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A kind of electroslag remelting slag capable of retaining sulfur and a method for electroslag remelting
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A technology of electroslag remelting and electric current, applied in the field of electroslag remelting, can solve the problem of high desulfurization rate, achieve the effect of reducing slag basicity, strong versatility and applicability, and avoid excessive desulfurization rate
Active Publication Date: 2021-01-05
HARBIN WELL WELDING CO LTD +1
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[0004] In order to solve the problem of high desulfurization rate of the existing electroslag remelting method, the present invention proposes an electroslag remelting method capable of retaining sulfur
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Embodiment 1
[0027] Example 1: Combining figure 1 Illustrate present embodiment, present embodiment electroslag remelting slag is by the Al of 5 parts by the CaO of 5 parts, 30 parts by weight 2 o 3 , 65 parts of CaF 2 and 3 parts of SiO 2 Prepared.
[0028] Utilize above-mentioned electroslag remelting slag to complete a kind of electroslag remelting method that can keep sulfur, carry out according to the following steps:
[0029] Step 1. Raw material selection:
[0030] Parts by weight: CaO: 5 parts, Al 2 o 3 : 30 parts, CaF 2 : 65 parts and SiO 2 : 3 parts weigh metallurgical lime block, white corundum powder, fluorite powder and quartz powder as raw materials; wherein metallurgical lime block provides CaO, white corundum powder provides Al 2 o 3 , fluorite powder provides CaF 2 , quartz powder provides SiO 2 ;
[0031] Step two, raw material drying:
[0032] Place the raw material weighed in step 1 in a furnace at 900°C for 3 hours;
[0033] Step three, slag making:
[...
Embodiment 2
[0044] The difference between this embodiment and embodiment 1 is that the consumable electrode in this embodiment is 309L austenitic stainless steel with a sulfur content of 0.01-0.015%; Table 2 is the composition comparison of 309L before and after remelting in Example 2.
[0045] As can be seen from Table 1 and Table 2, the rate of recovery of sulfur is relatively stable, being respectively 65.4% and 66.7%, and other elements change little; the deoxidation effect is good, and the deoxidation rate is respectively 47.6% and 57.6%, illustrating that the method of this embodiment has relatively Good inclusion removal effect.
[0046] Table 1
[0047] C Si mn S P Cr Ni Mo O Before remelting 0.010 0.47 1.74 0.013 0.007 19.90 10.51 0.02 0.021 After remelting 0.009 0.38 1.64 0.0085 0.007 19.86 10.50 0.02 0.011 Recovery rate 65.4％ 52.4％
[0048] Table 2
[0049] C Si mn S P Cr Ni Mo ...
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Abstract
The invention discloses electroslag remelting slag capable of preserving sulfur and a method for electroslag remelting and relates to electroslag remelting slag and a method for electroslag remelting.The problem that an existing method for electroslag remelting is high in sulfur removing rate is solved. The electroslag remelting slag is prepared from, by weight, 5-9 parts of CaO, 26-35 parts of Al2O3, 50-65 parts of CaF2 and 1-3 parts of SiO2. The method includes the steps that metallurgical lime blocks, white corundum powder, fluorite powder and quartz powder are weighed and taken as raw materials and dried; firstly, after the fluorite powder is added into a crystallizer, arc starting is carried out; then the white corundum powder and the quartz powder are added in; finally the metallurgical lime blocks are added in; a consumable electrode is welded onto a false electrode; and power-on operation is performed to conduct electroslag remelting. After electroslag remelting is finished, feeding is performed in the manner that current is reduced step by step; and after feeding is finished and power-off operation is performed, cooling and demolding are performed. The technological process of the electroslag remelting slag capable of preserving sulfur and the method for electroslag remelting is more stable and favorable for sulfur preserving, it is avoided that the sulfur removing rate is too high, a prepared and obtained cast ingot is good in forming effect, and the surface is bright and clean. The method is used for electroslag remelting.
Description
technical field [0001] The invention relates to an electroslag remelting method capable of retaining sulfur Background technique [0002] Electroslag steel is widely used in atomic energy, nuclear energy, aerospace, military industry, shipbuilding, etc. , electronics, petrochemicals, heavy machinery, automobiles, trains and many other fields. Electroslag remelting technology is a refining method to obtain high-quality steel ingots. Electroslag remelting is slag washing under high temperature conditions, which can remove inclusions and purify steel ingots. The heavy slag used in electroslag remelting can be used as a consumable electrode The heat source can also control the chemical composition of the metal, refine the molten steel, and remove non-metallic inclusions. The composition is CaF 2 70%+Al 2 o 3 30% heavy slag (AHΦ-6 slag) is widely used at home and abroad. [0003] The general electroslag remelting method has a large desulfurization rate, and the sulfur conte...
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