. It covers a variety of precipitation-hardening (PH) stainless steel grades, such as the widely used 17-4 PH (Type 630)
| ASTM Type | Common Name | UNS Designation | Key Characteristics | |---|---|---|---| | | 17‑4PH | S17400 | Chromium‑nickel‑copper grade; most widely used PH stainless steel; excellent strength and corrosion resistance | | 631 | 17‑7PH | S17700 | Chromium‑nickel‑aluminum grade; outstanding fatigue resistance; ideal for springs and diaphragms | | 632 | – | S15700 | Similar to 631; contains ferrite; low ductility in large diameters | | XM‑16 | – | S13900 | High‑strength grade for specialized applications | | XM‑25 | – | S17400 | Variant of Type 630, machinable in the fully heat‑treated condition | | UNS S46910 | – | S46910 | Developed for high‑temperature service up to 840 °F (450 °C) |
The number of revisions shows the standard's evolution over more than 50 years. The "Redline" version—which highlights changes between editions—is a valuable purchase for anyone tracking updates.
Let’s break down the “why” behind ASTM A564, its most popular grades (17-4 PH, 15-5 PH), and how to legally access the official PDF. astm a564 pdf
The "H" stands for Hardened, followed by the temperature (in Fahrenheit) used for the aging process. A lower aging temperature (e.g., H900) results in higher hardness, while a higher temperature (e.g., H1150) results in better ductility and toughness. Chemical and Mechanical Requirements
Mixers, agitators, and high-pressure pumps.
Known for its excellent machinability even in the fully heat-treated condition. Heat Treatment and Processing Let’s break down the “why” behind ASTM A564,
ASTM A564 defines strict requirements for tensile strength, yield strength, reduction of area, and hardness.
While summaries are helpful, engineers and procurement officers should always consult the full document for:
The Ultimate Guide to ASTM A564: Specifications, Grades, and PDF Resources While summaries are helpful
A crucial note for designers and manufacturers: these steels are generally suitable for machining in the solution-annealed condition, after which they may be age-hardened to full mechanical properties without danger of cracking or distortion. Some types, such as XM-25, are machinable in the as-received, fully heat-treated condition, while others, like UNS S46910, can be machined in the solution-annealed, cold-worked, or age-hardened states.
Deep-well valve shafts, pump impellers, hydraulic cylinders, and subsea completions.