The metal structure of 15CrMo steel is martensite. This material has good oxidation resistance at about 650℃, good thermal strength below 600 ℃, and good shock absorption and thermal conductivity. ASTM A572 CS steel carbon plate, 15CrMo steel is widely used in steam turbines. However, this type of steel has a greater tendency to harden and has poor welding performance. GB/T 3077-2015 15CrMo plates are supplied with 5 to 70MM thick, can be set to roll futures.
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The visual inspection (VI) or visual detection method is to scan the surface of the steel plate through a machine vision system (CCD line camera), convert the captured target into an image signal, and send it to a dedicated image ASTM A572 CS steel carbon plate processing system, which converts it into a digital signal based on pixel distribution and brightness, color and other information. The system performs various operations on these signals to extract the characteristics of the target, and then controls the operation of the equipment on the spot according to the result of the discrimination. Visual detection method can achieve online high-speed detection for the ASTM A572 CS steel carbon plate steel plate.
With the increase of temperature, the yield limit of ASTM A572 CS steel carbon plate will decrease monotonically, but the tensile strength of ASTM A572 CS steel carbon plate will rise to a high peak value at a certain temperature, and then decrease. This peak temperature is called the blue brittleness temperature of ASTM A572 CS steel carbon plate. Near the blue brittleness temperature, the ASTM A572 CS steel carbon plate strength increases and the plasticity decreases. The elongation and section shrinkage of ASTM A572 CS steel carbon plate increase with the increase of temperature, but there is a low peak at the blue brittleness temperature. The blue brittleness temperature of low carbon steel ranges from 200 ℃ to 250 ℃. The blue brittleness of low alloy steel is not obvious as that of low carbon steel, and the blue brittleness temperature is higher.
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