What is the designation for molybdenum-chromium-nickel steel?

The designation for molybdenum-chromium-nickel steel falls under the SAE steel classification system. In this system, the primary alloying elements, such as nickel, chromium, and molybdenum, are represented by specific identifiers. Molybdenum-chromium-nickel steels typically have the initials "43" in their classification, which indicates the presence of chromium (the "4" in this case) along with nickel and molybdenum.

For instance, the 43 in the designation signifies that chromium is the primary alloying element, while the presence of nickel and molybdenum is denoted in subsequent numeric positions. This specific classification helps engineers and designers choose the right steel grade based on the required properties like strength, toughness, and corrosion resistance.

The other designations listed refer to different compositions and properties, such as different primary alloying elements. Understanding how these designations correlate with the alloying elements is crucial for selecting materials that meet the desired mechanical requirements in engineering applications.