Manhole Cover with frame

ductile iron manhole cover with frame for CW2 and CW3 Material: ductile iron GGG50 and grey iron GG20 Used for commuinication

DUCTILE IRON WELL COVER OF MAIN FEATURES1 High strength: Tensile strength ó b≥420MPa,Yieid strength ó s≥300MPa,the properties is the same to low carbon steel, and 3 times to gray iron materials. 2 Good toughness: The impact value is same to mid-carbon steel and 10 times over to gray iron mate rials.3 Good plasticiey: The elongation rate ó≥7%,it is similar to high carbon steel but gray cast iron elongation is close to zero.4 Strong Anti-corrosion: The spary water corrosion test shown that its corrosion rate is only 1/40 of the steel pipes, 1/10 of the gray iron pipes. Its use life is 2 times to gray iron pipe, 5 times to common steel pipe.