The requirements of small and medium-sized steel bar and rod rolling mills for rolling rolls are very strict, and the rolling rolls of different materials have different requirements. Generally, when selecting the roll material of the rolling mill, the materials of high wear resistance, corrosion resistance and thermal shock resistance should be selected. In order to meet the technology requirements of small and medium-sized steel bar and rod rolling mills for rolling rolls in many production processes, the selection of rolling rolls often adopts the following materials: chrome molybdenum alloy steel, high chromium wear-resistant cast iron, and tungsten carbide composites.
Firstly, chrome molybdenum alloy steel is a kind of high hardness, high toughness and wear-resisting material. It usually contains about 0.3% to 0.9% molybdenum, 0.3% to 1% chromium and 0.3% to 1% carbon. This kind of material is often used to produce symmetrical rolls and asymmetrical rolls in cold rolling mill, which can improve wear resistance, reduce wear, and improve the service life of rolls in rolling process.
Secondly, high chromium wear-resistant cast iron is a kind of alloy with high chromium content and relatively low carbon content. It has high hardness, strong wear resistance and good plasticity in a certain range, and the wear-resisting performance is better than ordinary cast iron. Due to its characteristics, high chromium alloy cast iron roll is usually used for the production of skew rolling mill rolls and rolling mill rolls, and its wear resistance is much higher than that of chrome molybdenum alloy steel and other materials.
In addition, carbide composite materials are often used as rolling rolls during rolling. This kind of material is composed of tungsten carbide pads bonded on the matrix material. Its advantages are high hardness, high breaking strength, high wear resistance and good thermal stability. This kind of material is usually used in the production of small-medium size steel bar and rod with lower hardness, because the wear resistance and toughness of this material are very good.
In conclusion, when selecting the roll material of small and medium-sized steel bar and rod rolling mills, it is necessary to consider the working environment and production requirements. In order to make rolls have better wear resistance and rolling performance, it is necessary to select suitable material according to different working environment and production requirements, such as chrome molybdenum alloy steel, high chromium wear-resistant cast iron, and tungsten carbide composites. Only in this way can we ensure the stability of the production and the quality of the products.
