我們都知道，不銹鋼鑄鐵井蓋具有許多優異的特性，例如較高的抗壓強度、塑性變形、延展性、耐磨性能、耐熱或超低溫、抗腐蝕及其規格可靠性這些，但就算是這般，它在冬季平均氣溫較為低的情況下也非常容易產生爆裂，那么如何防止呢?
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?
針對球墨鑄鐵井蓋篦子自身而言，在一定的平均氣溫下危害并非挺大。那由于井蓋篦子有不錯的延展性，又有鋼的抗壓強度，有不錯的拉伸強度，促使井蓋篦子在冬季超低溫下還可以優良的運作工作中。
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.
但球墨鑄鐵篦子爆裂也無可避免，要想合理防止得話關鍵還是在于球墨井蓋篦子中流體力學的物質，假如流體力學零界點較為低，能夠根據適度添加混凝土防凍劑，或是是對球墨井蓋篦子開展適度隔熱保溫解決，來防止在冬季較低溫度爆裂。
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.
也有一種對策可以降低鑄鐵篦子在冬季的爆裂概率，那便是挑選具備不錯超低溫抗冷材料的原材料制做球墨鑄鐵井蓋篦子，而且在制做中必 須有較高的技術性對策，那樣能夠使其在超低溫下優良工作中。
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.
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