is the standard specification for hot-rolled and cold-finished age-hardening (precipitation-hardening) stainless steel bars and shapes. These materials are unique because they offer the excellent corrosion resistance of austenitic stainless steel combined with the high strength of martensitic or low-alloy steels.
: High-pressure pump shafts, valves, and mixer impellers.
The specification covers bars and shapes, including rounds, squares, hexagons, and angles, typically produced by forging, extruding, or rolling.
: Aged at 1025°F (552°C). Offers a balance of high strength and moderate ductility. astm a564 pdf
ASTM A564 materials maintain high mechanical properties up to . This performance makes them standard in aggressive industrial environments:
Often classified here due to its unique processing path, requiring a transformation from an austenitic structure to a martensitic structure before final aging. Heat Treatment Conditions and Terminology
ASTM A564 includes several specialized PH stainless steel grades: Titanium Industries, Inc. Type 630 (UNS S17400): Commonly known as 17-4 PH. Type XM-12 (UNS S15500): Known as 15-5 PH. Type XM-13 (UNS S13800): Known as 13-8 PH. Type XM-25 (UNS S45000): Custom 450. Type 631 (UNS S17700): The specification covers bars and shapes, including rounds,
The number represents the hardening temperature (e.g., 900∘F900 raised to the composed with power F 1150∘F1150 raised to the composed with power F
: Aged at 900°F (482°C). Provides the highest tensile strength but lower impact toughness.
This sets the temperature limits. Most of these steels work beautifully at room temperature up to 600°F (315°C). 2. Chemical Composition ASTM A564 materials maintain high mechanical properties up
The "story" of A564 is the story of how metallurgists solved a century-old problem: Stainless steel (like 304 or 316) is corrosion-resistant but often too soft for heavy load-bearing applications. High-strength steels are hard but rust easily. ASTM A564 covers the alloys that bridge this gap. They are corrosion-resistant like stainless steel but strong enough to be used in landing gear and nuclear reactors.
Mixers, impellers, and heat exchanger parts handling corrosive slurries.
The table below summarizes the chemical composition of the most popular grade, Type 630: