One code system is the AES system. It’s a 4-digit code where the first 2 numbers indicate the type of steel. Search online to find an identification chart that explains what these numbers mean. [1] X Research source The ASTM system is used on rebar. The first number in the code represents the size of the bar, while the letter under it indicates the type of steel. [2] X Research source
Stainless steel is a hard metal that typically won’t get corroded or damaged. Metal that has a red or yellow tint is copper or brass, not steel. Copper may also turn green as it ages.
Hold the metal in place with clamps or vice grips before attempting to chip it.
Other magnetic metals are either rare or not used in pure forms. Cobalt and nickel, for example, are often components in steel. Some stainless steel is not magnetic. When nickel is added during manufacturing, the magnetism fades. Identify this metal by color, by weight, or by trying another test.
To get used to the differences between these metals, compare household objects. For example, an aluminum can feels much different than a steel cup or utensil.
In contrast, lead, aluminum, silver, and many other metals are softer than steel. Wearing them down with the file is easier. Hardened steel, which has a medium to high carbon content, is stronger than all but a few metals. Most metal files won’t affect it.
Steel-toed boots are also a good idea. Wear these in case you drop a heavy piece of metal.
Adjust the metal’s position until you get a clear view of the spark pattern.
Both wrought iron and stainless steel produce long, even yellow streaks. The leaves on the end are smaller in stainless steel sparks. Steel made with less carbon produces yellow sparks with different lengths. The leaves on the end fan out more with a lot of extra little branches. Steel with high amounts of carbon produce sparks that begin spreading out near the grinding wheel. The sparks are duller or even red and fan out less at the end. Some metals, including nickel and aluminum, produce few or no sparks.
