Speaking of 65Mn heat treatment process, I believe everyone's interest must be very strong, because 65Mn heat treatment process in the daily industrial production frequency is too high, our customers often will be asked about 65Mn heat treatment process related problems.
Full annealing specification for 65Mn heat treatment process:
The annealing temperature is 790-840℃, the heat preservation is 2-3h, the furnace is cooled to 500℃, the oven is air-cooled, the hardness is 196-229HBW.
65Mn heat treatment process steel wire cold drawing intermediate annealing specification:
1) Traditional periodic spheroidizing annealing process
Return temperature 750℃, heat preservation 2h, furnace cooling to the temperature (680±10) ℃, heat preservation 3h, and then furnace cold play oh 550℃, air cooling, low production efficiency, oxidation and decarbonization rate of 22-40%, surface hardness and elasticity can not meet the requirements.
2) New process of incomplete annealing
Annealing temperature (740±10) ℃, heat preservation for 4h, furnace cold after 550℃, the oven air cooling.
Tensile strength 600-620MPa, elongation 53.5-40%, hardness 209-214HBW.
The metallographic structure is spherical pearlite + a small amount of punctate pearlite. Shorten the production cycle and save energy.
65Mn heat treatment process of cold rolled steel strip annealing process:
1) Traditional annealing process
Annealing temperature 730℃, hold for 13h, then the furnace cold hit 650℃, the oven air cooling.
2) New annealing process
Annealing temperature (860±10) ℃, insulation 45-60min, furnace cooling to (750±10) ℃, insulation 3-3.5h, after the furnace cooling to 650-660℃, the pile cold or add insulation slow cooling.
The metallographic structure meets the requirements: pearlite casting is 2.5-6 grades, which is subject to 4 grades, and the efficiency of the process is improved by 80-100%.
Specification for optimum spheroidizing annealing of 65Mn heat treatment process
760℃-30min heat preservation, and then at a cooling rate of 20℃/h to 700℃*6h furnace cooling, to obtain a complete spheroidized structure (4 grades), uniform size.
65Mn heat treatment process normalizing specification:
Normalizing temperature (810±10) ℃, air cooling.
65Mn Heat treatment process ordinary quenching, tempering specifications:
Quenching temperature (830±10) ℃, oil cooling, tempering temperature (540±10) ℃, water and oil cooling.
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