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When buying stainless steel branch pipe table, you can judge its quality from the appearance, size, material, manufacturing process, performance inspection, etc., the specific methods are as follows:
Appearance check
Surface quality: the surface of the high-quality stainless steel stub table should be smooth, without obvious scratches, cracks, trachoma, porosity and other defects. If the surface is rough with a lot of defects, it may affect its corrosion resistance and service life.
Color uniformity: good quality stainless steel branch pipe table color uniformity. If there are different shades of color, it may be uneven heat treatment in the production process or differences in the material, which will affect the performance of the product.
Weld appearance: for the welded pipe table, the weld should be uniform, neat, no weld tumor, biting edge, not welded through and other defects. The surface of the weld should have a smooth transition and be well combined with the base material, otherwise the weld may become a weak link and be prone to leakage and other problems.
Size Measurement
Pipe diameter and wall thickness: Use calipers, micrometers and other measuring tools to measure the pipe diameter and wall thickness of the stub table to see if it meets the product specification requirements. Excessive dimensional deviations may result in installation difficulties or failure to meet the pressure and flow requirements of the piping system.
Length and Angle: Check that the length of the stub table, the angle between the stub and the main pipe and other dimensions are accurate. Especially for branch pipe tables with specific installation requirements, angular deviations may affect the layout and operation of the piping system.
Material Analysis
Spectral detection: The material analysis of the stainless steel branch pipe table is carried out by a spectral analyzer to detect whether the content of the main alloying elements (such as chromium, nickel, molybdenum, etc.) is in accordance with the standard requirements of the corresponding stainless steel material. Insufficient content of alloying elements will reduce the corrosion resistance and strength of stainless steel.
Magnetic test: Generally speaking, 304, 316 and other austenitic stainless steel is non-magnetic or weakly magnetic, while ferritic stainless steel is magnetic. Through the magnetic test can initially determine the type of stainless steel, but this method can only be used as a reference, because after cold working and other treatments, austenitic stainless steel may produce a certain degree of magnetism.
Manufacturing process assessment
Forging quality: the forged stub table should have a dense internal organization without forging defects. You can judge the forging process by observing whether the surface forging texture is clear and uniform. Messy texture or obvious defects may mean that there are problems in the forging process, which will affect the strength and toughness of the product.
Processing accuracy: check the machining accuracy of the branch pipe table, such as the roughness and concentricity of the inner hole and outer surface. High-precision machining can ensure the tightness and sealing of the connection between the stub table and the pipeline, and reduce the risk of leakage.
Heat treatment status: suitable heat treatment can improve the organization and performance of stainless steel. High-quality stub benches should have good overall performance after proper heat treatment. You can indirectly judge whether the heat treatment is proper by methods such as hardness test.
Performance test
Pressure test: the branch pipe table for pressure test, such as water pressure test or air pressure test, check whether there is leakage, deformation and other phenomena under a certain pressure. This is an important method to determine the sealing performance and pressure-bearing capacity of the branch pipe table.
Non-destructive testing: The use of non-destructive testing techniques, such as ultrasonic testing, ray testing, etc., to detect whether there are defects in the internal piping table, such as cracks, pores, inclusions and so on. Non-destructive testing can detect internal hidden quality problems without destroying the product.
In addition, when purchasing, suppliers should be required to provide quality certification documents, such as material reports and inspection reports, and choose suppliers with good reputation and qualifications to ensure product quality.