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Die steel role of various ingredients
Nov 13, 2017

Die steel role of various ingredients

Put simply: Steel is an alloy of iron and carbon. The other ingredients are made to make the steel performance different. The following are the main chemical composition of the role of the mold steel, mold steel so that further understanding of a greater help:

Carbon (C) - is present in all steel and is the most important hardened element. Helps to increase the strength and hardness of the steel, but reduces its ductility and toughness. We usually want steel at the tool level to have more than 0.5% carbon and become high carbon steel.

Silicon (Si) - as a commonly used deoxidizer, has a strong deoxidation ability. The solid solution strengthening effect of ferrite is second only to phosphorus, improve the electrical resistivity of steel, reduce the hysteresis loss, and also improve the magnetic permeability, which is the main alloying element of silicon steel. Improve the hardenability and tempering resistance of steel, the comprehensive mechanical properties of steel, especially the elastic limit of the favorable. Si plays a major role in spring steel to increase the elasticity of the steel.

Chromium (Cr) - increase the hardness of mold steel, punching material, strength, the most important is the corrosion resistance, Cr content of 13% or more of the stainless steel. Despite this, all steels will rust if not properly maintained. S136 die steel, FS136 die steel containing about 12% chromium, so its corrosion resistance is particularly good.

Manganese (Mn) - In the mold steel melt in ferrite and cementite, the strength of the steel, the hardness increased. In addition, due to the affinity of Mn and S is greater than the affinity of iron and sulfur, you can take part of the harmful sulfur, the formation of high-melting MnS (higher than 1600 degrees), thereby reducing the harmful effects of S on the steel.

Molybdenum (Mo) - the most capable of suppressing austenite to pearlite transformation, increases the hardenability of tool steel and is one of the most important alloying elements for bainitic high strength steels. Content of about 0.5% can reduce or inhibit the temper brittleness caused by other alloying elements. At higher tempering temperature, the formation of a special dispersion of the carbide, a secondary hardening, to improve the hot strength and creep strength of the mold steel.

Vanadium (V) - enhances abrasion resistance and ductility. A vanadium carbide is used to make streaked steel. In many types of steel contains vanadium, including Cr12Mo1V1 containing 1% vanadium, can improve the hardenability of die steel, wear resistance, improve service life of tool steel.

Nickel (Ni) - The role of solid solution strengthening and improve hardenability. Grain refinement of ferrite grains, in the same intensity under the conditions to improve the plasticity and toughness of steel, especially low temperature toughness. With chromium, molybdenum and other joint use to improve the steel's thermal strength and corrosion resistance. 718 is an improved version of P20, 718 is based on the P20 plus Ni, improved die steel plasticity and toughness.

Tungsten (W) - Mainly increases the red hardness and wear resistance of steel. Tungsten is mixed with a suitable proportion of chromium or manganese to make HSS. High-speed steel SKH-9 contains a lot of tungsten.

Phosphorus (P) - Under normal circumstances, phosphorus is a harmful element in the mold steel. Phosphorus (P) element can increase the cold and brittleness of the mold steel and deteriorate the weldability of the mold steel. The plasticity of the mold steel is reduced so that the mold steel The cold bending performance deteriorates. Therefore, it is usually required that the content of phosphorus in the mold steel be less than 0.03% and the quality mold steel require lower. Phosphorus, sulfur and manganese elements combined to increase the ease of steel.

Sulfur (S) - is also a noxious element in general. Sulfur (S) element causes the mold steel to generate hot brittleness, which reduces the ductility and toughness of the mold steel and causes cracks during forging and rolling. Sulfur (S) element on the mold steel welding performance is also unfavorable, reducing its corrosion resistance. Therefore, sulfur content is usually less than 0.055%, high-quality steel requirements of less than 0.040%. However, adding 0.08-0.20% sulfur in the mold steel can improve the machinability, said cutting steel easy to die.

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