AMS 5528 17-7PH Stainless Steel Coil
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What is AMS 5528 17-7PH Stainless Steel Coil?
AMS 5528 17-7PH Stainless Steel Coil (UNS S17700 / 1.4568 / AISI 631) is a high-performance precipitation-hardening stainless steel strip designed specifically for aerospace, precision springs, chemical equipment, and high-strength components.
In the solution-annealed condition (Condition A), 17-7PH Stainless Steel Coil exhibits excellent cold workability, allowing for easy stamping, bending, and forming. After aging treatments such as RH950, TH1050, or CH900, its tensile strength can reach approximately 1300–1800 MPa. This is significantly higher than that of standard 304 stainless steel. Meanwhile, it maintains exceptional fatigue properties, making it ideal for manufacturing springs, retaining rings, aerospace fasteners, and precision mechanical parts that operate under high cyclic loads.
AMS 5528 Stainless Steel Coil Manufacturer
The AMS 5528 17-7PH Stainless Steel Coil supplied by GNEE can be customized in various sizes, conditions, and surface finishes according to customer drawings and engineering requirements. Available heat treatment states include Condition A, CH900, RH950, and TH1050. We support custom processing for thicknesses ranging from approximately 0.03 to 3.0 mm and widths from 10 to 1500 mm, fully meeting the manufacturing needs of precision springs, aerospace parts, electronic stampings, and medical devices.
AMS 5528 17-7PH Coil Specification
| Feature | Technical Details / Specifications |
| Material Grade | 17-7PH (Chromium-Nickel-Aluminum Precipitation Hardening) |
| UNS Designation | UNS S17700 |
| Standard Specification | AMS 5528 (Aerospace Material Specification) |
| Delivery Condition | Condition A (Solution Heat Treated) |
| Product Form | Cold Rolled Coil / Strip / Sheet |
| Thickness Range | 0.05 mm – 4.0 mm (Standard coil thickness) |
| Width Range | 10 mm – 1219 mm (Slitting available) |
| Surface Finish | 2B, Bright Annealed (BA), No. 4 (Brushed) |
AMS 5528 17-7PH stainless steel Chemical Composition
| Element | Weight % (Range/Max) |
| Carbon (C) | 0.09% max |
| Manganese (Mn) | 1.00% max |
| Phosphorus (P) | 0.040% max |
| Sulfur (S) | 0.030% max |
| Silicon (Si) | 1.00% max |
| Chromium (Cr) | 16.00% – 18.00% |
| Nickel (Ni) | 6.50% – 7.75% |
| Aluminum (Al) | 0.75% – 1.50% |
| Iron (Fe) | Balance |
Mechanical Properties (Condition A - As Delivered)
AMS 5528 material is typically supplied in Condition A. In this state, the material is soft and ductile for forming.
| Property | Value (Condition A) |
| Tensile Strength, Ultimate (UTS) | 150 ksi (1035 MPa) max |
| Yield Strength (0.2% Offset) | 55 ksi (380 MPa) max |
| Elongation (in 2 inches) | 20% min (varies by thickness) |
| Hardness (Rockwell) | 92 HRB max |
Heat Treatment & Typical Hardened Properties
After forming in Condition A, 17-7PH can be hardened through a series of heat treatments (Transformation and Precipitation). The two most common hardened conditions are TH1050 and RH950.
| Property | Condition TH1050 | Condition RH950 |
| Tensile Strength (UTS) | 170 ksi (1170 MPa) min | 210 ksi (1450 MPa) min |
| Yield Strength (0.2% Offset) | 140 ksi (965 MPa) min | 190 ksi (1310 MPa) min |
| Hardness (Rockwell C) | 38 HRC min | 44 HRC min |
AMS 5528 17-7PH Stainless Steel Coil applications:
Aerospace Components: Bulkheads, skins, and structural parts.
Springs & Washers: High-strength springs that must operate at temperatures up to 600°F (316°C).
Pressure Diaphragms: Excellent fatigue life in pressure-sensing equipment.
Bellows & Honeycomb Structures: Used in lightweight, high-strength welded panels.
17-7PH Stainless Steel Coil price per kg
The price of 17-7PH stainless steel coils typically ranges from $2.80 to $6.00 per kilogram, depending largely on order volume, thickness, and market conditions. Placing large-volume, direct-from-mill orders with wholesale suppliers can lower the unit price, whereas retail coils or those subjected to precision slitting command relatively higher prices.
If you require specific information, please let us know:
What condition or temper level do you need (e.g., Condition A, CH 900, or TH 1050)?
What are the required thickness and width dimensions?
Quality Control
In terms of quality control, GNEE brings over 18 years of experience in stainless steel exporting. We provide AMS 5528 Standard Mill Test Certificates (MTC), EN 10204 3.1 inspection reports, chemical composition analysis, mechanical property testing, hardness inspections, and support for third-party inspections such as SGS or BV. This ensures comprehensive heat and batch traceability for every single roll of 17-7PH stainless steel strip.
Additionally, GNEE supports BA, 2B, cold-rolled finishes, precision slitting, cut-to-length services, and OEM processing. This comprehensive service helps customers resolve common challenges in sourcing high-strength stainless steel coils, including strict dimensional tolerance control, heat-treatment condition matching, and unpredictable delivery lead times.
Packaging:
Eye-to-sky or Eye-to-wall packing with waterproof paper and wooden pallets for global export.
FAQ
Q: What are the differences between the TH1050 and RH950 heat treatment processes?
A: Both are common hardening processes under the AMS 5528 standard:
TH1050 (TH1050 condition): Ultimate Tensile Strength (UTS) is approximately 170 ksi. This process involves a conditioning treatment at 1400°F followed by aging at 1050°F. It is relatively simple to perform but yields slightly lower strength than the RH950 process.
RH950 (RH950 condition): Ultimate Tensile Strength (UTS) is approximately 210 ksi. This process includes a cryogenic treatment step (-100°F) to ensure complete martensitic transformation, followed by aging at 950°F. It provides the highest strength and fatigue resistance.
Q: Is 17-7PH magnetic?
A: In Condition A (the state in which it is delivered per AMS 5528), the material is primarily non-magnetic (or exhibits only very weak magnetism). However, after heat treatment to the TH or RH condition, the microstructure transforms into martensite, making the material strongly magnetic.
Q: How does 17-7PH compare to 301 stainless steel for spring applications?
A: 301 stainless steel relies solely on cold working (rolling) to achieve spring properties, whereas 17-7PH achieves them through heat treatment.
17-7PH offers superior dimensional stability and higher strength at temperatures up to 600°F (316°C). While 301 is less expensive, it rapidly loses its spring properties at elevated temperatures.
Q: Can AMS 5528 material be welded?
A: Yes. 17-7PH can be welded using common methods such as TIG (Tungsten Inert Gas) or MIG (Metal Inert Gas) welding. However, as it is a precipitation-hardening steel, the properties of the weld zone will differ from those of the base metal. For optimal performance, it is recommended to solution-anneal the entire component after welding (restoring it to the "A" condition) before proceeding with full heat treatment.
Q: What is the typical surface finish for AMS 5528 coil?
A: The most common surface finish is 2B (cold-rolled, annealed, and pickled). Bright Annealed (BA) products are also available for aerospace and high-precision applications; this process yields a smoother, more lustrous surface, thereby reducing friction and enhancing aesthetic quality.
