(first made in Japan and China around 600-800 AC) are usually divided into the categories of carbon steels and alloy steels (including plastic mold steels).
Carbon steels are used extensively in Injection Mold China construction. they are those steels which ony contain iron and carbon, and small amounts of some other alloying elements. they are the most popular and cheapest type of steels used for tools. The three principal types of them used for tooling are very low carbon, medium carbon, and high carbon steels, Low density contains between 0.05 % and 0.7 % carbon. And high density contains between 0.7 % and 1.5 % carbon. As the carbon content is increased in carbon steel, toughness, the strength, and hardness also increase as soon as the metal is heat treated.
Plastic Mold are smooth, tough steels that are easily machined and welded. Due to thrie low carbon content, these steels can’t be hardened except by case hardening.Low carbon steels are well suited for the following applications: tool bodies, die shoes, handles, and situations which are similar where strength and wear resistance aren’t required.
Medium density are used where greater strength and toughness are required. Since medium’s have a higher carbon content they ought to be heat treated to make parts such as studs, axles, pins, and nuts. Steels in this group are much more costly as well as tougher to machine and weld than low density.
High density would be the most hardenable types and are used frequently for parts where wear resistance is a vital component. Some other applications where high density are well suited inclued drill bushings, locators, and wear pads. Since the carbon content of these plastic mold material in too high, parts made from high’s are normally difficult to machine and weld.
They are essentially material with additional elements added to alter the characteristics and bring about a predictable chang in the mechanical properties of then alloyed metal. They’re not usually used for most tools due to the increased cost of theirs, but some have found favor for special applications. The alloying elements used most often in steel are manganese, chromium, and nickel molybdenum.