Tian Jin Rong Da Jian Ce You Xian Gong Si

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Product Details

Metal fracture scanning test

Price 2
Unit
Yield /年
Place of Production 天津
Product Category 工程监理和第三方检验
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Product Description

Metal fracture scanning test, fracture analysis and test, fracture test, metal fracture test, fracture analysis scanning
Tianjin Rong Da Testing Co., Ltd. contact: Wang Jingfu
Cell phone: 13102238283 QQ:3144667033
Telephone: 022-23892103
To examine the macroscopic structure and the defect of the metal by the naked eye (visual) or under a magnifying glass which is not more than 10 times. In the laboratory, inspection methods are commonly used etching times low test, fracture test, tower turning hairline test and sulfur print test.
First to understand the acid corrosion test, which is a good preparation of the sample, after the acid corrosion, to display the test of the macro structure of the sample. According to the different temperature of acid liquid, it can be divided into two kinds of test, hot acid etching and cold acid etching. According to GB/T1979 rating chart to control the organization defect map to carry out the rating. And through a magnifying glass, in the specimen after the acid etching can be found on various subcutaneous and internal defects, such as porosity, segregation, bubble formation, shrinkage, cracks, inclusions, residual white spots, folding and so on.
The next is the fracture test, the specimen is carved slot, while the use of hammer or press to break the specimen, and then with the naked eye or 10 times the magnifying glass to check the situation, said the fracture test. Through the observation of fracture, can understand whether steel internal crack, flake, bubble, slag, residual shrinkage defects such as grain size, by way of identification. Inspection requirements should be selected according to the type of steel, the sample can be quenched, Quenched and tempered, annealed and rolled in a state of broken, to be able to truly understand the display of its defects. Except for some special reasons, the sample is usually selected to break after quenching. Inspection method standard: size is not more than 40mm of steel, for the transverse fracture; size of more than 40mm of steel, for horizontal broken door. The types of fracture are: Stone fracture, ductile fracture, porcelain fracture, layered fracture, naphthalene fracture, brittle fracture, graphite fracture and so on. Ductile fracture (fibrous fracture) is a significant plastic deformation of fracture before the fracture, which is generally considered to be a better fracture surface.
Fracture test
The third is a tower turning hairline test, will be placed into the provisions of the pyramid steel car or stepped specimen, and then use the acid etching or magnetic powder inspection lines, referred to as the tower test. Is a test method used to test the condition of the different depth of the steel. The standard provides the total length of the sample is about 200mm, and the three step sample is made of 50mm with each step length. Test with steel, the smallest diameter shall not be less than 16mm and the maximum shall not be greater than 150mm.
Finally introduce the sulfur print test, this is a use of sulfide containing sulfuric acid and steel in the role of hydrogen sulfide, sulfide precipitation and reaction of silver halide photographic paper on tan after the test of sulfur in steel, and the indirect test method and analysis of the segregation of other elements, called the sulfur print test