Steel for supporting body of rubber core of oil blowout preventer and production method thereof

Abstract

The invention discloses high-strength, wear-resistant and corrosion-resistant steel for a rubber core supporting body of a petroleum blowout preventer and a production method of the steel. The strength, wear resistance and corrosion resistance of the steel are improved by adjusting the components of C, Si, Mn, Cr and Mo, and the steel is superior to common 25CrMo steel. The production technology process comprises electric furnace smelting, extra-furnace refining, vacuum degassing, continuous casting and rolling. After the steel for the rubber core supporting body of the petroleum blowout preventer is subjected to 980 DEG C water quenching and 690 DEG C tempering, sampling is carried out for performance detection to obtain that the tensile strength is larger than or equal to 655MPa, the yield strength is larger than or equal to 517MPa, the elongation is larger than or equal to 18%, the end surface shrinkage is larger than or equal to 50% and the hardness is 200-235HBW, and it is ensuredthat the steel for the supporting body has good comprehensive mechanical properties.

Description

technical field [0001] The invention relates to the technical field of iron and steel materials, in particular to a high-strength, wear-resistant and corrosion-resistant steel for a rubber core support body of an oil blowout preventer and a production method thereof. Background technique [0002] In recent years, land oil resources have been gradually depleted. With the deepening of offshore oil exploration and development, offshore oil drilling platforms have gradually become the mainstream development trend. The underwater blowout preventer group is the most critical equipment to ensure safe drilling. It is installed on the wellhead casing head and is the core equipment in the well control equipment. It is installed on the seabed to control the wellhead pressure and prevent blowout. It is the key link to ensure the smooth completion of subsea operations. The rubber core of blowout preventer is an important part to realize well sealing and sealing space. The reliability of ...

AI Technical Summary

Problems solved by technology

The support body produced by casting in the prior art cannot meet the increasingly stringent performance requirements of the blowout preventer due to the shortcomings of loose structure, coarse grains, and low mechanical properties. The use performance is better than that of ordinary 25CrMo round steel. A support body with uniform structure and high comprehensive mechanical properties is a very beneficial attempt

However, due to the large investment in the research and development of the improvement of the steel itself, a large number of experiments are required, and the relationship between the performance of the metal material and the composition, the aggregation state of the metal structure, and the manufacturing method lacks a unified theoretical guidance, which makes it very difficult to improve the steel itself.

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