If you are in the processing business, corrosion can be a major issue. For example, you might require both aluminum and stainless steel tube fittings and other components. But in some cases, you may need to choose between aluminum and stainless steel and sometimes it can be a difficult decision. Let’s explore the differences and similarities between the two metals, to help make your decision a little easier.
Strength
When it comes to brute strength, stainless steel tube fittings win hands down. Made from steel, chromium and other alloys, it is nearly as strong as standard carbon steel.
Weight
Aluminum is one of the lightest metals. In fact, you can use about three times as much aluminum to equal the same amount of weight in stainless steel. If weight is a factor, aluminum easily wins out.
Cost
You’ll find it is considerably cheaper to purchase aluminum. This is an important consideration if all other comparisons are close to the same.
Corrosion
Since both metals are resistant to corrosion it can sometimes be hard to choose between the two. For resistance to saltwater, aluminum may be the best choice. However, in toxic environments aluminum can corrode fast, depending on the aluminum alloy. Even when aluminum has been anodized it can still corrode under certain conditions.
Sanitation
Aluminum is not the best for food and beverages. In fact, it can react with acidic materials and cause contamination issues. However, this is not the case with stainless steel. It is non-porous and can be sterilized. In fact, it resists many kinds of bacteria and contaminants. This is why you see products like stainless steel tube fittings, pipes and tanks, in many types of food processing businesses today.
Workability
Since aluminum is softer, it is easier to work with. However, steel is much easier to weld and machine.