In addition to chromium and nickel, 304-grade stainless steel is also comprised of up to 0.8% carbon and at least 50% iron. According to the World Steel Association, there are over 3,500 different grades of steel, encompassing unique physical, chemical, and environmental properties. Stainless steel: 276 is a group of iron-based alloys that contain a minimum of approximately 11% chromium,: 3 a composition that prevents the iron from rusting, as well as providing heat-resistant properties. 18/10 stainless often corresponds to this grade. With a high hardness level and consistent dimensional stability, A2 stainless steel shows good resistance to wear & tear. 18/18 and 18/10 are also known as Grade 304 stainless steel, and form part of the 300 series. Where is it likely to be found? To help cut through the confusion, our handy colour chart gives you quick and easy way to identify grades by colour or … Rolex is an exception in that they use Type 904L. Some people just use the colours while others will use the various codes associated with each product. Stainless steels in the 300 series are classified at austenitic, and can only be hardened by cold working methods. Also known as "marine grade" stainless steel due to its increased resistance to chloride corrosion compared to type 304. Flatware Grades: Another system to organize stainless steel grades in the foodservice industry is the flatware grading system. A2 grade stainless steel is also often referred to as type 304 or 18/8 - this latter label denotes the fact that A2 grade stainless steel containing approximately 8% nickel and 18% chromium. Stainless steels are mainly used when corrosion or oxidation is an issue, as the function that they perform can’t be duplicated by other materials for their cost. Posted by Arthur Harris & filed under Company News. Most watches that are made of stainless steel are made of this grade. Both of these grades will offer excellent corrosion resistance, cleanability, and the ability to handle extremely low (cryogenic) and high temperatures. This system uses ratios such as 18/0, 18/8, and 18/10 to describe the levels of nickel and chromium in food grade stainless steel. Stainless Steel Grades and Classification. Stainless Steel Grades: Explained. Engineering steel grades can be confusing! In essence, steel is composed of iron and carbon, although it is the amount of carbon, as well as the level of impurities and additional alloying elements that determine the properties of each steel grade. SS316 is often used for building nuclear reprocessing plants. The two most commonly produced grades of stainless steel are 304 (known as 'A2') and 316 (known as A4).