In terms of chemical composition and physical properties, nodular cast iron is still higher in tensile and elongation than gray iron。 The target of ultimate load pressure head decides that ductile iron should be higher in other materials。 Nowadays many manholes are faced with the appearance of theft, because ductile iron has a certain value of recovery。
Ductile iron covers and gray iron covers are the same, but their raw materials are different. Its weight is lighter than that of gray iron, high strength and good durability, and its corrosion resistance has been improved, so it is acid resistant, alkali resistant and chemical resistant.
In terms of anti-theft, our ductile iron has made an excellent improvement。 It is used in the form of a dark door, which is connected by a fixed hole and a spring shaft and a thrust fixed card。 A special lock is inserted and rotated clockwise for ninety degrees。 This can complete the state of active locking。 More concise, strong, reliable and convenient。
Comparing with the brittleness contrast of the traditional gray iron manhole cover, the appearance of cracking will happen very simply. The main properties of ductile iron and gray iron are compared. During the construction of the ductile iron shaft cover, the shaft cover and the rainwater grate should be made flat and lubricated with the appearance of the support. There must be no cracks and influence on the cold septum, shrinkage and loosening of the performance of the cover.
This article is provided by the Shandong ductile iron shaft cover for you. Our website is: http://www.kpp647.com we will provide you with more quality service and welcome your visit with wholehearted enthusiasm.