Sampling device and sampling method for accurate quantification of carbon content in spheroidal graphite cast iron

Abstract

The invention discloses a sampling device for accurate quantification of carbon content in spheroidal graphite cast iron and additionally discloses a sampling method using the sampling device for the accurate quantification of the carbon content in the spheroidal graphite cast iron. According to the technical scheme of the invention, the sampling device for the accurate quantification of the carbon content in the spheroidal graphite cast iron comprises a sampling base and a sampling handle. A sampling cavity is arranged on the sampling base. The wall surface of the sampling cavity is a spherical crown surface. The sampling handle comprises an operating handle and a sampling ball. The sampling ball is connected with the bottom end part of the operating handle. The diameter of the sampling ball is the same as the diameter of the sampling cavity. By using the device, the precision of carbon content detection is improved, the operation is convenient and the shrinkage trend of castings is reduced.

Description

technical field [0001] The invention discloses a sampling device for precisely quantifying the carbon content of the nodular cast iron, and also discloses a sampling method using the sampling device for precisely quantifying the carbon content of the nodular cast iron. Background technique [0002] Wind power castings are installed at an altitude of tens of meters or even hundreds of meters, and the working temperature is low. In some areas, the working temperature is from -20°C to -40°C. Excellent low temperature impact toughness, and requires strict ultrasonic and magnetic particle non-destructive testing. [0003] During the solidification process of the casting, due to the liquid shrinkage and solidification shrinkage of the alloy, shrinkage porosity and shrinkage cavity often appear in the final solidification part of the casting. For ductile iron castings, since the solidification method is mushy solidification, it is difficult to obtain subsequent replenishment of mo...

AI Technical Summary

Problems solved by technology

Since the chemical composition of each ladle of molten iron cannot be exactly the same, the effect of spheroidizing treatment and inoculation treatment will not be the same, so the number and size of graphite spheres after solidification will also vary. These factors will affect the cuttings sampling. The fluctuation of graphite loss, therefore, it is difficult to judge the real carbon content of ductile iron castings only from the carbon content results obtained by chemical analysis based on the above drilling cuttings sampling method

The data of carbon content analyzed by direct-reading spectroscopic analysis is also unstable and has poor repeatability

Although the data stability obtained by the thermal analysis calculation method is better than that of the direct-reading spectral analysis method, since the data of Si and P still come from the direct-reading spectral analysis method, there is still a certain volatility, which makes it impossible to use spheroidal ink during smelting and production. The carbon equivalent of cast iron is stably controlled at the upper limit of the allowable range

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