There are two general areas PH grade stainless steels; martensitic and semi-austenitic. The group includes martensitic 17-4 and 15-5 chromiumnickel PH® PH® with columbium and copper additions. They develop a high strength and hardness by heat treatment, which precipitates the copper. The PH martensitic steels used in aerospace, chemical and petrochemical, and food processing applications. The semi-austenitic grade PH® 17-7 and 15-7 PH Mo®.
They are in the state annealed austenitic, martensitic condition but hardened. 17-7 PH stainless high strength and excellent fatigue properties, and used in aerospace components. PH 15-7 Mo stainless used in applications requiring high strength and hardness, such as keeping rings, springs and aircraft bulkheads. Surface? An important component in any application or buy a specified order?
Stainless steel regardless of the intended end use nish. And, for those applications where appearance is important ,? Nish is a design element and must be speci? Ed. In architecture or other visible applications, the appearance of stainless steel and specified critical design element? Request the wrong? Can change the e nish needed? Ect. In consumer products, the gleam of a polished stainless steel strong sales appeal. In institutional kitchen, restaurant, and hospital applications, properly helps? Stainless given to emphasize the feeling of cleanliness.