0Cr17Ni7Al(17–7PH) chemical composition

17–7PH is a stainless steel alloy with excellent mechanical properties, corrosion resistance, formability, and good welding characteristics. The alloy is composed of 17 percent chromium and 7 percent nickel, along with trace amounts of aluminum, manganese, phosphorus, silicon, and sulfur. The online metallurgy database Matweb, maintained by the American Society for Testing and Materials, lists the following predominant chemical composition for 17–7 PH (in weight percent):

Carbon (C): 0.07 max

Manganese (Mn): 0.75 max

Phosphorus (P): 0.04 max

Sulfur (S): 0.03 max

Silicon (Si): 0.50 max

Chromium (Cr): 16-18%

Nickel (Ni): 6.5-8%

Aluminum (Al): <0.7%

17–7 PH stainless steel is sometimes referred to as “precipitation-hardening”. This designation indicates that the alloy can be hardened by an aging process referred to as “age hardening” or “precipitation hardening”. Age hardening is typically carried out by heating the alloy to temperatures of around 900-1200°F (482-649°C) for several hours and then allowing it to cool slowly at room temperature.

The combination of chromium, nickel and aluminum in the alloy provides for a wide range of beneficial properties. One of the most significant benefits of 17–7 PH stainless steel is its strength and corrosion resistance. In addition to providing strength and corrosion resistance, this alloy is highly resistant to corrosion in acidic and alkaline environments, making it well suited for use in medical and food industry applications-specifically in medical implants, surgical instruments, and food processing equipment. 17–7 PH stainless steel is also known for its good formability due to its low-energy hot working and cold working capabilities.

17–7PH(AISI 631/UNS S17700)is an age-hardening martensitic stainless steel. Its composition includes 17.0% chromium and 7.0% Nickel, as well as small amounts of aluminum (Al) and manganese (Mn). 17–7PH alloy achieves its optimal mechanical properties after the heat treatment process. In order to achieve its full hardness potential, the material must go through the double tempering technique at a higher temperature.

Due to its higher ratio of aluminum, 17–7PH has excellent high-temperature strength, even at temperatures of up to 650°F (343°C). It also provides excellent resistance to crevice and pitting corrosion, which makes it an ideal material for marine and chemical processing applications. 17–7PH’s ability to age harden also gives it good formability, allowing it to be molded into shapes and objects for use in a wide range of industrial applications.

17–7PH has properties that make in a perfect choice for a wide range of industrial applications, including:

• Aerospace components

• Chemical Processing

• Medical Devices

• Nuclear valves

• Marine Components

• Watchmaking Components

• Food and Beverage Processing Equipment

17–7PH can also be treated with a passivation process to increase its corrosion resistance. Its hardness and ductility are also improved by cold working, or by putting it through various stress-relief treatments. Its excellent heat resistance makes it a great choice for applications that require parts and components to be exposed to high temperatures for extended periods of time.

17–7PH is an ideal choice for those looking for a stainless steel that is both corrosion and heat-resistant and has age-hardening properties. It is easy to work with and form into complex geometries, allowing it to be used in a wide variety of industries. Its excellent heat resistance and ability to resist corrosion make it an excellent choice for industrial applications.