Alloy Steel 17/7 - widely used in the Aerospace, Defence & Motorsport industry

Stainless Steel 17/7

Corrosion Resistant Stainless 17/7PH – AMS5528 | AMS5529 | AMS5644 | AMS5568 | AMS5678 | AMS5824 | Mil-S-25043 | QQS766 UNS S17700

Product description

Aerocom Metals carry a full range of sheet and bar in the precipitation hardening 17/7 stainless steel. 17-7 PH contains 17% chromium, 7% nickel and 1% aluminium. It is a precipitation hardening steel capable of reaching very high strength and hardness without any loss of corrosion resist­ance. Surface scaling and distortion in heat treatment is eliminated by its ability to be treated at very low temperatures. In the annealed condition, it has excellent ductility and machine­ability. It retains remarkable mechanical and physical properties at temperatures up to 800° F.

SS 17/7 PH is a precipitation hardenable stainless steel that is formable and also capable of meeting high strength requirements. It is utilised in applications that require both high strength and good corrosion resistance. The alloy is classified as semi-austenitic to distinguish the soft phase (austenite) available for ease of forming from the high strength phase (martensite) usually achieved by heat treatment.

The alloy can be formed from the annealed temper but due to a rapid work hardening rate may not be deep drawn without intermediate annealing. It is joined by most arc and resistance methods used for stainless steel. It should not be fusion welded unless shielded by inert gas to prevent oxidation of aluminium.

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
AMS5528 Steel, Corrosion-Resistant, Sheet, Strip, and Plate 17Cr - 7.1Ni - 1.1Al Solution Heat Treated, Precipitation Hardenable 12/01/1953
AMS5529 Steel, Corrosion Resistant, Sheet and Strip 17Cr - 7.1Ni - 1.1Al Solution Heat Treated and Cold Rolled, Precipitation Hardenable 0.0015 to 0.100 inch (0.038 to 2.54 mm) Nominal Thickness 01/05/1954
AMS5678 Steel, Corrosion Resistant, Wire 17Cr - 7.1NI - 1.1Al Cold Drawn, Precipitation-Hardenable 01/06/1975
AMS5644 Steel, Bars and Forgings, Corrosion Resistant 17Cr - 7Ni - 1Al 01/05/1954
AMS5824 Steel, Corrosion-Resistant, Welding Wire 17Cr - 7.1Ni - 1.0Al 01/11/1969
AMS5568 Steel, Corrosion and Heat Resistant, Welded Tubing 17Cr - 7.1Ni - 1.1Al Solution Heat Treated, Precipitation-Hardenable 01/05/1954

Grade 17-7 PH stainless steel is widely used in the industry due to its attractive combination of properties including very high spring-like strength, good ductility, and excellent corrosion resistance.

Technical Data

Mechanicals Chemistry
SpecificationTensile StrengthYield StrengthElongation
AMS5528150 KSI Max65 KSI Max20% Min
AMS5529200 KSI Max175 KSI Max1% Min
AMS5678280 KSI Max
AMS5644170 KSI Min140 KSI Min6% Min
AMS5568150 KSI Max55 KSI Max20% Min
Element Lower %Upper %
Carbon-0.090
Manganese-1.000
Silicon-1.000
Phosphorus-0.040
Sulfur-0.030
Chromium16.00018.000
Molybdenum--
Columbium (Niobium)--
Titanium--
Aluminium0.7501.500
Cobalt--
Copper--
Nickel6.5007.750

Aerocom Stock List

Sheet & Plate
Sheet Size (Inches)
Thickness (Inches)60" x 36"
0.020X
0.032X
0.040X
0.050X
0.063X
0.080X
0.100X
0.125X
0.250X

Our Approvals

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

Other Information