ANSI / NACE MR0175 / ISO 15156 gives requirements and
recommendations for the selection and qualification of carbon
and low-alloy steels and corrosion-resistant alloys (CRAs) for
equipment in oil and gas production in H2S-containing
environments. When selecting a material that will be exposed to
H2S, the user can select CRAs from NACE MR0175 Part 3 Annex A
using the materials selection tables. This infographic analysis the
information shown in the material selection tables.
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change. Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...

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