Large alloy steel forge piece water cooling quenching tempering technology
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A technology of quenching and tempering, alloy steel, applied in the field of forging processing
Inactive Publication Date: 2020-03-24
SHANDONG IRAETA HEAVY IND
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[0011] The above-mentioned processes or methods are all methods focusing on a certain aspect, especially the control strategy for the water-cooling and quenching process
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Embodiment 1
[0088] Water-cooled quenching and tempering treatment of φ6970 / φ6360×430 ring forgings made of 42CrMo:
[0089] 1. Blanking: Select 43 tons of 42CrMo refined steel ingots for blanking, and remove nozzles and risers;
[0090] 2. Forging and forming: heating and forging the blank;
[0091] 3. Heat treatment after forging: After cooling the forging to room temperature in air, put it into a heat treatment furnace with a furnace temperature not higher than 300°C, raise the temperature to 650°C at a speed of ≤120°C / h, and keep it for 3.0h; then heat it up to 880°C, keep warm for 8.0h, and air cool to room temperature after the heat preservation is over;
[0092] 4. Rough turning: According to the shape and size of the finished forging and forging blank, the machining allowance of each part is determined to ensure that after quenching and tempering, the size of each part of the forging can meet the size requirements of the finished product;
[0093] 5. Ultrasonic testing (UT): Carr...
Embodiment 2
[0103] Ring rolling machine 5CrNiMo cone roller water cooling quenching and tempering treatment:
[0104] 1. Blanking: Select 69 tons of refined steel ingots made of 5CrNiMo;
[0105] 2. Forging and forming: heating and forging the steel ingot, eagerly cutting the nozzle and riser;
[0106] 3. Heat treatment after forging: put the forged conical roller into the heat treatment furnace when it cools down to about 650°C on the surface, and then set the furnace temperature at 650°C and keep it warm for 8.0h; Power up to 880°C, hold for 35 hours, and air-cool after leaving the furnace; when the surface temperature is about 300°C, put it into a heat treatment furnace, set the furnace temperature to 300°C, hold for 3.0h, then heat up to 650°C at ≤80°C / h, and hold 40.0h, out of the oven and air-cooled;
[0107] 4. Rough turning: According to the finished size of the tapered roller and the size of the forging after normalizing + tempering, draw the sawing lines at both ends and imple...
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Abstract
The invention belongs to the technical field of forge piece machining, and particularly relates to a large alloy steel forge piece water cooling quenching tempering technology. The provided large alloy steel forge piece water cooling quenching tempering technology comprises the following steps including discharging, forging, heat treatment after forging, rough turning, ultrasonic detection, watercooling quenching tempering, sampling detection, finish turning and final checking. A specific control scheme is provided for water cooling quenching of medium-low-carbon alloy steel, medium-high-carbon alloy steel and tool and mould steel forge pieces, the water cooling quenching crack risk is greatly reduced, and pollutant emission in the quenching process is reduced. Meanwhile, the mechanical performance of a forge piece body completely meets the technical requirement. Particularly, for the same product with the through quenching layer depth requirement, high-cooling-rate water is adopted for quenching cooling, a deeper through quenching layer can be obtained compared with adoption of organic quenching liquid and quenching oil for cooling, and accordingly tempering resistance and comprehensive mechanical performance of the forge piece are improved.
Description
technical field [0001] The invention belongs to the technical field of forging processing, and in particular relates to a water-cooling quenching and tempering process for large alloy steel forgings. Background technique [0002] Regarding the water-cooled quenching and tempering process of forgings, the following documents have disclosed: [0003] For example, CN109852775A discloses a post-forging heat treatment process for large-scale low-carbon alloy steel forgings, which includes the following steps: Step A: immediately put the low-carbon alloy steel forgings into an annealing furnace for heat preservation after being forged, and the heat preservation temperature is 590 ° C ~ 850 ° C ; Holding time is 6~20h; Step B: After step A is completed, control the annealing furnace to cool down to 200°C~300°C and maintain the furnace temperature; Step B) Control the annealing furnace to cool down at a constant speed of 2~5°C / min. Step B) holding time is 6~18h; [0004] Step C) T...
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