What are the defects in the production of SA514 grade P steel material

When 321 stainless steel contains about 18% Cr, 8% to 25% Ni, and about 0.1% C, it has a stable austenite structure. Austenitic chromium-nickel stainless steel includes the famous 18Cr-8Ni steel and high Cr-Ni series steel developed by adding Cr and Ni content and adding Mo, Cu, Si, Nb, Ti and other elements on this basis. Because 321 stainless steel has comprehensive and good comprehensive properties, it has been widely used in all walks of life.

The martensite microscopic strength of the wear-resistant layer of the SA514 grade P steel material, wear-resistant steel plate can exceed HVl700-2000, and the surface strength can exceed HRC58-62. The key to the wear-resistant layer of the wear-resistant steel plate is dominated by cobalt alloy, and other alloy components such as manganese, molybdenum, niobium, and nickel are added. The martensite in the alloy composition is filled with fibers, and the orientation of chemical fibers is vertical to the surface.

S355J2 steel plate rolling process is controlled rolling process. In the rolling process, the ingot rolling temperature is 1000-1050℃; in the first stage, the low-speed and large reduction rolling process is adopted, the high-temperature stage is 950-1000℃, the SA514 grade P steel material rolling speed is 1.6-2.0m/s, the single reduction rate is 15-20%, and the cumulative reduction rate is 40-45%, so as to ensure sufficient deformation of ingot. In the first stage, the start rolling temperature is 910-930℃, and the finish rolling temperature is ≤ 870℃.As a basic building material, steel plates are currently widely used in automobiles, shipbuilding, chemical industry, aerospace and other fields. Reasonable selection of flaw detection methods to ensure the quality of SA514 grade P steel material steel plates is of great significance to safe production. Common defects of steel plates are folding, inclusion, shrinkage, air bubbles, delamination and cracks. These problems can be discovered in time through flaw detection.

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