Precipitation hardening stainless steels are chromium and nickel containing steels that provide an optimum combination of the properties of martensitic and austenitic grades. Like martensitic grades, they are known for their ability to gain high strength through heat treatment and they also have the corrosion resistance of austenitic stainless steels.
The high tensile strengths of “PH” stainless steels come after a heat treatment process that leads to precipitation hardening of a martensitic or austenitic matrix. Hardening is achieved through the addition of one or more of the elements copper, aluminum, titanium, niobium, and molybdenum.
17-7PH stainless is a chromium-nickel-aluminum alloy that resists corrosion, distortion and scaling at elevated temperatures (up to approximately 800 degrees Fahrenheit). However, because 17-7H PH can be processed at very low temperatures, it has fewer issues with surface scaling and heat distortion than alloys that must be treated at higher temperatures. 17-7 PH is an economical choice for engineers in the medical, aerospace and energy and food processing industries who need to design high quality parts with good formability, high strength, minimum distortion after heat treatment, good corrosion resistance and with superior strength and fatigue properties.
Grade 17-7 PH is best used when manufacturing or the environment calls for moderate corrosion resistance combined with an unusually high degree of strength. Tube Hollows International machines custom tubing and tubular components for medical devices and aerospace applications from this highly versatile alloy.