Method for evaluating environmental embrittlement resistance under simulated condition of R6 mooring chain

Abstract

The invention discloses a method for evaluating environmental embrittlement resistance under a simulated condition of an R6 mooring chain. The method comprises the following steps of: step 1, determining a sampling site, wherein the two sets of samples are taken from the ring straight body of the R6 mooring chain; step 2, preparing a reference electrode and an anode electrode; step 3, mounting a set of samples on an electro-hydraulic servo universal material testing machine, placing the reference electrode and the anode electrode, and putting into the pre-configured artificial seawater to immerse a tensile sample and the electrodes; step 4, charging a CT sample with hydrogen, wherein charging time is 48 hours; step 5, setting a strain rate and starting the test; and step 6: evaluating crack resistance by a section shrinkage rate by a slow strain rate tensile test, and evaluating environmental sensitivity of a product by a KIEAC form by a compact tensile test. The method for evaluatingthe environmental embrittlement resistance under the simulated condition of the R6 mooring chain has simple operation and is suitable for the R6 mooring chain with tensile strength above 1100 MPa, andcan analyze the hydrogen evolution potential, thereby limiting the potential protected by a hull cathode.

Description

technical field [0001] The invention relates to the field of mooring chains, in particular to a method for evaluating the anti-environmental embrittlement performance of R6 mooring chains under simulated working conditions. Background technique [0002] The mooring chain is a kind of equipment that fixes the marine floating structure in its operating position. It is a key component of offshore mooring positioning and an indispensable safety guarantee equipment for the mooring of mining and processing devices. According to the mechanical properties, it can be divided into R3, R3S, R4, R4S, R5, R5S, R6 and other grades. In recent years, the sensitivity to environmental hydrogen-induced corrosion has attracted more and more attention from the deep-sea offshore oil and gas industry, so customers have higher and higher requirements for the performance and reliability of mooring chains. The tensile strength of R6 mooring chains is above 1100MPa. The service environment involves d...

AI Technical Summary

Problems solved by technology

In addition, the mooring chain is affected by the external cathodic protection of the hull during use. When the protection potential is low, it will promote the precipitation of hydrogen, which will affect the use of the mooring chain.

Therefore, it is also necessary to analyze the hydrogen evolution potential of the mooring chain itself to limit the potential of the cathodic protection of the hull

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