At present, most stainless steel flange manufacturers in the development process, have paid special attention to the technical development of products, often ignoring the design of products. The price of stainless steel flange consumer aesthetic level continues to rise, for product quality is the most important thing, for the surface uneven detection methods should have what, let’s see
Detection method for pits in stainless steel flat welded flange
When there are pits on the surface of the flange, there are two commonly used detection methods: one is the magnetic leakage method to detect the flange, and the other is the ultrasonic method to detect the flange. Let’s explain ultrasound first.
The propagation process of mechanical vibration in the medium is called wave. The human ear senses elastic waves with frequencies above 20 Hertz and below 20,000 Hertz.
Elastic waves with frequencies below 20 Hertz are called infrasound, while elastic waves with frequencies above 20,000 Hertz are called ultrasonic waves. The human ear can sense neither infrasound nor ultrasound. Ultrasonic detection method uses the principle of ultrasonic pulse reflection to detect the thickness of the corroded pipe wall.
During detection, the probe transmits ultrasonic pulses vertically to the inner wall of the large diameter flange. The probe first receives the reflected pulse from the inner surface of the tube wall, and then receives the reflected pulse from the outer surface of the tube wall. The distance between the reflected pulse and the inner surface reflects the thickness of the tube wall.
Ultrasonic detection of stainless steel flat welded flange has the advantages of large thickness, high sensitivity, fast speed, low cost, harmless to human body, etc. It can be used for defect location and quantification.
Ultrasonic inspection shows that the defects are not intuitive, the detection technology is difficult, it is easy to be affected by subjective and objective factors, and the test results are not easy to save, and the ultrasonic inspection working surface is smooth, requiring inspectors to have rich experience to identify the thickness. Defect type, suitable for the detection of large parts, ultrasonic detection also has its limitations.
The second kind of magnetic flux leakage detection method is based on the basic principle of high permeability ferromagnetic materials. The permeability of corrosion defects of stainless steel flat welded flange is far less than that of the flange, and the flange is magnetized under the additional magnetic field. When the flange has no defects, the magnetic field line passes through the steel pipe, and the magnetic field line is evenly distributed
When there is a defect in the flange, the magnetic force line will bend, and part of the magnetic force line will leak out from the surface of the steel pipe. By detecting the magnetic leakage on the surface of the magnetized large diameter flange, the presence of defects can be determined.
Flange prices are affected
The price of stainless steel flanges is affected by many factors, from material cost, production process to market supply and demand. Stainless steel flange market demand, supply capacity and international crude oil prices, exchange rate fluctuations and other factors will have an impact on the price.
With the intensification of market competition and technological progress, the price of stainless steel flanges may fluctuate. In the future, with the development of the industry and the improvement of technology, the price trend of stainless steel flanges will still be affected by market demand and supply capacity.
