17-4 PH Stainless Steel Round Bar: Properties, Uses, UNS S17400 & Applications
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Table of Contents
- What Is 17-4 PH Stainless Steel Round Bar?
- 17-4 PH UNS S17400 Identification
- Why Is It Called 17-4 PH?
- 17-4 PH Stainless Steel Composition
- Key Properties of 17-4 PH Round Bar
- 17-4 PH Heat Treatment and Precipitation Hardening
- 17-4 PH Round Bar Applications
- 17-4 PH vs Conventional Stainless Steel
- What to Check When Buying 17-4 PH Round Bar
- 17-4 PH Round Bar from Manan Steel & Metals
- Frequently Asked Questions
What Is 17-4 PH Stainless Steel Round Bar?
17-4 PH stainless steel round bar is a precipitation-hardening stainless steel supplied in round bar form for demanding engineering and industrial applications.
The material is commonly identified as UNS S17400 and is also known as Type 630 stainless steel.
The term PH refers to precipitation hardening. Through controlled heat treatment, the alloy can develop a combination of high strength and useful corrosion resistance.
17-4 PH is therefore different from conventional austenitic stainless grades that are primarily strengthened through cold working.
The material is used in components where designers need a combination of:
- High mechanical strength
- Good corrosion resistance
- Heat-treatment capability
- Dimensional stability
- Machinability in appropriate conditions
- Industrial durability
For technical reference, buyers can consult ATI’s 17-4 PH stainless steel information and the ASTM International standards database.
17-4 PH UNS S17400 Identification
One of the most important references when purchasing this material is its UNS designation: S17400.
17-4 PH is commonly associated with:
| Identification | Description |
|---|---|
| Common Name | 17-4 PH |
| UNS | S17400 |
| Stainless Type | Type 630 |
| Material Family | Precipitation-hardening stainless steel |
| Common Product Form | Round bar |
| Key Feature | Strength through precipitation hardening |
Depending on the market and specification, buyers may encounter different designations for the same material family.
For this reason, a purchase enquiry should clearly state the required material designation and specification, rather than relying only on the commercial name “17-4 PH.”
Why Is It Called 17-4 PH?
The name 17-4 comes from the approximate chromium and nickel content associated with the alloy:
- Approximately 17% chromium
- Approximately 4% nickel
The “PH” indicates precipitation hardening.
Copper is also an important alloying addition, while other elements are controlled according to the applicable material specification.
This combination gives 17-4 PH its characteristic ability to achieve high strength through appropriate heat treatment.
17-4 PH Stainless Steel Composition
The exact chemical requirements should always be checked against the applicable specification and material certificate.
A representative composition includes chromium, nickel, copper and other controlled alloying elements.
| Element | Typical Role |
|---|---|
| Chromium | Corrosion resistance |
| Nickel | Supports corrosion resistance and structure |
| Copper | Important to precipitation-hardening response |
| Manganese | Controlled alloying element |
| Silicon | Controlled alloying element |
| Carbon | Controlled to specification |
| Niobium/Columbium | Stabilizing/alloying addition |
| Iron | Balance |
The exact permitted composition can vary according to the applicable product specification.
Therefore, engineering procurement should always refer to the relevant standard rather than using an approximate chemistry table as a substitute for certification.
Key Properties of 17-4 PH Round Bar
High Strength
One of the main reasons industries use 17-4 PH is its ability to achieve high mechanical strength through precipitation-hardening heat treatments.
This makes it suitable for components that require greater strength than many conventional corrosion-resistant steels can provide.
Corrosion Resistance
17-4 PH provides useful corrosion resistance for a wide range of industrial environments.
Its corrosion performance is an important reason it is used in engineering components exposed to moisture and industrial service conditions.
However, corrosion resistance depends on the environment, heat-treatment condition, surface condition and application.
Precipitation Hardening
The alloy can be heat treated to develop different strength levels.
This gives engineers flexibility when balancing strength, hardness, toughness and other required properties.
Machinability
17-4 PH can be machined using suitable procedures, with the machining response depending strongly on the material condition.
For manufacturers producing precision components, specifying the initial material condition is therefore important.
Dimensional Stability
The controlled heat-treatment approach makes 17-4 PH useful for applications where strength and dimensional requirements need to be considered together.
17-4 PH Heat Treatment and Precipitation Hardening
Heat treatment is one of the defining characteristics of 17-4 PH stainless steel.
A typical processing route involves solution treatment followed by an aging treatment selected according to the required property level.
The aging condition can significantly influence:
- Yield strength
- Tensile strength
- Hardness
- Ductility
- Toughness
- Dimensional behavior
Common condition designations encountered in 17-4 PH procurement include H900, H1025, H1075, H1150 and related conditions.
These conditions should not be treated as interchangeable.
A buyer ordering 17-4 PH round bar for a machined component should specify the required condition when the engineering drawing or application requires it.
For standards and technical information, refer to ASTM International and the applicable product specification.
17-4 PH Round Bar Applications
17-4 PH stainless steel round bar is used across several engineering sectors.
Aerospace Components
The alloy’s combination of strength and corrosion resistance makes it relevant to selected aerospace components and precision engineering applications.
Oil & Gas Equipment
17-4 PH can be used for selected oil and gas components where mechanical strength and corrosion resistance are required.
Chemical Processing
Components operating in industrial processing environments may use 17-4 PH when its material characteristics are appropriate for the service conditions.
Pumps and Valves
The alloy is commonly considered for:
- Valve components
- Pump components
- Shafts
- Bushings
- Mechanical parts
- High-strength fittings
General Engineering
17-4 PH round bar can be machined into shafts, fasteners, precision components and other engineered parts.
Food and Industrial Equipment
Selected equipment components may use 17-4 PH where corrosion resistance and mechanical strength are important design considerations.
17-4 PH vs Conventional Stainless Steel
17-4 PH should not simply be treated as another general-purpose stainless steel.
Its major distinction is the ability to develop high strength through precipitation-hardening heat treatment.
| Characteristic | 17-4 PH |
|---|---|
| Material Type | Precipitation-hardening stainless steel |
| UNS | S17400 |
| Type | 630 |
| Strength | High strength achievable through aging |
| Heat Treatment | Important part of material performance |
| Corrosion Resistance | Good, application dependent |
| Typical Form | Round bar and other product forms |
| Applications | Aerospace, oil & gas, valves, pumps, engineering |
The appropriate material should be selected according to the operating environment, required mechanical properties, fabrication method and applicable specification.
What to Check When Buying 17-4 PH Round Bar
Before purchasing 17-4 PH stainless steel round bar, provide the supplier with complete technical information.
1. Material Designation
Specify:
17-4 PH / UNS S17400 / Type 630
where applicable.
2. Diameter
Mention the exact required diameter in millimetres.
3. Length
State whether you require:
- Standard length
- Fixed length
- Cut-to-size material
4. Quantity
Specify the required number of pieces, total kilograms or total quantity.
5. Heat-Treatment Condition
If your drawing or application specifies H900, H1025, H1075, H1150 or another condition, mention it clearly.
6. Applicable Standard
State the required ASTM, AMS or other specification where applicable.
7. MTC Requirement
If a Material Test Certificate is required, mention it before quotation.
8. Delivery Location
Providing the destination allows the supplier to prepare more accurate commercial information.
17-4 PH Round Bar from Manan Steel & Metals
Manan Steel & Metals supplies 17-4 PH round bar for industrial procurement requirements.
Our team can review requirements based on:
- 17-4 PH material
- UNS S17400
- Type 630
- Required diameter
- Required length
- Quantity
- Heat-treatment condition
- Applicable specification
- MTC/documentation requirements
- Delivery location
For a focused enquiry, buyers should provide the complete requirement instead of requesting only a general “17-4 PH price.”
You can also explore our dedicated 17-4 PH Round Bar Supplier India page for additional product information.
Frequently Asked Questions
What is 17-4 PH stainless steel?
17-4 PH is a precipitation-hardening stainless steel commonly identified as UNS S17400 and Type 630.
What is the UNS number of 17-4 PH?
The UNS designation is S17400.
What does PH mean in 17-4 PH?
PH means precipitation hardening, referring to the heat-treatment process used to develop high strength.
Is 17-4 PH the same as Type 630?
17-4 PH is commonly identified as Type 630 stainless steel and UNS S17400. The exact specification should still be confirmed for the product being purchased.
What are common 17-4 PH round bar applications?
Applications include selected aerospace components, oil and gas equipment, pumps, valves, shafts, mechanical components and general industrial engineering.
What are H900 and H1150?
H900 and H1150 are examples of precipitation-hardening/aging conditions used for 17-4 PH. Different aging conditions produce different combinations of strength, hardness and toughness.
Can 17-4 PH round bar be supplied with an MTC?
Yes, MTC requirements can be specified during procurement. The certificate should be checked against the applicable specification and purchase requirement.
How do I request a quotation for 17-4 PH round bar?
Provide the diameter, length, quantity, UNS/material designation, heat-treatment condition, applicable specification, MTC requirement and delivery location.
Conclusion
17-4 PH stainless steel round bar is a precipitation-hardening stainless material used where a combination of high strength, corrosion resistance and heat-treatment capability is required.
For procurement, the important details are not limited to the material name. UNS S17400, Type 630, dimensions, heat-treatment condition, applicable specification and documentation should be clearly defined.
Manan Steel & Metals supplies 17-4 PH round bar for industrial requirements and can review enquiries based on the required size, quantity and specification.
Contact Manan Steel & Metals for your 17-4 PH round bar requirement.
Manan Steel & Metals
Shop No. 2, Hira Building, 97 Khetwadi Main Road,
Girgaon, Mumbai – 400004, Maharashtra, India
Phone: 7977369869
Email: manansteel@gmail.com
Website: https://www.manansteel.com/