A sleeve for mechanical connection of low-temperature-resistant steel bars for LNG storage tanks and its manufacturing method

Abstract

The present application provides a sleeve for mechanically connecting low-temperature resistant steel bars for LNG storage tanks and a manufacturing method, which relate to the field of low-temperature steel. The chemical composition of the sleeve includes by mass percentage: C: 0.09% to 0.15%, Si: 0.15% to 0.35%, Mn: 0.60% to 0.80%, Cr: 14.0% to 16.0%, Ni: 1.45% to 1.65% %, V: 0.03%~0.05%, Cu: 0.12%~0.16%, Co: 0.015%~0.03%, Als: 0.01%~0.02%, P≤0.015%, S≤0.01%, N: 0.008%~0.015 %, the rest is Fe and unavoidable impurities; the microstructure of the sleeve is uniform sorbite. The sleeve manufactured by the application has good tensile strength, elongation, corrosion resistance and other properties at low temperature, meets the design and construction requirements of LNG storage tanks, and has low cost.

Description

technical field [0001] The present application relates to the field of low-temperature steel, in particular, to a sleeve for mechanically connecting low-temperature-resistant steel bars for LNG storage tanks and a manufacturing method. Background technique [0002] As a clean, efficient and high-quality energy source, natural gas (LNG) plays an increasingly important role in optimizing energy consumption structure, controlling greenhouse gas emissions, and improving the atmospheric environment. Demand is increasing, and China's liquefied natural gas (LNG) production and imports are growing steadily. In 2020, LNG imports will reach 69.59 million tons, making it the world's largest LNG importer. LNG needs special storage tanks for reception and storage. In order to meet the growth of demand, the country is vigorously building liquefied natural gas receiving stations in coastal areas. LNG storage tanks are the core of receiving stations. Safety, the steel bars used in the cons...

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Problems solved by technology

Although the sleeve made by it satisfies the standard requirements of JGJ107 "Technical Regulations for Rebar Mechanical Connection" in terms of performance, it has the following shortcomings: the tensile strength, elongation, and corrosion resistance at low temperature are not high, and the composition uses High manganese, high vanadium, high cost

[0006] In addition, a large number of low-temperature steel bars and steel for offshore platforms have been disclosed in the prior art, which are not suitable for sleeves for mechanical connection of low-temperature-resistant steel bars for LNG storage tanks in terms of application environment and performance indicators.

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