SS 17-4PH Round Bars & Rods

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Stainless Steel 17-4PH Explained

Stainless Steel 17-4PH is a precipitation-hardening martensitic stainless steel. To begin with, it is renowned for its very high strength, excellent hardness, and good corrosion resistance. Furthermore, through heat treatment, it achieves exceptional mechanical properties — making it the material of choice for the most demanding aerospace, chemical, and heavy-duty industrial applications.

Why do engineers and designers choose SS 17-4PH for critical components? First and foremost, it delivers an outstanding combination of high strength and corrosion resistance that few other grades can match. In addition, its precipitation-hardening capability allows for precise control of mechanical properties through heat treatment. Moreover, it offers excellent wear resistance and maintains precise dimensional stability even under heavy loads.

Consequently, Stainless Steel 17-4PH is widely used in shafts, fasteners, and pump and valve components. Furthermore, it is also trusted in structural machinery parts and aerospace assemblies. Equally important, its combination of high strength, wear resistance, and dimensional stability makes it the preferred choice for high-performance and critical engineering environments where reliability is paramount.

Need high-strength SS 17-4PH round bars for your demanding 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 17-4PH Bars

SS 17-4PH Stainless Steel Square Bar
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SS 17-4PH Square Bar
  • Precipitation-hardening SS 17-4PH square bars for high-strength use
  • Material specification: UNS S17400 / DIN 1.4542
  • Manufactured in accordance with ASTM A276 and ASME SA276
  • Excellent dimensional accuracy with superior mechanical stability
SS 17-4PH Stainless Steel Hex Bar
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SS 17-4PH Hex Bar
  • SS 17-4PH hex bars engineered for aerospace and tooling components
  • Produced under ASTM A276 stainless steel guidelines
  • Equivalent grades: DIN 1.4542 / UNS S17400
  • Supplied in polished and bright drawn surface finishes
SS 17-4PH Stainless Steel Rectangular Bar
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SS 17-4PH Rectangular Bar
  • High-strength SS 17-4PH rectangular bars for structural assemblies
  • Manufactured as per ASTM A276 / ASME SA276
  • Material grade: UNS S17400 / DIN 1.4542
  • Ideal for precision machining and load-bearing applications
SS 17-4PH Stainless Steel Flat Bar
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SS 17-4PH Flat Bar
  • SS 17-4PH flat bars offering high strength and corrosion resistance
  • Material standard: UNS S17400 stainless steel
  • Produced in compliance with ASTM A276 specifications
  • Available in hot rolled, ground, and polished conditions
SS 17-4PH Stainless Steel Bright Bar
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SS 17-4PH Bright Bar
  • Bright drawn SS 17-4PH bars with superior surface finish
  • Ideal for shafts, fasteners, and precision components
  • Manufactured according to ASTM A276
  • Uniform hardness, straightness, and excellent machinability
SS 17-4PH Stainless Steel Forged Bar
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SS 17-4PH Forged Bar
  • Forged SS 17-4PH bars for demanding mechanical applications
  • Heat treated to achieve high strength and toughness
  • Material: UNS S17400 precipitation hardening stainless steel
  • Used in aerospace, oil & gas, valves, and heavy engineering

17-4PH STAINLESS STEEL ROUND BAR EQUIVALENT GRADES

STANDARD UNS WNR.
SS 17-4PH S17400 1.4542

SPECIFICATION OF STAINLESS STEEL 17-4PH ROUND BAR

Stainless Steel Round Bar Specification ASTM A276 / A479, ASME SA276 / A479
Dimension Standard EN, DIN, JIS, ASTM, BS, ASME, AISI
Size 14 mm – 300 mm
Length 50 mm to 6000 mm
Form Round, Square, Hex (A/F), Rectangle, Billet, Ingot, Forging etc.

CHEMICAL COMPOSITION OF STAINLESS STEEL 17-4PH ROUND BAR

Grade C % P % Si % Ni % Cu % Fe Mn % S % Cr %
17-4PH 0.07 max 0.04 max 1.00 max 3.0 – 5.0 3.0 – 5.0 Balance 1.00 max 0.03 max 15.0 – 17.5

MECHANICAL PROPERTIES OF STAINLESS STEEL 17-4PH ROUND BAR

Tensile Strength (ksi) Yield Strength 0.2% Offset (ksi) Elongation (%) Hardness (Rockwell C)
160 145 5 C35

💡 Practical Difference in Use

Use Stainless Steel 17-4PH Round Bars when: high strength, good corrosion resistance, and excellent hardness are required. SS 17-4PH is a precipitation-hardening martensitic stainless steel that can achieve very high hardness and strength through heat treatment, while maintaining moderate corrosion resistance, making it ideal for aerospace, chemical, and heavy-duty industrial applications. → Example: aerospace components, chemical processing equipment, pump parts, valve stems, shafts, high-strength fasteners, and structural machinery parts.


Heat Treated / Bright Finished Stainless Steel 17-4PH 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 hardness, strength, and wear resistance. → Example: aerospace shafts, precision pump components, CNC machined parts, valve sleeves, structural assemblies, and high-strength industrial fasteners.

Applications of Stainless Steel 17-4PH Round Bars

Stainless Steel 17-4PH 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 17-4PH Round Bars?

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

Choose SS 17-4PH Round Bars when:

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

SS 17-4PH Bright / Ground / Heat Treated Round Bars are preferred when:

  • Precise mechanical properties are required
  • Fine surface finish and tight tolerances are needed
  • High hardness 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 17-4PH Round Bars

SS 17-4PH is preferred in industries where high strength, hardness, corrosion resistance, and dimensional precision are critical.

Aerospace & Defense

Used in aircraft and defense applications requiring high strength and hardness.

Uses

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

Why SS 17-4PH?

High strength and hardness combined with corrosion resistance.

Chemical & Industrial Equipment

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

Uses

Pump shafts, valve stems, chemical process parts.

Why SS 17-4PH?

Corrosion resistance with very high mechanical strength.

Structural & Load-Bearing Components

Used in high-performance structural applications.

Uses

Shafts, beams, CNC machined load-bearing parts.

Why SS 17-4PH?

Excellent toughness, hardness, 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 17-4PH?

High strength, hardness, and smooth surface finish for precision components.

Pump & Valve Manufacturing

Used in durable, corrosion-resistant, high-strength fluid handling components.

Uses

Pump shafts, valve stems, chemical process parts.

Why SS 17-4PH?

Strength, hardness, and corrosion resistance for industrial applications.

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Looking for high-quality Stainless Steel 17-4PH Round Bars & Rods? Fully compliant with ASTM A564 / ASME SA564, ASTM A693 / ASME SA693, and AMS 5643 specifications. Get in touch with us today.

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