Product Introduction

What are the advantages of ductile casting instead of steel casting

In 1949 as a substitute for steel casting nodular casting appeared, but did not think that nodular casting as a substitute for steel casting, its carbon content can actually be higher than steel casting, this improved sphere makes nodular casting than cast iron and steel have more excellent physical properties. Moreover, it is precisely because of this spherical microstructure of carbon that the ductile casting has better ductility and impact resistance, so all the pressure loaded parts of Nibco ductile casting are processed through the ferritizing annealing cycle.

The yield strength of ductile castings is as low as 40k and the yield strength of steel castings is only 36k, and the strength of ductile castings and cast steel is comparable to ductile castings with higher yield strength. The corrosion resistance and oxidation resistance of ductile casting are more than that of cast steel. Due to the spheroidal graphite microstructure of spheroidal graphite castings, the vibration capacity of spheroidal graphite castings is weakened, which is better than that of cast steel, so it is more conducive to reducing stress. An important reason for choosing ductile castings is that ductile castings cost less than cast steel. The low cost of ductile castings makes this material more popular, the casting efficiency is higher, and the machining cost of ductile castings is also reduced.

Ductile casting also has much higher tensile, plasticity and toughness than ordinary gray cast iron, ductile casting in addition to similar to gray cast iron good shock absorption, wear resistance, cutting soil and casting soil art. Tensile strength up to 1200~1450MPa elongation up to 17% impact toughness up to 60J/cmz, so has been used to produce complex forces, tensile, toughness and wear resistance and other high requirements of parts, such as automobiles, tractors, internal combustion engines, crankshaft, camshaft, and general machinery of medium pressure valves.

Nodular casting is the liquid iron through the nodulating agent treatment rather than after heat treatment. Sometimes a small amount of cast iron is flocculent. However, the matrix form of nodular casting can be changed after a certain heat treatment, and the matrix form of nodular casting is: ferrite, pearlite, ferrite plus pearlite, bainite, austenite plus bainite.

Ductile casting with the development of science and technology and the improvement of people's living standards. An important sign of the comprehensive strength of the machine tool industry. The quality of nodular ink castings mainly includes appearance quality, internal quality and use quality. The appearance quality of machine tool nodular casting refers to the general roughness, general defects, size deviation, shape deviation and weight deviation of machine tool casting. The intrinsic quality of machine tool castings mainly refers to the chemical composition, physical properties, mechanical properties, metallographic structure of machine tool nodular castings and the holes, cracks, inclusions, segregation and other conditions existing in machine tool castings. The use quality of machine tool nodular ink castings refers to the working durability of machine tool castings under different conditions, including wear resistance, corrosion resistance, cold heat resistance, fatigue, shock absorption and other properties as well as machinability.

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