| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier 17-7PH
Austenitic-martensitic precipitation hardening stainless steel
17-7PH is an austenitic-martensitic precipitation hardening stainless steel developed on the basis of 18-8CrNi, also known as controlled phase transformation stainless steel.
Chinese name: 17-7PH
Chinese grade: 07Cr17Ni7Al
Chemical composition: C Si Mn Al
Properties: Austenitic-martensitic precipitation hardening stainless steel
Name: Precipitation hardening stainless steel
Standard: AISI, ASTM
Model: 17-7PH(631)
UNS number: S17700
Basic Information
After solution treatment, it is an unstable austenite structure with good plastic toughness and workability. After adjustment, the austenite precipitation carbide composition changes, and then after martensitic transformation, most of the structure is transformed into toughness. Better low-carbon tempered martensite, this state is the use state of steel, and has good mechanical properties at medium temperature. Corrosion resistance is better than general martensitic stainless steel.
Chemical composition:
Carbon (C)≤0.09,Manganese (Mn)≤1.00, Nickel (Ni) 6.50~7.75, Silicon (Si)≤1.00, Phosphorus (P)≤0.035, Sulfur (S)≤0.030, Chromium (Cr) 16.00~ 18.00, aluminum (Al) 0.75~1.50
Chinese brand: 07Cr17Ni7Al 0Cr17Ni7Al
Physical properties of 17-7PH:
Density: 7.65g/cm³
Melting point: 1415-1450ºC
17-7PH alloy has the following characteristics:
Hardened stainless steel, high strength, high hardness, fatigue resistance, good corrosion resistance, good die forging.
17-7PH application areas:
For aerospace, chemical, petrochemical, paper and metal processing.
Japan SUS631 (17-7PH National Standard 0cr17Ni7al) is a dispersion hardening stainless steel with high strength, high hardness, fatigue resistance, corrosion resistance, good forging properties, and less deformation at high temperature. It is especially suitable for the aerospace field. This special alloy is also suitable for Other areas with high strength and corrosion resistance requirements. When the high temperature reaches 316ºC, the spring performance is still very good. SUS631 is used in aerospace, chemical, petrochemical, paper and metal processing industries.
Mechanical properties
δb (MPa) tensile strength: solid solution, ≤1030; aging at 565ºC, ≥1140; aging at 510ºC, ≥1230.
Yield strength under 0.2(MPa) condition: solid solution, ≤380; aging at 565ºC, ≥960; aging at 510ºC, ≥1030.
5(%) Elongation: solid solution, ≥20; aging at 565ºC, ≥5; aging at 510ºC, ≥4.
The section shrinkage rate is 565ºC, ≥25; 510ºC, ≥10.
Hardness: solid solution, ≤229HB; aging at 565ºC, ≥363HB; aging at 510ºC, ≥388HB.
The application of superalloys in the civil industry is also more and more extensive. Superalloys have important applications in gas turbines, automotive turbochargers, nuclear power, petroleum and petrochemical industries. The advancement of industrialization and the development of domestic high-end equipment manufacturing will continue to drive the demand for superalloys in the civilian industry. At present, civilian superalloys account for 20% of the total demand, and this proportion is expected to continue to increase in the future.
Heat Treatment Specifications
Heat treatment specification:
1) Solid solution, rapid cooling at 1000~1100°C; 2) Aging at 565°C, 760±15°C for 90min, cooling to below 15°C within 1 hour, 30min, then heated to 565±10°C for 90min, air cooling; 3) 510 ºC aging, 955±10ºC for 10min, air-cooled to room temperature and cooled to -73±6ºC within 24h.
Microstructure:
The tissue is characterized by precipitation hardening.
delivery status:
Generally, it is delivered in a heat-treated state, and the type of heat-treatment is indicated in the contract; if it is not specified, it is delivered in a non-heat-treated state.
sus631 heat treatment specification and metallographic structure:
Heat treatment specification: 1) Solid solution, rapid cooling at 1000~1100 ºC; 2) Aging at 565 ºC, after solid solution, keep at 760 ± 15 ºC for 90 min, cool to below 15 ºC within 1 hour, 30 min, 565 ± 10 ºC heating to 90 min, air cooling ; 3) Aging at 510ºC, keep at 955±10ºC for 10min after solid solution, cool down to -73±6ºC within 24h in air to room temperature.
Metallographic structure: the organizational characteristics of precipitation hardening.
Delivery status: Generally, it is delivered in a heat-treated state, and the type of heat-treatment is indicated in the contract; if it is not specified, it is delivered in a non-heat-treated state.
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