For stainless steel, the system consists of the letter “S” followed by five numbers. In 1970, UNS, jointly sponsored by ASTM and SAE, numbered metals and alloys with the first letter and five digits. Now this simple and easy-to-remember number is well known all over the world. In 1932, AISI published 46 three-digit numbers and their corresponding chemical components, of which 18-8 were named 304. Subsequently, this alloy was introduced by the United States, and it was not until 1927 that the United States produced this alloy for the first time. The alloy V2A developed by Krupp engineers Benno Strauss and Eduard Maurer is very close to today’s 18-8 (type 304 stainless steel), it is recommended for its excellent corrosion resistance, especially in nitric acid. The composition is as follows: Chemical Composition Strauss attended the meeting and published a paper discussing his two alloys: V1M and V2A. In 1924, the American Society for Testing and Materials (ASTM) held a stainless steel symposium in New Jersey.
Krupp works in Germany, was searching for materials suitable for pyrometer tubes and found that Benno Strauss made some iron-chromium alloys with a nickel content of about 8%, after being exposed to acidic fumes in the laboratory for several months, they will not be attacked. In 1912, Eduard Maurer, a metallurgist in the research laboratory of Friedrich A.
The History of 304 Stainless Steel Benno Strauss (1873–1944) Except for high temperature conditions involving high acid and chloride content, it is resistant to food processing environments, as well as organic chemicals, dyes, and a variety of inorganic chemicals. It resists rust in construction applications. It can be hardened by cold work, but cannot be hardened by heat treatment.ĪISI 304 grade stainless steel has a wide range of applications. The alloy has excellent fabricability and weldability. It is essentially non-magnetic when annealed and may become slightly magnetic when cold-worked.
Its nominal composition is 18% chromium and 8% nickel, so it is also called 18/8 stainless steel. 3 Chemical Composition of AISI 304 Stainless SteelĪISI 304 Stainless Steel (UNS S30400) WikiĪISI 304 stainless steel (UNS S30400) is the most widely used austenitic chromium-nickel stainless steel.1 AISI 304 Stainless Steel (UNS S30400) Wiki.
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