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17-7 PH Stainless Steel

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17-7 PH Stainless Steel (UNS S17700)

17-7 PH stainless steelAltemp Alloys carries a variety of stainless steels with the ability to withstand high temperatures. Of the most frequently used in the the aerospace industry and when meticulous, elaborate parts are needed, 17-7 PH stainless steel is a common choice.

A stable, chromium-nickel-aluminum steel, 17-7 is a precipitation hardening steel with a high strength and moderately resistant to corrosion. In terms of corrosion resistance, 17-7 PH stainless steel is comparable to 304 stainless steel and a better choice when compared to the 400 series of stainless steel. 17-7 from Altemp is specified to AMS 5528, 5529, 5644 & ASTM A 564, 693. 

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17-7 PH Shapes

Altemp Alloys offers 17-7 PH stainless steel UNS S17700 in:

17-7 PH Composition

The chemical composition of 17-7 breaks down as follows:

  • Chromium: between 16.0 and 18.0 percent
  • Nickel: between 6.50 and 7.75 percent
  • Aluminum: between 0.75 and 1.50 percent
  • Manganese: up to 1.00 percent
  • Silicon: up to 1.00 percent
  • Carbon: up to 0.09 percent
  • Phosphorus: up to 0.04 percent
  • Sulfur: up to 0.03 percent
  • Iron: makes up the remainder

Standard 17-7 PH Heat Treatments

Heat treatments can strengthen this type of stainless steel. The approved process for 17-7 PH heat treatments has three steps:

  • Conditioning using austenite.
  • Cooling, which turns the austenite into martensite.
  • Precipitation hardening until Condition TH 1050 or RH 950 is reached.


Due to its strength and corrosion resistant, 17-7 PH applications include:

  • Springs
  • Washers
  • Blades
  • Fluid seal springs
  • Diaphragms
  • Pressings
  • Flexures
  • Encapsulated bellows

Altemp Alloys also stocks a number of other stainless steel alloys, including 15-5 PH and A-286.

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