PH 13-8Mo (UNS S13800 / W.Nr. 1.4534)
PH 13-8Mo (UNS S13800 / W.Nr. 1.4534) is a martensitic precipitation/age-hardening stainless steel capable of high strength and hardness along with good levels of resistance to both general corrosion and stress-corrosion cracking. In addition, the alloy exhibits good ductility and toughness in large sections in both the longitudinal and transverse directions. The excellent properties of PH 13-8 Mo stainless are obtained through close control of chemical composition and microstructure plus specialized melting which reduces impurities and minimizes segregation. Compared to other ferrous-based materials, this alloy offers a high level of useful mechanical properties under severe environmental conditions.
Chemical Composition, %
Typical Physical and Mechanical Properties (RT, Annealed)
|Density, g/cm3||Melting Point, ℃||Tensile Strength, MPa||Yield Strength, MPa||ELongation, %||Hardness, HRB|
Available Products and Specifications
|Rod, Bar, Wire and Forgings||ASTM A564, 705, SAE AMS 5629|
|Plate, Sheet and Strip||ASTM A693, SAE AMS 5604|
|Pipe and Tube||–|
PH 13-8 Mo stainless has good fabrication characteristics and can be age-hardened by a single low temperature treatment. Cold work prior to aging increases the aging, especially for lower aging temperatures.
PH 13-8 Mo stainless has been used for valve parts, fittings, cold-headed and machined fasteners, shafts, landing gear parts, pins, lockwashers, aircraft components, nuclear reactor components and petrochemical applications requiring resistance to stress-corrosion cracking. Generally, this alloy should be considered where high strength, toughness, corrosion resistance, and resistance to stress-corrosion cracking are required in a steel showing minimal directionality in properties.