We all know that the stainless steel cast iron manhole cover has many excellent characteristics, such as high compressive strength, plastic deformation, ductility, wear resistance, heat resistance or ultra-low temperature, corrosion resistance and specification reliability. But even so, it is very easy to burst when the average temperature in winter is relatively low. So how to prevent it?
For the ductile iron manhole cover grate itself, the harm is not very great under a certain average temperature. Because the well cover grate has good ductility, compressive strength of steel and tensile strength, the well cover grate can operate well under ultra-low temperature in winter.
However, the bursting of nodular cast iron grate can not be avoided. If you want to reasonably prevent it, the key lies in the hydrodynamics materials in the grate of nodular well cover. If the zero boundary point of hydrodynamics is relatively low, you can add concrete antifreeze appropriately or carry out appropriate thermal insulation for the grate of nodular well cover to prevent bursting at a lower temperature in winter.
There is also a countermeasure to reduce the bursting probability of cast iron grate in winter, that is to select raw materials with good ultra-low temperature cold resistant materials to make nodular cast iron manhole cover grate, and there must be high technical countermeasures in the manufacture, so that it can work well at ultra-low temperature.
以精 密鑄件皮帶盤為例，鑄鋼件用到的更多一些，由于球墨鑄鐵篦子商品出成率沒有灰鐵高，且事后生產加工也比灰鐵要難。球墨鑄鐵井蓋篦子的加工過程中，在調質處理、拋丸除銹清 除后或機械加工常常會發覺一些孔眼，嚴重危害了商品的品質。鑄鋼件具備優良的鍛造特性、減震性、耐磨性、鉆削生產加工特性及其低的空缺敏 感度，特別適合用于鍛造皮帶盤。
Taking the belt pulley of precision casting as an example, steel castings are used more. Because the commodity yield of nodular cast iron grate is not as high as that of gray iron, and the post production and processing is also more difficult than that of gray iron. During the processing of nodular cast iron manhole cover grate, some holes are often found after quenching and tempering treatment, shot blasting and rust removal or machining, which seriously endangers the quality of goods. Steel castings have excellent forging characteristics, shock absorption, wear resistance, drilling production and processing characteristics and low vacancy sensitivity. They are especially suitable for forging belt pulley.
The above is the detailed introduction of Shandong ductile iron manhole cover. I hope it will be helpful to you If you have any questions, please contact us We will provide you with professional service http://www.djse94se.com