welding of nm400 steel sheet equivalent material in EN standard

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SA516 70 grade has the highest tensile and yield strength range due to the highest carbon content (up to 0.28%). For high-grade welding of NM400 steel sheet steel plates such as SA516 70 grade, especially thick steel plates need to be preheated during arc welding.

Special boiler steel is derived from carbon structural steel. The chemical composition of boiler steel is basically the same as that of high-quality carbon structural steel of the same level, but the welding of NM400 steel sheet steel mechanical property requirements are more strict, especially for impact toughness. And the aging sensitivity is required to be small. The boiler steel should be deoxidized and the non-metallic inclusions should be removed during smelting. The structure should be uniform. The grain size should be controlled in 3-7 grades. The defects such as interlayer, shrinkage, porosity and porosity should be minimized.

Primary processing, steel plate cutting processing cutting method, it is a flame cutting, because it to the accuracy requirement of the cutting size is not very high, the thickness of the welding of NM400 steel sheet plates in a certain range can be a good cutting quality and cutting effect, and the cut surface can be very smooth, however, it is important to note that in this work, is the need to pay attention to steel plate deformation at high temperature.

It is a modern high-tech professional enterprise integrating scientific research, welding of NM400 steel sheet production and sales. The company is mainly engaged in the manufacture, installation and commissioning of boiler and pressure vessel, chemical, metallurgical, petroleum and other equipment, as well as welding of NM400 steel sheet process technology development, technology transfer and related technical consulting and technical services.

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Both parties shall confirm the welding of NM400 steel sheet material object and the quality of the products, confirm the reasons for the defects and the quality of the products, and sign the quality inspection agreement. Major quality objections shall be reported to relevant leaders in a timely manner, and shall be discussed and solved with the welding of NM400 steel sheet steel plant.