Forging molten steel used for producing spindle and hinged shaft of hydropower station generator and smelting process for forging molten steel

Abstract

The invention discloses forging molten steel used for producing a spindle and a hinged shaft of a hydropower station generator and a smelting process for forging molten steel. The forging molten steel used for producing a spindle and a hinged shaft of a hydropower station generator is prepared from the following chemical components in weight percentage: 0.42-0.46wt% of C, 0.20-0.30wt% of Si, 0.55-0.75wt% of Mn, less than or equal to 0.005wt% of S, less than or equal to 0.015wt% of P, less than or equal to 0.0010wt% of O, less than or equal to 0.0001wt% of H, less than or equal to 0.0045% of N, and the balance of Fe and unavoidable impurities. A preparation method comprises the processing steps of KR-method hot metal pretreatment and deep-desulfuration, converter smelting, LF ladle furnace refining, VD furnace vacuum refining and the like. Molten steel produced according to the invention is high in cleanness, the contents of nonmetallic inclusion and gas of the forging steel produced by adopting the method are relatively low, namely, oxygen content in steel is 0.0005-0.0010wt%, the content of hydrogen in steel is 0.00003-0.0001wt%, and the nonmetallic inclusion is in 0-0.5 grade. The forging molten steel has excellent toughness, low-temperature impact toughness, anti-fatigue performance and fracture toughness, thus meeting the safe, long-life and efficient operation of generators.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a forging molten steel used for manufacturing a rotating shaft and a hinge shaft of a hydropower station generator and a smelting method thereof. Background technique [0002] Steel forgings are mainly used for the production of shaft parts, connecting rods, rotors, impellers, pipeline valve covers, valve bodies and other key basic components of construction machinery and equipment in the fields of hydraulic, electric power, metallurgy, petrochemical, railway, mining, shipbuilding and other fields. An important indicator to measure the production level of the equipment manufacturing industry. The production of high-quality forged steel products is the top priority to ensure the safe operation of construction machinery and equipment. Reducing the content of forged steel gas and inclusions and improving the cleanliness of steel is the key to improving forging steel. I...

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Problems solved by technology

[0004] At present, there are domestic research reports on the mechanical properties of forging steel for generator shafts. The oxygen content in the steel is mostly 0.0015wt%~0.0035wt%, the hydrogen content is 0.0002wt%~0.00035wt%, and the non-metallic inclusions are mostly 0.5~ Grade 1.5, the steel has good strength, toughness and fatigue resistance, which can satisfy the safe and efficient operation of the generator, but the service life is limited to a certain extent

At present, there are no patents or research reports on the molten steel smelting method of high-cleanness forging steel for manufacturing hydropower generator shafts and hinge shafts in China.

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