Post-forging heat treatment process for 45Cr4NiMoV alloy steel large back-up rolls of rolling mills
A technology of alloy steel and backup roll, applied in the field of heat treatment of large forgings, can solve the problems of slow cooling of the core, insufficient austenite transformation, insufficient grain refinement of the backup roll, etc.
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[0047] The large backup roll refers to a backup roll with a roll body diameter greater than or equal to φ1500mm.
[0048] The embodiments of the present invention are given to illustrate the present invention, but do not constitute any limitation to the present invention.
[0049] The manufacturing process of the large back-up roll: material preparation—rough smelting—ladle refining—vacuum ingot casting—forging—post-forging heat treatment (high temperature normalizing + low temperature normalizing + spheroidizing annealing + high temperature tempering, Air cooling)—rough machining—ultrasonic flaw detection—preparatory heat treatment (quenching + high temperature tempering)—semi-finishing—ultrasonic flaw detection—packaging.
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[0050] Example: 45Cr4NiMoV alloy steel large backup roll post-forging heat treatment process
[0051] The specifications of the support roller are: the diameter of the roller body is φ1750
[0052] The heat treatment process for large backup rolls of 45Cr4NiMoV alloy steel in rolling mills includes post-forging heat treatment process, preliminary heat treatment, and final heat treatment. The post-forging heat treatment process is as follows:
[0053] (1) After forging, air-cool to 400-450°C and enter the furnace, and the temperature of the heat treatment furnace is not lower than 600°C; it is beneficial to shorten the holding time and quickly transform the austenite in the core of the blank into a pearlite structure. Fast heating speed re-austenitization for recrystallization and refinement, followed by air cooling for normalizing;
[0054] (2) High temperature normalizing + low temperature normalizing + spheroidizing annealing + high temperature tempering process, air c...
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