For 20# steel tubes with wall thicknesses up to 87mm, internal integrity is extremely critical, as even the smallest cracks and impurities can seriously compromise their structural integrity and performance, and ultrasonic testing can effectively identify these potential defects.
Ultrasonic testing, also referred to as UT, is a non-destructive testing technique that utilizes the properties of reflection, refraction, and attenuation of ultrasonic waves as they propagate through a material to detect defects within the material.
When the ultrasonic wave encounters defects within the material such as cracks, inclusions or holes, reflected waves will be generated, and the location, shape and size of the defects can be determined by receiving these reflected waves.
Through careful inspection, it ensures that the overall steel pipe is free of defects and fully complies with the standards and customers' requirements.
Botop is a professional and reliable Welded Steel Pipe manufacturer and Seamless Steel Pipe stockist in China, offering you steel pipe products with reliable quality and competitive price. We promise to support the third party inspection organization for all the goods we sell, and we will arrange the inspectors to inspect the steel pipes again when each batch of steel pipes is delivered to ensure the quality of the steel pipes again.
GB/T 8162 is a standard specification issued by China for seamless steel pipes for structural purposes. 20# is a common carbon steel grade with good mechanical and processing properties, widely used in building structures and mechanical structures.
GB/T 8162 Grade 20 chemical composition and mechanical property requirements are as follows:
GB/T 8162 Grade 20 Chemical Composition:
| Steel grade | Chemical composition, in % by mass | |||||||
| C | Si | Mn | P | S | Cr | Ni | Cu | |
| 20 | 0.17 - 0.23 | 0.17 - 0.37 | 0.35 - 0.65 | 0.035 max | 0.035 max | 0.25 max | 0.30 max | 0.25 max |
GB/T 8162 Grade 20 Mechanical Properties:
| Steel grade | Tensile Strength Rm MPa |
Yielding Strength ReL MPa |
Elongation A % |
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| Nominal Diameter S | |||||
| ≤16 mm | ＞16 mm ≤30 mm | ＞30 mm | |||
| 20 | ≥410 | 245 | 235 | 225 | 20 |
Post time: Oct-15-2024