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Home | Specifications | Alloy Plate - 4140/4340/8620

Alloy Plate - 4140 / 4340 / 8620 - ASTM A 829
Standard specification for Alloy Steel Plate Furnished to Chemical Composition Requirements

ASTM A 829 was first issued in 1984; prior to that these grades were defined by AISI specifications.

This specification covers structural quality alloy steel plates furnished to chemical composition requirements only. There are no tensile requirements or other mechanical property requirements for this specification.

The ASTM A 829 specification covers 30 standard chemistries. Oliver Steel offers these chemistry-only alloy plate grades in the three most commonly used chemistries. 4140 is the standard for medium carbon chromium-molybdenum alloy with excellent response to quench-and-temper and moderate through hardening capabilities; at Oliver, our 4140 is modified to include a small amount of vanadium for even better hardening. 4340 includes nickel for higher overall hardness and superb through hardening. 8620 is alloyed for as-rolled core strength but can be readily carburized.

General requirements for delivery
Material shall conform to the requirements of ASTM A 6.

Chemical Requirements

Chemical Requirements

Single values are maximums.

Tensile Requirements
There are no mechanical property requirements for these grades. Generally, the alloy content provides the potential for these steels to achieve certain mechanical properties when they are subjected to the appropriate thermal treatment process. This is usually performed after flamecutting or sawcutting, and is done to achieve the specific properties required by the end-use application. Oliver provides a complete range of thermal treatment process options.

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