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17-7 PH

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17-7 PH

17-7 PH is a precipitation-hardened stainless steel that is well suited for aerospace and other applications requiring high strength and good corrosion resistance and formability. Type 17-7 PH is a Chromium-Nickel-Aluminum, austenitic stainless steel. It is the most formable of all PH grades and has the highest strength and hardness. It is less magnetic than other PH grades and offers minimal distortion upon heat treatment. This material maintains its valuable properties at temperatures up to 800° F (427° C).

Popular in aerospace
The alloy has excellent fatigue properties, good corrosion resistance and is easily formed. Due to the alloys good mechanical and physical properties, 17-7PH is particularly popular in the aerospace sector. The alloy can be used in the manufacture of flat springs up to 315°C (600°F).

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Suitability
17-7PH offers high strength and hardness with minimum distortion under heat treatment. With good formability and excellent fatigue properties, the alloy provides good corrosion resistance. The attractive combination and strength and hardness results in use in such market sectors as aerospace and defence.

Chemical composition of stainless steel 17-7PH

Elementminmax
Carbon, C—0.09
Manganese, Mn—1
Silicon, Si—1
Sulfur, S—0.03
Phosphorus, P—0.04
Chromium, Cr1618
Aluminum, Al0.751.5
Nickel, Ni6.57.75
Iron, Fe—*Balance
*Not exclusively to the element mentioned, but that one predominates other elements that are used only in minimal quantities.

Mechanical properties of 17-7 PH

PropertyValue
Tensile Strength170000 psi
Yield Strength140000 psi
Modulus of Elasticity29600 ksi
Poisson’s Ration0.27 – 0.30
Elongation at Break0.06
Hardness, Rockwell C38

Select AMS Number of 17-7 PH

AMS NumberAlloyTypeUNSCross Ref. SpecMisc./Shape
AMS 552817-7PHStainless SteelS17700
AMS 5528 Plate17-7PHStainless SteelS17700MIL-S-25043Plate
AMS 5528 Sheet17-7PHStainless SteelS17700MIL-S-25043Sheet
AMS 5528 Strip17-7PHStainless SteelS17700MIL-S-25043Strip
AMS 552917-7PHStainless SteelS17700
AMS 5529 Sheet17-7PHStainless SteelS17700MIL-S-25043Sheet
AMS 5529 Strip17-7PHStainless SteelS17700MIL-S-25043Strip
AMS 556817-7PHStainless SteelS17700-Tubing
AMS 564417-7PHStainless SteelS17700
AMS 5644 Bar17-7PHStainless SteelS17700-Bar
AMS 5644 Forging17-7PHStainless SteelS17700-Forging

Fabrication and working Instructions
Stainless Steel 17-7PH hardens rapidly during heat treatment and requires intermediate annealing in deep drawing or in forming intricate parts. In some conditions, like Condition C, for example, this steel can be very hard and strong, which means that advanced fabrication techniques for such materials should be used.

As for machining, special care must be applied to the speed at which the parts are machined. 17-7PH Stainless Steel can display long gummy chips during machining, and therefore slower speeds are recommended, accompanied by constant feeds.

17-7PH Stainless Steel can be welded by all conventional fusion and resistance techniques. However, if optimum mechanical properties are wanted, special care is recommended to find the best heat-treated conditions that should be done during the welding. The following heat treatments of the welded part are also essential for excellent mechanical properties. More precisely, austenite conditioning and precipitation hardening are mandatory after the welding is finished to obtain high strength.

Overall, 17-7PH is not as weldable as 17-4PH Stainless Steel. The reason for this is the high concentration of Aluminum, which deteriorates penetration of the weld, thus creating a bond that is not as strong. Weld slug formation can also be worsened during arc welding, which is another area that requires special care.

Depending on the condition, different heat treatments of 17-7PH are recommended:

Typical applications

Commercial applications for this engineering material include:

Standard specifications

Other industry standards we comply with

Features

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