High-purity smelting method for low-Si and low-Al blade steel

Abstract

The invention provides a high-purity smelting method for low-Si and low-Al blade steel. The high-purity smelting method comprises the following steps of AOD smelting, VOD smelting and LF refining. The invention further provides a low-Si and low-Al blade steel high-purity smelting vacuum steel ladle feeding mechanism comprising a steel ladle cover, an installation plate is arranged on the inner wall of the steel ladle cover, a driving motor is arranged on the top face of the installation plate, a connecting buckle frame is arranged on the bottom face of the installation plate, a material barrel is inserted into a groove body of the connecting buckle frame, and a material leakage opening is formed in a bottom plate of the material barrel. A plug plate is inserted into the material leakage opening and fixed to the bottom face of a connecting plate, and the connecting plate is fixed to the surface of a lifting ring. The low-Si and low-Al blade steel high-purity smelting vacuum steel ladle feeding mechanism has the beneficial effects that automatic feeding in a steel ladle sealing state is achieved, in other words, after the plug plate is separated from the material leakage opening, an additive falls, and when a shaft sleeve drives a rotating ring to rotate, the additive left on the top face of the connecting plate is swept off through a material stirring plate.

Description

technical field [0001] The invention relates to the technical field of steel smelting, in particular to a high-purity smelting method for low-Si and low-Al blade steel. Background technique [0002] At present, the smelting process of 10Cr11Co3W3NiMoVNbNB, which is extremely difficult to smelt low-carbon, low-silicon, low-aluminum, and high-boron steel, is technically difficult. This steel is mainly used in supercritical and ultra-supercritical steam turbine blade steel, high-strength bolts, and other high-temperature parts. , the use temperature can reach 630 ℃, with high yield strength, high enough durable creep strength, toughness and oxidation resistance. [0003] In the existing technology, the traditional smelting process mainly adopts electric furnace + VOD or electric furnace + AOD smelting. Due to the low content of Si, Al, and C in the steel, the deoxidation and reduction are limited, the oxygen content in the steel is high, the composition uniformity, and the puri...

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Problems solved by technology

[0003] In the existing technology, the traditional smelting process mainly adopts electric furnace + VOD or electric furnace + AOD smelting. Due to the low content of Si, Al, and C in the steel, the deoxidation and reduction are limited, the oxygen content in the steel is high, the composition uniformity, and the purity are poor. It is difficult to meet the requirements of non-metallic inclusions A, B, C, and D in thickness and thickness ≤ 1.5, and the success rate of smelting is extremely low

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