What are the welding precautions for A283 grade D carbon steel plate sheet

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At present, the design of oil and gas A283 grade D carbon steel plate sheet pipeline is based on the yield strength of steel, and high transmission work requires higher yield strength of A283 grade D carbon steel plate sheet steel. For welded wire pipe, the yield strength decreases after rolling and decreases with the increase of strength.

Weathering steel plate for welding structure is made by adding metal materials such as chromium, molybdenum, titanium and vanadium to ordinary molten steel. The addition of these materials can form a protective film on the steel surface, which can resist weathering corrosion for a long time. The advantages of weathering steel plate for welding structure: It has very good welding performance and weather resistance, and is widely used in railways, bridges and other areas that need to be exposed to the atmosphere for a long time. Disadvantages of weathering steel plate for welded structure: It has very high requirements on the production process, and the poorer technology can not produce good weathering steel plate, A283 grade D carbon steel plate sheet.

The amount of Vanadium in steel material is generally between 0.04% and 0.12%. The role of Vanadium is to affect the microstructure and properties of steel material. It mainly precipitates in the ferrite at the austenite grain boundary, and can inhibit the recrystallization of austenite and prevent the crystal during rolling. The grains grow, which refines the ferrite grains and improves the strength and toughness of A283 grade D carbon steel plate sheet etc. steel material.

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