Original standard number GB 7992-87 HG/T 3105-1987 Preparation of steel plate glass-lined test pieces HG/T3105-1987 Standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Preparation of specimens of sheet steel
Vitreous and porcelain enamels for sheet steel--Prodaction of specimens for testing This standard specifies the preparation method of specimens for testing the physical and chemical properties of glass. UDC 666.293
#B20,11
GE 7992-
This standard is formulated with reference to the international standard "S02723--1973 "Preparation of Steel Plate Porcelain Specimens". 1
Shape and size of the specimen
The specimen is a commercial plate specimen. According to the requirements of the physical and chemical properties test, the specimen is divided into two types: square specimen and circular specimen. The square specimen is 80mm×80mm, the steel plate thickness is 5.5±0.5mm, and the thickness of the corrugated glass layer on the steel plate is 1.1±0.1mm. The circular specimen is Φ105±2mm, the steel plate thickness is 1~2mm, and the thickness of the corrugated glass layer on the steel plate is 0.±0.1mm. According to the load capacity and accuracy requirements of the analysis day, the mass of the circular specimen shall not exceed 160g in principle. 2
Preparation of the specimen
2.1 Technical Specifications of Test Pieces
The steel plate must have glass properties. The steel plate used to make the square test piece must be the same as the steel plate used in the tooth manufacturing equipment. When preparing the test pieces used to test the physical and chemical properties of the sugar glass glaze, the material, glaze sample, firing process, etc. of the test pieces should be as consistent as possible with the conditions of the sugar glass production equipment.
The back of all test pieces should be sprayed twice to prevent the back from producing iron oxide. For the national shaped test pieces that need to quantitatively determine the weight loss per unit area, a hole with a diameter of about 2.51 Ⅱ㎡ is made 3 Ⅱm away from the edge for the convenience of weighing and firing, so that the test piece can be hung for firing and weighing. In addition to spraying the bottom and the glaze, the back side should be glazed and the edges should be sealed. Porcelain cracking or iron exposure on the back and edges is not allowed. 2.2 Coating of Test Pieces
The coating of the test pieces should be made of regular steel plate coating. Method. The steel plates to be coated with glass glaze may be made by any approved method. However, for comparison purposes, the same batch of test plates shall be made by similar methods and materials. The test pieces shall be coated with base and top glaze according to the requirements of 2.1. The glass layer shall reach the specified thickness and the firing process of the test piece shall be as similar as possible to the firing process of the appropriate equipment. Care shall be taken to minimize the accumulation of existing glaze on the edges of the test piece. After the top glaze is dried, the square test piece may be properly wiped off with a width of 2 μm and then fired. 3
Quality of test piece
The glass surface of the test piece shall be smooth and free of defects. Test pieces that do not meet the specified requirements in visual inspection shall be discarded. Approved by the Ministry of Chemical Industry of the People's Republic of China on July 1, 1987 and implemented on 10-01, 1987bzxz.net
GB 7992-87
Appendix A
Preparation of circular test pieces without perforations on the edges
(Supplement)
A:1 For the three-point supported test pieces at the bottom, used for determining the weight loss per unit area, it is recommended to use steel plates with a diameter of 95±2mm and a thickness of 1-2mm to make the test pieces. The edges do not need to be perforated. The effective test area of ​​this type of test piece is exactly the same as that of the standard test piece with a stacking diameter of 105mm. By removing the invalid area occupied by the perforations on the edges, the true diameter of the test piece is reduced, which is beneficial to the carrying and weighing of the test piece. A.2 For the preparation and quality requirements of the test piece with a diameter of 95mm, refer to the provisions of Chapters 2 and 3 of the main text of the standard. GB7992--87
Appendix B
Reference)
.1 If sampling is taken from the product, the sample can only be sampled from the surface of the product. First, use a grinding wheel to cut the surface of the glass (the base cutting width is determined by the selected cutting tool), cut the sample and add it to the specified size. For the test piece used to quantitatively measure the weight loss per unit area, if its weight exceeds 200g, it is necessary to use an appropriate weighing device, and it will cause a decrease in the test accuracy. B, 2 The preparation of cast iron test pieces can be carried out in accordance with the provisions of this standard. The base of the cast iron test piece can be reversely machined. For the test piece used to measure the weight loss per unit area, its size is selected according to Appendix A, and its thickness can be relaxed by 2.5mm. Additional remarks:
This standard is issued by the National Technical Committee for Standardization of Glass Equipment. This standard was drafted by the Chemical Machinery Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Wu Yuqing and Jin Dequ.
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