Gu Chang-year foundry ductile iron covers features: (1) decorative effect, choice of color, you can design and strong. Products can be made into a variety of covers given different shapes and purposes. (2) resistance, high / low temperature, insulation, good corrosion resistance. Products at low temperature -40 ℃, 250 ℃ high temperature in normal use, does not affect performance. Product is electrically insulating, corrosion resistance, never rust. (3) easy to open, no harsh noise. Product is not lockable covers, easy to harsh noise and no rebound phenomenon open when the car ran over. Ductile iron covers features! Welcome to buy! Gu Chang-year foundry with you introduce ductile covers technical standards:. A ductile iron Manhole covers material diameter sealing range of plus or minus 2 mm, height Manhole covers and with an accuracy of plus or minus 1 mm, with a gap of 3 mm. b. Manhole covers tensile strength greater than 500N / mm ductile cast covers, hardness standards HB190-230. Covers pressure to meet the Ministry of Construction CJ / T3012-93 "cast iron manhole covers," the industry standard, heavy-duty covers much money 360KN pressure casting covers, light covers 210KN. cT using EPDM rubber ring, performance indicators heavy national standard GB-7529-87. d. anti-theft feature is well connected by a fixed shaft and seat covers, on the other side with a pin fixed this method to complete, with a strong anti-theft and anti-cavitation erosion. Covers casting manufacturers, Datong covers casting, foundry chang year by year Taigu Chang foundry. Gu Chang-year foundry (www.sxcnzz.com) strong, credible, in Jinzhong machining industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead Chang and you work in the foundry into the brilliant, for a better future!