Smelting process of ultra-low carbon stainless steel material

Abstract

The invention discloses a smelting process of an ultra-low carbon stainless steel material, which includes EAF furnace smelting, LF furnace smelting, VOD furnace smelting, LF furnace final component adjustment; LF furnace smelting step includes steps of adding high carbon ferro-chrome, low-carbon ferrochromium, a nickel plate, and ferro-molybdenum in steel fluid, introducing an alloy elements andincreasing the carbon content; the VOD furnace smelting adopts the vacuum oxygen blasting and decarbonizing; the LF furnace final component adjustment includes the step of adjusting the final component of the steel fluid. Through introducing the high carbon alloy to increase the carbon content, the oxygen blowing and decarbonizing in the VOD furnace can fully release, the steel fluid temperature is improved, the Cr oxidization is reduced; the reduction time is shortened, the steel fluid cooling time is shortened, the time and opportunity of the electricity delivery and temperature rise are reduced; thus the steel fluid carbon increasing caused by the graphite electrode electricity delivery and temperature rise is reduced, and the carbon content is reduced.

Description

technical field

[0001] The invention relates to the technical field of molten steel smelting, in particular to a method for smelting ultra-low carbon stainless steel materials. Background technique

[0002] At present, for stainless steel materials, taking ZG06Cr13Ni4Mo as an example, the standard requires C≤0.06%, but with the research and application of this kind of material, it is found that its corrosion resistance cannot meet the requirements of specific environments. The root cause is the influence of carbides in it. For the corrosion resistance of this kind of material, in order to obtain better corrosion resistance, the carbon content needs to be reduced to below 0.03%, so as to improve the corrosion resistance. In the past, the carbon content of stainless steel materials smelted by electric arc furnaces was generally controlled within the range of 0.025 to 0.05%, which could not be stably controlled below 0.03%. Solved technical problems. Contents of the inventio...