It is useful where sanitation and cleanliness are important. Non magnetic in the annealed condition. Hardness and tensile strength can be increased by cold working, but modified by lowered carbon content providing good resistance to corrosion in welded construction where subsequent heat treatment is not practical.

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Engineering Steel is a steel that has had small amounts of one or more alloying elements (other than carbon) such as such as manganese, silicon, nickel, titanium, copper, chromium and aluminum added. This produces specific properties that are not found in regular carbon steel.

Grade 304L (L= low carbon) is the same as the 304 except it has an extra-low-carbon analysis, the advantage of which is that it precludes any harmful precipitation in the 800º F to 1500º F range, such as might otherwise occur in welding heavier sections.

Geometries including triangle, square, round, polygon and rhombus are standard. All of the insert geometries are symbolized using the alphabet.

For example, an inscribed circle of 9.525 mm (3/8 inch) is represented by the symbol 3. An inscribed circle of 12.70 mm (4/8 inch) is shown as 4.

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Engineering Steels are workhorses of industry because of their economical cost, wide availability, ease of processing, and good mechanical properties. Alloy steels are generally more responsive to heat and mechanical treatments than carbon steels.

The symbol represents the clearance angle of the insert used. An insert with a 0° clearance angle, which is shown by the symbol N, is called a negative insert. An insert with a clearance angle other than 0° is called a positive insert. Many turning inserts have clearance angles shown by symbols N, C and P.

However, for the metric coding, the diameter of an inscribed circle is represented by the cutting edge length using a two-digit number. Therefore, even if the inscribed circle is the same , the symbol for the cutting edge will vary.