A raw material production method for equipment parts in deep sea high temperature and high pressure environment

Abstract

The invention discloses a raw material production method for equipment components under the high-temperature and high-pressure environment in deep sea. The raw material production method comprises the steps that a, a billet is taken and enters a preheated forging furnace to be heated, the forging heating insulating temperature is 850+ / -20 DEG C, the insulating time is longer than or equal to 2 h, the temperature is increased again to 1,200 DEG C, insulating is carried out for more than 4.0 h, the initial forging temperature is controlled to range from 1,150 DEG C to 1,200 DEG C, the finish forging temperature is not smaller than 900 DEG C, three times of upsetting drawing out is carried out in the cross direction, and a forged piece is cooled to the room temperature from the finish forging temperature in the furnace; b, an oxidation surface of the forged piece is removed; c, normalizing is carried out, heating is carried out to 580+ / -10 DEG C, insulating is carried out for 1.5 h, the temperature is increased to 970+ / -10 DEG C, insulating is carried out for 7.5 h, and air cooling is carried out to the room temperature; d, austenitizing and copious cooling quenching are carried out, heating is carried out to reach 580+ / -10 DEG C, insulating is carried out for 1.5 h, the temperature is increased to 940+ / -10 DEG C, insulating is carried out for 7.5 h, and quenching and water cooling are carried out; and e, high-temperature tempering is carried out, heating is carried out to 200+ / -10 DEG C, insulating is carried out for 1 h, the temperature is increased to 510+ / -10 DEG C, insulating is carried out for 1.5 h, the temperature is increased to 660+ / -8 DEG C, insulating is carried out for 4.5 h, and air cooling is carried out to the room temperature.

Description

technical field [0001] The invention relates to a raw material production method for equipment parts used in high-temperature and high-pressure environments in deep sea. Background technique [0002] Human beings are developing rapidly in the field of offshore oil and gas exploitation. As inland and offshore shallow sea resources are being exploited one after another, explorers are gradually turning their attention to the deeper deep sea. The distribution of deep sea and ultra-deep sea refers to areas with a water depth of 610 meters to 1,830 meters and deeper areas below 1,830 meters, where mining activities are carried out in deep sea and ultra-deep sea areas. Since the reserves of general oil and gas reservoirs can be exploited for more than 20 years, once a failure occurs, the maintenance cost and the impact on the environment will be huge. The key to equipment is the material. For example, the hardenability of the general heat-resistant ferritic alloy steel F22 forgin...

AI Technical Summary

Problems solved by technology

For example, the hardenability of the general heat-resistant ferritic alloy steel F22 forging material is about 200mm in diameter at most, and the strength of the forging core material test results cannot meet the requirements of yield strength 80,000psi and tensile strength 100,000psi (this requirement is for the seabed General strength requirements for material selection for forgings), and the metallographic structure of the internal and external materials is quite different, and the internal grain size is coarser than that of the external

Unable to obtain good overall overall performance

In some cases where post-weld heat treatment is required, the required strength properties cannot be guaranteed