LPHY caster wheels manufacturer specialized in customized office chair caster wheels for more than 25 years
Language
LPHY caster wheels manufacturer specialized in customized office chair caster wheels for more than 25 years
Industrial caster manufacturers generally choose higher heating and thermal insulation temperatures before forging the raw materials of the universal wheel, so as to make the Nb cementite and carbonitride produced by the molten steel in the whole process of rolling steel adequately heat-treated and tempered . For 0.5%C and 0.06%Nb forged steel, Nb chemistry is not easily heat treated and tempered thoroughly at the base heating temperature of 1250°C.
When the carbon content in the steel is lower, the Nb content of heat treatment and tempering at the same temperature is higher.
The solubility of the fine-grain strengthening elements in steel is not only affected by the carbon content, but also by the nitrogen content, but the solubility of the small and medium-sized fine-grain strengthening elements in the universal wheel is not very harmful. In addition, in the forged steel, under equilibrium conditions, basically all the precipitation of the universal wheel occurs in the martensitic temperature range, while the precipitation of HSLA steel (high toughness and high alloy steel) with low carbon and environmental protection content occurs in a lot of In the ferrite temperature region below 900°C, the size of the precipitates in the ferrite is fine, usually less than 10nm, which is beneficial for using its precipitation strengthening effect to improve the strength of the steel, while the size of the precipitates formed in austenite is smaller. Relatively coarse (20-50nm) which is beneficial for controlling the grain size.
The role of the microalloying elements in the universal wheel is to refine the grains, traditionally.
Industrial caster manufacturers use this to improve the strength and toughness of steel, and at the same time rely on the precipitation of microalloying elements to further improve the strength.
The common fine-grain strengthening elements in steel are TiNbV and Al. The effect of steel is generally based on precipitation strengthening to improve seamless splicing... The effect of small and medium-sized fine-grain strengthening elements in universal wheels is to optimize crystals to improve steel. Strength and toughness, while relying on the precipitation of microalloying elements to further improve the strength. The commonly used microalloying elements in steel are TiNbV and Al. The role of steel is generally to improve the strength of the universal wheel through precipitation strengthening, and the contribution of solid solution strengthening to the strength of steel is much lower, so these elements are used in industrial production. Sufficient consideration should be given to the solid solubility in the austenitizing process.
Compared with the flat steel with low carbon and environmental protection content, the medium carbon special steel usually has a high nitrogen content, so that a large capacity of TiN will inevitably be generated in the universal wheel. Because the solubility product constant of TiN is not large, this The large-capacity TiN precipitates and the primary precipitates caused by the steel in the whole process of coagulation are very harmful to the fatigue characteristics and ductility of the raw materials, so the limited content of the fine-grain strengthening elements should be limited. For CrMo-containing steel, when the Nb content is 0.09% and the carbon content exceeds 0.6%, there will still be a precipitation even under equilibrium conditions.
