The 300 series stainless steel, including grades such as 304, 316, and 321, contains a minimum of 18% chromium and 8% nickel. It is highly corrosion-resistant and ideal for use in harsh environments, like chemical processing plants and marine applications. It is also popular in construction, consumer goods, and automotive industries due to its strength and shiny finish. Overall, 300 series stainless steel is a versatile material that offers a wide range of benefits and is widely used across various industries.