Manufacturing method for high-performance 12Cr2Mo1 forgings

Abstract

The invention relates to the technical field of metallurgic manufacturing, in particular to a manufacturing method for high-performance 12Cr2Mo1 forgings. The method comprises the following steps: (1)smelting by an electric furnace: molten steel is obtained through charging, slagging, slag discharge, stirring in a molten pool, dephosphorization and desulfurization; (2) furnace external refining:the molten steel obtained in the step (1) is refined, and chemical components thereof are adjusted; (3) vacuum degassing: steel ingots are obtained through vacuumizing and casting; (4) casting: the heating insulation temperature is 1000-1250 DEG C; and the heating time is determined according to 1.5 times of the JB / T6052 standard; and (5) heat treatment: forged forgings are quenched and tempered in sequence; and once annealing or normalization is performed before quenching. The method improves the low-temperature impact power of the 12Cr2Mo1 forgings, reduces the tempering brittleness tendency, improves the performance stability of the forgings, and has the advantages of simple process, excellent comprehensive performances and stability.

Description

technical field [0001] The invention relates to the technical field of metallurgical manufacturing, in particular to a method for manufacturing a high-performance 12Cr2Mo1 forging. Background technique [0002] 12Cr2Mo1 steel, with chromium and molybdenum as the main alloying elements, has high strength, plasticity and toughness, and is widely used in petroleum, chemical, electric power, shipbuilding and other industries. Chromium and molybdenum elements can increase the strength of the solid solution matrix, increase the stability of the solid solution structure, and play a good role in solid solution strengthening. Molybdenum is a strong carbide-forming element, which can improve the high-temperature strength of steel; chromium can improve the oxidation resistance and corrosion resistance of steel, and the comprehensive mechanical properties of steel can be significantly improved when the two are strengthened together. [0003] 12Cr2Mo1 steel is a steel for hydrogen-facin...

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Problems solved by technology

[0006] Peng Huan disclosed in "12Cr2Mo1R Steel Microstructure and Simulated Processing Performance Research [D]." The heat treatment process of 12mm thick 12Cr2Mo1R steel plate is normalizing temperature 930 ℃, holding time 30min, tempering temperature 730 ℃, holding time 50min, 12Cr2Mo1R steel has good resistance to temper embrittlement, but the low-temperature impact toughness of the material has not been studied, and it is impossible to say whether the obtained 12Cr2Mo1R steel can be used in a hydrogen environment

[0007] Jiang Shanyu and others disclosed in "Development and Research of 12Cr2Mo1R Steel Plates for Boiler Pressure Vessels of Jinan Steel [J]. Wide and Heavy Plates, 2013, 19(3): 14-16." The content of Mo element is controlled at 0.95-1.05%. The normalizing temperature is 930-960°C, the tempering temperature is 720-750°C, and the heating time is 2.0-3.0min / mm. The product has excellent processing performance and high temperature resistance, excellent plasticity and toughness, and stable product quality. However, it needs to be processed under high temperature and high pressure. Low volume rolling, complex process, no energy saving

[0008] Wu Wei disclosed that S≤0.008%, P≤0.008%, As≤0.012%, and C 0.13% in "Countermeasures and Methods to Improve the Properties of 12Cr2Mo1 Steel [J]. Gansu Science and Technology, 2015(7): 57-59." -0.15%, Al 0.15%-0.35%, Mn0.40-0.6, twice normalizing at 940°C + tempering at 680°C, the obtained product has uniform structure and stable mechanical properties, but it needs to be normalized and tempered twice, The process is complex and there is still room for further improvement

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