Stainless Steel 15-5PH Sheets & Plates

What are Stainless Steel 15-5PH Sheets & Plates?

Stainless Steel 15-5PH sheets and plates are precipitation-hardening martensitic stainless steel flat products designed to provide a combination of high strength, toughness, and corrosion resistance.

15-5PH is an improved version of 17-4PH with enhanced toughness and better transverse properties. It achieves high strength through heat treatment (aging process) while maintaining dimensional stability.

Key Functions:

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

Chemical Composition of Stainless Steel 15-5PH

SS 15-5PH has a controlled composition that enhances strength and toughness.

Typical Composition:

• Chromium (Cr): 14% – 15.5%
• Nickel (Ni): 3.5% – 5.5%
• Copper (Cu): 2.5% – 4.5%
• Niobium (Nb): 0.15% – 0.45%
• Carbon (C): ≤ 0.07%
• Manganese (Mn): ≤ 1%
• Silicon (Si): ≤ 1%
• Iron (Fe): Balance

Copper and niobium contribute to precipitation hardening and improved strength.

Key Features of SS 15-5PH Sheets & Plates

Stainless Steel 15-5PH offers several advantages:

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

Mechanical Properties

SS 15-5PH provides excellent mechanical performance depending on heat treatment condition:

• Tensile Strength: ~930–1300 MPa
• Yield Strength: ~725–1100 MPa
• Elongation: ~10–15%
• Hardness: High

These properties make it ideal for high-stress and high-load applications.

Physical Properties

• Density: ~7.8 g/cm³
• Melting Range: ~1400–1440°C
• Modulus of Elasticity: ~200 GPa
• Thermal Conductivity: ~18 W/m•K
• Thermal Expansion: Moderate

Corrosion Resistance

SS 15-5PH 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 environments.

Heat Treatment

15-5PH is a precipitation-hardening alloy that requires heat treatment.

Heat Treatment Process:

• Solution Annealing: ~1038°C
• Aging (Precipitation Hardening): ~480–620°C

Different aging temperatures provide different strength levels.

Weldability

SS 15-5PH 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 15-5PH sheets and plates are manufactured according to:

• ASTM A693 – Precipitation hardening stainless steel
• AMS 5659
• ASME SA693

These standards ensure quality and global acceptance.

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 15-5PH Sheets & Plates

SS 15-5PH 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.
• Chemical Processing Used in high-strength applications.
• Power Plants Used in turbine components.
• Marine Industry Used in moderately corrosive environments.

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 15-5PH Sheets & Plates are a high-strength, precipitation-hardening solution ideal for industries requiring excellent mechanical properties, toughness, and reliability. Their ability to maintain strength and dimensional stability makes them suitable for critical applications.

With a strong focus on quality and performance, Virami Steel Hub delivers SS 15-5PH sheets and plates that ensure durability, efficiency, and long-term value.