In a boiler that made as per China GB standards, the materials are normally named as per their chemical element composition. This is always make engineers outside China confused. The way of naming is controlled by national standard “GB/T 221-2008 Notations for designations of iron and steel”.
In order to help engineers outside China understand GB, we made the following sheet to compare the common use materials.
Materials listed in the sheet are equivalent or same on Chemical Composition and Physical performance.
The only difference is sizing. Sizing of materials in GB are using ISO unit, which is millimeter (mm), in ASME is Inch.