core temperature of large forgings is still high, and the billet is directly returned to the high-temperature furnace for heating, resulting in long-term high temperature in the core. state, the internal structure cannot be fully transformed, so the core structure of the forging is coarse, and the whole forging is coarse grained and mixed grained. [0003] At present, the problem of coarse grains and mixed grains has always been a major problem in the production of large forgings, especially for CrNi2MoV, CrNi3MoV, CrNi4MoV steels, this problem is more prominent. Coarse and uneven grain size not only affects the ultras...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D1/26
CPCC21D1/26C21D8/005
Inventor 叶玉娟高全德
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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