Stainless Steel 17-4PH Sheets & Plates

What are Stainless Steel 17-4PH Sheets & Plates?

Stainless Steel 17-4PH sheets and plates are precipitation-hardening martensitic stainless steel flat products designed to offer a combination of high strength, hardness, and corrosion resistance.

17-4PH (also known as UNS S17400) achieves its high strength through heat treatment (aging process) while maintaining good toughness and dimensional stability. It is one of the most widely used precipitation-hardening stainless steels.

Key Functions:

• Provide high strength and hardness
• Offer corrosion resistance in various environments
• Maintain dimensional stability during heat treatment
• Enable precision machining and fabrication

Chemical Composition of Stainless Steel 17-4PH

SS 17-4PH has a balanced composition that enhances strength and corrosion resistance.

Typical Composition:

• Chromium (Cr): 15% – 17.5%
• Nickel (Ni): 3% – 5%
• Copper (Cu): 3% – 5%
• Niobium (Nb + Ta): 0.15% – 0.45%
• Carbon (C): ≤ 0.07%
• Manganese (Mn): ≤ 1%
• Silicon (Si): ≤ 1%
• Iron (Fe): Balance

Copper enables precipitation hardening, while chromium provides corrosion resistance.

Key Features of SS 17-4PH Sheets & Plates

Stainless Steel 17-4PH offers several advantages:

• High Strength and Hardness (Through Heat Treatment)
• Excellent Corrosion Resistance
• Superior Mechanical Properties
• Good Toughness
• Excellent Fatigue Resistance
• Dimensional Stability During Heat Treatment
• Good Machinability and Fabrication
• Long Service Life in Critical Applications

Mechanical Properties

SS 17-4PH provides outstanding mechanical performance depending on heat treatment condition:

• Tensile Strength: ~900–1310 MPa
• Yield Strength: ~725–1170 MPa
• Elongation: ~10–15%
• Hardness: High

These properties make it suitable for high-stress applications.

Physical Properties

• Density: ~7.75 g/cm³
• Melting Range: ~1400–1440°C
• Modulus of Elasticity: ~200 GPa
• Thermal Conductivity: ~18 W/m•K
• Thermal Expansion: Moderate

Corrosion Resistance

SS 17-4PH sheets and plates offer good resistance to:

• Atmospheric corrosion
• Mild chemical environments
• Industrial exposure
• Stress corrosion cracking

While not as corrosion-resistant as 316, it performs well in many applications.

Heat Treatment

17-4PH requires precipitation hardening to achieve optimal strength.

Heat Treatment Process:

• Solution Annealing: ~1020–1040°C
• Aging (H900, H1025, H1150 conditions): ~480–620°C

Different aging temperatures provide varying strength and toughness levels.

Weldability

SS 17-4PH offers good weldability.

Welding Methods:

• TIG (GTAW)
• MIG (GMAW)

Best Practices:

• Preheat generally not required
• Post-weld heat treatment recommended
• Use compatible filler materials

Machinability

• Good machinability in solution-annealed condition
• Harder after aging
• Use sharp tools
• Maintain proper speeds and coolant

Standards & Specifications

SS 17-4PH sheets and plates are manufactured according to:

• ASTM A693 – Precipitation hardening stainless steel
• ASTM A564
• AMS 5604 / AMS 5643
• ASME SA693

These standards ensure quality and reliability.

Sizes & Specifications

• Thickness: 0.5 mm to 100 mm
• Width: Up to 2000 mm
• Length: Custom sizes available

Surface Finish Options:

• 2B Finish
• BA (Bright Annealed)
• No.1 Finish
• Polished Finish

Applications of Stainless Steel 17-4PH Sheets & Plates

SS 17-4PH sheets and plates are widely used in high-performance industries:

• Aerospace Industry Used in structural components and aircraft parts.
• Oil & Gas Industry Used in valves, fittings, and high-pressure equipment.
• Power Plants Used in turbine components and shafts.
• Marine Industry Used in moderately corrosive environments.
• Chemical Processing Used in high-strength applications.

Quality Testing & Inspection

Each sheet and plate undergoes strict quality control:

• Chemical composition testing
• Mechanical testing
• Dimensional inspection
• Surface quality testing
• Positive Material Identification (PMI)

Mill Test Certificates (MTC) and third-party inspection reports are provided.

Packaging & Delivery

• Export-grade packaging
• Protective wrapping to prevent damage
• Proper labeling and traceability
• Safe and timely global delivery

Why Choose Virami Steel Hub?

• Trusted stainless steel supplier in Mumbai
• Wide range of high-performance grades
• Competitive pricing
• Custom solutions available
• Compliance with international standards
• Strong export network
• Dedicated customer support

Conclusion

Stainless Steel 17-4PH Sheets & Plates are a high-strength, precipitation-hardening solution ideal for industries requiring excellent mechanical properties, corrosion resistance, and durability. Their versatility and reliability make them suitable for critical and high-performance applications.

With a commitment to quality and precision, Virami Steel Hub delivers SS 17-4PH sheets and plates that ensure long-term performance, efficiency, and value.