Leading 17-7PH Stainless Steel Supplier | AISI 631 Sheet, Strip, Coil & Foil in Stock
Certified AMS 5528 / ASTM A693 / UNS S17700 Precipitation Hardening Stainless Steel
As a professional (AISI 631) 17-7PH stainless steel supplier, Huaxiao Metal provides high-quality 17-7PH stainless steel sheets, strips, coils, and foils. This chromium-nickel-aluminum precipitation-hardening steel is engineered for aerospace and high-fatigue industrial applications, offering exceptional strength, hardness, and fatigue resistance. Our 17-7PH products meet rigorous AMS 5528 and ASTM A693 standards, ensuring superior performance in precision springs, diaphragms, and retaining rings.
We provide:
- Standards: Fully compliant with AMS 5528, ASTM A693, and MIL-S-25043.
- Processing: Precision slitting, custom thickness (0.01mm – 5.0mm), and narrow-width strip processing.
- Global Logistics: Export-ready packaging with fast worldwide shipping (CIF/FOB).
- In-Stock Inventory: Massive stock of various tempers (Condition A, C, CH900).
Available Sizes
Thickness Range
- Foil: 0.01mm – 0.1mm
- Strip: 0.1mm – 3.0mm
- Sheet: 3.0mm – 50mm
Width Range
- Narrow strip slitting available
- Custom widths supported
Surface Finish Options
We can supply:
- 2B Finish
- BA Finish
- Precision Rolled Surface
- Bright Annealed
- Custom Surface Processing
Available Products
Huaxiao Metal supplies:
17-7PH Stainless Steel Sheet
Suitable for:
- Aerospace components
- Structural parts
- Precision fabrication
17-7PH Stainless Steel Strip
Widely used for:
- Flat springs
- Precision stampings
- Retaining rings
17-7PH Stainless Steel Foil
Ideal for:
- Diaphragms
- Electronic components
- Precision instruments
17-7PH Stainless Steel Coil
Suitable for continuous production and automated processing.
Heat Treatment Conditions of 17-7PH
One of the biggest advantages of 17-7PH stainless steel is its ability to achieve different performance levels through heat treatment.
Condition A
- Best formability
- Suitable for deep drawing and stamping
TH1050
- Balanced strength and toughness
- Common industrial condition
RH950
- Excellent fatigue resistance
- Widely used for aerospace springs
CH900
- Maximum hardness and strength
- Ideal for high-load applications
Precision Processing Services
Huaxiao Metal provides:
- Precision slitting
- Cut-to-length
- Surface polishing
- Protective film coating
- Custom packaging
Quality Control
All 17-7 PH stainless steel materials are strictly inspected before shipment.
We support:
- PMI testing
- Mechanical testing
- Surface inspection
- Hardness testing
- EN 10204 3.1 Mill Test Certificate
Export Packaging
We use export-standard packaging for global transportation:
- Waterproof packaging
- Wooden pallets
- Protective edge guards
- PVC film protection
Suitable for sea freight, air freight, and container transportation.
What Is 17-7PH Stainless Steel?
17-7PH stainless steel (UNS S17700) is a precipitation hardening stainless steel known for its:
- High strength
- Excellent fatigue resistance
- Good corrosion resistance
- Superior spring properties
- Excellent formability in Condition A
- Minimal distortion after heat treatment
Compared with traditional stainless steels like 301 or 304, 17-7PH offers significantly higher strength and better elastic recovery, making it ideal for precision spring and aerospace applications.
Why Engineers Choose 17-7PH Stainless Steel
| Feature | Engineering Benefit |
|---|---|
| Excellent Fatigue Strength | Ideal for springs and cyclic loading |
| High Yield Strength | Better load-bearing performance |
| Excellent Elastic Recovery | Superior spring performance |
| Good Corrosion Resistance | Longer service life |
| Heat Treatable | Adjustable hardness and strength |
| Low Distortion After Aging | Ideal for precision components |
| Good Formability in Condition A | Easier stamping and forming |
17-7PH Stainless Steel Specifications
| Standard | Value |
|---|---|
| UNS | S17700 |
| ASTM/AISI | ASTM A693 AISI631 |
| AMS | AMS 5528 / AMS 5529 |
| EN | 1.4568 |
| Type | Precipitation Hardening Stainless Steel |
Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 16.00 – 18.00 |
| Nickel (Ni) | 6.50 – 7.75 |
| Aluminum (Al) | 0.75 – 1.50 |
| Carbon (C) | ≤ 0.09 |
| Manganese (Mn) | ≤ 1.00 |
| Silicon (Si) | ≤ 1.00 |
Mechanical Properties
| Condition | Tensile Strength | Yield Strength | Hardness |
|---|---|---|---|
| Condition A | Moderate | Moderate | Lower |
| TH1050 | High | High | Increased |
| RH950 | Very High | Very High | High |
| CH900 | Maximum | Maximum | Highest |
17-7PH Stainless Steel Applications
Aerospace Springs
17-7PH stainless steel is widely used in aerospace spring applications due to its excellent fatigue resistance and dimensional stability.
Retaining Rings & Washers
High elastic recovery makes 17-7PH ideal for retaining rings and locking components.
Precision Diaphragms
Thin foil versions provide excellent flexibility and stable mechanical performance.
Aircraft Structural Components
High strength-to-weight ratio supports lightweight aerospace structures.
Industrial Flat Springs
Excellent cyclic loading resistance ensures long service life.
Electronic & Precision Components
Used in sensors, precision instruments, and electronic hardware.
17-7PH vs 301 Stainless Steel
| Property | 17-7PH | 301 Stainless Steel |
|---|---|---|
| Strength | Much Higher | Lower |
| Fatigue Resistance | Excellent | Good |
| Heat Treatable | Yes | No |
| Spring Performance | Superior | Standard |
| Aerospace Usage | Extensive | Moderate |
For high-performance spring applications, engineers often choose 17-7PH over 301 stainless steel.
17-7PH vs 17-4PH Stainless Steel
| Property | 17-7PH | 17-4PH |
|---|---|---|
| Main Advantage | Spring Performance | Structural Strength |
| Formability | Better | Moderate |
| Fatigue Resistance | Excellent | Good |
| Typical Applications | Springs & Diaphragms | Shafts & Valves |
| Elastic Recovery | Superior | Lower |
If your application requires high elasticity and cyclic fatigue resistance, 17-7PH is usually the better choice.
Why Buy from Huaxiao Metal
| Advantage | Details |
|---|---|
| Industry Experience | 15+ Years |
| Regular Inventory | 2000+ Tons |
| Export Markets | 60+ Countries |
| Quote Response | Within 6–24 Hours |
| Standards | AMS / ASTM / EN |
| Processing Service | Slitting / Cut-to-Length |
| Certificates | EN 10204 3.1 MTC |
| MOQ | Flexible |
17-7PH Stainless Steel: FAQ
What forms of 17-7PH stainless steel do you supply?
We supply 17-7PH stainless steel sheet, strip, coil, foil, and precision strip.
What standards can you provide?
We can supply materials according to AMS 5528, ASTM A693, UNS S17700, and other international standards.
What thickness range is available?
Thickness can range from ultra-thin foil to heavy plate depending on the product form and application requirements.
Do you provide custom sizes?
Yes. Custom width, thickness, surface finish, and slitting services are available.
What are the typical heat treatment conditions for 17-7PH?
17-7PH is versatile due to its multiple heat treatment options:
Condition A (Annealed): The material is soft and ready for fabrication.
Condition TH1050: Hardened to a high tensile strength through austenite conditioning and transformation.
Condition RH950: Offers higher strength than TH1050 via sub-zero cooling.
Condition CH900: Cold-worked and aged, providing the highest strength and hardness for spring-tempered parts.
Can you provide Mill Test Certificates?
Yes. EN 10204 3.1 Mill Test Certificates are available upon request.
What industries use 17-7PH stainless steel?
17-7PH is widely used in aerospace, spring manufacturing, precision stamping, industrial hardware, and electronic components.
What surface finishes are available?
We can provide 2B, BA, bright annealed, precision rolled, and customized surface finishes.
Is 17-7PH stainless steel magnetic?
In the Annealed (Condition A) state, 17-7PH is primarily austenitic and exhibits weak or no magnetism. However, once it is heat-treated to hardened conditions (like TH1050 or RH950) or cold-worked, it undergoes a phase transformation to martensite and becomes strongly magnetic.
Do you support international shipping?
Yes. We export stainless steel materials to customers worldwide with export-standard packaging.
Does Huaxiao Metal provide 17-7PH samples and certifications?
Yes. As a professional manufacturer and exporter with 15+ years of experience, Huaxiao Metal provides:
Full Mill Test Reports (MTRs) according to ASTM/AMS standards.
Custom Sizing: Precision slitting for coils and laser-cutting for sheets.
Samples: Free samples are available for quality verification upon request.
Request a Quote for 17-7PH Stainless Steel
- Fast quotation
- Technical support
- Flexible MOQ
