17-4 PH H1025 Material Properties
Overview
17-4 PH H1025 is a type of precipitation-hardening stainless steel that is widely used in various industries due to its excellent mechanical properties, corrosion resistance, and weldability. This alloy is a modified version of the 17-4 PH alloy, with a slightly different chemical composition that provides improved machinability and formability.
Chemical Composition
The chemical composition of 17-4 PH H1025 is as follows:
- Carbon (C): 0.07 max
- Manganese (Mn): 1.00 max
- Phosphorus (P): 0.040 max
- Sulfur (S): 0.030 max
- Silicon (Si): 1.00 max
- Chromium (Cr): 15.50 - 17.50
- Nickel (Ni): 3.00 - 5.00
- Copper (Cu): 3.00 - 5.00
- Niobium (Nb): 0.15 - 0.45
Physical Properties
The physical properties of 17-4 PH H1025 are as follows:
- Density: 7.96 g/cm³
- Melting Point: 1425 - 1450°C (2600 - 2640°F)
- Specific Heat: 500 J/kg°C
- Thermal Conductivity: 16.3 W/m°C
- Electrical Resistivity: 700 ohm-cm
Mechanical Properties
The mechanical properties of 17-4 PH H1025 are as follows:
- Tensile Strength: 620 - 860 MPa (90 - 125 ksi)
- Yield Strength: 510 - 690 MPa (74 - 100 ksi)
- Elongation: 10 - 15%
- Hardness: 30 - 40 HRC
- Impact Strength: 30 - 50 J
Corrosion Resistance
17-4 PH H1025 has excellent corrosion resistance in various environments, including:
- Aqueous Solutions: resistant to corrosion in saltwater, acid, and alkaline solutions
- Atmospheric Environments: resistant to corrosion in marine, rural, and industrial atmospheres
- High-Temperature Environments: resistant to oxidation and scaling up to 600°C (1110°F)
Applications
17-4 PH H1025 is widely used in various industries, including:
- Aerospace: engine components, fasteners, and other structural components
- Chemical Processing: equipment and components exposed to corrosive environments
- Marine Hardware: marine fasteners, propeller shafts, and other underwater equipment
- Oil and Gas: downhole equipment, pipelines, and other components exposed to corrosive environments
Heat Treatment
17-4 PH H1025 can be heat-treated to achieve optimal mechanical properties. The recommended heat treatment process involves:
- Solution Annealing: heat to 1040°C (1900°F) and quench in water or oil
- Precipitation Hardening: heat to 480°C (900°F) and hold for 1 hour, followed by air cooling
Conclusion
17-4 PH H1025 is a versatile and reliable material that offers excellent mechanical properties, corrosion resistance, and weldability. Its applications are diverse, ranging from aerospace to oil and gas, and its heat treatment process can be tailored to achieve optimal properties.
