Weihai cast iron pipe fittings, cast iron pipe fittings manufacturers in Shandong Changyi, provided by the Yangtze River Yangtze casting foundry. Changyi City, Shandong Province, the Yangtze River Foundry (www.changjiangzhuzao.com) Shandong Weifang quality certified company Commercial Union, with the Yangtze River and other brands, has a good reputation, honesty, service-oriented "business alliance Service" icon on the page, We will be happy to serve you! There is always between ductile iron pipe fittings companies within the industry is competitive, but the competition between different companies within the industry ductile iron pipe fittings the intensity is not the same, some more intense, some by more moderate, mainly in the following influencing factors: ductile iron pipe fittings industry enterprises quantity structure, under normal circumstances, the greater the number of ductile iron pipe fittings business, more competition, although sometimes a small number of ductile iron pipe fittings business, but evenly matched, comparable strength will generate competition. Industry growth rate, a long time when the industry is in rapid habitat, expanding market demand, competition is not very intense, when the slow development of the industry, the market is likely limited, ductile iron pipe fittings business competition more intense. Fixed costs and inventory costs, the industry produced when high fixed costs and inventory costs Shandong Changyi manufacturers of cast iron pipe fittings, ductile iron pipe fittings throughout the enterprise to reduce costs will inevitably increase production, reduce inventory, causing price competition, plus fierce competition environment degree. Product characteristics, if ductile iron pipe fittings within the industry enterprise products have their own characteristics, the difference is large, each have a different user, the competition will be more moderate. Users transition costs cast iron pipe fittings manufacturer, if the user purchases another company's products ductile iron pipe ductile iron pipe fittings from the purchase of a corporate transformation products to the higher cost, the competition is more moderate. Exit barriers, is the ductile iron pipe industry enterprises to withdraw from consideration to be paid for, if not with the loss of assets, goods handling and inventory losses of intangible assets. When eliminating casting white graphite annealing temperature casting cooling, surface and thin section was often produce white. White tissue hard and brittle, poor processing performance, easy to peel. Therefore must be annealed (or normalized) method to eliminate white tissue. Annealing process is: heated to 550-950 ℃ heat 2 ~ 5 h, followed by furnace cooling to 500-550 ℃ and then cooled baked. During high temperature insulation Changyi cast iron pipe fittings price, free and eutectic cementite infiltration and secondary cementite eutectic cementite decomposition also occurred graphitization process. Since the cementite improve the mechanical properties of castings. Sometimes normalizing also ductile iron surface hardening on organizational preparation, normalizing of high temperature and low temperature normalizing normalizing. High temperature normalizing temperature generally does not exceed 950 ~ 980 ℃, low temperature normalizing usually heated to a temperature range of fold 820 ~ 860 ℃. After normalizing the general need to be tempered in order to eliminate the internal stress generated when normalized to achieve casting white rocky annealing temperatures.