invar 36 (uns k93600/k93603, w.nr. 1.3912)

15-5PH Round Bar UNS S15500 Precipitation Hardening Stainless Steel Bar

Extremely high strength after heat treatment
Excellent corrosion resistance in mild environments
Superior toughness compared to 17-4PH in certain conditions
Good fatigue resistance and stress corrosion resistance

15-5PH UNS S15500 Precipitation Hardening Stainless Steel Bar)

15-5PH Round Bar, also known as UNS S15500 stainless steel bar, is a high-strength precipitation hardening stainless steel designed for applications requiring a combination of high strength, good corrosion resistance, and excellent mechanical performance.

Compared with traditional stainless steels, 15-5PH round bar offers improved toughness and transverse properties, making it an ideal high strength stainless steel round bar for aerospace, marine, and industrial engineering applications.

Key Features of 15-5PH Stainless Steel Round Bar

15-5PH stainless steel bar is widely used in high-performance engineering environments:

Extremely high strength after heat treatment
Excellent corrosion resistance in mild environments
Superior toughness compared to 17-4PH in certain conditions
Good fatigue resistance and stress corrosion resistance
Excellent dimensional stability during heat treatment
Suitable for precision machining and engineering parts
Ideal precipitation hardening stainless steel round bar for structural use

Chemical Composition (UNS S15500 / 15-5PH)

Chromium (Cr): 14.0 – 15.5%
Nickel (Ni): 3.5 – 5.5%
Copper (Cu): 2.5 – 4.5%
Carbon (C): ≤ 0.07%
Manganese (Mn): ≤ 1.0%
Silicon (Si): ≤ 1.0%
Niobium + Tantalum (Nb+Ta): 0.15 – 0.45%

This composition provides a strong balance of strength and corrosion resistant stainless steel bar performance.

Mechanical Properties (Typical – H900 Condition)

Tensile Strength: up to 1100 – 1310 MPa
Yield Strength: up to 1000 – 1170 MPa
Hardness: up to 38 – 44 HRC
Excellent fatigue and stress resistance
High strength-to-weight ratio

Product Specifications

We supply high-quality 15-5PH round bar stock for industrial and aerospace applications:

Diameter: 5mm – 300mm (custom sizes available)
Length: 1000mm / 3000mm / 6000mm / custom cut
Surface Finish: Black, Peeled, Turned, Polished
Standards: ASTM A564 / ASTM A705 / UNS S15500
Condition: Solution annealed / H900 / H1025 / H1150

Applications of 15-5PH Round Bar

15-5PH stainless steel round bar is widely used in high-performance industries:

Aerospace structural components
Aircraft landing gear parts
Marine engineering equipment
Oil and gas valve components
Pump shafts and high-load fasteners
Nuclear and energy industry parts
Precision mechanical engineering
High strength corrosion resistant components

It is a preferred material for high strength stainless steel bar supplier solutions in critical industries.

Advantages of 15-5PH Stainless Steel Bar

Compared with standard stainless steels (such as 304/316), 15-5PH offers:

Much higher mechanical strength
Better toughness than many precipitation hardening steels
Good corrosion resistance in atmospheric and mild environments
Excellent dimensional stability after heat treatment
Ideal for lightweight, high-load structural design

It is widely chosen as a high performance stainless steel round bar for aerospace and marine use.

FAQ – 15-5PH Round Bar

1. What is 15-5PH round bar?

15-5PH round bar (UNS S15500) is a precipitation hardening stainless steel that provides high strength and good corrosion resistance after heat treatment.

2. What is 15-5PH stainless steel used for?

It is used in aerospace, marine, oil & gas, nuclear, and high-strength mechanical applications such as shafts, fasteners, and structural components.

3. What is the difference between 15-5PH and 17-4PH?

15-5PH offers improved toughness and transverse properties compared to 17-4PH, especially in high-performance engineering applications.

4. Is 15-5PH stainless steel corrosion resistant?

Yes, it has good corrosion resistance in atmospheric and mild environments, but it is not intended for highly aggressive chloride environments like super duplex steels.