Thermal treatment method for mechanically sealing corrugated-sheet materials of corrugated pipe

Abstract

The invention discloses a thermal treatment method for mechanically sealing corrugated-sheet materials of a corrugated pipe. The thermal treatment steps are as follows: putting the corrugated pipe which is just made into a thermal treatment furnace, and vacuumizing the thermal treatment furnace; heating the thermal treatment furnace to 200 DEG C for 25 minutes and preserving the temperature for 30 minutes; heating the thermal treatment furnace to 350 DEG C for 35 minutes and preserving the temperature for 30 minutes; cooling the thermal treatment furnace to 300 DEG C for 10 minutes and preserving the temperature for 15 minutes; heating the thermal treatment furnace to 650 DEG C for 3 hours and preserving the temperature for 2 hours; cooling the thermal treatment furnace to 550 DEG C for 1 hour and preserving the temperature for 1 hour; heating the thermal treatment furnace to 750 DEG C for 2 hours and preserving the temperature for 1 hour; cooling the thermal treatment furnace to 600 DEG C for 1 hour and preserving the temperature for 10 hours; finally cooling to the normal temperature. The thermal treatment method disclosed by the invention has the advantages that the corrugated sheets of the corrugated pipe are necessarily subjected to thermal treatment. The treatment method is simple and easy to operate, has a good using effect, and highlights the technological progress

Description

technical field [0001] The invention relates to a material heat treatment process, in particular to a bellows mechanical seal wave plate material heat treatment method. Background technique [0002] There are many high-temperature pumps in petroleum and petrochemical refineries, and they are basically high-risk pumps. Their working pressure is 0-5MPa, temperature is 200℃-300℃, speed is not more than 6000r p m (line speed is not more than 50m / s), and the shaft diameter is 25 ~ 150mm; Leakage index: under normal work, the leakage rate is 2 ~ 3mI / h, and under high temperature, high pressure, and high speed, the leakage rate is 4 ~ 9I / h; wear index: <0.017 ~ 0.02; service life index: Under normal work, the service life is 8000~10000h, and under high temperature, high pressure, and high speed conditions, the service life is 4000~6000h; it is these mechanical pumps that work under harsh conditions that are most prone to failure, and their parts are the pump seals. Due to high ...

AI Technical Summary

Problems solved by technology

[0004] The bellows valve is welded with extremely thin (less than 0.3mm) materials. The materials used include 18-8 type austenitic stainless steel, martensitic stainless steel and hardened stainless steel (17-7pH). 18-8 type austenitic stainless steel, because the strength of 18-8 type austenitic stainless steel is low, and the strength drops more at high temperature, it is difficult to ensure low loss of elasticity at high temperature; later, 316 material was changed to bellows wave plate material , but still not meet the ideal demand, the high temperature pump will soon fail