Stainless Steel 17-4 PH
Exceptional strength and hardness, good corrosion resistance, excellent machinability and weldability, high-temperature stability up to 600°F.
Chemical Composition of Stainless Steel 17-4 PH
Stainless Steel 17-4 PH, also known as UNS S17400 or AISI 630, is a martensitic precipitation-hardening stainless steel known for its strength and corrosion resistance. Here is a detailed breakdown of its chemical composition:
| Element | Percentage Composition | Description |
|---|---|---|
| Carbon (C) | 0.07% Max | Increases strength and hardness; high levels can reduce corrosion resistance. |
| Manganese (Mn) | 1.00% Max | Contributes to strength and toughness; aids in hot working processes. |
| Phosphorus (P) | 0.04% Max | Boosts strength and hardness; excessive amounts can lower ductility. |
| Sulfur (S) | 0.03% Max | Generally kept low to maintain corrosion resistance and toughness. |
| Silicon (Si) | 1.00% Max | Strengthens steel; too much lowers melting point and reduces corrosion resistance. |
| Chromium (Cr) | 15.0 - 17.5% | Enhances corrosion resistance, hardness, and strength. |
| Nickel (Ni) | 3.0 - 5.0% | Increases toughness and corrosion resistance; stabilizes steel at various temperatures. |
| Copper (Cu) | 3.0 - 5.0% | Adds to corrosion resistance and strength, especially in marine environments. |
| Niobium + Tantalum (Nb + Ta) | 0.15 - 0.45% | Aids in carbide formation, improving strength and toughness. |
| Iron (Fe) | Balance | Base metal providing the fundamental matrix and properties of the alloy. |
Note: Stainless steel 17-4 PH composition and properties vary slightly by producer; contact us for specifics.
General Characteristics of Stainless Steel 17-4 PH
The key highlights are its excellent strength, hardness, machinability and corrosion resistance compared to other stainless steel varieties, along with good high temperature stability.
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Physical properties
| Density | 7.8 g/cm³ |
| Corrosion resistance | Excellent |
| Melting Point | Roughly 1400-1440°C |
| Magnetism | Slightly magnetic |
| Coefficient of Thermal Expansion | Around 10.8 µm/m/°C at 20-100°C |
| Thermal Conductivity | Approximately 17.9 W/mK at 100°C |
| Electrical properties | About 800 µΩ·m at 20°C |
Mechanical properties
| Ultimate Tensile Strength (UTS) | Typically 1030 MPa |
| Yield Strength (0.2% Offset) | Usually about 1000 MPa |
| Elongation at break | Around 12% |
| Modulus of Elasticity (Elastic Modulus) | About 200 GPa |
| Fatigue Strength | Approximately 550 MPa |
| Brinell Hardness | Typically 363 HB |
| Vickers hardness | Roughly 390 HV |
Available Surface Finishing
| Passivation | Enhances corrosion resistance by removing surface contamination, typically iron particles. |
| Polishing | Produces a smooth, reflective surface, improving appearance and cleanliness. |
| Bead Blasting | Creates a uniform matte finish, reducing visual surface imperfections. |
| Black Oxide | Offers mild corrosion resistance and reduces light reflection from the surface. |
| Powder Coating | Provides a durable, corrosion-resistant layer with various color options. |
Note: The precise values can vary slightly depending on the specific 17-4 PH grade and processing. Please let me know if you need any clarification or additional details!
Types of CNC Machining Stainless Steel Process
The variety of aluminum machining services at AT-Machining can produce a wide range of products in different shapes and sizes.
These include CNC Milling, CNC Turning, Swiss Machining, EDM, and Grinding. Utilizing a combination of these processes is often necessary to meet the expectations for quality and accuracy set by AT-Machining and our customers.
Our team of experienced engineers can tailor the production process depending on the needs of each project, creating efficient solutions with a commitment to exceptional quality in each finishing process.
Common Applications of Stainless Steel 17-4 PH
Aluminum 7075-T6, known for its strength and durability, is widely used in Aerospace, Automotive, and Defense, from aircraft structures to automotive wheels and armor plates.
Aerospace Components
Utilized for gears, shafts, fasteners, structural parts; prized for high strength-to-weight ratio and exceptional corrosion resistance in extreme conditions.
Medical Devices
Ideal for surgical instruments, orthopedic implants, dental equipment; offers biocompatibility, sterilization compatibility, strength, and precision in critical healthcare applications.
Industrial Equipment
Used in valves, pumps, pistons; provides high strength, heat and corrosion resistance in harsh industrial environments, ensuring durability and reliability.
FAQS About Stainless Steel 17-4 PH
It differs in its chemical composition, specifically with higher chromium, nickel, and copper content, leading to superior strength and corrosion resistance.
Heat treatment can significantly alter its mechanical properties, including increasing its strength and hardness.
The primary challenges include its high strength, which can wear out tools quickly, and the need for precise machining parameters.
CNC machining offers high precision, consistency, and the ability to produce complex shapes with 17-4 PH stainless steel.
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