Seawater corrosion resistant austenitic stainless steel and application thereof

Abstract

The invention relates to seawater corrosion resistant austenitic stainless steel and application thereof, belonging to field of the metallurgical alloy and the application thereof. The matrix materials of the seawater corrosion resistant austenitic stainless steel comprise the following components by weight percent in addition to allowed trace impurities: 0.08 percent of C or more, 0.10 percent of Si or more, 2.00 percent of Mn or more, 0.04 percent of P or more, 0.03 percent of S or more, 7-10 percent of Ni, 17-19 percent of Cr, 1-2 percent of Cu, 0.05 percent of Nb or more and the balance of Fe. The seawater corrosion resistant austenitic stainless steel is used for manufacturing the floating production storage and offloading (FPSO) system and the air valve matched with the oil tanker. The austenitic stainless steel can resist the long-time corrosion of the seawater and the seawater vapor so as to ensure that the air valve operates safely and is free from the accident.

Description

technical field [0001] The invention relates to the field of smelting alloys and their applications, in particular to a seawater corrosion-resistant stainless steel and its applications. Background technique [0002] With the rapid development of my country's shipbuilding industry, various ultra-large marine vessels have been built and delivered for use, especially deep-water operating vessels for marine engineering and FPSO floating production and storage systems integrating offshore oil production, oil storage and transportation. , It also marks that my country's shipbuilding industry has risen to a new level. [0003] According to the regulations of the International Maritime Organization and the classification societies of various countries, vent valves (P / V valves) must be installed on large ships involved in oil transportation to ensure safe and reliable transportation and storage of oil products. The production and storage system has been sailing in major waters of th...

AI Technical Summary

Problems solved by technology

[0003] According to the regulations of the International Maritime Organization and the classification societies of various countries, vent valves (P / V valves) must be installed on large ships involved in oil transportation to ensure safe and reliable transportation and storage of oil products. The production and storage system has been sailing in major waters of the world all year round, and the breather valve is an important part that is installed outside the cabin and is exposed to the atmosphere at all times. It is exposed to wind, rain, and waves, and the climate temperature difference between tropical and frigid zones is very large. Its working environment is very harsh, and it is impossible to replace it at will during transportation. The general corrosion-resistant stainless steel can no longer meet the harsh working environment of the breather valve. The stainless steel used in the breather valve has been observed to be rusted after a short period of time. In particular, the corrosion of the seal at the mouth of the vent valve is likely to cause the seal to be loose, which can easily lead to unsafe accidents and cause serious losses to national property.

At present, no ideal steel grades are available for selection