Stainless Steel 17-4PH is a precipitation-hardening martensitic stainless steel renowned for its very high strength, excellent hardness, and good corrosion resistance. Through heat treatment, it achieves exceptional mechanical properties, making it suitable for aerospace, chemical, and heavy-duty industrial applications. Grade 17-4PH is widely used in shafts, fasteners, pump and valve components, and structural machinery parts where durability, wear resistance, and precise dimensional stability are essential. Its combination of high strength and corrosion resistance makes it ideal for high-performance and critical engineering environments.
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.
