At present, China’s high-grade CNC machine tools needed in important fields such as automobile, aviation, railway and national defense depend on imports for a long time. The poor machining accuracy and precision retention of machine tools is one of the important reasons why they can’t resist imports. Cast iron...
For a long time, the cylinder block and cylinder head have been made of gray cast iron. Due to the demand of energy saving and lightweight, some enterprises use Al alloy to manufacture the cylinder block and cylinder head, which greatly reduces the casting quality and reduces the fuel...
The chemical composition of gray cast iron consists of two parts: one is the basic composition, that is, five elements: C, Si, Mn, P and S; Second, a small amount of alloy elements such as Cu, Cr, Mo, Ni, Sb, Sn, etc. are added as required. Among the five...
With the development of the automobile industry, the exhaust temperature of the engine is increasing continuously, which leads to the continuous development of the exhaust manifold materials.Material of exhaust manifold for automobiles in developed countries in Europe and America has experienced the development process of stainless steel, including common...
Based on the above description of graphite distribution shape, the following conclusions can be drawn: (1) F-type graphite is only found in specific iron castings, but not in general iron castings. (2) C-type graphite weakens the matrix greatly, and there is no primary austenite dendrite in hypereutectic cast iron,...
1. Characteristics of inoculation treatment Up to now, there is no agreement on the mechanism of inoculation treatment at home and abroad, but the inoculation treatment of cast iron has the following commonness : (1) Furnace front performance and fluidity. Inoculation treatment is generally to add inoculant into molten...
The chemical composition of grey cast iron is composed of two parts: one is the basic composition, i.e. the five elements of C, Si, Mn, P, s; the other is to add a small amount of alloy elements, such as Cu, Cr, Mo, Ni, Sb, Sn, etc., as required...
1. Electrochemical test The results of electrochemical polarization test of grey cast iron and nodular cast iron are shown in Figure 1. According to the polarization curve, solid grid and hollow triangle correspond to gray cast iron and nodular cast iron respectively. Cview2.0 is used to analyze the tafei...
Graphite in grey cast iron is flaky, and its distribution shape can be divided into a, B, C, D, e and F. Different distribution shapes have different effects on the mechanical properties, service properties, physical properties and technological properties of gray cast iron. The graphite distribution shape of gray...
In recent years, although nodular iron castings, vermicular iron castings and various light alloy castings have been developed rapidly, but due to the unique advantages and relatively cheap price of gray iron, its consumption is still large, and its application is still very wide. Therefore, further strengthening the research...