Cause analysis of cracks in 09cupcrni-a steel sheet

At present, the cutting thickness limit of laser cutting is 20 mm. However, it should be noted that oxygen will be added into the laser beam to cut 20 mm thick 09cupcrni-a steel sheet steel plate, which will form a thin oxide film on the cutting surface, which may affect the cutting quality, Therefore, attention should be paid to this point to avoid problems.

Q355GNH weathering steel is a kind of atmospheric corrosion resistant steel, which has better corrosion resistance than 09cupcrni-a steel sheet, ordinary carbon steel by adding less alloy elements. Q355GNH weathering steel has been widely used in container, railway vehicle, bridge, building and air preheater which need to be resistant to atmospheric corrosion. Q355GNH weathering steel is characterized by the addition of less Cu, P, Cr, Ni and other alloy elements in the steel, so that a dense amorphous spinel type oxide layer with a thickness of about 50-100μm is formed between the rust layer and the base metal, which can prevent oxygen and water from penetrating into the steel matrix, slow down the development of corrosion to steel materials, and improve the atmospheric corrosion resistance.

Brazil's crude steel output was 32.2 million tons, down 9.0% year on year. Turkey's crude steel output was 33.7 million tons, down 9.6% year on year. 09cupcrni-a steel sheet, Crude steel production in Africa was 17 million tons, down 2.3% year on year. Oceania's crude steel production was 6.1 million tons, down 2.9% year on year.