17-4 PH annealed stainless steel sheet
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17-4 PH stainless steel plate is a martensitic precipitation-hardening stainless steel, also known as SUS630 or UNS S17400. Annealed 17-4 PH stainless steel plate refers to a 17-4 PH stainless steel plate that has undergone solution annealing heat treatment, serving as a pre-treated blank before final age hardening. It is also referred to as 17-4PH Condition A.
Solution annealing is typically conducted at 1020–1060°C followed by rapid cooling, which controls the hardness below 38 HRC (≤363 HB). This provides excellent machinability, making it easy to cut and form. Its corrosion resistance is close to that of 304 stainless steel, allowing it to adapt to conventional processing and storage environments.
After subsequent low-temperature age hardening treatment (with aging temperatures adjustable between 480°C and 620°C), its tensile strength can reach 930–1310 MPa to meet diverse application requirements, while maintaining minimal deformation post-heat treatment.
Due to its ease of secondary processing, annealed 17-4 PH steel plates are mainly used for custom machining of various structural components, such as aerospace engine brackets, chemical valve cores, medical surgical instruments, petroleum industry valve stems, and other parts requiring high strength and corrosion resistance.
Standards for 17-4 PH Annealed Sheet
ASTM A693: Standard specification for rain-hardening stainless steel heat-resistant sheets, plates, and strips (most commonly used).
AMS 5604: Aerospace materials standard (for sheet metal).
Chemical Composition of 17-7PH (Type 631 / UNS S17700)
| Element | Iron (Fe) | Chromium (Cr) | Nickel (Ni) | Aluminum (Al) | Silicon (Si) | Manganese (Mn) | Carbon (C) | Sulfur (S) | Phosphorus (P) |
| Content (%) | 70.0 – 75.0 | 16.0 – 18.0 | 6.50 – 7.75 | 0.75 – 1.50 | ≤ 1.0 | ≤ 1.0 | ≤ 0.090 | ≤ 0.040 | ≤ 0.040 |
17-7PH Mechanical Properties
| Condition | Process Description | Tensile Strength (Rm) MPa | Yield Strength (Rp 0.2%) MPa | Elongation (% in 50mm) | Hardness (Rockwell) |
| Condition A | Solution Annealed (Ready for forming) | ≤ 1035 | ≤ 380 | ≥ 20% | ≤ 92 HRB |
| TH1050 | Hardened at 1050°F (565°C) | ≥ 1170 | ≥ 1035 | ≥ 5% | ≥ 38 HRC |
| RH950 | Cold Treated + Hardened at 950°F (510°C) | ≥ 1310 | ≥ 1200 | ≥ 4% | ≥ 44 HRC |
| Condition C | Cold Rolled (Hard) | ≥ 1380 | ≥ 1210 | ≥ 2% | ≥ 41 HRC |
17-7PH Condition A sheets Physical Properties
| Density (Condition A) | Melting Range | Modulus of Elasticity | Thermal Conductivity (100°C) | CTE (20-100°C) | Magnetic Property |
| 7.80 g/cm³ | 1415 – 1450 °C | 197 GPa | 16.4 W/m·K | 10.8 x 10⁻⁶ /°C | Magnetic in hardened state |
How to increase the strength of 17-4 PH annealed plates to the maximum level?
Through a single-step aging treatment.
The most commonly used conditions include:
H900: Heat at 900°F (482°C) for 1 hour; hardness reaches 40-47 HRC (maximum strength).
H1050: Heat at 1050°F (565°C) for 4 hours; hardness is approximately 35-41 HRC (better toughness).
Will the dimensions of 17-4 PH change after heat treatment?
Yes, but minimally. 17-4 PH undergoes a slight shrinkage when transforming from Condition A to an aged state (such as H900). The dimensional change is approximately 0.0004 to 0.0006 inches per inch (or 0.04% - 0.06%).
How is the corrosion resistance of 17-4 PH in the annealed state?
In Condition A, its corrosion resistance is generally inferior to that of the fully aged states. Its corrosion resistance is comparable to 304 stainless steel. It outperforms all 400-series martensitic stainless steels (such as 410 and 420) but is lower than 316 stainless steel.
Applications of 17-7PH Stainless Steel Sheets
Aerospace: Structural components, springs, and clamps, etc.
Automotive: Diaphragm springs, pressure sensors, and high-performance washers.
Chemicals: Valve components, bellows, and pump shafts.
Precision Instruments: High-stress components in surgical instruments and electronic fasteners.
17-7PH Stainless Steel Sheets price per kg
The price for 17-7PH (UNS S17700) stainless steel sheets and plates generally ranges from $8 to $12 per kg for raw material. However, depending on thickness, surface finish, and heat-treatment condition (e.g., Condition A, H900, H1050), finished sheets can cost $10 to $18 per kg.
Click to get 17-4PH FOB price
17-4 PH Stainless Steel Sheet Supplier
GNEE not only supplies raw materials but also provides shearing, slitting, laser cutting, and bending services. Through deep cooperation with TISCO, Baosteel, and internationally renowned steel mills, we guarantee that every plate originates from genuine, certified materials.
In-Stock Supply: GNEE maintains a regular stock of standard 17-4 PH plates, with packaging and shipping typically completed within 3 to 7 working days.
Custom Production: For special dimensions or specific compliance standards (such as aerospace-grade AMS standards), the delivery lead time is usually 15 to 30 working days.
Logistics Tracking: We provide full-process logistics updates to ensure on-time delivery to the port or your warehouse.
17-4 PH annealed stainless steel sheet Specifications
| Material Grade | UNS / EN No. | Applicable Standards | Common Delivery Conditions | Surface Finish |
| 17-7PH (631) | S17700 / 1.4568 | ASTM A693, AMS 5528, MIL-S-25043 | Condition A (Solution Annealed) | No.1 (Hot Rolled), 2B (Cold Rolled) |
| Product Form | Thickness Range | Width Range | Length Range | Thickness Tolerance | Flatness Tolerance |
| Cold Rolled Plate/Sheet | 0.3 mm – 3.0 mm | 1000 – 1250 mm | 2000 – 4000 mm | Per ASTM A480 | ≤ 3 mm / m |
| Hot Rolled Plate | 3.0 mm – 50.0 mm | 1250 – 2500 mm | 2000 – 6000 mm | Per ASTM A480 | ≤ 5 mm / m |
Quality control
We guarantee that all products undergo rigorous testing before leaving the factory and come with an MTC (Material Certificate of Conformity): chemical composition analysis, hardness testing, dimensional inspection, ultrasonic flaw detection (optional), and support for on-site sampling inspections of mechanical properties or intergranular corrosion tests by third-party organizations such as SGS, BV, and TUV.
Here is the PMI testing of 17-4 PH stainless steel plates!
Packaging:
We use high-standard sea freight packaging to prevent the boards from getting damp or damaged during transportation:
Waterproof paper + plastic film: Blocks moisture.
Steel strapping + corner protectors: Reinforces the packaging structure and prevents edge damage.
Wooden pallets/crates: Uses reinforced pallets that meet international fumigation standards.
FAQ
What is the difference between 17-4 PH and 17-7 PH stainless steel?
17-4 PH stainless steel possesses extremely high hardness, rigidity, and good weldability. It is primarily used in structural components, aerospace parts, drive shafts, fasteners, and medical devices.
17-7 PH stainless steel exhibits even greater ductility in the annealed state, making it easy to bend into complex shapes. It is the preferred material for springs, bellows, diaphragms, and components subjected to repeated bending and stress.
Can 17-4 PH sheet in the annealed state be bent or cold-formed?
Recommendation: The bending radius should be as large as possible. If deep drawing or vigorous forming is required, 17-7 PH is generally recommended because it is softer (austenitic structure) in the annealed state and easier to form.
