This article provides a comprehensive overview of the AISI-SAE designation system for steel classification, focusing on structural, constructional, stainless, and heat-resistant steels. It examines how the four-digit SAE numerical system categorizes carbon and alloy steels based on chemical composition, with carbon steels comprising the 1xxx groups. The article includes detailed standard lists for structural steels, stainless steels, and steel castings, serving as a valuable reference for engineers, manufacturers, and researchers working with these materials across various industrial applications including pressure vessels, general service tubing, and construction.
The Society of Automotive Engineers (SAE) utilizes a fundamental four-digit system to designate the chemical composition of carbon and alloy steels. In this system, the first digit (1) indicates a carbon steel; consequently, carbon steels comprise the 1xxx groups in the SAE-AISI system. These carbon steels are further subdivided into four categories due to significant variations in their fundamental properties.For decades, specific grades of carbon and alloy steels have been identified using the four-digit AISI/SAE numerical index system, which classified grades according to standardized chemical compositions. However, since the American Iron and Steel Institute (AISI) discontinued writing material specifications, the relationship between AISI and grade designations has been terminated. As of the 1995 Iron and Steel Society (ISS) Strip Steel Manual, these four-digit designations are now referred to exclusively as SAE Designations.
This article provides detailed information on standards relating to the following material categories:
For more information on the AISI-SAE designation system see our related article: Introduction to the AISI-SAE Designation System.
The standards listed below encompass a wide range of materials and applications, including:
Table 1. Structural and Constructional Steels Standards
Table 2. Stainless and heat-resistant steels Standards
Table 3. Steel Castings Standards
The AISI-SAE standard lists presented in this article serve as a valuable reference for engineers, materials scientists, and manufacturers working with various types of steel. These standards ensure consistency in material properties and performance across different applications and industries. By understanding these classifications, professionals can select the appropriate steel type for specific requirements, whether for structural, high-temperature, or specialized applications.
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