The invention provides a production method of low-carbon high-
chromium steel. The method comprises the following steps: the converter tapping carbon content is controlled to 0.15-0.25wt% and the tapping temperature is controlled to 1660-1670 DEG C, and balanced steel is tapped; 1.2-3kg of small active
lime particles are added in each
ton of steel after tapping; the Ruhrstahl & Hereaeus (RH) furnace adopts high lance height
hand pressure control, the lance height and the
oxygen flow are adjusted dynamically at any time according to the carbon content of steel, the
waste gas flow is controlled to no more than 3000Nm<3> / h, the stepped pressure-reducing way is adopted, and the
molten steel liquid level of the
vacuum chamber is always controlled to be below the boundary of the bottom groove and the middle groove; when the RH furnace performs
light treatment to reduce the carbon content of steel to 0.10wt%, the pressure is adjusted, the
oxygen lance adopts a low lance height and the lance height is lowered to the optimum
decarburization location; and
fluorite and aluminum
powder are added in the
low frequency (LF) furnace to reduce
chromium in
slag. By adopting the production method of low-carbon high-
chromium steel, the carbon content can be reduced to below 0.01% and the chromium content is no less than 5%, thus the RH furnace can be used to produce pure and qualified low-carbon high-chromium steel.