ASME SA537 pressure vessel uses heat-treated carbon-manganese-silicon steel plate.The steel plates supplied by this standard are divided into three categories, namely SA537Gr1, SA537Gr2, and SA537Gr3. The maximum thickness of steel plates corresponding to these three grades is limited to: SA537Gr1 is not more than 100mm;The thickness of SA537Gr2 does not exceed 150mm;The thickness of SA537Gr3 does not exceed 150mm.
After adding trace elements such as phosphorus, copper, chromium, and nickel to Q355NH steel, a dense and highly adherent protective film is formed on the surface of the weathering steel, which prevents rust from spreading and developing, and protects the substrate under the rust layer to slow its corrosion . An amorphous spinel oxide layer of about 50 μm to 100 μm thick formed between the rust layer and the substrate is dense and has good adhesion to the base metal, which greatly improves the atmospheric corrosion resistance of the steel material, sa572 grade 55 asme alloy steel.
Ultrasonic flaw detection emits ultrasonic waves to the sa572 grade 55 asme alloy steel steel plate under inspection. If there are defects in the steel plate, the ultrasonic waves will reflect, refract or deform waveforms due to the defects. By recording these changes, the type and shape of the defects are analyzed. Due to its high energy and good penetration performance, and the smoothness of the sa572 grade 55 asme alloy steel steel plate itself, ultrasound is often used to detect defects such as inclusions, shrinkage holes, bubbles, and cracks in the steel plate.
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