17-4 PH Round Bar Properties, Grades, Applications & Buying Guide
SEO Title: 17-4 PH Round Bar Properties: Powerful Guide for Industrial Buyers
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SEO Meta Description: Explore 17-4 PH Round Bar properties, grades, chemical composition, heat treatment, applications and buying considerations. Get 17-4 PH Round Bar from Manan Steel & Metals.
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Table of Contents
- What Is 17-4 PH Round Bar?
- Why 17-4 PH Is Chosen for Industrial Components
- Key Properties of 17-4 PH Round Bar
- 17-4 PH Equivalent Grades
- Chemical Composition
- Mechanical Properties
- 17-4 PH Heat Treatment Conditions
- Applications of 17-4 PH Round Bar
- 17-4 PH vs Conventional Stainless Steel
- How to Select the Right 17-4 PH Round Bar
- Why Buy from Manan Steel & Metals?
- Frequently Asked Questions
- Request a Quote
What Is 17-4 PH Round Bar?
17-4 PH Round Bar is a precipitation-hardening stainless steel used for engineering components that require a combination of high strength, hardness and corrosion resistance.
The material is commonly identified as UNS S17400, Type 630 and Werkstoff 1.4542.
The term “PH” stands for precipitation hardening. Unlike conventional stainless steels where strength is primarily obtained from the alloy structure and processing, 17-4 PH can be strengthened through controlled heat treatment and ageing.
This gives manufacturers an important advantage.
The same basic grade can be processed into different strength and toughness conditions depending on the requirements of the finished component.
For buyers, this means that simply asking for “17-4 PH Round Bar” may not be enough.
The diameter, length, finish, material condition and applicable specification can all influence whether the supplied material is suitable for the job.
Why Is 17-4 PH Chosen for Industrial Components?
Industrial manufacturers are often faced with a difficult material-selection decision.
A component may need to withstand significant mechanical loads while also operating in an environment where corrosion resistance matters.
This is where 17-4 PH becomes interesting.
The material can provide a useful balance of:
- High tensile strength
- High yield strength
- Good hardness
- Corrosion resistance
- Dimensional stability
- Useful toughness
- Good strength-to-weight ratio
- Machinability in suitable conditions
Its properties can be adjusted through precipitation-hardening treatments, allowing engineers to select an appropriate condition for the intended application.
For technical information about stainless-steel grades and properties, buyers can also refer to Outokumpu Stainless Steel Handbook.
Key Properties of 17-4 PH Round Bar
Understanding the properties of 17-4 PH helps determine where the material makes sense.
High Mechanical Strength
One of the strongest reasons manufacturers consider 17-4 PH is its ability to achieve high mechanical strength after appropriate ageing.
This makes it suitable for components subjected to significant loads.
Corrosion Resistance
17-4 PH contains a high chromium content, giving it useful stainless-steel corrosion resistance.
However, corrosion performance depends on the environment.
Factors such as chloride exposure, temperature, chemicals, surface condition and stress should be considered before selecting the material.
Hardness
Hardness varies according to the heat-treatment condition.
A condition selected for maximum strength will not necessarily be the best choice for an application where toughness is the primary concern.
Dimensional Stability
17-4 PH can provide useful dimensional stability, which is valuable for precision-engineered components.
Machinability
The material can be machined, although machining behaviour changes depending on the condition of the material.
Manufacturers should consider the machining sequence when deciding whether components will be machined before or after final ageing.
17-4 PH Equivalent Grades
One of the common challenges in industrial procurement is finding a material when different standards use different designations.
17-4 PH may be identified as:
| Designation | Material Identification |
|---|---|
| 17-4 PH | Common commercial designation |
| UNS S17400 | UNS designation |
| Type 630 | Stainless steel grade designation |
| 1.4542 | Werkstoff number |
| SUS 630 | Japanese designation |
These names are useful when searching for material internationally.
However, buyers should not assume that every material listed as an “equivalent” is automatically interchangeable.
The applicable specification, chemistry, heat-treatment condition and mechanical requirements must be checked before making a substitution.
For official standards information, ASTM International is a useful reference.
17-4 PH Chemical Composition
The performance of 17-4 PH comes from its carefully controlled alloy chemistry.
Typical Type 630 composition includes:
| Element | Typical Requirement (%) |
|---|---|
| Carbon | 0.07 max |
| Manganese | 1.00 max |
| Silicon | 1.00 max |
| Phosphorus | 0.040 max |
| Sulfur | 0.030 max |
| Chromium | 15.00–17.50 |
| Nickel | 3.00–5.00 |
| Copper | 3.00–5.00 |
| Niobium + Tantalum | 0.15–0.45 |
| Iron | Balance |
The actual chemical composition should always be verified against the material test certificate for the supplied heat.
This is particularly important when purchasing material against a customer’s drawing or technical specification.
17-4 PH Mechanical Properties
The mechanical properties of 17-4 PH depend significantly on the heat-treatment condition.
This is one of the most important factors buyers should understand before placing an order.
For example, specifying only:
“17-4 PH Round Bar required”
does not fully define the material requirement.
The supplier may need to know whether the material is required in:
- Condition A
- H900
- H925
- H1025
- H1075
- H1150
- H1150M
- Another specified condition
Each condition provides a different combination of strength, hardness and toughness.
Therefore, when requesting a quotation, always mention the required condition whenever it is specified by the drawing or application.
17-4 PH Heat Treatment Conditions
Precipitation hardening is the key feature that differentiates this stainless steel from many conventional grades.
Condition A
Condition A refers to the solution-treated condition.
It is commonly used as the starting condition before an ageing treatment.
H900
H900 involves ageing at approximately 900°F (482°C).
This condition is generally selected when very high strength and hardness are important.
H1025
H1025 involves ageing at approximately 1025°F (552°C).
It provides a different balance between strength and toughness.
H1075
The H1075 condition uses an ageing temperature of approximately 1075°F (580°C).
It provides another combination of mechanical properties.
H1150
H1150 involves ageing at approximately 1150°F (621°C).
It is commonly considered where toughness and ductility are more important than maximum achievable strength.
The appropriate condition should always be selected based on the engineering requirement.
More hardness does not automatically mean better performance.
A component subjected to impact or demanding service conditions may require a different property balance from a component where maximum strength is the priority.
Applications of 17-4 PH Round Bar
The combination of strength and corrosion resistance makes 17-4 PH suitable for numerous engineering applications.
Aerospace
17-4 PH can be used for selected aerospace components where the applicable specification permits its use.
Oil & Gas
The material may be used for selected valve components, shafts, fittings and other engineered parts.
Application suitability should always be assessed against the actual operating environment and applicable industry requirements.
Chemical Processing
17-4 PH can be considered for selected chemical-processing components where its mechanical and corrosion properties meet the service conditions.
Marine Engineering
The grade can be useful for selected marine components requiring a combination of strength and corrosion resistance.
Power Generation
Power-generation equipment often contains highly loaded mechanical components.
17-4 PH can be considered for appropriate shafts, fittings and engineered components.
General Engineering
Commonly considered components include:
- Shafts
- Pins
- Bushings
- Valve components
- Pump components
- Gears
- Fasteners
- Machine components
- Precision-engineered parts
The material should always be selected according to the component’s actual service conditions rather than application name alone.
17-4 PH vs Conventional Stainless Steel
A common question from buyers is:
Why purchase 17-4 PH when grades such as 304 or 316 stainless steel are readily available?
The answer depends on what the component needs to do.
304 and 316 are widely used for their corrosion resistance, fabrication characteristics and general-purpose performance.
17-4 PH is considered when higher mechanical strength and hardness are important while retaining useful stainless-steel corrosion resistance.
That makes the grades suitable for different engineering requirements.
For example:
Need general-purpose corrosion resistance and excellent fabrication?
A conventional austenitic stainless steel may be appropriate.
Need significantly higher strength from a precipitation-hardening stainless steel?
17-4 PH may be worth evaluating.
Material selection should always be based on the actual operating environment, loads, temperature, fabrication process and required specification.
How to Select the Right 17-4 PH Round Bar
Before requesting a quotation, prepare the technical details.
1. Grade
17-4 PH / UNS S17400 / Type 630
2. Diameter
Specify the required diameter in millimetres.
3. Length
Mention standard length or required cut length.
4. Heat-Treatment Condition
Specify H900, H1025, H1075, H1150 or the condition mentioned in your drawing.
5. Finish
Mention whether you require bright, polished, ground, rough turned or another finish.
6. Quantity
Provide the number of pieces or total weight.
7. Documentation
Mention if a material test certificate, inspection report or other documentation is required.
8. Delivery Location
Providing the destination helps the supplier calculate logistics accurately.
A detailed enquiry saves time for both the buyer and supplier.
Why Buy 17-4 PH Round Bar from Manan Steel & Metals?
Buying specialty metals is not simply about finding the lowest price per kilogram.
The more important question is:
Will the material supplied actually match my requirement?
At Manan Steel & Metals, we understand that industrial buyers may require specific grades, dimensions, finishes and material conditions.
Our range includes stainless steel, alloy steel, nickel alloys and other engineering materials for industrial requirements.
If you are sourcing 17-4 PH Round Bar, share your requirement with our team.
For example:
Grade: 17-4 PH / UNS S17400
Diameter: 50 mm
Length: 3 metres
Condition: H900
Quantity: 100 kg
Finish: As required
Delivery: Mumbai / other location
The more information you provide, the easier it becomes to work toward the correct material and quotation.
Whether you are purchasing for machining, replacement components, fabrication or industrial production, our team can review your requirement.
Frequently Asked Questions
What is 17-4 PH Round Bar?
17-4 PH Round Bar is a precipitation-hardening stainless steel bar commonly identified as UNS S17400, Type 630 and 1.4542.
Is 17-4 PH the same as UNS S17400?
Yes. UNS S17400 is the UNS designation commonly associated with 17-4 PH stainless steel.
What is 17-4 PH used for?
It is used in selected aerospace, oil and gas, chemical, marine, power-generation and general engineering applications.
What is H900 in 17-4 PH?
H900 is an ageing condition associated with ageing at approximately 900°F (482°C), generally producing a high-strength condition.
What is H1150?
H1150 is an ageing condition using approximately 1150°F (621°C), commonly selected when a different balance of strength, toughness and ductility is required.
Can 17-4 PH be machined?
Yes. It can be machined, although machining conditions depend on the material’s condition and the manufacturing sequence.
Where can I buy 17-4 PH Round Bar in Mumbai?
Manan Steel & Metals supplies specialty stainless steel and engineering materials for industrial requirements. Buyers can contact the company with the required grade, diameter, length, condition and quantity for a quotation.
Request a 17-4 PH Round Bar Quote
When a component requires a combination of strength, hardness and corrosion resistance, choosing the correct stainless steel can make a significant difference to its performance.
17-4 PH offers engineers the flexibility of precipitation hardening while retaining the advantages associated with stainless steel.
If you are looking for 17-4 PH Round Bar in Mumbai or elsewhere in India, send your requirement to Manan Steel & Metals.
Include your:
Diameter + Length + Condition + Quantity + Finish + Specification
and our team can review your requirement and work toward a suitable quotation.
Have a 17-4 PH requirement? Send us the specification and let us help you source the material.
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Recommended External DoFollow Links
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- ASTM International — standards reference
- Outokumpu Stainless Steel Handbook — stainless-steel technical reference
Recommended Images
Image 1
Placement: After introduction
ALT: 17-4 PH Round Bar supplier in Mumbai
Industrial photograph of 17-4 PH stainless steel round bars.
Image 2
Placement: Chemical composition section
ALT: 17-4 PH stainless steel UNS S17400
Close-up of marked or finished 17-4 PH round bar.
Image 3
Placement: Applications section
ALT: 17-4 PH Round Bar industrial applications
Machined industrial components manufactured from precipitation-hardening stainless steel.
Image 4
Placement: Heat-treatment section
ALT: 17-4 PH Round Bar heat treatment H900 H1150
Industrial heat-treatment process or conceptual image showing ageing conditions.
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