High-strength stainless steel for deep sea cryogenic engineering and manufacturing method of steel

Abstract

The invention discloses high-strength stainless steel for deep sea cryogenic engineering and a manufacturing method of the steel, and belongs to the technical field of stainless steel. Chemical components of the stainless steel comprise, by weight percent, smaller than 0.05% of C, 12.2% to 13% of Cr, 8.0% to 8.5% of Ni, 2.1% to 2.5% of Mo, smaller than 0.3% of Al, smaller than 0.0015% of N, smaller than 0.1% of Si, smaller than 0.01% of Mn, smaller than 0.005% of P, smaller than 0.001% of S and the balance Fe and inevitable impurities. The manufacturing method comprises the steps that a vacuum induction furnace and consumable electrode vacuum furnace dual smelting technology is adopted, and after smelting, a steel ingot is subject to annealing, cogging, forging or rolling to form the steel. The steel and the method have the beneficial effects that after heat treatment is carried out, and the steel has the excellent strength and toughness matching performance and excellent salt-fog resistance performance, and is suitable for structural parts, fasteners and the like of deep sea drilling exploitation or fishing equipment.

Description

technical field [0001] The invention belongs to the technical field of stainless steel, and in particular provides a high-strength stainless steel for deep-sea low-temperature engineering and a manufacturing method thereof, which are suitable for structural parts and fasteners of deep-sea drilling or salvage equipment. Background technique [0002] The deep sea is rich in oil and gas resources, mineral resources and biological resources, which is an important strategic goal for countries to compete for economic commanding heights. Many countries include measures to control and occupy these resources in their national development plans in order to seize the right to occupy the "blue commons". [0003] Due to the complex and harsh deep-sea environment (low temperature, high temperature-hydrothermal zone, high pressure, extreme microbial corrosion, etc.), higher requirements are put forward for the comprehensive mechanical properties and corrosion resistance of service material...

AI Technical Summary

Problems solved by technology

At present, compared with foreign developed countries, my country's marine resource development technology and scientific research have been at a relatively backward level for a long time, and it has lost its opportunity in the international deep-sea resource competition. The biggest technical bottleneck is the research and development of deep-sea equipment supporting materials. Taking deep-sea oil and gas drilling as an example, the life of domestic screw drilling tools is only 80 hours, the life of drill collars is only 200-500 hours, and the number of shocks of jars is only 100 times.

At the same time, the average service life of deep-sea fishing tools such as grinding and milling is only 6 hours, and the selected materials have exposed serious problems in terms of strength, low-temperature toughness, and corrosion resistance, which have significantly restricted the country's deep-sea resources. development and utilization of

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