Research on the Standard Notch of Refractory Products

For wedge-shaped bricks, the dimensions of each side are measured in the same way as straight bricks, but the inspection requirements for wedge difference are increased. This is different from the international standard. The revision of this test item is due to the fact that some products standards in China have already increased the assessment of this indicator. Distortion consists of two basic types, convex and concave. When checking, steel wedge ruler should be preferred. In addition, it also retains the traditional feeler gauge used in China. Inspection of rib-corner defects and other surface defects In recent years, the indication method for the standard missing corners and missing ribs of the products of China's manufactured refractory products has been changed from the depth method to the sum of three sides.

The new standard is equivalent to using the trilateral sum method of ISO 12678-2:1996 to check for missing corners and missing edges. In the measurement, the positioner is used to determine the position of the edge defect. The flat edge of the steel is used to determine the edge of the missing corner, and then the value is read directly from the steel tape measure or steel ruler. The inspection of the fused hole deleted the original standard about the void formed by the organic inclusions, and stipulated that the fused hole was represented by the average value of the maximum diameter and the minimum diameter. The depth of the hole was measured and the depth of the hole was measured with a depth gauge.

The inspection method for surface network cracks was modified from the perimeter method to the area method in the International Standard. Seth's specifications also increase the 0.2mm specification for crack classification in international standards. The inspection of the surface protrusion adopts the international standard inspection method, namely the steel flat wedge rule method. The method of checking the indentation is the same as the method of checking the distorted concave surface. The inspection method of flash is also not listed in the original standard. The new standard makes reference to the method of the international standard and uses the sounding gauge or steel (roll) ruler to measure.