Taigu ductile iron manhole cover in the course will inevitably rust, Taigu Chang in foundry to introduce you to a method for rust: projectile rust: shot blasting machine is to use a high-speed impeller blades rotating cast iron covers Shanxi brand, will abrasive surface dispersion fired ductile iron covers, abrasive high-speed flying, impact and friction surfaces of manhole covers, ductile iron covers the surface to remove rust and scale, etc., this method of high efficiency, good quality rust, but also make ductile cast iron covers the surface roughness in order to facilitate access to certain paint adhesion, low labor intensity, dyed lighter hollow of a tree on the environment, production plant should give priority to the use of such methods. Gu Chang-year foundry founded in 2006, is a new modern and dynamic enterprises. Since the construction of the continuous efforts to grow Shanxi cast iron manhole covers, is to become a professional production of ductile iron covers the company, with annual production capacity of 5,000 tons, is being expanded with an annual output of 10,000 tons. I would like to plant good quality, competitive price, Shanxi cast iron manhole cover price, timely delivery for the majority of merchants to provide high-quality service. Gu Chang in the production process of ductile iron foundry covers: 1. The chemical composition of the stringent requirements for carbon and silicon content of the original liquid iron requirements than gray iron, ductile iron to reduce the content of manganese, phosphorus and sulfur. 2. Make the ball handling, which was added to the iron ball agent. 3. Add inoculant were inoculation. 4. The liquid iron baked higher temperatures than gray cast iron, to compensate for the ball Shanxi cast iron covers, bred loss treatment temperature of molten iron. 5. ductile illiquid, shrink large, and therefore requires a higher temperature and larger casting gating system size, rational application of the riser, chills, using solidification principles. Shanxi cast iron covers brand _ Chang in foundry (certified) _ cast iron covers are provided by Taigu Shanxi 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.