Why Stainless Steel Grades Matter in Commercial Food Equipment

Commercial food equipment is expected to withstand a lot. While they are designed for constant use, regular cleaning, moisture, food acids, and strict hygiene requirements can all be damaging to the equipment. However, the material used to manufacture this equipment will have a significant role in how well it performs long-term.

You have probably noticed that the majority of commercial kitchen equipment is constructed from stainless steel. It has become the industry standard because it combines strength, corrosion resistance, and is very easy to clean.

However, not all stainless steel is the same. There are different grades which offer completely different levels of strength and protection, making some better suited to certain applications than others. Understanding the differences before you invest will help prevent you from paying for unnecessary features.

Why Is Stainless Steel Used in Food Equipment?

Commercial food equipment is usually subjected to continual and demanding use. Few materials are capable of withstanding these conditions. Not only is stainless steel a very strong and durable material, but its hygienic properties also ensure that cleaning and maintenance are simple. It is also corrosion-resistant, ensuring all parts maintain a long service life.

Alternative materials such as mild steel, aluminium and plastic can all be suitable in certain situations. Still, few are capable of matching stainless steel's combination of hygiene, durability and corrosion resistance. This is why stainless steel has become the industry standard for commercial food equipment.

Unlike many other materials, stainless steel can withstand years of daily use without losing its structural integrity. When properly maintained, it remains suitable for direct food contact throughout its lifespan.

Why Stainless Steel Is Better Than Many Other Materials

Mild Steel

Mild steel is usually much cheaper than stainless steel, around two to four times less expensive. However, this material requires protective coatings and can rust very easily if this coating is damaged.

Once the protective coating has been damaged, moisture can reach the steel beneath, allowing rust to develop. Rust not only weakens the material over time but also creates rough surfaces that are more difficult to clean effectively.

In most cases, this material is unsafe for food machinery and unsuitable for direct contact with food. Instead of being used for food-contact areas of the machine, it can be used for structural frames on the inside.

Painted Steel

Similarly, painted steel can easily become scratched, exposing bare metal material. Once the paint has been scratched or chipped, moisture can reach the steel underneath. This often leads to corrosion, which can spread beneath the paint if left untreated.

Aluminium

Aluminium can be a great material option for certain parts due to its lightweight nature, making it easy to operate. It also naturally resists corrosion and performs well in many food preparation environments.

However, repeated exposure to highly alkaline or acidic cleaning chemicals can gradually damage the surface if unsuitable products are used. Aluminium is also a much softer material than stainless steel. This means that it will scratch more easily and can dent under heavy use. Although it is corrosion-resistant, certain strong chemicals will have a greater effect on it compared to stainless steel.

Plastic

Plastic is an extremely lightweight and inexpensive material. It is usually used for handles, knobs, guards, chopping boards, containers, and other non-structural components where its lightweight nature is beneficial. It is usually a great option for accessories, not working parts or primary machinery.

However, it has a much shorter lifespan and less heat resistance. Once plastic becomes heavily scratched, the grooves can become more difficult to clean thoroughly, making regular inspection and replacement important.

Photo by Marek Studzinski on Unsplash

What Makes Stainless Steel Hygienic?

Hygiene is one of the most important aspects to consider when choosing a material for food machinery. Unlike porous materials, stainless steel does not absorb liquids, odours, or bacteria into its surface. Food residues remain on the surface, allowing them to be removed effectively through routine cleaning and disinfection.

While the material itself promotes easy cleaning, a hygienic design is just as important as the material itself. Poor welding, lots of crevices, and hard-to-reach areas can still harbour bacteria. These will make it very difficult to properly sanitise your workspace.

What Are Stainless Steel Grades?

A stainless steel grade describes the material's chemical composition and mechanical properties. Different grades contain different amounts of elements (such as chromium and nickel), which influence the strength, corrosion resistance, and cost of the material.

The most common grades used in food equipment are 304 and 316.

304 Stainless Steel

This steel is often referred to as food-grade steel and is suitable for almost all commercial food environments. It is made up of 18% chromium and 8% nickel, which creates a highly durable and strong material that is resistant to corrosion.

304 steel can be affected by high salt concentrations and specific cleaning chemicals. However, this usually occurs if the material has not been properly cared for previously.

This material is usually used on work tables, prep surfaces, cabinets, and machinery such as slicers and mincers. It is widely available, affordable, and has a long lifespan, making it suitable for a variety of purposes in a commercial kitchen.

One reason 304 is so popular is how inexpensive it is for its performance. For the majority of commercial kitchens and food processors, it provides all the corrosion resistance required without the additional expense of specialist grades.

316 Stainless Steel

This steel also contains chromium and nickel, with the addition of molybdenum. This element greatly improves its corrosion resistance, making this material better suited for very harsh environments that would eventually wear down 304 steel.

316 steel is perfect for environments with high salt concentrations such as coastal businesses, seafood or high-salt food processors, or workspaces that require chemical wash-downs.

Although this steel features much higher durability, this comes with a cost. Luckily, the advantages of this steel are often unnecessary for standard kitchens and are only required in the industries outlined.

430 Stainless Steel

As 430 contains little or no nickel, it is less expensive than 304 stainless steel. However, this cost reduction comes at the expense of corrosion resistance. Therefore, 430 steel is usually used for decorative parts, appliance exteriors, and splashbacks. Due to the low corrosion resistance, it is usually not preferred for food-contact areas.

Duplex Stainless Steel

On the other hand, Duplex steel is extremely strong, corrosion-resistant, and expensive. It is only used in specialist industrial processing and is an unnecessary expense for standard commercial kitchens.

How to Choose the Right Grade

Choose 304 if:

• General food preparation or processing.

• Most commercial kitchens.

• Butchers.

• Delis.

• Bakeries.

Choose 316 if your business is:

• Seafood processing.

• High salt environments.

• Frequent chemical cleaning.

• Coastal locations.

• Highly corrosive environments.

How to Care for Stainless Steel Equipment

To get the most out of your stainless steel equipment, you must follow a daily cleaning schedule that removes all debris. Wash with warm water and a suitable food-safe detergent.

Using steel wool, chlorine bleach, or other highly abrasive cleaners will damage the protective surface of the steel and should only be used if absolutely necessary. Instead, opt for a microfibre cloth, soft brush, or non-scratch pads, which will maintain your steel and thoroughly clean it.

Ensure that you are regularly inspecting your machinery and work surfaces for:

• Surface staining.

• Scratches.

• Early signs of corrosion.

• Loose welds.

• Pitting.

• Discolouration.

This will allow you to catch any damage early. Also ensure that you are properly maintaining your equipment as a whole, not just from the outside.

Invest For Your Business

Stainless steel is the industry standard because it offers the combination of hygiene, durability, and corrosion resistance that many businesses require. While 304 stainless steel meets the needs of most food businesses, 316 stainless steel provides additional protection for more demanding environments.

Understanding the differences between stainless steel grades allows businesses to invest in equipment that suits their specific requirements. Do not pay for features that may never be needed or choose materials that are unlikely to withstand their operating conditions. Combined with proper cleaning, regular maintenance, and sensible use, high-quality stainless steel equipment can provide reliable performance for many years.