Precipitation-Hardening Stainless Steel Family

On average, the general corrosion resistance is below that of t) e 304 stainless. However, the corrosion resistance of t) e PH 15-7 Mo alloy approaches that of type 316 stainless. The martensitic and semiaustenitic grades are resistant to chloride stress cracking. These materials are susceptible to hydrogen embrittlement. 

The PH steels find a myriad of uses in small forged parts and even in larger support members in aircraft designs. They have been considered for landing gears. Many golf club heads are made from these steels by investment casting techniques, and the manufacturers proudly advertise 

Generally, this alloy should be considered where high strength, toughness, corrosion resistance, and resistance to SCC are required in a stainless steel showing minimal direction-ability in properties. 

---