What grade stainless steel won't rust?

Stainless steel is known for its corrosion resistance, which is due to its chromium content. The most common grades of stainless steel that exhibit excellent corrosion resistance and are less likely to rust are those in the 300 series, specifically the austenitic grades. The most notable grade for rust resistance is 304 stainless steel, often referred to as 18-8 stainless steel, which contains 18% chromium and 8% nickel. This grade is commonly used for various applications including kitchen appliances, sinks, and outdoor structures.

Additionally, 316 stainless steel is another highly corrosion-resistant grade, commonly known as marine-grade stainless steel. It contains 16-18% chromium, 10-14% nickel, and 2-3% molybdenum, which enhances its resistance to corrosion in harsh environments, such as marine or chloride-rich environments.

Both 304 and 316 stainless steel grades are widely used in various industries where corrosion resistance is crucial, and they are known for their ability to resist rusting and staining. However, it's important to note that while these grades are highly resistant to rust, they are not completely immune to corrosion under all conditions. Proper maintenance and care are still important to ensure their longevity and performance.