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| LF2 cryogenic valve forging heat treatment process |
| Time：2015-12-10 Source： Views：3008 |
| Process parameters are: heating rate is not higher than 250 ℃ / h; Normalizing temperature 900 ℃; Quenching temperature 880 ℃, normalizing and quenching heat preservation time calculated according to 1 hour / 25 mm; Quenching when forging due to fully enter the time in the water for 30 seconds; Tempering temperature under 200 ℃, the initial temperature control temperature is not higher than 150 ℃ / h, tempering temperature 630 ℃, tempering time of heat preservation for quenching heat preservation time of 1.5 to 2 times. According to the present invention after heat treatment, through metallographic organization, forgings for tempering sorbite, uniform and organization, no obvious phenomenon of the reticular ferrite and coarse grains. Even tempered sorbite organization guarantee the tensile properties and impact properties of low temperature ascending. |
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