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Forging and heat treatment method of large size 20simn spindle

A heat treatment method and large-scale technology, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve the problems of unqualified mechanical properties, uneven deformation, insufficient deformation, etc., to achieve high production efficiency, product quality assurance, production The effect of process economy

Active Publication Date: 2021-05-07
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a large-scale 20SiMn spindle that solves the problems of uneven deformation, insufficient deformation, super-exploration clutter and coarse grain after forging, and unqualified mechanical properties in the forging process of large-scale 20SiMn spindles. Forging and heat treatment method of 20SiMn spindle

Method used

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  • Forging and heat treatment method of large size 20simn spindle
  • Forging and heat treatment method of large size 20simn spindle
  • Forging and heat treatment method of large size 20simn spindle

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Embodiment 1

[0036] Example 1: A special steel enterprise implements the present invention. Forging a 20SiMn main shaft with flanges at both ends of Ф1240mm*370mm and a shaft body of Ф780mm*5035mm, the steel ingot is first selected according to the weight of the forging billet. Because the flange specification is large, Taking into account the proportion of scrap materials at both ends, the utilization rate was set at 72%, and 36 tons of refined steel ingots were selected. The specific production process is as follows:

[0037] Step 1: Heating according to the special heating specification: first, heat the steel ingot at a temperature of 600-650°C for 3 hours at a low temperature, then raise the temperature to 700-800°C at a speed not exceeding 80°C / h for 5 hours, and then heat it up to 1200-1250°C, raised to 1200-1250°C and then lifted out of the furnace with a crane to a 5,000-ton hydraulic press to pre-press the tongs, offset the sharp corners of the tail of the ingot, and then return t...

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Abstract

The invention discloses a method for forging and heat treatment of a large-sized 20SiMn main shaft. After the steel ingot is raised to 1200°C-1250°C according to a special process, the pre-pressing tongs are carried out first, and then returned to the furnace for heat preservation. After the heat preservation is completed, two upsetting and two Pull forming, the drawing process adopts WHF method, and the reduction amount of each pass is controlled at 18% to 22%. The flange forming adopts the principle of JTS forging method, and the deformation amount reaches 7%, which ensures the reasonable and effective compaction effect; after forging Air-cooled to 350℃~400℃, and then processed by special double normalizing + tempering heat treatment process, and air-cooled after two times of normalizing; improved the coarse grain clutter and performance of forgings, and improved the large-scale 20SiMn spindle overall product quality.

Description

technical field [0001] The invention belongs to the technical field of equipment manufacturing and processing of forging and heat treatment methods of large-size main shafts, and in particular relates to a forging and heat treatment method of large-size 20SiMn main shafts produced by a hydraulic press. Background technique [0002] As a key component of hydropower generation, the 20SiMn spindle plays a vital role in the safe and efficient operation of the hydropower station, so higher requirements are put forward for its internal quality and performance. [0003] 20SiMn steel is a low-alloy structural steel. The size of the large-scale 20SiMn main shaft flange is generally about 1 meter. The position of the bolt hole of the flange plate is stressed and requires high performance. Generally, it is formed by forging a large-tonnage steel ingot, and its overall quality requirements higher. [0004] At present, common large-scale spindle forgings include hydraulic press upsettin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D9/28C21D1/78B21K1/06B21J5/00
CPCB21J5/002B21K1/06C21D1/78C21D9/28
Inventor 陈倩陈伟徐群赵彩艳李海滨郑安雄
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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