1.4301 is the European EN 10088​ designation, while AISI 304​ is the American ASTM/UNS​ designation. They represent the same basic austenitic stainless steel grade, with essentially identical chemistry and mechanical properties; the differences lie mainly in the standards' specified limits and testing methods.

ASTM A269 is a standard specification for seamless and welded austenitic stainless steel tubing used for general service in low or high-temperature environments. It covers various grades, such as TP304, TP304L, TP316, and TP316L, defining their chemical composition and mechanical properties like tensile strength, yield strength, and hardness. This standard also mandates specific tests to ensure the tubing meets the requirements for corrosion resistance and other applications.

ASTM A249 is a standard specification for welded austenitic steel tubes used as boilers, superheaters, heat exchangers, and condensers. It covers the chemical and mechanical requirements, testing, and quality control for these tubes, which are available in various grades like TP304, TP304L, and TP316L. The specification defines the size range, dimensional tolerances, heat treatment, and surface finish requirements for the tubes.

ASTM A790 is the Standard Specification for Seamless & Welded Ferritic/Austenitic Stainless Steel Pipe. Read more at Langley Alloys.

ASTM A240 is a standard specification for chromium and chromium-nickel stainless steel plates, sheets, and strips used in pressure vessels and general applications. It defines the chemical composition, mechanical properties, and other requirements for various stainless steel grades, ensuring they meet specific corrosion resistance and strength standards. This includes common grades such as 304, 316, and various duplex stainless steels.

Application fields 304 stainless steel is widely used in food, pharmaceutical, chemical, and construction fields. 409 stainless steel is mainly used in automotive, manufacturing, and construction fields, especially in automotive exhaust systems.