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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, SPA-H corten steel.
Quenching is a common heat treatment process. It is the metal heat treatment process in which the SPA-H corten steel metal workpiece is heated to a proper temperature and kept for a period of time, then immersed in the quenching medium for rapid cooling. Quenching can improve the strength and hardness of steel in a large range, and adjust the coordination between SPA-H corten steel strength and hardness, plasticity and toughness. Quenching is generally used as the final heat treatment.
Steel SPA-H corten steel exports fell sharply year on year. According to the data of the General Administration of customs, 7.811 million tons of steel were exported from January to February, a year-on-year decrease of 27.0%; 2.041 million tons of imported steel, a year-on-year increase of 2.1%. Steel prices continue to fall. According to the monitoring of China Iron and Steel Industry Association, China's steel SPA-H corten steel composite price index at the end of January was 105.48 points, down 0.58% month on month; at the end of February, the index continued to decline to 100.39 points, down 4.83% month on month.
Our company will accept the product quality objection registration record, pass it to the SPA-H corten steel production unit and relevant departments, and timely coordinate the supervision of product SPA-H corten steel quality objection. Our company coordinates the relevant department personnel to the customer unit to carry on the investigation, the processing.