Manufacturing technology for improving low-temperature impact toughness of forge piece
A technology of low temperature impact toughness and manufacturing process, applied in the field of manufacturing process, can solve the problems of unreachable impact toughness value, large low temperature impact fluctuation of forgings, mismatch of strength, hardness and plasticity, toughness, etc., to increase the grain boundary area. , the effect of grain refinement
Active Publication Date: 2012-11-14
ZHANGJIAGANG HAIGUO HEAVY FORGING
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Problems solved by technology
[0002] For the large forgings with high low-temperature impact toughness used in pressure vessels and petrochemical equipment, when the final heat treatment is performed, many forgings meet the technical requirements for strength and hardness, but the impact toughness value often fails to meet the specified performance requirements, that is, the strength , Hardness does not match plasticity and toughness. In the actual production of forgings, the low-temperature impact of forgings often fluctuates greatly, which cannot meet the requirements.
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[0007] The manufacturing process for improving the low-temperature impact toughness of forgings according to the present invention will be further described in detail below through specific examples.
[0008] Such as figure 1 As shown, the manufacturing process for improving low-temperature impact toughness of forgings includes the following steps: heating the workpiece to 340±5°C for material, and then heating the workpiece to 750±5°C for heat preservation. The heat preservation time is related to the thickness of the workpiece In direct proportion, when the thickness of the workpiece is 1 inch, the heat preservation time is 0.5 to 1 hour. After a period of heat preservation, the workpiece is placed in the heat preservation cover to slowly cool the workpiece to 500 ° C, and then the workpiece is cooled by air cooling. Get forgings.
[0009] The above-mentioned manufacturing process for improving the low-temperature impact toughness of forgings first adopts the insulation cov...
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The invention relates to a manufacturing technology for improving the low-temperature impact toughness of a forge piece, which comprises the following steps that a workpiece is heated to 340 plus or minus 5 DEG C to be supplied, the workpiece to be supplied is heated to 750 plus or minus 5 DEG C to be thermally insulated, the thermal insulation time and the thickness of the workpiece are directly proportioned, when the thickness of the workpiece is 1 inch, the thermal insulation time is 0.5-1 hour, after thermally insulating for a while, the workpiece is put in a thermal insulation cover to be slowly cooled to 500 DEG C, and is then cooled through air cooling, so the forge piece is obtained.
Description
technical field [0001] The invention relates to a manufacturing process for improving the low-temperature impact toughness of forgings aimed at 410 steel. Background technique [0002] For the large forgings with high low-temperature impact toughness used in pressure vessels and petrochemical equipment, when the final heat treatment is performed, many forgings meet the technical requirements for strength and hardness, but the impact toughness value often fails to meet the specified performance requirements, that is, the strength 1. The hardness does not match the plasticity and toughness. In the actual production of forgings, the low-temperature impact of forgings often fluctuates greatly, which cannot meet the requirements. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a manufacturing process for improving the low-temperature impact toughness of forgings. The produced forgings can meet the technical requiremen...
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IPC IPC(8): C21D1/00
Inventor 王松林
Owner ZHANGJIAGANG HAIGUO HEAVY FORGING