Smelting method of high-carbon chromium bearing steel
A technology of high-carbon chromium bearing steel and smelting method, which is applied in the field of smelting high-carbon chromium bearing steel, and can solve problems such as ineffective effects
Inactive Publication Date: 2013-07-31
BAOSTEEL SPECIAL STEEL CO LTD
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Problems solved by technology
However, this method has no obvious effect on solving the distribution and aggregation of B-type non-metallic inclusions in steel.
Method used
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Embodiment 1
[0053] 1. EAF process requirements:
[0054] 1.1. Requirements for loading: pay attention to chemical clearing S≤0.030% when mixing ingredients;
[0055] 1.2. Electric furnace tapping requirements: endpoint C≥0.05%, P≤0.012%, Ti≤0.0006%, T≥1640℃, O≤1000ppm;
[0056] 1.3. During the tapping process, add in the ladle with the steel flow: deoxidizer Al ingot 2.0-3.0kg / t, lime 200-300kg / furnace, appropriate amount of carbon powder; low-Ti alloy, electrolytic manganese, high-purity ferrosilicon, low-titanium high chromium;
[0057] 1.4. It is strictly forbidden for oxidation slag to flow into the ladle;
[0058] 2. Process requirements of LF furnace
[0059] 2.1. The deoxidation work of LF furnace is done well, white slag is produced, and high-purity ferrosilicon powder, bagged lime, and 98 carbon powder are used for slag formation and deoxidation. It is strictly forbidden to use ferrosilicon powder, and the LF furnace is closed to remove dust; use low Ti alloy, electrolytic man...
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Abstract
The invention relates to a smelting method of high-carbon chromium bearing steel, which is used for solving the phenomena of distribution and congregation of B non-metal inclusions in steel by controlling slag system and inclusions through controlling the Ti content in the refining process, carrying out slag exchange during refining mildly stirring and adding carbonized rice hull. The smelting method comprises the specific steps of: in EAF (electric arc furnace) process, controlling [S] in molten supernatant being less than or equal to 0.030% during burdening; in EAF tapping process, inhibiting the oxidizing slag flowing into a steel ladle and using low-Ti-content alloy; in LF (ladle furnace) process, carrying out online slag sample analysis (carrying out first LF analysis before hoistingthe ladle), and controlling the alkalinity of the low-alkalinity slag to be 2.0-3.0 with buhrstone according to the slag sample analysis before pouring the slag out of LF furnace; after VD (vacuum degassing) furnace vacuum treatment, carrying out online slag sample analysis to control hydrogen being less than or equal to 1.5ppm and no larger than 2.0ppm; after VD furnace vacuum treatment, closingthe cover and stirring mildly for 15-20 minutes; and in die casting process, using FZ-2 covering slag and adding an inlet heating agent after casting. According to the invention, by bluing fracture test measurement, the content of low-multiple inclusions is less than or equal to 2.5mm / dm<2>, the maximum length of single inclusion is less than or equal to 3mm; and the coarse system rating in B inclusions is less than or equal to 1.0.
Description
technical field [0001] The present invention relates to the smelting technology of alloy structural steel in the metallurgical industry, in particular, the present invention relates to a method for smelting high-carbon chromium bearing steel. - [Mn] 0.60% - 080% - [Si] 0.20% - 0.40% - [Cr] 1.65% - 1.95% - [Mo] 0.40% - 0.50% bearing steel. It belongs to the technical field of ferrous metal material manufacturing and processing. Background technique [0002] About high carbon chromium bearing steel: [C]0.90%~1.05%-[Mn]0.60%~080%-[Si]0.20%~0.40%-[Cr]1.65%~1.95%-[Mo]0.40%~0.50 % Bearing steel is a commonly used and typical high-carbon chromium bearing steel. Mainly used for wind power bearing steel shaft sleeve material steel. The shape and size of the non-metallic inclusions and the content of residual elements of the steel grade are the key indicators of the purity, which are higher than those of similar bearing steels, and the composition is different from other steel grad...
Claims
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IPC IPC(8): C22C38/22C22C33/04C21C7/00
Inventor 江成斌顾家强徐传兵刘军占刘明华罗辉
Owner BAOSTEEL SPECIAL STEEL CO LTD