17-4 STEEL

17-4 Precipitation-Hardening Stainless Steel

Alro stocks 17-4 Stainless - a chromium-copper precipitation hardening stainless steel used for applications requiring high strength and a moderate level of corrosion resistance. 17-4 PH is a chromium-nickel grade of stainless that may be hardened by a single low temperature precipitation-hardening heat treatment. Excellent mechanical properties at a high strength level may be obtained by such treatment. Scaling and distortion is minimized. 17-4 PH should not be used in the solution treated condition.  17-4 machines well, has excellent welding characteristics, and forges easily. The combination of good mechanical and processing properties makes this grade adaptable to a wide range of uses. Alloy 17-4 PH withstands corrosive attacks better than any of the standard hardenable stainless steels and is comparable to Alloy 304 in most media.

Properties

The physical properties of 17-4 PH stainless steel vary depending on any tempering processes done to the material. If you require specific physical properties for your application, please contact an Alro Sales Representative to make sure this material will meet your needs.

Typical Uses

Typical applications for 17-4 stainless steel include:

1. Motor Shafts

2. Aircraft Structural Parts

3. Valve Stems

4. Gears

Strictly speaking, stainless doesn’t rust, but like all materials, there are some environments which are just too corrosive and it will be attacked. When stainless is attacked, the corrosion product looks just like the rust you get on carbon steel.

17/4 takes its name from the 17% Chromium and 4% Nickel composition. It also contains 3% Copper. This composition makes 17/4 a great choice for applications requiring high strength and hardness in combination with moderate corrosion resistance.

17/4PH (precipitation hardening grade) of stainless steel offers a good balance between corrosion resistance and strength. It is magnetic and hardenable to various strength levels by varying the aging heat-treating temperature.

Grade 17/4PH generally has better corrosion resistance than the 400 series stainless steels because of the low carbon content. A range of properties and hardness is achieved by modifying the aging temperature during heat treatment.

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