Method for smelting 07Cr2MoW2VNbB steel in electric furnace and using same to form round pipe billets through horizontal continuous casting
A technology of horizontal continuous casting and electric furnace smelting, applied in the field of iron and steel metallurgy, can solve the problems of difficult industrial production, large deformation resistance, narrow deformation temperature range, etc., and achieve the effect of improving internal quality, low production cost, and increasing billet rate.
Active Publication Date: 2011-11-02
衡阳华菱连轧管有限公司
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[0003] The purpose of the present invention is to aim at the molten steel ingot casting and arc continuous casting produced by T23 steel in the prior art due to its complex chemical composition, high alloy element content, large deformation resistance, low plasticity, and narrow deformation temperature range during thermal deformation. The difficult problem of billet industrial production discloses a method of using electric furnace smelting molten steel to refine it and then horizontally continuous casting it into a round tube billet
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[0024] Example: Hengyang Valin Continuous Rolling Tube Co., Ltd. adopts the method of electric furnace plus molten iron smelting and horizontal continuous casting to form round tube blanks to produce ∮140mm specification 07Cr2MoW2VNbB steel (see Table 1 for process parameters). The process flow is 30 tons of AC electric furnace Refining (tapping from the bottom of the eccentric furnace, adding refining synthetic slag, various alloys, and deoxidizers)→refining in a 40-ton ladle furnace (bottom blowing argon)→degassing in a 40-ton vacuum furnace→horizontal continuous casting. All the added alloys must be baked, and small holes are pierced on the iron barrels containing ferromolybdenum, ferro-vanadium, and ferro-niobium, and placed in the large fume hood of the refining furnace to be baked by the heat of the flue gas; a part of the micro-carbon ferrochrome 40 minutes before tapping, it is added to the poured steel ladle and baked with residual heat, and the micro-carbon ferrochrom...
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The invention relates to the production methods of smelting in electric furnaces and horizontal continuous casting in the technical field of ferrous metallurgy, in particular to a method for smelting 07Cr2MoW2VNbB steel in an electric furnace and using the same to form round pipe billets through horizontal continuous casting. The method comprises the steps of raw and auxiliary material proportioning, smelting in the electric furnace, ladle refining, vacuum degassing and horizontal continuous casting. At the earlier stage of smelting, the slag with strong oxidability and good mobility is manufactured and rapid dephosphorization is carried out at low temperature. At the later stage of smelting, rapid heating, high boiling, degassing and inclusion removing are carried out to improve the cleanliness of molten steel. Tundish and a crystallizer are in sealed butt joint during horizontal caster production and protecting slag is unnecessary to be added into the crystallizer, thus omitting a link of secondary oxidation and slag inclusion absorption of the molten steel. Water spray and cooling are not needed after the casting billets exit from the crystallizer. Combined electromagnetic stirring of a secondary cooling zone and a solidification end is adopted to improve the quality inside the casting billets. The casting billets do not have bending processes and do not need to be flattened, thus being beneficial to production of the steel containing vanadium and niobium. The method is low in production cost and ensures the billet yield of the steel to be improved by over 5-10% compared with arc continuous casting and die casting.
Description
technical field [0001] The invention relates to a production method of electric furnace smelting and horizontal continuous casting in the technical field of iron and steel metallurgy, in particular to a method for smelting 07Cr2MoW2VNbB steel in an electric furnace and then horizontally continuous casting to form a circular tube billet. Background technique [0002] 07Cr2MoW2VNbB steel is an alloy structural steel grade in GB 5310 high-pressure boiler seamless steel pipe, and its composition refers to ASME / ASTM T23 / P23 steel (referred to as "T23" in the boiler and metallurgical industry). The steel pipe rolled by T23 steel is used as the heating surface of the superheater and reheater of the boiler above 200-300MW. It has good creep performance and allowable stress at 550-600 °C. This material was introduced in Europe in the late 1990s. And the application in Japanese thermal power units. my country introduces T23 steel to conduct research on the localization of 07Cr2MoW2VN...
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IPC IPC(8): C21C5/52C21C7/06C21C7/10B22D11/115B22D11/111
CPCY02P10/20
Inventor 田汉蒲宋景凌龙云鑫刘合萍
Owner 衡阳华菱连轧管有限公司