There are many types of manhole covers in the market, but everyone thinks they are the same。 Today, Jinan Wanshun Casting Co。, Ltd。 will take you to have a deep understanding of the materials of manhole covers, right?
There are many kinds of well covers. According to the differences of materials used, there are differences in product functions and use occasions. Let's Take Shandong ductile iron well cover and cast iron well cover as an example to see what the differences between them are in the future.
As for the results of nodularization rate, it may be said that the same products of nodular cast iron are different in nodularization rate, quality and price. The reason why the nodularization rate is 85% is that the temperature of molten iron is low without good nodularization during forging, and the bearing pressure of the products can not reach the demand.
2. Cast iron manhole covers are made of indirect smelting of pig iron into molten iron without adding any auxiliary materials, and then pouring into manhole covers. However, nodular cast iron manhole covers are made of other metal alloys such as nodular agent and rare earth magnesium. Because nodular cast iron manhole covers are far superior to cast iron manhole covers in carrying capacity.
3. Nodular cast iron has high strength and good toughness. Rare earth ferrosilicon magnesium alloy and coke with low sulfur content are added during nodularization treatment, and the nodularization level is above level 3. Nodular cast iron is produced by adding inoculant and nodular agent in gray iron during smelting, so as to reduce the splitting of ferrite, increase the strength and improve the function.
4. The graphite of cast iron is flat and flat, and that of nodular iron is round. If the percussion of nodular cast iron is similar to the sound of percussion of carbon steel, the nodularization of nodular cast iron is good, while the percussion of gray iron sounds dull.
The above is Jinan Wanshun Casting Industry Co., Ltd. to take you in-depth understanding of the well cover materials have what introduction! For more information, please visit http://www.kpp647.com