SS 15-5PH Round Bars & Rods

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Stainless Steel 15-5PH Explained

Stainless Steel 15-5PH is a precipitation-hardening martensitic stainless steel. To begin with, it is renowned for its excellent combination of high strength, toughness, and corrosion resistance. Furthermore, it can be heat treated to achieve superior mechanical properties while maintaining moderate hardness and dimensional stability — making it highly versatile for critical engineering applications.

Why do engineers and manufacturers choose SS 15-5PH for high-performance components? First and foremost, it offers an exceptional balance of strength and toughness that outperforms many other stainless steel grades. In addition, its precipitation-hardening capability allows for precise control of mechanical properties through heat treatment. Moreover, it provides excellent corrosion resistance comparable to many austenitic grades.

Consequently, Stainless Steel 15-5PH is widely used in aerospace components, chemical processing equipment, and pump and valve parts. Furthermore, it is also trusted in structural assemblies and high-performance industrial applications. Equally important, its versatility, dimensional stability, and reliable performance under mechanical stress and corrosive environments make it the preferred choice for demanding engineering challenges.

Need high-performance SS 15-5PH round bars for your critical application? Contact our technical team today — we’ll help you select the right size, heat treatment condition, and specifications for your requirements, and provide a competitive quote tailored to your needs.

Other Types of Stainless Steel 15-5PH Bars

SS 15-5PH Stainless Steel Square Bar
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SS 15-5PH Square Bar
  • Precipitation hardening stainless steel 15-5PH square bars
  • Material grade: UNS S15500 / DIN 1.4545
  • Manufactured as per ASTM A276 and ASME SA276
  • Excellent strength, toughness, and dimensional precision
SS 15-5PH Stainless Steel Hex Bar
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SS 15-5PH Hex Bar
  • Hexagonal bars in SS 15-5PH for aerospace and engineering use
  • Produced under ASTM A276 stainless steel specifications
  • Equivalent grades: DIN 1.4545 / UNS S15500
  • Available in polished and bright drawn surface finishes
SS 15-5PH Stainless Steel Rectangular Bar
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SS 15-5PH Rectangular Bar
  • SS 15-5PH rectangular bars with high mechanical strength
  • Manufactured according to ASTM A276 / ASME SA276
  • Grade classification: UNS S15500 / DIN 1.4545
  • Suitable for structural and precision machined components
SS 15-5PH Stainless Steel Flat Bar
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SS 15-5PH Flat Bar
  • 15-5PH flat bars offering high strength-to-weight ratio
  • Material standard: UNS S15500 stainless steel
  • Produced as per ASTM A276 guidelines
  • Available in hot rolled, polished, and ground condition
SS 15-5PH Stainless Steel Bright Bar
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SS 15-5PH Bright Bar
  • Bright drawn SS 15-5PH bars with smooth surface finish
  • Ideal for machining, shafts, and high-precision parts
  • Manufactured as per ASTM A276 standards
  • Ensures straightness, uniformity, and consistent hardness
SS 15-5PH Stainless Steel Forged Bar
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SS 15-5PH Forged Bar
  • Forged SS 15-5PH bars for high-load engineering applications
  • Heat treated to achieve superior strength and toughness
  • Material: UNS S15500 precipitation hardening stainless steel
  • Widely used in aerospace, valves, shafts, and defense parts

15-5PH STAINLESS STEEL ROUND BAR EQUIVALENT GRADES

STANDARD UNS WNR.
SS 15-5PH S15500 1.4545

SPECIFICATION OF STAINLESS STEEL 15-5PH ROUND BAR

Standard ASTM A276 / A479, ASME SA276 / SA479
Dimension Standard EN, DIN, JIS, ASTM, BS, ASME, AISI
Size 14 mm – 300 mm
Length 1 to 6 Meters, Custom Cut Length
Form Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging

CHEMICAL COMPOSITION OF STAINLESS STEEL 15-5PH ROUND BAR

Grade C % Cr % Ni % Cu % Mn % Si % P % S % Cb+Ta % Fe
15-5PH 0.07 max 14.0 – 15.5 3.5 – 5.5 2.5 – 4.5 1.00 max 1.00 max 0.040 max 0.030 max 0.15 – 0.45 Balance

MECHANICAL PROPERTIES OF STAINLESS STEEL 15-5PH ROUND BAR

Condition Tensile Strength ksi (MPa) Yield Strength 0.2% ksi (MPa) Elongation % Hardness (Rockwell C)
H900 (Typical) 160 (1100) 140 (965) 7 – 8 38 – 44 HRC

💡 Practical Difference in Use

Use Stainless Steel 15-5PH Round Bars when: high strength, excellent corrosion resistance, moderate hardness, and good toughness are required. SS 15-5PH is a precipitation-hardening martensitic stainless steel that can be heat treated to achieve high strength while maintaining corrosion resistance, making it ideal for aerospace, chemical, and structural applications. → Example: aircraft components, chemical processing equipment, pump parts, valve stems, shafts, structural machinery parts, and high-strength fasteners.


Heat Treated / Bright Finished Stainless Steel 15-5PH Round Bars when: precise mechanical properties, consistent surface finish, and dimensional stability are required for high-performance components. Bright drawn or ground bars ensure tight tolerances and smooth surfaces, while aging or heat treatment enhances strength, toughness, and wear resistance. → Example: aerospace shafts, precision pump components, CNC machined parts, valve sleeves, structural assemblies, and high-strength fasteners.

Applications of Stainless Steel 15-5PH Round Bars

Stainless Steel 15-5PH round bars are widely used in aerospace, chemical, structural, and precision equipment industries where high strength, corrosion resistance, and dependable mechanical properties are essential.

  • Aerospace & Defense: Shafts, fasteners, structural components, high-strength assemblies.
  • Chemical & Industrial: Pumps, valves, reactors, corrosion-resistant machinery parts.
  • Precision & Structural Applications: CNC components, load-bearing shafts, wear-resistant parts.

When to Choose Stainless Steel 15-5PH Round Bars?

The selection mainly depends on required strength, corrosion resistance, surface finish, dimensional accuracy, and toughness.

Choose SS 15-5PH Round Bars when:

  • High strength and good corrosion resistance are needed
  • Moderate to high hardness is required
  • Durability in structural or load-bearing applications is important
  • Components operate in chemical, aerospace, or industrial settings
  • Good toughness and polishability are needed
  • Used in high-performance or structural equipment

SS 15-5PH Bright / Ground / Heat Treated Round Bars are preferred when:

  • Precise mechanical properties are required
  • Fine surface finish and tight tolerances are needed
  • High strength and wear resistance are critical
  • Polished or visible parts are required
  • Stable dimensional accuracy is essential
  • Used in aerospace, chemical, or precision assemblies

Industries That Use Stainless Steel 15-5PH Round Bars

SS 15-5PH is preferred in industries where high strength, corrosion resistance, toughness, and dimensional precision are critical.

Aerospace & Defense

Used in aircraft and defense applications requiring high strength.

Uses

Shafts, fasteners, structural components, high-strength assemblies.

Why SS 15-5PH?

High strength combined with corrosion resistance and toughness.

Chemical & Industrial Equipment

Used in chemical and industrial machinery exposed to corrosion and load.

Uses

Pump shafts, valve stems, chemical process parts.

Why SS 15-5PH?

Corrosion resistance with high mechanical strength.

Structural & Load-Bearing Components

Used in high-performance structural applications.

Uses

Shafts, beams, CNC machined load-bearing parts.

Why SS 15-5PH?

Excellent toughness and dimensional stability under stress.

Precision & CNC Components

Used in finely machined and polished assemblies.

Uses

CNC shafts, precision fasteners, wear-resistant parts.

Why SS 15-5PH?

High strength, precision, and smooth surface finish.

Pump & Valve Manufacturing

Used in durable and corrosion-resistant fluid handling components.

Uses

Pump shafts, valve stems, chemical processing parts.

Why SS 15-5PH?

Strength and corrosion resistance for industrial applications.

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