GB/T 41756-2022 Corrosion of metals and alloys—Method for estimating the atmospheric corrosion resistance of low-alloy steels

Scope

This document presents three evaluation methods for the atmospheric corrosion resistance of low-alloy steel. Method 1 is a prediction method based on the short-term corrosion data of steel; Method 2 is a prediction method based on the chemical composition of steel; and Method 3 is a prediction method based on environmental factors and the chemical composition of steel.
In this document, Method 1 is suitable for evaluating the long-term corrosion loss of low-alloy steel based on the existing short-term atmospheric corrosion data of specific grades of low-alloy steel in different environments; Method 2 is suitable for evaluating the relative corrosion resistance of low-alloy steel based on the corrosion resistance index (I); and Method 3 is suitable for estimating the corrosion loss of low-alloy steel in different environments at different times.
Note: These three methods are calculated based on the experimental data of exposed specimens of bare steel plates. When low-alloy steel is exposed to a humid environment for a long time, or is severely corroded by some salts or other corrosive chemicals, the actual atmospheric corrosion rate will be much higher.

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