2014.06.08 Shanghai Kai Fu Industrial Co. Ltd. (sales of P20 die steel www.xfmjgy.cn) information: with the development of the automobile industry and the industry competition intensifies between comprehensive mechanical performance and price, the automobile castings of the increasingly high demand, production and Application Research of so high ductile cast iron, has a very positive significance to improve the the product quality and competitiveness. In this study, starting from the actual production, by means of chemical composition, control of casting intensifying inoculation, especially the amount of adjustment of Mn elements of alloy, as cast pearlite and ferrite matrix ductile iron mixed with high grade, in reducing the production cost at the same time, greatly improve the quality of castings, and verified in transit singleton wheels production site. L manganese in ductile iron manganese can impede the decomposition of cementite and ferrite, in ductile iron with manganese and sulfur due to few, and mainly plays the role of stabilizing pearlite and carbides, the as cast pearlite increased and refinement. Manganese is also can be dissolved in ferrite, to strengthen the role of ferrite. 2014.06.08 Shanghai Kai Fu Industrial Co. Ltd. (sales of P20 die steel www.xfmjgy.cn) information: so, in casting production practice of ductile iron castings of high grade state, the amount of control is very important manganese, general process control in 0.4% - 0.6%, and is generally considered too high content of manganese in ductile iron segregation, will reduce the impact toughness of castings. In this study, the traditional production of breakthrough in ductile iron manganese amount limitation, used to increase the amount of manganese, comprehensive mechanical properties to meet the requirements of as cast high grades of ductile cast iron. 2 test results and analysis of 2.1 test results of manganese content changes on the properties and microstructure of ductile iron sample mechanics as shown in table L. From Table L specimens of Cll, C12, D11 can be seen, the manganese content increased from 0.48% to 1.2%, the strength is increased from 473MPa to 738MPa, the hardness is increased from HBl70 to I - IB240, while the elongation decreased from 21.86% to 5.3%. Therefore, in raising the carbon content, make sure the ball, increase breeding conditions, the manganese content in O.7 and O.9% can produce QT500 - 10, QT550 - 7, the manganese content in the 0.9 - 1.1% range can produce QT600.5, QT700.3. Impact of changes in table lMn addition on the mechanical properties. 　　2014.06.08上海偕富實業(yè)有限公司（銷售P20模具鋼www.xfmjgy.cn）的資訊：隨著汽車工業(yè)的發(fā)展和產(chǎn)業(yè)間競爭的加劇，對汽車鑄件的綜合機械性能及性價比的要求越來越高，因此高牌號鑄態(tài)球墨鑄鐵的生產(chǎn)應(yīng)用研究，對提升產(chǎn)品質(zhì)量和競爭力具有十分積極的意義。本研究從生產(chǎn)實際出發(fā)，通過控制鑄件的化學成分，強化孕育，尤其是調(diào)整Ｍｎ元素的合金化加入量，獲得鑄態(tài)珠光體－鐵索體混合基體高牌號球墨鑄鐵，在降低企業(yè)鑄件生產(chǎn)成本的同時，提高鑄件的產(chǎn)品質(zhì)量，并在全順單胎輪毅的生產(chǎn)現(xiàn)場得到驗證。ｌ錳在球墨鑄鐵中作用錳能阻礙滲碳體和鐵素體的分解，在球鐵中由于錳很少與硫結(jié)合，而主要起穩(wěn)定珠光體和碳化物的作用，可使鑄態(tài)下珠光體增加并細化。錳還可固溶于鐵素體，起強化鐵素體的作用。