17-4 PH Stainless Steel Round Bar: Properties, Specifications and Industrial Buying Guide
17-4 PH Stainless Steel Round Bar 17-4 PH stainless steel is a precipitation-hardening stainless steel developed for applications that require a combination of high strength, hardness and corrosion resistance. Also identified as UNS S17400, this grade is widely considered for demanding engineering components where conventional stainless steel grades may not provide the required mechanical performance.
For manufacturers, engineering companies and procurement professionals, selecting the right 17-4 PH stainless steel round bar involves understanding its material characteristics, heat-treatment condition, applicable specifications and intended application.
Manan Steel & Metals deals in specialty metals and alloys, including 17-4 PH stainless steel. Buyers can enquire about their material requirements by sharing the required dimensions, quantity and specification.
What Is 17-4 PH Stainless Steel?
17-4 PH is a martensitic precipitation-hardening stainless steel. Its name refers broadly to its nominal chromium and nickel content, while PH stands for precipitation hardening.
The material develops its required mechanical properties through a controlled heat-treatment process. Depending on the selected condition, it can offer different combinations of strength, hardness and toughness.
Important grade identification details include:
- Material name: 17-4 PH Stainless Steel
- UNS designation: S17400
- Common material designation: Type 630
- Material family: Precipitation-hardening stainless steel
- Principal alloying elements: Chromium, nickel and copper
The precise composition and properties must be verified against the applicable material specification and supplied material documentation.
Key Properties of 17-4 PH Stainless Steel
17-4 PH is selected for engineering applications where a combination of mechanical strength and corrosion resistance is important.
1. High Mechanical Strength
One of the main reasons manufacturers specify 17-4 PH is its ability to achieve high strength through precipitation-hardening heat treatment.
The required strength level depends on the selected heat-treatment condition. Buyers should specify the required condition rather than ordering only by grade name.
2. Corrosion Resistance
17-4 PH contains chromium, which contributes to its stainless and corrosion-resistant characteristics.
It is used in various industrial environments, but its corrosion performance depends on exposure conditions, surface finish, heat-treatment condition and design. It should not automatically be considered equivalent to highly corrosion-resistant grades in every chemical or marine environment.
3. Hardness and Wear Performance
Appropriate heat treatment can provide high hardness and strength, making the material useful for components exposed to mechanical loading and surface contact.
Actual wear performance depends on the component design, surface condition, lubrication and operating environment.
4. Heat-Treatment Flexibility
17-4 PH can be supplied or processed in different heat-treatment conditions. Commonly referenced conditions include H900, H1025, H1075, H1100 and H1150.
Each condition produces a different balance of mechanical properties. The correct condition should be selected according to the component’s engineering requirements and applicable specification.
5. Machinability and Fabrication
Machining characteristics depend on the material condition. Machining in a solution-treated condition may be considered where subsequent ageing is planned, but the complete manufacturing route must be reviewed before processing.
Fabrication, welding and post-weld treatment require appropriate procedures to maintain the intended material properties.
Common Specifications and Designations
When purchasing 17-4 PH stainless steel, buyers should check the material designation and product-form specification.
| Identification | Description |
|---|---|
| 17-4 PH | Common commercial material designation |
| UNS S17400 | Unified Numbering System designation |
| Type 630 | Common stainless steel designation |
| ASTM A564/A564M | Commonly referenced specification for hot-rolled and cold-finished age-hardening stainless steel bars and shapes |
| ASTM A693 | Specification covering precipitation-hardening stainless steel plate, sheet and strip |
The correct standard depends on the product form and purchase requirements. Do not assume that a bar specification automatically applies to sheet or plate. Confirm the current edition, grade, condition and supplementary requirements before placing an order.
Reference: ASTM International
Heat-Treatment Conditions of 17-4 PH
Heat treatment is a critical part of 17-4 PH material selection because the final properties depend significantly on the ageing condition.
Commonly encountered condition designations include:
- H900: An ageing condition generally associated with very high strength and hardness.
- H1025: An ageing condition offering a different balance of strength and toughness.
- H1075: A higher-temperature ageing condition.
- H1100: Another commonly specified ageing condition.
- H1150: A higher-temperature ageing condition generally selected when a different balance of strength and toughness is required.
These designations refer to ageing temperatures in degrees Fahrenheit. They are not interchangeable material grades.
The appropriate condition should be selected using the relevant specification, engineering design requirements and verified mechanical test results. Buyers should clearly mention the required condition in their enquiry.
For technical background, consult ASTM International and British Stainless Steel Association.
Industrial Applications of 17-4 PH Stainless Steel
17-4 PH stainless steel is used across industries that require high-strength stainless components.
Aerospace and Engineering Components
The grade is considered for selected aerospace and engineering components where strength, dimensional stability and material traceability are important. Suitability must be established against the applicable aerospace specification and approval requirements.
Oil and Gas Equipment
Selected equipment components, fittings and machined parts may use 17-4 PH where the material’s mechanical properties and environmental compatibility meet the design requirements.
It should not be assumed suitable for every oilfield or sour-service environment without checking the relevant standards and operating conditions.
Pumps and Valves
The material is used in certain pump, valve and fluid-handling components where high mechanical strength and corrosion resistance are required.
Industrial Machinery
Machined components, shafts, precision parts and mechanical assemblies may specify 17-4 PH based on their loading, strength and operating requirements.
General Manufacturing
Manufacturers may select this grade for specialised components requiring a precipitation-hardening stainless steel rather than a conventional stainless steel grade.
17-4 PH Stainless Steel Round Bar: What Buyers Should Check
Before purchasing a 17-4 PH round bar, procurement teams should confirm the following details.
1. Required Diameter and Length
Clearly specify the required diameter, cut length, quantity and dimensional tolerances.
2. Heat-Treatment Condition
Mention whether the requirement is for solution-treated material or a particular ageing condition such as H900, H1025 or H1150.
3. Applicable Material Standard
Confirm the applicable ASTM or other agreed specification for the product form.
4. Material Test Certificate
Request the applicable Mill Test Certificate and verify the grade, heat number, chemical analysis and mechanical test results.
5. Surface Finish
Specify whether the requirement is for a hot-finished, cold-finished, peeled, ground or machined surface, as applicable.
6. Traceability
For critical engineering applications, confirm the required heat identification, inspection documentation and traceability arrangements before ordering.
Why Correct Grade and Condition Identification Matters
Two materials can both be identified as 17-4 PH but have different mechanical properties because of their heat-treatment conditions.
For example, a component designed around an H900 condition should not be assumed to perform identically when supplied in H1150. The final material condition must match the design and purchase specification.
This is particularly important for manufacturers purchasing material for machining, component production, pressure-related equipment or other critical engineering applications.
Frequently Asked Questions About 17-4 PH Stainless Steel
1. What is the UNS number of 17-4 PH stainless steel?
The UNS designation for 17-4 PH stainless steel is S17400.
2. Is 17-4 PH the same as stainless steel Type 630?
Type 630 is a commonly used designation for 17-4 PH stainless steel. Buyers should still verify UNS S17400 and the applicable product specification.
3. What are the common heat-treatment conditions of 17-4 PH?
Commonly specified ageing conditions include H900, H1025, H1075, H1100 and H1150. Each produces a different mechanical-property balance.
4. Is 17-4 PH stainless steel corrosion-resistant?
Yes, it offers corrosion resistance due to its chromium content. However, suitability depends on the service environment, surface condition, heat treatment and exposure conditions.
5. Which ASTM standard is used for 17-4 PH round bars?
ASTM A564/A564M is a commonly referenced specification for age-hardening stainless steel bars and shapes. Confirm the exact product requirements and current specification edition.
6. What information should I provide when enquiring about 17-4 PH round bars?
Provide the grade, UNS designation, required heat-treatment condition, diameter, length, quantity, applicable standard and documentation requirements.
Enquire About 17-4 PH Stainless Steel at Manan Steel & Metals
Looking for 17-4 PH stainless steel round bars for your industrial or engineering requirements?
Manan Steel & Metals welcomes enquiries from manufacturers, engineering companies, procurement teams and industrial buyers.
Share your requirements for:
- Material: 17-4 PH Stainless Steel
- UNS designation: S17400
- Product form: Round Bar
- Required diameter and length
- Heat-treatment condition
- Applicable material standard
- Quantity and documentation requirements
Contact Manan Steel & Metals
Website: https://manansteel.com/
Email: sales@manansteel.com
Phone: +91 98198 76962
For product and pricing enquiries, visit our Contact Us page.
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