Technical Terms

Technical Terms of Products


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  • 4130 Annealed Steel Sheet

    This is the softer and formable condition of 4130 chrome moly sheet (material meets AMS 6350). Also referred to as Condition A.

  • 4130 Normalized Steel Sheet

    This is the harder and stronger condition of 4130 chrome moly sheet (material meets AMS 6345). Also referred to as Condition N.

  • Advanced High Strength Steel (AHSS)

    Advanced High Strength Steel refers to steels produced under precisely controlled manufacturing processes with special chemical composition and multiphase microstructure. Tensile strengths are higher than 113 ksi (780 MPa) and yield strengths are in excess 79 ksi (550 MPa). These materials are engineered to be used in automotive applications because of their higher strength and excellent ductility. Docol®, a Dual Phase Steel, is an Advanced High Strength Steel.

  • Aircraft Quality Material

    This is material produced specifically for aircraft and/or aerospace applications. A particular grade of Aircraft Quality (AQ) metal has the same chemistry as the same grade that is referred to as “Commercial Quality,” however it has been tested and certified, and therefore approved for those uses. Most AQ materials will be designated with AMS or MIL specifications.

  • AISI

    AISI is an acronym for The American Iron and Steel Institute, an association of North American steel producers. It was developed in response to the need for a cooperative organization in the iron and steel industry to collect and share statistics and information, perform investigations, provide a forum to discuss issues and problems, and advance the interests of the industry. It is not uncommon to see many steel number designations, such as 4130, preceded by “AISI” to refer to a particular grade of steel (ex: AISI 4130).

  • AKDQ

    Aluminum killed, drawing quality. It refers to the adding aluminum to molten steel during the alloy process followed by the annealing and tempering the sheet undergoes. The benefit of the Aluminum Killed process is uniformity and consistent performance.

  • Alloy Steel

    This is a steel that has had small amounts of one or more alloying elements (other than carbon) such as manganese, silicon, sulphur, phosphorus, nickel, titanium, copper, chromium and aluminum added to make changes in mechanical or physical properties. It is stronger and harder than carbon steel. 4130 and 4340 are two common grades of Alloy Steel supplied by AED.

  • Aluminum Bar, Cold Finished

    This refers to aluminum bar products that are used in aircraft construction. They typically meet requirements for Aerospace Material Specifications (aka AMS). Cold Finished bars have the same chemistry as Extruded bars but tend to be more expensive and are produced to tighter tolerances with higher mechanical properties.

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