Stainless steel is an incredible material. It’s corrosion-resistant, strong, low-cost, and easily available. Stainless steel sheets come in a wide range of thicknesses and widths. There are numerous grades for different applications.
So, a lot of optimization options are available for material selection. Stainless steel sheet metal fabrication is adaptable and customizable. So, a great deal of design flexibility is there. Modern CNC processes, such as laser cutting and CNC bending, provide consistency in product specifications. Let’s learn more about it.
What Is Stainless Steel Sheet Metal Fabrication
Stainless steel sheet metal fabrication is the process of creating functional or decorative parts from stainless steel sheets. This stainless-steel sheet metal fabrication process involves manufacturing operations such as bending, welding, forming, stamping, and deep drawing.
In addition to traditional processes, CNC processes are being used to boost quality, consistency, and repeatability. CNC laser cutting, CNC bending, and CNC forming are good additions to stainless steel sheet metal fabrication processes.
Additional processing might include PVD coating. PVD coating modifies the surface to improve aesthetics, wear resistance, and frictional behavior. Suitable stainless sheet metal fabrication yields numerous finished products. Brackets, enclosures, panels, and cabinets are a few examples of stainless steel sheet metal fabrication.
Depending on the application, appropriate stainless-steel sheet specifications are selected. Consideration is made of the suitability of sheet thickness, width, and grade. Each grade has its own suitability for a specific application.
Grades of Stainless Steel
Stainless steel is an incredible material. It contains chromium as a primary alloying element. The chromium atoms create a self-healing chromium oxide layer. This layer gives it a lustrous look. It protects it against chemical attack. Besides chromium, nickel and molybdenum are the other two important alloying elements.
The variation in chemical composition is classified in standardized grades. Grade selection is based on the application. As an example, 304-grade stainless steel is used in food-grade applications. 316 is mainly used in marine applications and so on. The table below mentions some of the commonly used grades for stainless steel sheet metal fabrication:
Grade | Standard | Phase | Characteristics | Applications |
304 | ASTM A240 | Austenitic | Excellent corrosion resistance and good formability | Food equipment, kitchen appliances |
316 | ASTM A240 | austenitic | Marine corrosion resistance | Marine or medical devices |
301 | ASTM a240 | Austenitic | High strength after cold working | Aerospace parts |
430 | ASTM A240 | Ferritic | Cost- effective | Appliances and decorative panels |
409 | ASTM A24O | Ferritic | Good heat and oxidation resistance | Automotive exhaust systems |
2205 | ASTM A240 | Duplex | Very high strength and corrosion resistance | Oil and gas equipment |
Common Stainless Sheet Fabrication Processes
A few stainless steel sheet metal fabrication processes are commonly employed to create functional products. Stainless steel sheets can be subjected to shaping, cutting, or joining. Specialized equipment is needed to attain the desired geometry and structural performance. The table below mentions some of the common stainless sheet fabrication processes:
Process | Manufacturing principle | Benefits | Applications |
Laser Cutting | Cuts stainless sheets using a focused laser beam | High precision and smooth edges | Panels, machine parts and enclosures |
Punching | Creates holes by pressing a punch through the sheet | efficient for repetitive features | Perforated sheets and ventilation panels |
Bending | forms sheets into angles using Press Brakes | Accurate shaping | Frames, housings and channels |
Welding | Joins multiple sheet parts using an electric arc | permanent joints for assemblies | Cabinets, tanks, equipment frames |
Laser cutting
Laser cutting is a fairly common stainless steel sheet metal fabrication process. It’s gaining traction because of its high precision. Laser cutting is ideal for producing clean cuts. A high-energy laser beam is focused on the sheet metal. This laser beam penetrates the metal. It then melts or vaporizes it.
The laser’s positioning is highly accurate due to CNC control. The laser follows a programmed path as per the CAD and CAM files. It then carves out complex geometries, fine details, and intricate patterns. This stainless steel sheet metal fabrication technique is widely used to manufacture machine panels, enclosures, brackets, and architectural components.
In contrast to other methods, laser cutting can use relatively thinner sheets as feedstock. As the heat-affected zone is narrow, a low distortion is produced.
Punching
Punching is a comparatively cheaper stainless steel sheet metal fabrication technique to produce holes and slots. It offers high repeatability and good manufacturing speed. Dozens of holes can be made in a minute by the repetitive motion of the hardened punch tool. Punching is commonly used in the manufacturing of perforated sheets and ventilation panels.
Bending
Press brakes are commonly used to bend stainless steel sheets at the desired angles. A good combination of controlled force and accurate adjustment of bending parameters is necessary. Skilled operators trail test bending to compensate for the springback effect. This stainless steel sheet metal fabrication process is used to manufacture brackets, frames, housings, and machine enclosures.
Welding
Welding permanently joins metal components. Commonly used welding techniques include TIG welding, MIG welding, spot welding, and laser welding. By far, TIG welding is the most popular one. It gives a really clean finish with minimal spatter.
To further improve the surface finish, additional processes like grinding, polishing, or passivation can be employed. While welding is used in numerous stainless steel sheet metal fabrication tasks, the most common applications include tanks, frames, cabinets, and industrial equipment.
Advantages of Stainless Sheet Metal Fabrication
Stainless steel sheet metal fabrication offers ample advantages. Stainless steel sheets can be easily cut, formed, and joined. Its relatively lower cost and excellent corrosion resistance make it promising for many applications. A high level of design flexibility increases its attractiveness. In certain applications, stainless steel cannot be appropriately substituted with any other material. Let’s learn about the advantages in detail:
Excellent corrosion resistance
Stainless steel sheets offer an impressive corrosion resistance while preserving the benefits of ferrous metals. A good combination of high corrosion resistance, low cost, and high mechanical strength makes it highly attractive for stainless steel sheet metal fabrication.
Some low-cost grades like 200 series alloys can withstand moderate atmospheric corrosion. Other high-cost grades like 316 and 316L are suitable for marine applications. 304 stainless comes in between. These selection options make stainless steel sheets useful in a broad spectrum of applications.
High design flexibility
Stainless steel sheet metal fabrication can be adapted to a list of processes. Depending on the design complexity, a suitable process can be chosen. As an example, for custom applications, stainless steel can adapt to CNC processes like laser cutting, CNC bending, etc.
For mass production, it can adapt to processes like stamping, etc. As stainless steel sheets come in almost any thickness, the thickness optimization is possible. Even a 0.05mm reduction in thickness can impact cost greatly.
Suitability for food-grade applications
304-grade stainless steel is widely used in food-grade applications. Common examples include storage tanks for milk, cooking utensils, silos, piping for beverages, etc. Moreover, its high availability and easy stainless steel sheet metal fabrication increase its relevance.
Suitability for medical applications
316 and 316L grades are deemed suitable for medical applications. Its smooth surface resists the accumulation of bacteria, dirt, and moisture. Due to its robustness against chemical attack, it can endure several sterilization cycles.
Scalability
Most of the stainless steel sheet metal fabrication processes offer high scalability. As the design gets approved, prototypes can be manufactured with ease. If things go fine with the prototypes, mass production can begin whenever it is needed. Most techniques can be implemented for a low MOQ.
Variety of surface finishes
Stainless steel sheets come in a variety of surface finishes. Consumers have the option to select from brushed, satin, or mirror-polished finished sheets. In many applications, the bare surface of stainless steel is acceptable. Thus, it doesn’t incur additional surface treatment costs. If required, a stainless steel surface is suitable for painting and PVD coating.
Custom Stainless Sheet Metal Fabrication Services
Quite often, custom stainless sheet metal fabrication services. Although standardized components are still being manufactured in bulk quantities. But, custom services are required to meet unique functional, dimensional, and performance requirements.
Clients usually send CAD model files. These files are then checked, and suggestions are given. Prototypes are manufactured by custom fabrication options only. It enables testing and refining designs before mass production. In this scenario, industries like food processing, medical equipment, electronics, construction, and industrial machinery often look for custom options.
Custom stainless sheet metal fabrication enables manufacturers to incorporate custom dimensions and specialized features. Compliance with the relevant quality standards can be ensured. Manufactured components can be subjected to finishing and post-processing options as per the client’s request. The modern trend is to use CNC machines to ensure repeatability and consistency.
Conclusion
Stainless steel sheet metal fabrication is being adopted across industries. On one hand, stainless steel offers unique properties like corrosion resistance, high strength, low cost, etc. On the other hand, fabrication options are quite flexible. They offer a high level of customization.
For manufacturers, stainless steel sheet metal fabrication offers significant flexibility. For consumers, it provides a good level of customization with the possibility of scaling up production. Contact Jianglin Steel today for a custom stainless steel fabrication quote.
