Stainless steel is a type of metallic substrate that is commonly used in a variety of applications, including as a substrate material. Stainless steel is an alloy that contains at least 10.5% chromium and is known for its high resistance to corrosion, staining, and rusting. This makes it a popular choice for applications where exposure to harsh environments is expected. Additionally, stainless steel is strong and durable, making it ideal for use as a substrate material in a variety of applications, including in electronics, construction, and many others. The exact composition of a stainless steel substrate can vary depending on the desired properties, but typically includes iron, chromium, nickel, and other elements.