FERROUS vs NONFERROUS MATERIALS

Ferrous Material: “SA”

A ferrous material refers to a metal or alloy in which iron (Fe) is the principal constituent, typically comprising more than 50% of the composition. These materials are characterized by their magnetic properties, strength, and tendency to corrode (rust) in moist environments unless protected. Common examples include wrought iron, cast iron, carbon steels, alloy steels, and stainless steels.

ASME Ferrous material designations begin with “SA” such as SA-106, SA-335, or SA-516.

ASTM Ferrous material designations being with “A” such as A106, A335, A516.

Non-Ferrous Material: “SB”

A nonferrous material refers to a metal or alloy that does not contain iron (Fe) as a principal or appreciable component in its composition. These materials are distinguished from ferrous metals (like steel and cast iron), which are primarily iron-based and prone to rusting. Common examples include aluminum, copper, nickel, titanium, zinc, and their alloys, valued for properties such as corrosion resistance, lightness, and conductivity.

ASME Non-Ferrous material designations begin with “SB” such as SB-111, SB-168, etc.

ASTM Non-Ferrous material designations begin with “B” such as B111, B168, etc.