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17-7PH

17-7PH (UNS S17700) is a precipitation-hardening stainless steel known for its high strength and good corrosion resistance. It is commonly used in applications requiring high tensile strength and fatigue resistance, such as aerospace components, automotive parts, and industrial machinery. This alloy meets various standards including AMS 5528, DIN/EN 1.4568, JIS SUS 632J1, and AISI 631, reflecting its versatility and reliability in demanding environments.

Composition
  • Aluminum (Al): Min 0.75%, Max 1.50%
  • Manganese (Mn): Max 1.00%
  • Phosphorus (P): Max 0.05%
  • Silicon (Si): Max 1.00%
  • Nickel (Ni): Min 6.75%, Max 7.75%
  • Sulfur (S): Max 0.03%
  • Carbon (C): Max 0.09%
  • Chromium (Cr): Min 16.00%, Max 18.00%
Properties
  • Density: Approximately 8.0 g/cm³.
  • Thermal Conductivity: ~16 W/m·K.
  • Tensile Strength: High tensile strength due to precipitation hardening.
  • Corrosion Resistance: Good resistance to oxidation and corrosion in various environments.
  • Hardness: Typically Rockwell C 35 to 45, depending on heat treatment.
Applications
  • 17-7PH is used for structural components and aerospace applications where high strength and resistance to corrosion are essential.
Advantages
  • High Strength: Excellent strength-to-weight ratio due to precipitation hardening.
  • Corrosion Resistance: Good performance in various corrosive environments.
  • Versatility: Suitable for a wide range of applications due to its mechanical properties.
Limitations
  • Cost: Higher cost compared to some other stainless steels due to alloying and processing.
  • Machinability: More difficult to machine compared to standard stainless steels due to its hardness.

15-5PH

15-5PH (UNS S15500) is a precipitation-hardening stainless steel known for its excellent combination of high strength, toughness, and corrosion resistance. This alloy is often used in aerospace, chemical processing, and other high-performance applications where durability and resistance to stress are essential. It meets various standards including AMS 5862, DIN/EN 1.4545, and AMS 5659, confirming its suitability for demanding environments.

Composition
  • Chromium (Cr): Min 14.0%, Max 15.0%
  • Manganese (Mn): Max 1.0%
  • Phosphorus (P): Max 0.03%
  • Silicon (Si): Max 1.0%
  • Nickel (Ni): Min 3.5%, Max 5.5%
  • Oxygen (O): Max 0.45%
  • Carbon (C): Max 0.07%
  • Iron (Fe): Balance
Properties
  • Density: Approximately 7.8 g/cm³.
  • Thermal Conductivity: ~17.8 W/m·K.
  • Tensile Strength: High tensile strength due to precipitation hardening.
  • Corrosion Resistance: Good resistance to oxidation and corrosion.
  • Hardness: Typically Rockwell C 35 to 45, depending on heat treatment.
Applications
  • Utilized for critical structural components and aerospace parts that require high strength and resistance to stress corrosion.
Advantages
  • High Strength: Excellent strength and hardness due to precipitation hardening.
  • Corrosion Resistance: Good resistance to a wide range of corrosive environments.
  • Toughness: Good toughness and impact resistance.
Limitations
  • Cost: Higher cost compared to some other stainless steels due to alloying and processing.
  • Machinability: Can be difficult to machine due to its high hardness.

17-4PH

17-4PH (UNS S17400) is a precipitation-hardening stainless steel known for its high strength, hardness, and excellent corrosion resistance. It is commonly used in aerospace, marine, and chemical processing applications where both mechanical properties and resistance to environmental factors are crucial. The alloy conforms to various standards, including AMS 5604, DIN/EN 1.4542, and JIS SUS 630, reflecting its versatility and reliability in demanding environments.

Composition
  • Copper (Cu): Min 3.00%, Max 5.00%
  • Manganese (Mn): Max 1.00%
  • Phosphorus (P): Max 0.04%
  • Silicon (Si): Max 1.00%
  • Nickel (Ni): Min 3.00%, Max 5.00%
  • Carbon (C): Max 0.07%
  • Sulfur (S): Max 0.03%
  • Chromium (Cr): Min 15.00%, Max 17.50%
  • Iron (Fe): Balance
Properties
  • Density: Approximately 7.8 g/cm³.
  • Thermal Conductivity: ~16 W/m·K.
  • Tensile Strength: High tensile strength due to precipitation hardening.
  • Corrosion Resistance: Good resistance to corrosion and oxidation.
  • Hardness: Typically Rockwell C 30 to 40, depending on heat treatment.
Applications
  • Utilized in critical aerospace components like landing gear, turbine blades, and structural parts due to its high strength and corrosion resistance.
Advantages
  • High Strength: Excellent strength and hardness due to precipitation hardening.
  • Corrosion Resistance: Good performance in corrosive environments.
  • Toughness: Good toughness and impact resistance.
Limitations
  • Cost: Higher cost due to complex alloying and processing.
  • Machinability: Can be difficult to machine due to its hardness.

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