Method for manufacturing large cake forgings of high-carbon and high-chromium cold working die steel
A cold work die steel, high carbon and high chromium technology, applied in metal processing equipment and other directions, can solve the problems of low yield, longitudinal cracks at the surface drum, high rejection rate of large cake forgings, and achieve uniform composition and reduced Side drum shape, easy to measure and control the effect
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[0030] Example 1:
[0031] A method for manufacturing large-scale cake forgings of high-carbon and high-chromium cold work die steel includes the following steps:
[0032] a. Smelting: using electric furnace primary smelting, ladle refining and vacuum degassing process, the composition and mass percentage of the obtained steel are C 1.50%, Mn≤0.60%, Si ≤0.40%, P≤0.030%, S0.008 %, Cr 12.10%, Mo 0.53%, V 0.21%, the balance is iron; cast into 6t octagonal ingots after tapping;
[0033] b. Forging cake blank: send 6 t octagonal ingots to 4500MN press at a temperature of ≥300℃ for forging to a size of 300~500mm in diameter. After annealing, polishing or polishing, and local grinding to remove surface defects, ultrasonic waves The flaw detection is qualified, and then the end face is cold-saw cut into a cake blank;
[0034] c. Forging cake forgings: using the aforementioned turning cake blanks, reheating to 1150℃~1190℃, upsetting forging with a 4500MN press, and finally annealing and turni...
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[0038] Example 2:
[0039] A method for manufacturing large-scale cake forgings of high-carbon and high-chromium cold work die steel includes the following steps:
[0040] a. Smelting: using electric furnace primary smelting, ladle refining and vacuum degassing process, the composition and mass percentage of the obtained steel are C 1.58%, Mn≤0.40%, Si ≤0.40%, P≤0.030%, S0.005 %, Cr 11.72%, Mo 0.75%, V 0.71%, the balance is iron; after tapping, it is poured into 9 t octagonal ingots;
[0041] b. Forging cake blank: send 9 t octagonal ingots to 4500MN press at a temperature of ≥500℃ for forging to a size of 400~600mm in diameter. After annealing, polishing or polishing, and local grinding to remove surface defects, ultrasonic waves The flaw detection is qualified, and then the end face is cold-saw cut into a cake blank;
[0042] c. Forging cake forgings: using the aforementioned turning cake blanks, reheating to 1150℃~1190℃, upsetting forging with a 4500MN press, and finally annealing...
Example Embodiment
[0046] Example 3:
[0047] A method for manufacturing large-scale cake forgings of high-carbon and high-chromium cold work die steel includes the following steps:
[0048] a. Smelting: using electric furnace primary smelting, ladle refining and vacuum degassing process, the composition and mass percentage of the obtained steel are C 1.45%, Mn≤0.60%, Si ≤0.40%, P≤0.030%, S0.003 %, Cr 12.48%, Mo 0.45%, V 0.26%, the balance is iron; after tapping, it is poured into 9 t octagonal ingot;
[0049] b. Forging cake blank: send 9 t octagonal ingots to 4500MN press at a temperature of ≥500℃ for forging to a size of 400~600mm in diameter. After annealing, polishing or polishing, and local grinding to remove surface defects, ultrasonic waves The flaw detection is qualified, and then the end face is cold-saw cut into a cake blank;
[0050] c. Forging cake forgings: using the aforementioned turning cake blanks, reheating to 1150℃~1190℃, upsetting forging with a 4500MN press, and finally annealing ...
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