Heat treatment process for thrust bearing shoe chromium-bronze forging piece used in steam turbine

Abstract

The invention discloses a heat treatment process of a thrust bearing chromium bronze forging used for a steam turbine, comprising a solution treatment step, a quick cooling treatment step and an agingtreatment step; wherein, the heating temperature for the solution treatment is 1000-1040 DEG C and the heating time therefore is 1.4-1.6 hours; the quick cooling treatment is water cooling treatmentwith the time of 0.45-0.55 hour; the heating temperature for the aging treatment is 420-470 DEG C and the heating time therefore is 14-16 hours. As the technical proposal of the heat treatment processof the thrust bearing chromium bronze forging used for the steam turbine, the yield strength of the thrust bearing treated by the heat treatment process achieves 300MPa, thus greatly improving the bearing capability of the part; meanwhile, according to the measurement in a running unit, the working temperature of the bearing when in use is lowered by about 10-20 DEG C, which completely meets thepractical use requirement.

Description

technical field [0001] The invention relates to a heat treatment process for a thrust bearing bush chrome bronze forging for a steam turbine. Background technique [0002] At present, the material of thrust bearing pads used in small-capacity steam turbines is low-carbon steel. The speed continues to increase. Under high-speed and heavy-load conditions, the maximum operating temperature of the bearing bushes of 300-600MW units has approached 100°C. In order to ensure the long-term safe operation of high-power generator sets, the bearing capacity of the bearing must be improved on the basis of ensuring that the original good thermal conductivity and electrical conductivity of the bearing remain unchanged. Therefore, due to its own characteristics, low-carbon steel, the material of the thrust bearing bush used in the original small-capacity steam turbine, can no longer be used in large-capacity steam turbines. Therefore, people in the industry use chrome bronze to make the th...

AI Technical Summary

Problems solved by technology

Therefore, due to its own characteristics, low-carbon steel, the material of the thrust bearing bush used in the original small-capacity steam turbine, can no longer be used in large-capacity steam turbines. Therefore, people in the industry use chrome bronze to make the thrust of large-capacity steam turbines. Bearing, according to the use conditions of the thrust bearing, heat treatment should be carried out on the thrust bearing to improve its bearing capacity and service life

However, existing enterprises that realize large-scale production still lack this type of production and processing technology.