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Alloy 17-7PH a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment.
Alloy 17-7PH provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 315°C (600°F ).
Corrosion Resistance
17-7PH stainless steel provides corrosion resistance in conditions TH 1050 and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431, but is not quite as good as chromium-nickel Type 304. Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.
Chemical composition of 17-7PH(AMS 5528 / AMS 5529/ AMS 5644)
Cr | 16.0-18.0 |
Ni | 6.5-7.75 |
Mn | 1.00max |
C | 0.09max |
Si | 1.0max |
P | 0.04max |
S | MAX0.03 |
Mechanical Properties of 17-7PH(AMS 5528 / AMS 5529/ AMS 5644)
Material | Tensile strength(ksi) | Yield strength(KSI) | Elongation (% MIN.) | Hardness MAX |
17-7ph≤0.010inch thick | 150 | 65 | - | - |
17-7PH ≥0.010inch thick | 150 | 55 | 20 | 92 |
Weldability
The precipitation hardening class of stainless steel is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to achieve optimum mechanical properties by considering the best heat-treated conditions in which to weld and which heat treatments should follow welding. This particular alloy is generally considered to have poorer weldability compared to the most common alloy of this stainless class, 17-4 PH stainless steel. A major difference is the high Al content of this alloy, which degrades penetration and enhances weld slag formation during arc welding. Also, the austenite conditioning and precipitation hardening heat treatments are both required after welding to achieve high strength levels. When a weld filler is needed, 17-7 PH is most often specified.
Our services
We can cut and bend steel plate according to customer's requriement or drawing,
packaging according to customers' request.
Application
1. applications requiring good strength, corrosion resistance and mechanical properties up to 800 F in service.
2. used for very detailed, intricate parts due to its low distortion in heat treatment.
3. commonly found in a variety of springs and washers.
Alloy 17-7PH a precipitation hardening stainless steel that provides high strength and hardness, excellent fatigue properties, good corrosion resistance, good formability, and minimum distortion upon heat treatment.
Alloy 17-7PH provides valuable property combinations particularly well suited for aerospace applications. This special alloy also provides benefits for other applications requiring high strength and good corrosion resistance, as well as excellent properties for flat springs at temperatures up to 315°C (600°F ).
Corrosion Resistance
17-7PH stainless steel provides corrosion resistance in conditions TH 1050 and RH 950 is generally superior to that of the standard hardenable chromium types of stainless steels such as Types 410, 420 and 431, but is not quite as good as chromium-nickel Type 304. Corrosion resistance in Condition CH 900 approaches that of Type 304 in most environments.
Chemical composition of 17-7PH(AMS 5528 / AMS 5529/ AMS 5644)
Cr | 16.0-18.0 |
Ni | 6.5-7.75 |
Mn | 1.00max |
C | 0.09max |
Si | 1.0max |
P | 0.04max |
S | MAX0.03 |
Mechanical Properties of 17-7PH(AMS 5528 / AMS 5529/ AMS 5644)
Material | Tensile strength(ksi) | Yield strength(KSI) | Elongation (% MIN.) | Hardness MAX |
17-7ph≤0.010inch thick | 150 | 65 | - | - |
17-7PH ≥0.010inch thick | 150 | 55 | 20 | 92 |
Weldability
The precipitation hardening class of stainless steel is generally considered to be weldable by the common fusion and resistance techniques. Special consideration is required to achieve optimum mechanical properties by considering the best heat-treated conditions in which to weld and which heat treatments should follow welding. This particular alloy is generally considered to have poorer weldability compared to the most common alloy of this stainless class, 17-4 PH stainless steel. A major difference is the high Al content of this alloy, which degrades penetration and enhances weld slag formation during arc welding. Also, the austenite conditioning and precipitation hardening heat treatments are both required after welding to achieve high strength levels. When a weld filler is needed, 17-7 PH is most often specified.
Our services
We can cut and bend steel plate according to customer's requriement or drawing,
packaging according to customers' request.
Application
1. applications requiring good strength, corrosion resistance and mechanical properties up to 800 F in service.
2. used for very detailed, intricate parts due to its low distortion in heat treatment.
3. commonly found in a variety of springs and washers.
