17-7PH UNS S17400 Chromium Powder Properties and Applications

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# 17-7PH UNS S17400 Chromium Powder Properties and Applications

17-7PH UNS S17400 chromium powder is a high-performance material known for its excellent mechanical properties and corrosion resistance. This precipitation-hardening stainless steel powder is widely used in various industries due to its unique combination of strength, durability, and formability.

## Chemical Composition

The chemical composition of 17-7PH chromium powder plays a crucial role in its properties:

– Chromium (Cr): 16-18%
– Nickel (Ni): 6.5-7.75%
– Aluminum (Al): 0.75-1.5%
– Carbon (C): ≤0.09%
– Manganese (Mn): ≤1.0%
– Silicon (Si): ≤1.0%
– Phosphorus (P): ≤0.04%
– Sulfur (S): ≤0.03%

## Physical Properties

17-7PH chromium powder exhibits several notable physical properties:

– Density: 7.8 g/cm³
– Melting Point: 1400-1450°C (2552-2642°F)
– Thermal Conductivity: 16.3 W/m·K
– Electrical Resistivity: 0.82 μΩ·m
– Magnetic Permeability: Slightly magnetic in hardened condition

## Mechanical Properties

The mechanical properties of 17-7PH powder can be enhanced through heat treatment:

– Tensile Strength: 1035-1240 MPa (150-180 ksi)
– Yield Strength: 965-1170 MPa (140-170 ksi)
– Elongation: 5-7%
– Hardness: 40-45 HRC (after heat treatment)
– Fatigue Strength: Excellent

## Heat Treatment

17-7PH chromium powder responds well to heat treatment processes:

– Solution Annealing: 1038°C (1900°F) followed by rapid cooling
– Precipitation Hardening: 510-593°C (950-1100°F) for 1-4 hours
– Cold Working: Can be performed before aging to increase strength

## Applications

17-7PH chromium powder finds applications in various industries:

### Aerospace Industry

– Aircraft components
– Fasteners and springs
– Structural parts

### Medical Industry

– Surgical instruments
– Implantable devices
– Dental equipment

### Industrial Applications

– Chemical processing equipment
– Oil and gas components
– High-strength fasteners

### Other Uses

– Watch springs
– High-performance springs
– Pressure vessels

## Advantages of 17-7PH Chromium Powder

The material offers several advantages over other stainless steel powders:

– Excellent corrosion resistance
– High strength-to-weight ratio
– Good fatigue resistance
– Maintains properties at elevated temperatures
– Can be heat treated to achieve desired properties
– Good formability in annealed condition

## Manufacturing Processes

17-7PH chromium powder is used in various manufacturing processes:

– Powder metallurgy
– Metal injection molding (MIM)
– Additive manufacturing (3D printing)
– Thermal spraying
– Cold spraying

## Conclusion

17-7PH UNS S17400 chromium powder is a versatile material that combines excellent mechanical properties with good corrosion resistance. Its ability to be heat treated for specific applications makes it valuable across multiple industries. As manufacturing technologies advance, the use of this high-performance powder is expected to grow in applications requiring strength, durability, and precision.