17-4 PH Stainless Steel Round Bar for High-Strength Industrial Components
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- 17-4 PH Round Bar Supplier in Mumbai
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- 17-4 PH Stainless Steel Bar
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- UNS S17400 Round Bar
- Stainless Steel 630 Round Bar
- 1.4542 Round Bar
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- 17-4 PH H900 Round Bar
- 17-4 PH H1025 Round Bar
- 17-4 PH H1150 Round Bar
- 17-4 PH Stainless Steel Mechanical Properties
- 17-4 PH Stainless Steel Chemical Composition
- 17-4 PH Corrosion Resistance
- 17-4 PH Shaft
- 17-4 PH Valve Components
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- 17-4 PH Aerospace Components
- 17-4 PH Heat Treatment
- 17-4 PH Machining
- 17-4 PH Round Bar Price
- 630 Stainless Steel Round Bar
- UNS S17400 Stainless Steel Bar
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Source 17-4 PH Stainless Steel Round Bar for high-strength industrial applications. Explore UNS S17400, 1.4542, H900, H1150, properties, uses and sourcing.
Suggested URL:https://manansteel.com/17-4-ph-stainless-steel-round-bar-high-strength-applications/
17-4 PH Stainless Steel Round Bar for High-Strength Industrial Components
17-4 PH Stainless Steel Round Bar for High-Strength Applications is used when an engineering component requires a combination of high strength, hardness, corrosion resistance and dimensional stability.
17-4 PH is a precipitation-hardening stainless steel commonly identified as UNS S17400, Type 630, or 1.4542.
Unlike conventional austenitic stainless steels such as 304 and 316, 17-4 PH can be heat treated to achieve substantially higher strength.
That makes it particularly interesting for industrial components subjected to mechanical loading.
The material is used across applications including:
- Aerospace
- Oil and gas
- Chemical processing
- Power generation
- Marine equipment
- Pumps
- Valves
- Shafts
- Fasteners
- Machine components
- High-strength engineering parts
For industrial procurement, however, ordering simply “17-4 PH Round Bar” may not be enough.
The required precipitation-hardening condition can have a major effect on the final properties.
A proper purchase enquiry should therefore identify the required condition, such as H900, H1025, H1075 or H1150, in addition to the grade and product specification.
Table of Contents
- What Is 17-4 PH Stainless Steel Round Bar?
- What Does 17-4 PH Mean?
- What Is UNS S17400?
- Is 17-4 PH the Same as Stainless Steel 630?
- Why Is 17-4 PH Used in Industrial Components?
- 17-4 PH Stainless Steel Chemical Composition
- 17-4 PH Stainless Steel Mechanical Properties
- Understanding 17-4 PH Heat Treatment Conditions
- What Is H900 17-4 PH?
- What Is H1025 17-4 PH?
- What Is H1150 17-4 PH?
- 17-4 PH Corrosion Resistance
- 17-4 PH for Oil and Gas Applications
- 17-4 PH for Aerospace Components
- 17-4 PH for Pumps and Valves
- 17-4 PH Round Bar for Shafts
- 17-4 PH for Marine Applications
- 17-4 PH vs 316 Stainless Steel
- 17-4 PH vs 15-5 PH Stainless Steel
- Is 17-4 PH Difficult to Machine?
- 17-4 PH Round Bar Sizes and Finishes
- 17-4 PH Stainless Steel Specifications
- What to Check Before Buying 17-4 PH Round Bar
- 17-4 PH Round Bar Price Factors
- 17-4 PH Round Bar Supplier in Mumbai
- Frequently Asked Questions
- Request a 17-4 PH Quote
What Is 17-4 PH Stainless Steel Round Bar?
17-4 PH Stainless Steel Round Bar is a circular bar manufactured from a precipitation-hardening martensitic stainless steel.
The name “17-4” refers broadly to the alloy’s chromium and nickel content:
Approximately 17% Chromium
Approximately 4% Nickel
Copper and niobium are also important alloying additions.
The precipitation-hardening mechanism allows the material to develop different combinations of strength, hardness and toughness through controlled heat treatment.
This is one of the reasons 17-4 PH is popular for components that need more strength than conventional stainless steel can provide.
What Does 17-4 PH Mean?
The PH stands for:
Precipitation Hardening
This is the key feature that separates 17-4 PH from many commonly used stainless steels.
The material is first produced in a suitable metallurgical condition and then heat treated to develop the required mechanical properties.
Different aging temperatures produce different property combinations.
Therefore, two pieces of 17-4 PH Round Bar can have the same chemical grade but different mechanical properties depending on their heat-treatment condition.
This is extremely important when purchasing the material for a critical engineering component.
What Is UNS S17400?
UNS S17400 is the Unified Numbering System designation associated with 17-4 PH stainless steel.
Other commonly encountered designations include:
17-4 PH
UNS S17400
Type 630
1.4542
X5CrNiCuNb16-4
The exact designation required should depend on the customer’s drawing and applicable standard.
For international procurement, including the UNS designation in the purchase enquiry can reduce confusion.
Is 17-4 PH the Same as Stainless Steel 630?
Yes, 17-4 PH is commonly identified as Type 630 stainless steel.
Therefore, an industrial search may use several different phrases:
- 17-4 PH Round Bar
- 17-4 Stainless Steel Bar
- Stainless Steel 630 Round Bar
- UNS S17400 Bar
- 1.4542 Round Bar
These searches can refer to the same general alloy family, although the applicable product standard and heat-treatment condition still need to be confirmed.
Why Is 17-4 PH Used in Industrial Components?
The attraction of 17-4 PH is its combination of properties.
Engineers may choose it when they need:
High Strength
The alloy can reach high strength levels through precipitation hardening.
Corrosion Resistance
It provides useful corrosion resistance for many industrial environments.
Hardness
Heat treatment can significantly increase hardness.
Dimensional Stability
The precipitation-hardening process can provide useful dimensional characteristics compared with some alternative high-strength alloys.
Machinability
It can be machined in appropriate conditions before final aging, depending on the manufacturing route.
This combination makes 17-4 PH valuable for components where both mechanical strength and corrosion resistance matter.
17-4 PH Stainless Steel Chemical Composition
Typical composition for 17-4 PH includes:
| Element | Typical Range / Maximum |
|---|---|
| Carbon | Max. 0.07% |
| Manganese | Max. 1.00% |
| Silicon | Max. 1.00% |
| Phosphorus | Max. 0.040% |
| Sulfur | Max. 0.030% |
| Chromium | 15.0–17.5% |
| Nickel | 3.0–5.0% |
| Copper | 3.0–5.0% |
| Niobium + Tantalum | 0.15–0.45% |
| Iron | Balance |
Exact chemical limits depend on the governing specification.
For production procurement, the supplied Material Test Certificate should be checked against the specified standard.
17-4 PH Stainless Steel Mechanical Properties
Mechanical properties vary significantly depending on the aging condition.
Important properties include:
- Tensile strength
- Yield strength
- Elongation
- Reduction of area
- Hardness
- Impact toughness
This is why the phrase “17-4 PH Round Bar” alone does not fully describe the mechanical requirement.
A customer requiring maximum strength may specify one condition, while a customer prioritizing toughness and stress-corrosion performance may select another.
The heat-treatment condition therefore needs to be part of the purchase specification.
Understanding 17-4 PH Heat Treatment Conditions
One of the most important subjects when purchasing 17-4 PH Round Bar is the precipitation-hardening condition.
Common conditions include:
- H900
- H925
- H1025
- H1075
- H1100
- H1150
The number generally relates to the approximate aging temperature in degrees Fahrenheit.
These conditions produce different combinations of:
- Strength
- Hardness
- Toughness
- Ductility
- Corrosion resistance
Therefore, H900 and H1150 should not be treated as interchangeable materials simply because both are 17-4 PH.
What Is H900 17-4 PH?
H900 is one of the most widely recognized aging conditions for 17-4 PH.
It is associated with high strength and hardness.
H900 can therefore be attractive for applications where mechanical strength is a major requirement.
Potential uses include:
- Shafts
- Pins
- High-strength fasteners
- Valve components
- Aerospace hardware
- Machine components
However, maximum strength is not automatically the best engineering choice.
If the application requires greater toughness or a different corrosion-performance balance, another aging condition may be more appropriate.
What Is H1025 17-4 PH?
H1025 is an intermediate aging condition.
Compared with H900, it generally provides a different balance between:
Strength + Hardness + Toughness
This makes it useful when the design does not require the maximum possible strength of the alloy.
For industrial applications, selecting H1025 can therefore be a design decision rather than simply a supplier preference.
What Is H1150 17-4 PH?
H1150 uses a higher aging temperature than H900.
It generally provides lower strength than the highest-strength conditions while improving toughness and ductility.
This can make H1150 attractive for applications where impact resistance and toughness are more important than maximum hardness.
The important point for procurement teams is simple:
Always specify the required aging condition.
17-4 PH Corrosion Resistance
17-4 PH provides useful corrosion resistance in many industrial environments.
It is often considered when engineers require more strength than conventional stainless steel can provide without moving entirely to a nickel-based alloy.
Applications can include:
- Marine equipment
- Chemical equipment
- Oil and gas
- Power generation
- Food-processing equipment
- Aerospace components
However, corrosion performance depends on:
- Heat-treatment condition
- Environment
- Chloride concentration
- Temperature
- Surface condition
- Applied stress
For severe corrosion service, an engineer may need to compare 17-4 PH with nickel alloys such as Inconel or Monel.
17-4 PH for Oil and Gas Applications
Oil and gas equipment can expose components to combinations of:
Pressure + Mechanical Stress + Corrosive Fluids + Temperature
17-4 PH can be considered for selected components where high strength and corrosion resistance are required.
Potential applications include:
- Valve components
- Pump components
- Shafts
- Fasteners
- Bushings
- Wellhead components
- Downhole components
- Instrument components
For sour-service applications, the applicable NACE and project requirements should be reviewed before selecting the alloy and heat-treatment condition.
17-4 PH for Aerospace Components
Aerospace components can require materials that combine:
- High strength
- Corrosion resistance
- Weight efficiency
- Dimensional stability
- Controlled mechanical properties
17-4 PH is used in selected aerospace and aircraft-related applications.
Potential components include:
- Structural hardware
- Shafts
- Landing-gear components
- Fasteners
- Valve components
- Actuator components
Aerospace procurement generally requires strict material traceability and certification.
The exact specification should therefore be stated before ordering.
17-4 PH for Pumps and Valves
Pump and valve components can experience high mechanical loading combined with exposure to fluids.
17-4 PH is frequently considered for:
- Pump shafts
- Valve stems
- Valve components
- Bushings
- Seats
- Fasteners
- Impeller-related components
Its ability to achieve high strength through aging makes it useful for components where deformation or wear needs to be controlled.
17-4 PH Round Bar for Shafts
Round bar is a natural starting form for shaft manufacturing.
17-4 PH can be machined into:
- Pump shafts
- Motor shafts
- Valve stems
- Drive shafts
- Actuator shafts
- Precision pins
- Rotor components
For shaft applications, buyers should consider:
- Diameter
- Straightness
- Surface finish
- Heat-treatment condition
- Machining allowance
- Final hardness
- Required tensile properties
A material supplier should be given the finished shaft requirements wherever possible.
17-4 PH for Marine Applications
Marine equipment often requires a balance between mechanical strength and corrosion resistance.
17-4 PH can be used for selected marine components, particularly where high strength is required.
Potential applications include:
- Marine shafts
- Valve components
- Pump components
- Fasteners
- Structural hardware
However, marine environments can be highly variable.
For severe seawater exposure, alloys such as Monel 400 or suitable nickel alloys may be considered depending on the application.
17-4 PH vs 316 Stainless Steel
One of the most useful comparisons for industrial buyers is 17-4 PH versus 316 stainless steel.
| Property | 17-4 PH | 316 Stainless Steel |
|---|---|---|
| Type | Precipitation-hardening stainless steel | Austenitic stainless steel |
| Strength | Very high after aging | Moderate |
| Hardness | Higher | Lower |
| Corrosion resistance | Good to very good | Very good in many environments |
| Heat treatment | Precipitation hardening | Cannot be hardened by conventional heat treatment |
| Typical application | High-strength components | General corrosion-resistant equipment |
| Relative cost | Higher | Generally lower |
If high mechanical strength is the priority, 17-4 PH may have a major advantage.
If corrosion resistance and fabrication simplicity are more important, 316 may be more appropriate.
17-4 PH vs 15-5 PH Stainless Steel
17-4 PH and 15-5 PH are both precipitation-hardening stainless steels.
They share several characteristics but are not identical.
| Factor | 17-4 PH | 15-5 PH |
|---|---|---|
| UNS | S17400 | S15500 |
| Chromium | Approximately 15–17.5% | Approximately 14–15.5% |
| Nickel | Approximately 3–5% | Approximately 3.5–5.5% |
| Copper | Present | Present |
| Strength | High | High |
| Corrosion resistance | Good | Good |
| Typical use | General high-strength components | Aerospace and precision components |
Material selection should be based on the design requirements and applicable specification rather than assuming the alloys are interchangeable.
Is 17-4 PH Difficult to Machine?
17-4 PH can be machined effectively when the correct condition and machining strategy are used.
Machining performance depends on whether the material is:
- Solution treated
- Aged
- Annealed
- Cold worked
For some manufacturing operations, machining before final aging can be advantageous.
Machining shops should consider:
- Tool material
- Cutting speed
- Feed rate
- Coolant
- Work hardening
- Final heat treatment
The supplier should be informed if the material is intended for precision machining.
17-4 PH Round Bar Sizes and Finishes
17-4 PH Round Bar may be sourced in several forms depending on supplier capability:
- Hot rolled
- Cold finished
- Bright
- Ground
- Forged
- Machined
- Cut-to-length
Available diameters and lengths vary according to stock and manufacturing route.
For a quotation, provide:
Diameter: ___ mm
Length: ___ mm
Quantity: ___ kg / pieces
Condition: H900 / H1025 / H1150 / Other
Finish: ___
Specification: ___
This allows the supplier to identify the correct material.
17-4 PH Stainless Steel Specifications
Common specifications associated with 17-4 PH include:
- ASTM A564
- ASTM A693
- ASTM F899
- ASME SA564
- AMS 5643
- UNS S17400
- Type 630
- EN 10088-3
- 1.4542
The applicable standard depends on the product form and application.
For example, ASTM A564 covers hot-rolled and cold-finished age-hardening stainless steel bars and shapes.
Therefore, the purchase order should specify the exact standard required rather than simply stating “17-4 PH.”
What to Check Before Buying 17-4 PH Round Bar
Before purchasing, confirm:
1. Grade
17-4 PH / Type 630.
2. UNS
S17400.
3. Standard
ASTM / ASME / AMS / EN / customer specification.
4. Heat-Treatment Condition
H900, H1025, H1150 or other specified condition.
5. Diameter
Required diameter and tolerance.
6. Length
Standard, random or cut length.
7. Finish
Bright, ground, forged or machined.
8. Testing
Tensile, hardness, chemistry or additional testing where required.
9. Certification
Material Test Certificate.
10. Traceability
Heat number and material identification.
This information can prevent a technically incorrect material from being ordered.
17-4 PH Round Bar Price Factors
A search for “17-4 PH Round Bar price per kg” can produce different results because specialty stainless-steel pricing is specification dependent.
Important factors include:
- Diameter
- Quantity
- Heat-treatment condition
- Finish
- Origin
- Certification
- Testing
- Cutting
- Packaging
- Delivery
For example, an H900 precision-finished bar with certification and custom cutting can have a different price from a standard-stock bar.
Therefore, industrial buyers should request a quotation against the complete specification.
17-4 PH Round Bar Supplier in Mumbai
For buyers searching for a 17-4 PH Round Bar Supplier in Mumbai, availability is only one part of the purchasing decision.
For industrial applications, buyers should also confirm:
- Correct UNS designation
- Required standard
- Heat-treatment condition
- Dimensions
- Material certification
- Testing
- Traceability
- Delivery schedule
Manan Steel & Metals supplies stainless steel and specialty alloy products for industrial requirements.
For a quotation, send:
17-4 PH + UNS S17400 + specification + diameter + length + quantity + condition
This provides the information required to evaluate the requirement correctly.
Frequently Asked Questions
What is 17-4 PH Stainless Steel Round Bar?
17-4 PH Round Bar is a precipitation-hardening stainless steel bar used for applications requiring high strength, hardness and corrosion resistance.
What is the UNS number of 17-4 PH?
The UNS designation is S17400.
What is the equivalent of 17-4 PH stainless steel?
17-4 PH is commonly associated with UNS S17400, Type 630 and 1.4542.
What does PH mean in 17-4 PH?
PH means precipitation hardening, referring to the heat-treatment process used to develop the alloy’s high-strength properties.
What is H900 17-4 PH?
H900 is a precipitation-hardening condition that provides a high-strength combination of properties.
What is H1150 17-4 PH?
H1150 is a higher-temperature aging condition that generally provides greater toughness and ductility compared with the highest-strength aging conditions.
Is 17-4 PH stronger than 316 stainless steel?
Yes, 17-4 PH can achieve substantially higher strength than 316 stainless steel through precipitation hardening.
Is 17-4 PH corrosion resistant?
Yes. It offers useful corrosion resistance, although the performance depends on the environment and heat-treatment condition.
Is 17-4 PH suitable for shafts?
Yes. 17-4 PH Round Bar is used for various shaft, pin and actuator components where high strength is required.
Is 17-4 PH suitable for oil and gas?
It can be used for selected oil and gas components, subject to the applicable service environment and project requirements.
What is 17-4 PH Round Bar price?
Price depends on diameter, quantity, heat-treatment condition, finish, certification, testing and delivery requirements.
Where can I buy 17-4 PH Round Bar in Mumbai?
Manan Steel & Metals supplies 17-4 PH and other specialty steel products for industrial requirements. Contact the company with the required specification for availability and quotation.
Request a 17-4 PH Round Bar Quote
Send your requirement in this format:
Material: 17-4 PH Stainless Steel
UNS: S17400
Type: 630
Werkstoff: 1.4542
Specification: __________
Condition: H900 / H1025 / H1150 / Other
Diameter: __________ mm
Length: __________ mm
Quantity: __________ kg / pieces
Finish: __________
Testing: __________
MTC: Required / Not Required
Delivery Location: __________
Contact Manan Steel & Metals
Email: sales@manansteel.com
Mumbai: +91 98198 76962
Telephone: +91 22 6639 4901
Address:
Shop No. 2, Hira Building,
97 Khetwadi Main Road,
Nanubhai Desai Road, Girgaon,
Mumbai – 400004, Maharashtra, India.
Conclusion
17-4 PH Stainless Steel Round Bar for High-Strength Applications occupies an important position between conventional stainless steels and more expensive nickel-based alloys.
Its major advantage is the ability to obtain high mechanical strength through precipitation hardening while retaining useful corrosion resistance.
This combination makes 17-4 PH relevant to industrial components such as shafts, valve stems, pump components, fasteners, aerospace hardware and other mechanically loaded parts.
For procurement teams, however, the most important detail is the heat-treatment condition.
H900, H1025 and H1150 are not simply different commercial names for the same material. They represent different property balances and should be selected according to the engineering requirement.
A technically complete purchase enquiry should therefore state:
17-4 PH + UNS S17400 + applicable standard + heat-treatment condition + dimensions + quantity + testing requirements.
This is particularly important when the material is being purchased for aerospace, oil and gas, marine or high-load engineering applications.
The cheapest 17-4 PH Round Bar is not necessarily the best option if it does not meet the required condition, certification or mechanical properties.
For companies sourcing 17-4 PH Round Bar in Mumbai or elsewhere in India, Manan Steel & Metals can evaluate requirements based on grade, dimensions, quantity and condition.
Send the complete specification when requesting a quotation so that the material can be matched to the actual engineering requirement.
Suggested Images
Image 1 — Hero Image
Image prompt:
Professional industrial photography of 17-4 PH stainless steel round bars stacked in a modern alloy-steel warehouse, polished metallic surfaces, dimensional markings, engineering procurement environment, realistic, premium industrial look.
ALT: 17-4 PH Stainless Steel Round Bar supplier in Mumbai
Image 2 — Heat Treatment
17-4 PH round bars undergoing controlled industrial heat treatment.
ALT: 17-4 PH stainless steel heat treatment H900
Image 3 — Machining
CNC machining of a 17-4 PH round bar into a precision shaft.
ALT: 17-4 PH Round Bar machining
Image 4 — Aerospace
Precision 17-4 PH components used in an aerospace engineering environment.
ALT: 17-4 PH stainless steel aerospace components
Image 5 — Inspection
Engineer performing dimensional inspection on a 17-4 PH stainless steel bar.
ALT: UNS S17400 Round Bar quality inspection
Suggested Outbound Technical Links
Use authoritative technical sources rather than random directory websites.
ASTM A564 — Age-Hardening Stainless Steel Bars and Shapes
ASTM A564 Standard
ATI — 17-4 PH Stainless Steel Technical Information
ATI 17-4 PH Stainless Steel
Suggested placement:
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Once the other articles are live, connect this page with:
- Inconel 625 Round Bar
- Monel 400 Round Bar
- A286 Round Bar
- Titanium Round Bar
- Nickel Alloy Round Bar
- Stainless Steel Round Bar
- Hastelloy Round Bar
- 4140 Round Bar
For example:
Engineers comparing 17-4 PH with nickel-based alloys may also want to evaluate our [Inconel 625 Round Bar] page.
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For marine applications where corrosion resistance is the primary consideration, buyers can also compare Monel 400 Round Bar.
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