Forging and heat treatment method of large size 20simn spindle

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...

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