Age‑hardening (also called precipitation‑hardening) is a heat‑treatment process that produces exceptionally high strength in stainless steels without sacrificing corrosion resistance. The process involves a solution‑annealing step followed by a controlled aging treatment that precipitates fine intermetallic particles, dramatically increasing strength and hardness. This family of materials offers a unique combination of:

Other grades include Type 631, Type 632, UNS S46910, and custom grades like Custom 465 (1.4614). These alloys offer specialized properties, such as higher temperature resistance or enhanced toughness, and are often used in demanding aerospace applications.

The governing body where the full standard can be purchased. Material Suppliers:

: It covers chromium-nickel-copper precipitation-hardening martensitic stainless steels, often with niobium additions. Hardening Process

Since ASTM standards are copyrighted, the full PDF is not typically available for free. You can find the most recent version (currently ASTM A564 / A564M-19 ) through official distributors: ASTM International

Utilize corporate subscription platforms like IHS Markit, Techstreet, or ANSI to access real-time updates.

This is arguably the most common grade under this specification.

| Standard | Title | Relationship to A564 | |---|---|---| | | General Requirements for Stainless Steel Bars, Billets, and Forgings | Sets general dimensional, tolerance, and finish requirements | | A705/A705M | Age‑Hardening Stainless Steel Forgings | Companion specification for forged products | | A314 | Stainless Steel Billets and Bars for Forging | Governs billets intended for reforging | | A370 | Mechanical Testing of Steel Products | Defines tension and hardness test procedures | | A751 | Chemical Analysis of Steel Products | Defines chemical composition verification methods |

yields the highest tensile strength but lower impact toughness.

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The ASTM A564 standard mandates strict limits on chemical composition and minimal thresholds for mechanical performance. Below is a generalized breakdown of what the standard dictates for the popular across various conditions: Heat Treatment Condition Tensile Strength (min, ksi) Yield Strength (min, ksi) Elongation in 2 in. (min, %) Hardness (Rockwell C) Condition A Not Specified Not Specified Not Specified Max 38 HRC (typical) H900 40 - 47 HRC H1025 35 - 42 HRC H1150 28 - 37 HRC Key Applications of ASTM A564 Materials

Always ensure you are using the most current revision of the for accurate chemical and mechanical specifications. Conclusion