Kegs used in brewing are typically made from stainless steel, specifically either 304 or 316 stainless steel. These materials are chosen for their excellent corrosion-resistance properties, which is crucial in maintaining the quality of the beer and ensuring the longevity of the kegs.
Stainless steel is a popular choice for brewing equipment because it is durable, easy to clean, and resistant to rust and corrosion. It is also non-reactive, meaning it does not interact with the beer and alter its flavor or quality. This is particularly important when dealing with acidic or hop-forward beers, as other metals may impart unwanted flavors or reactions.
304 stainless steel is the most common grade used in brewing applications. It is an austenitic stainless steel that contains 18-20% chromium and 8-10.5% nickel, which provides good corrosion resistance and durability. It is also relatively affordable and easily available, making it a popular choice for kegs.
316 stainless steel, on the other hand, is a higher-grade stainless steel that contains additional molybdenum, which enhances its corrosion resistance, especially in acidic environments. It is often used in more demanding brewing applications or for kegs that will be exposed to more aggressive cleaning agents or environments.
Personal experience: In my years of brewing, I have primarily used 304 stainless steel kegs. They have proven to be reliable, easy to clean, and resistant to corrosion. I have found them to be a great investment as they have held up well over time, even with regular use and cleaning.
It is worth noting that while stainless steel is the most common material for kegs, there are also aluminum kegs available in the market. Aluminum kegs are lightweight and can provide some advantages in terms of portability, especially for events or outdoor activities. However, they may not offer the same level of durability and corrosion resistance as stainless steel kegs. Aluminum can react with certain chemicals and acids, potentially affecting the flavor and quality of the beer.
Kegs used in brewing are primarily made from stainless steel, with 304 and 316 being the most common grades. These stainless steel kegs offer excellent corrosion resistance, durability, and ease of cleaning, making them ideal for maintaining the quality of the beer. While aluminum kegs are also available, they may not provide the same level of durability and corrosion resistance as stainless steel.