Stainless Steel 416 CNC Machining Service
Stainless steel 416 distinguishes itself with high hardness and strength, good corrosion resistance, and excellent machinability from additions of sulfur and phosphorus.
Chemical Composition of Stainless Steel 416
The key additions in 416 stainless steel are sulfur and phosphorus, which give it excellent machinability compared to other stainless grades, while maintaining decent corrosion resistance from the 12-14% chromium content. Manganese and molybdenum also optimize its hardness and machinability. The low carbon content prevents carbide precipitation.
| Element | Percentage (%) | Description |
|---|---|---|
| Carbon (C) | 0.15 Max | Increases strength and hardness. Higher carbon content can reduce weldability and formability. |
| Manganese (Mn) | 1.25 Max | Improves strength and hardness; acts as a deoxidizer. |
| Silicon (Si) | 1.00 Max | Used as a deoxidizer; improves strength. |
| Phosphorous (P) | 0.06 Max | Improves machinability and hardness. |
| Sulfur (S) | 0.15 Min – 0.35 Max | Greatly improves machinability. |
| Chromium (Cr) | 12.00-14.00 | Provides corrosion and oxidation resistance. |
| Molybdenum (Mo) | 0.60 Max | Increases strength and improves corrosion resistance. |
| Iron (Fe) | Balance | Forms the base and bulk of the alloy. |
Note: Stainless steel 416 composition and properties vary slightly by producer; contact us for specifics.
General Characteristics of Stainless Steel 416
416 stainless steel achieves high strength and hardness along with decent corrosion resistance. It has excellent machinability. But it has lower elongation and poorer weldability compared to austenitic stainless steels. It retains strength well even at moderately high temperatures.
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Physical properties
| Density | 7.8 g/cm³ |
| Corrosion resistance | Moderate; less than austenitic grades |
| Melting Point | 1450 - 1510 °C |
| Magnetism | Magnetic |
| Coefficient of Thermal Expansion | 10.3 µm/m/°C (at 20-100°C) |
| Thermal Conductivity | 24.9 W/mK (at 100°C) |
| Electrical properties | 0.57 µohm-m (at 20°C) |
Mechanical properties
| Ultimate Tensile Strength (UTS) | 517 MPa |
| Yield Strength (0.2% Offset) | 276 MPa |
| Elongation at break | 30% |
| Modulus of Elasticity (Elastic Modulus) | 200 GPa |
| Fatigue Strength | 275 MPa (Estimated) |
| Brinell Hardness | 262 HB |
| Vickers hardness | 270 HV |
Available Surface Finishing
| Passivation | Removes free iron, enhances corrosion resistance with thin oxide film formation. |
| Polishing | Achieves various finishes, enhances aesthetic appeal, sometimes improves corrosion resistance. |
| Bead Blasting | Propels abrasive material for uniform matte texture, roughening, or contaminant removal. |
| Black Oxide Coating | Offers mild corrosion resistance, minimizes reflection, conversion coating for ferrous materials. |
Note: The properties of SS416 can exhibit minor variations depending on the supplier.
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 416
Stainless Steel 416, due to its excellent machinability and good mechanical properties, is widely used in CNC machining for a variety of applications. Here are some of its common applications:
Automotive Components
Stainless Steel 416 is widely used in the automotive industry for parts requiring excellent machinability and good strength. It's ideal for gears, valves, shafts, and components in fuel systems, offering high durability and corrosion resistance.
Industrial Machinery
Due to its strength and corrosion resistance, Stainless Steel 416 is a popular choice for manufacturing various industrial machinery parts. It's used in gears, bolts, nuts, and pump shafts, ensuring reliability in demanding industrial environments.
Electrical Equipment
This steel is often employed in electrical applications for its magnetic properties. Components like electrical motors, sensors, and actuators benefit from its strength, machinability, and magnetic permeability, making it a versatile choice in this sector.
FAQS About Stainless Steel 416
While Stainless Steel 416 offers moderate corrosion resistance, it is not as resistant as austenitic stainless steels like 304 or 316. It’s best suited for environments where mild corrosion is expected but should be avoided in highly corrosive settings.
Stainless Steel 416 is highly preferred for CNC machining due to its excellent machinability. This means it can be easily cut and shaped, allowing for precise and efficient machining processes. The alloy’s composition, especially its sulfur content, contributes to this ease of machining.
Yes, Stainless Steel 416 is well-suited for achieving tight tolerances in CNC machining. Its consistent and predictable machining behavior allows for the creation of parts with high precision, making it ideal for complex and detailed components.
Welding Stainless Steel 416 is more challenging than welding austenitic stainless steels due to its high sulfur content. Preheating and post-welding treatments are recommended to mitigate cracking risks. Using appropriate welding methods and fillers can yield successful results.
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