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Basic knowledge of nodular cast iron

by:XEX     2021-02-11
Therefore, the strength of the nodular cast iron are much higher than the gray cast iron. Gray cast iron graphite in the organization exists in the sheet, nodular cast iron graphite exists in the sphere of organization. National standard of grey cast iron general representation method is: HT150, HT200, HT250, etc. , here the first capital letter abbreviation HT for gray cast iron, the tensile strength of 150 refers to the parts, the representation method of grey iron pieces in jis standard for GGG15 / GGG20 / GGG25 / GGG30 and so on. The representation method of national standard of general nodular cast iron is: QT400 - 15日,QT400 - QT 18, etc. , here the first capital letter abbreviation for ductile iron, the tensile strength of 400 refers to the parts, 15, 18 refers to the elongation. A lot of representation foreign nodular cast iron, the European standard EN - 数次, 400 - 15/18, Germany standard grades of GGG40 / GGG40 in nodular cast iron. 3 / GGG50 etc. Organizational differences lead to their performance also has a huge difference: low strength of gray cast iron, plastic, Flake graphite fracture matrix, cause stress concentration) , large brittleness, good damping performance. Mainly used to produce some strength requirement is not high, main compressive stress under various box base, etc. Nodular cast iron: spherical graphite to minimize the effect on matrix of fragmentation, minimum stress concentration effect, so its strength is very high, can and medium carbon steel gas beauty, can give full play to the performance of the matrix, and have good plasticity and toughness. Commonly used to make some require high tenacity and complicated shape, Casting performance is better than steel, but is worse than gray cast iron) Artifacts, such as parts of internal combustion engine crankshaft and connecting rod, etc. Nodular cast iron can also commonly after heat treatment to strengthen, after heat treatment and gray cast iron is generally unable to improve the intensity ( The influence of flake graphite) 。 First of all you to know the difference of the two kinds of material nature: graphite gray cast iron organisation exists in the sheet, nodular cast iron graphite exists in the sphere of organization. Low strength of gray cast iron, plastic, Flake graphite fracture matrix, cause stress concentration) , large brittleness, good damping performance. Is mainly used to produce some parts strength requirement is not high, the spherical graphite to minimize the effect on matrix of fragmentation, minimum stress concentration effect, can give full play to the performance of the matrix, and have good plasticity and toughness.
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