There are too many kinds of steel. Generally speaking, the harder the material characteristics, the softer the grinding wheel. The material of steel determines the grinding requirements of grinding wheel. For example, it is best to use a green carbon grinding wheel for stainless steel, and generally use white corundum. The hardness of grinding wheel is generally at L, K and J levels. The larger the working surface of the product, the softer the grinding wheel will be. You can contact the manufacturer for details. They can recommend the products you need according to your products.