Alloy Steel 17/4 - widely used in the Aerospace, Defence & Motorsport industry

Stainless Steel 17/4

Corrosion Resistant Stainless 17/4PH – AMS5604 | AMS5643 | AMS5622 | ASTM A564 UNS S17400

Product description

Aerocom Metals carry a full range of sheet and bar in the precipitation hardening 17/4 stainless steel. 17/4PH is a martensitic, chromium-nickel-copper precipitation-hardening stainless steel that provides an outstanding combination of high strength, good corrosion resistance, good mechanical properties at temperatures up to 600ºF (316ºC).

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.

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.

Technical Specification

Specification Material Publication Date
AMS5604 Steel, Corrosion Resistant, Sheet, Strip, and Plate 16.5Cr - 4.0Ni - 4.0Cu - 0.30Cb Solution Heat Treated, Precipitation Hardenable 01/05/1968
AMS5643 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr - 4.0Ni - 0.30Cb (Nb) - 4.0Cu Solution Heat Treated, Precipitation Hardenable 01/10/1951
AMS5622 Steel, Corrosion-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Rings 16Cr - 4.0Ni - 0.30Cb - 4.0Cu Solution Heat Treated, Precipitation Hardenable Consumable Electrode Remelted 01/05/1969

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. It is often used for aircraft, dental, marine, medical, and surgical industries.

Technical Data

Mechanicals Chemistry
SpecificationTensile StrengthYield StrengthElongation
H900190 KSI Min170 KSI Min8%
H925170 KSI Min155 KSI Min8%
H1025155 KSI Min145 KSI Min8%
H1075145 KSI Min125 KSI Min9%
H1100140 KSI Min115 KSI Min10%
H1150135 KSI Min105 KSI Min10%
ElementLower %Upper %
Carbon-0.070
Manganese-1.000
Silicon-1.000
Phosphorus-0.040
Sulfur-0.030
Chromium15.00017.500
Molybdenum-0.500
Columbium (Niobium)5xC0.450
Titanium--
Aluminium--
Cobalt--
Copper3.0005.000
Nickel3.0005.000

Aerocom Stock List

Sheet & Plate Bar
Sheet Size (Inches)
Thickness (Inches)60" x 36"
0.032X
0.040X
0.050X
0.063X
0.080X
0.100X
0.125X
0.250X
0.500X
0.750X
1.000X
1.500X
Stock
Diameter (Inches)
0.125X
0.250X
0.375X
0.438X
0.500X
0.625X
0.750X
0.875X
1.000X
1.125X
1.250X
1.500X
1.750X
2.000X
2.500X

Our Approvals

Leonardo Aerostructures Leonardo Aircraft Leonardo Helicopters Airbus Helicopters
UTC SAFRAN GE Power ISO9001:2015
AS9120B Westland SQA50 Britten-Norman

Other Information