7224.10.00.45 - Of tool steel

This HTS category, 7224.10.00.45, specifically classifies ingots and other primary forms of "other alloy steel" that are designated for use as tool steel. Tool steel, in this context, refers to alloy steels with specific compositions and properties designed for manufacturing tools, dies, molds, and similar applications where hardness, wear resistance, and the ability to hold a cutting edge at elevated temperatures are critical. The classification is based on the intended end-use and metallurgical characteristics that distinguish it from general-purpose alloy steels.

At this level, this category is distinguished from its sibling category, 7224.10.00.75, which covers "Other" ingots and primary forms of other alloy steel that do not meet the specific criteria for tool steel. The key differentiating factor lies in the specific alloy content and intended application that defines its "tool steel" designation, as outlined in Chapter 72 notes and relevant international standards.

As this is a leaf node within the HTS, there are no further subdivisions. Therefore, classification within this specific code relies on confirming that the material in its primary form (ingots, lumps, or similar shapes) is indeed "other alloy steel" and possesses the defined characteristics and composition for tool steel applications, as opposed to other alloy steels used in general manufacturing or construction.