GB/T3077 12Cr1MoV Alloy Structure Steel Bars

GB/T3077 12Cr1MoV Alloy Structure Steel Bars

12Cr1MoV round bar is a standard steel grade for the implementation of China's national standards. It is an alloy structural steel and a heat-resistant steel. This steel still has high thermal strength and oxidation resistance at 580°C, and has high lasting plasticity. The production process is relatively simple and the welding performance is good, but it is sensitive to the normalizing cooling rate. Long-term use at 580°C will produce the second type of temper brittleness caused by the segregation of impurity elements such as phosphorus at the grain boundaries. Long-term use will also cause pearlite spheroidization.

Compared with 12CrMoV steel, this steel has higher oxidation resistance and thermal strength. The creep limit of this steel is very close to the enduring strength value, and it has high plasticity under enduring tensile conditions. The steel has good processability and weldability, but it needs to be preheated to 300°C before welding and stress relieved after welding.

It is a steel material widely used in superheaters, headers, and main steam pipes of high-pressure, ultra-high-pressure, and subcritical power station boilers. It still has high thermal strength, oxidation resistance and long-lasting plasticity at 580°C. The production process is simple and the welding performance is good, but it is sensitive to the normalizing cooling rate. If used for a long time at 580°C, the second type of temper brittleness will occur due to the segregation of impurities such as phosphorus at the grain boundaries. Pearlite spheroidization will also occur with long-term use.

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