Method for adding refining denaturant in 3Cr2MnMoS die steel
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A technology of die steel and denaturant, applied in the direction of improving process efficiency, can solve the problems of low yield of denaturant, low spheroidization rate of inclusions, unstable denaturation effect, etc., and achieve the effect of improving yield
Inactive Publication Date: 2014-04-09
江油市长祥特殊钢制造有限公司
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Problems solved by technology
Apparently, the prior art 3Cr2MnMoS mold steel refining denaturant addition method has the problems of low yield of denaturant, unstable denaturation effect and low spheroidization rate of inclusions inside the steel matrix.
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Embodiment 1
[0032] Furnace number 13V122, steel type 3Cr2MnMoS, ingot shape 10.6T, count 2;
[0033] Electric arc furnace EF smelting, oxygen blowing and fluxing, oxygen pressure 0.4Mpa; deep oxygen blowing, oxygen pressure 1.0Mpa; sampling, slag removal 90%, steel tapping temperature 1635°C, molten steel composition weight percentage C0.06, Si0.01, Mn0.06, P0.006, S0.1, Cr0.25, Mo0.15;
[0034] Ladle refining LF, adding 300kg of lime, 650kg of high-carbon ferrochrome, 450kg of high-carbon ferromanganese, and 30kg of ferromolybdenum. After smelting for 30 minutes, feed 80m of aluminum wire, add 30kg of silicon-calcium powder, and 30kg of carbon powder. Sampling and composition of molten steel Weight percent C0.31, Si0.15, Mn1.25. P0.013, S0.045, Cr1.65, Mo0.21;
[0035] To make acid slag, add 400kg of firebricks, the slag alkalinity is 1.1 to 1.4, and the composition of the firebricks is SiO with a weight ratio of 60%. 2 and 40% Al 2 o 3 ;
[0036] Add sulfur to the sulfur core wire...
Embodiment 2
[0040] Furnace number 13V140, steel type 3Cr2MnMoS, ingot type 13T, count 2; the manufacturing steps of Example 2 are the same as Example 1, the addition of raw and auxiliary materials, condition control and composition control are also the same as Example 1, the only difference is that The amount of rare earth wire added is slightly different. Because the ingot type 13T of embodiment 2, therefore, the addition amount of rare earth silk is every ingot type 5.5kg.
Embodiment 3
[0042] Furnace number 13V196, steel type 3Cr2MnMoS, ingot type 13T, count 2; Example 3 is actually a repeat test of Example 2, and its production steps, raw and auxiliary materials addition, condition control and composition control are all the same as Example 2 .
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Abstract
The invention provides a method for adding a refining denaturant in 3Cr2MnMoS die steel, which is used for solving such problems of a method for adding a refining denaturant in 3Cr2MnMoS die steel in the prior art that the denaturant yield is low to cause unstable denaturation effect and low nodularization rate of internal impurities of a steel matrix, and the like. 3Cr2MnMoS die steel is produced by an electric arc furnace EF and ladle refining LF. The method is characterized by comprising the following steps: producing acidic slag by fire bricks after LF deoxidating and regulating the other components, increasing sulfur by using a sulfur core wire, treating molten steel through a VD type ladle refining furnace after removing 80wt% of slag, adding the denaturant in a casting process for spheroidizing sulfides in the molten steel. The method for adding refining denaturant in 3Cr2MnMoS die steel provided by the invention has the beneficial effects of being capable of greatly improving the denaturant yield and ensuring the nodularization of the majority of sulfide impurities, and the qualified rate of flaw detection of the produced die steel is larger than 95%.
Description
technical field [0001] The invention relates to a high-grade mold steel refining technology, in particular to a method for adding a denaturant for 3Cr2MnMoS mold steel refining. Background technique [0002] 3Cr2MnMoS mold steel is a German standard mold steel (usually also known as German Buderus 3Cr2MnMoS mold steel). Because of its relatively suitable hardness, strength and surface finish, it is often used for large plastic molds and mold bases that require high surface finish. On, such as: car bumper, TV shell mold and so on. [0003] Usually, 3Cr2MnMoS die steel is produced by the process of electric arc furnace EF+ ladle refining LF or VD ladle refining furnace, and oxidation method is used to remove impurities during EF smelting; deoxidation and other components are adjusted during LF or VD ladle refining. According to the standard, the sulfur content of 3Cr2MnMoS die steel is 0.05 to 0.10 (weight percent), and the content of sulfide inclusions inside the steel matri...
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