ASTM A890/A890M-13 is the standard specification for castings, iron-nickel-chromium and iron-nickel-chromium-molybdenum alloy, for corrosion-resistant service. This specification covers five grades of castings, which are categorized based on their chemical composition, mechanical properties, and heat treatment.
The key characteristics of A890/A890M-13 steel grade are as follows:
Chemical Composition:
– Iron (Fe): The base element of the steel grade.
– Nickel (Ni): Enhances the corrosion resistance and provides high temperature strength.
– Chromium (Cr): Improves the corrosion resistance and strength of the steel.
– Molybdenum (Mo): Increases the resistance to pitting and crevice corrosion, particularly in chloride-containing environments.
Mechanical Properties:
– Tensile Strength: A minimum requirement for the stress at which the steel starts to deform permanently.
– Yield Strength: The stress at which the steel begins to exhibit plastic deformation.
– Elongation: The percentage increase in length of the steel before breaking during tensile testing.
– Hardness: The ability of the steel to resist indentation or penetration.
– Impact Toughness: The ability of the steel to absorb energy in a sudden impact without fracturing.
Standard Number:
The standard number A890/A890M-13 refers to the specific version of the ASTM standard that outlines the requirements and test methods for this steel grade. It provides a framework for manufacturers and customers to ensure the quality and consistency of the steel castings.
Corresponding:
The term “corresponding” in this context refers to the relationship between the standard number (A890/A890M-13) and the specific grade or specification of the steel. It indicates that the key characteristics mentioned above are applicable to all the grades covered by the A890/A890M-13 standard. Each grade may have slight variations in chemical composition and mechanical properties, but they share the overall characteristics outlined in the standard.