There are several different types and grades of steel, each with their own unique chemical composition and mechanical properties. One such grade is A203/A203M-17 steel. This grade of steel is commonly used in the fabrication of pressure vessels and boilers. It has a specified minimum yield strength of 55,000 psi (380 MPa) and a specified minimum tensile strength of 70,000 – 90,000 psi (485 – 620 MPa). The chemical composition of A203/A203M-17 steel typically includes elements such as carbon, manganese, phosphorus, sulfur, silicon, nickel, chromium, and molybdenum. These elements help to enhance the strength, toughness, and corrosion resistance of the steel. A203/A203M-17 steel is versatile and can be used in a variety of applications that require high strength and durability. It is important to note that the specific chemical composition and mechanical properties of A203/A203M-17 steel may vary depending on the manufacturing process and any additional heat treatments that are applied. It is always recommended to consult the corresponding standard number, A203/A203M-17, for specific information and guidelines regarding the use and properties of this steel grade.