Gu Chang-year foundry with you briefly why choose cast iron manhole covers? Cast iron covers a very small impurities in the three anti-ductile manhole covers, will not corrode as easily as ordinary covers or no toughness no strength, cast iron covers a very long service life. Gu Chang-year foundry founded in 2006, is a new modern and dynamic enterprises. Since the construction of the continuous efforts to grow and ductile covers, is to become a professional production of ductile iron covers business, the annual production capacity of 5,000 tons of ductile covers companies with an annual output of 10,000 tons is being expanded. Gu Chang-year foundry with you introduce technical standards ductile manhole cover:. 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 supply ductile manhole covers, tie a gap of 3 mm. b. Manhole covers tensile strength greater than 500N / mm, hardness standards HB190-230. Covers pressure to meet the Ministry of Construction CJ / T3012-93 "cast iron manhole covers," the industry standard, heavy covers pressure 360KN, 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. Ductile covers manufacturers | Chang in foundry (certified) | Xinjiang ductile manhole cover provided by Gu Chang in foundry. Gu Chang-year foundry (www.sxcnzz.com) is Jinzhong, machining leader, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Chang-year leadership in the foundry staff warmly welcome all inquiries negotiations to create Chang foundry in a better future.