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These ASTM 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 etc.īelow you will find as an example a table with chemical requirements for fittings ASTM A403 Grade WP304, WP304L, WP316L and a table with frequent Grades, arranged on pipe and pipe-components, which belong together as a group.Īs you may be have noted, in the table below, ASTM A105 has no Grade. The material qualities for these pipes are defined in the ASTM standards. Dimensions from carbon steel pipes are defined in the ASME B36.10 standard, dimensions for stainless steel pipe are defined in the ASME B36.19 standard.