Some Studies on the Sulphide Corrosion Cracking of Chromium-Molybdenum Steels (Report 1)

Abstract

Recently, the problem in sulphide corrosion cracking of the LP gas plants has been studied vigorously in laboratories.
But, the object of this study is related to high strength steels because these are used for constructing the LP gas plants.
It is a familiar fact that Chromium-Molybdenum low alloy steels are superior in sulphide corrosion cracking to other high strength steels.
But, generally it is recognized that Chromium-Molybdenum steels are poor in weldability.
Authors hrve commenced this study to clear this sulphide corrosion cracking of 21/4% Cr-I% Mo weldmetal.
The conclusions of this report are as follows.
1. The embrittlement of this Chromium-Molybdenum steel in the solution of 0. 5% acetic acid saturated by hydrogen sulphide is regarded as the hydrogen-embrittlement.
2. We can recover the majority percentage of this embrittlement by artificial aging in a short period of time.