Inspection method of refractory brick size, appearance and section

1. The sampling and acceptance of refractory products shall be carried out according to the requirements.
2. Two inspection methods for the same inspection item in this standard have the same status, but one inspection method shall be identified according to the product technical requirements.
3. Other defects at edges and corners shall not be assessed according to relevant defects within the allowable range of missing corners and edges.
4. Except as specified in this inspection method, the samples taken in the acceptance inspection shall not be processed or deducted from the taper of the products due to forming, and shall be kept in the original state. Defects caused in the process of inspection shall not be counted as defects.
5. The tools and instruments used in the inspection shall be based on the special tools for the size, appearance and section inspection of refractory products kept by the quality inspection department, and shall be calibrated and approved regularly to ensure the accuracy of the inspection tools.

Refractory brick inspection method

Size inspection

1. The size inspection should be carried out according to the order drawing.
2. When measuring, the zero point of the steel ruler must be aligned with the edge of the product. Steel tape or steel ruler can be used. When measuring the inner and outer diameter of the product, use a tool caliper.
3. For general products (except for special regulations), measure the size of the middle third of each side of the product as the standard.
4. The measurement of the opposite side of the product is based on the difference between the two opposite sides of the same size of the product. The measurement of the relative margins of the product’s child and mother diameters is based on the difference between the long and short axis of the same child or mother mouth of the product.
5. As long as the tolerance value is expressed as a percentage, its value should be calculated up to an integer, and the calculation of one digit after the decimal point shall be carried out in accordance with the “Rule of Value Rounding”.

Inspection of molten cave

1. When inspecting molten holes, first use a metal hammer to tap the molten holes and significant discoloration parts on the surface of the product due to low melting substances, and then measure the maximum diameter of the molten holes with a steel ruler.
2. The voids caused by foreign organic inclusions such as wood chips, sludge, cloth pieces, etc., are also inspected according to the molten hole inspection method, but the allowable value is not more than 1 times the product’s molten hole value (for example: the molten hole value The specified value is 8 mm, and the value of the cavity is allowed to be no more than 16 mm).

The inspection of missing corners and edges

(1) For the inspection of the missing corner and the depth of the missing edge, use a specially manufactured goniometer and edge detector that can be tightly fitted on the edges and corners of the product, with a scale that slides in the specified direction.

(2) The depth of the missing corner, for right-angled products, use a cube-shaped goniometer to measure along the diagonal of the center of the cube; for non-right-angled products, use a Mitsubishi-shaped goniometer to measure along the centerline of the Mitsubishi. .

(3) The depth of the missing edge, measure the deepest part of the missing edge along the bisecting direction of the angle between the two sides of the product. If there is a length limit, measure the full length of the missing edge at the same time.

(4) When the missing corners and missing edges are connected, check separately. The missing edges of the missing corners are not calculated as missing edges, that is, the missing corners are inspected according to the missing angle regulations, and the missing edges are inspected according to the missing edge regulations.

(5) Except for special regulations, any missing corners or edges with a depth greater than 3 mm to the standard allowable numerical limit will be included in the calculation. Missing corners and edges with a depth of 3 mm and less than 3 mm are not regarded as missing corners and edges.