![]() ![]() Pipes - Fittings - Flanges - Valves - Stud BoltsĪccording to various AsTM standards What are ASTM Grades.ĪSTM standards define the specific manufacturing process of the material and determine the exact chemical composition of pipes, fittings and flanges, through percentages of the permitted quantities of carbon, magnesium, nickel, etc., and are indicated by "Grade".įor example, a carbon steel pipe can be identified with Grade A or B, a stainless-steel pipe with Grade TP304 or Grade TP321, a carbon steel fitting with Grade WPB etc.īelow you will find as an example 3 tables with chemical requirements for.
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