American Iron and Steel Institute

Standard Wrought Steels. Steels containing 11% and more of chromium are classed as stainless steels. The prime characteristics are corrosion and oxidation resistance, which increase as the chromium content is increased. Three groups of wrought stainless steels, series 200, 300, and 400, have composition limits that have been standardized by the American Iron and Steel Institute (AlSl) (see Steel). Figure 8 compares the creep—mpture strengths of the standard austenitic stainless steels that are most commonly used at elevated temperatures (35). Compositions of these steels are Hsted in Table 3. 

MnnualStatisticalKeport, American Iron and Steel Institute, Washington, D.C., 1992. 

American Iron and Steel Institute 1123 15th Street, NW Washington, D.C. 20005 Standards for steel compositions, steel products, manufacturing tolerances, inspection methods, etc. 

The AISI (American Iron and Steel Institute) and the SAE (Society of Automotive Engineers) specifications are essentially the same. The Hst is simplified to show typical compositions. Eor ranges, see original tables. 

SAE is the Society of Automotive Engineers. AISI is the American Iron and Steel Institute the XX after the designation is left open for carbon content, thus 3110 equals a 0.10% carbon, nickel-chromium steel, and ia this case XX = 0.10. 

Dimensions of extra-heavy couplings are given in the Steel Products Manual pubhshed by the American Iron and Steel Institute. In ANSI B16.il—1966, 2000-lb couplings were superseded by 3000-lb couplings. 

A typical low-alloy grade [American Iron and Steel Institute (AISI) 4340] contains 0.40 percent C, 0.70 percent Mn, 1.85 percent Ni, 0.80 percent Cr, and 0.25 percent Mo. Many other alloying agents are used to produce a large number of standard AISI and proprietary grades. 

When possible, earlier widely used three- or four-digit alloy numbering systems such as those developed by the Aluminum Association (AA), Copper Development Association (CDA), American Iron and Steel Institute (AISI), etc., have been incorporated by the addition of the appropriate alloy-group code letter plus additional digits. For example ... 

ABS—American Bureau of Shipping A ISC—American Institute of Steel Construction AISI—American Iron and Steel Institute ANSI—American National Standard Institute API—American Petroleum Institute ASA—American Standards Association ASTM—American Society for Testing and Materials AWS—American Welding Society... 

National standards. British Standards, DIN (Deutsche Industries Normung, from Germany) and ASTM/AISI (American Society for Testing of Materials/American Iron and Steel Institute) are those in most common use for metallic materials. It is always preferable to select a material for which national or international specifications exist. Many materials, including steels and the... 

American Iron and Steel Institute (AISI), 23 291, 299. See also AISI alloy steels American Iron and Steel Institute and Department of Energy (AISI-DOE) process, 14 521... 

AISI 1991, Load and Resistance Factor Design Specification for Cold-Formed Steel Structural Members, American Iron and Steel Institute, New York, NY, 1991... 

A four- or five-digit numbering system has been established to classify and identify different types of steel. Originally developed by the Society of Automotive Engineers (SAE) this system is now used by the American Iron and Steel Institute (AISI) to classify steel. 

AISI American Iron and Steel Institute Ammoniak krut see the text... 

Alloy Steels. An alloy steel as defined by The American Iron and Steel Institute is "By common custom alloy steel is considered to he alloy... 

Reprinted with permission from The Role of Stainless Steels in Petroleum Refining, April 1977, American Iron and Steel Institute, Washington, DC.)... 

Because of the many types of rolled and forged steel products used in industry, basic specifications are needed to designate the various types. The American Iron and Steel Institute (AISI) has set up a series of standards for steel products. However, even the relatively simple product descriptions provided by AISI and shown in Table 2 must be used carefully. For instance, the AISI 1020 carbon steel does not refer to all 0.20 percent carbon steels. AISI 1020 is part of the numerical designation system defining the chemical composition of certain standard steels used primarily in bar, wire, and some tubular steel products. The system almost never applies to sheets, strip, plates, or structural material. One reason is that the chemical composition ranges of standard steels are unnecessarily restrictive for many applications. 

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