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Molybdenum-containing stainless steel and smelting method thereof

A smelting method and stainless steel technology, which is applied in the field of molybdenum-containing stainless steel and its smelting, can solve the problems of complex operation, high volatilization rate of molybdenum oxide balls, large amount of slag, etc., and achieve the effect of simple operation, low production cost and high melting point

Active Publication Date: 2013-12-25
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, some results have been achieved, but in the process of use, there are the following problems: (1) Molybdenum oxide balls start to volatilize at 795°C, and they are directly added in continuous production, and the volatilization rate of molybdenum oxide balls is high; (2) Adding molybdenum oxide balls to the bottom of the electric furnace or the ladle is a complicated operation; (3) When used in the electric furnace or added during the AOD reduction period, the amount of slag is large, and it is difficult for the molybdenum oxide balls to directly enter the molten steel

Method used

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  • Molybdenum-containing stainless steel and smelting method thereof
  • Molybdenum-containing stainless steel and smelting method thereof
  • Molybdenum-containing stainless steel and smelting method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043]The 00Cr17Ni12Mo2 (316L) austenitic molybdenum-containing stainless steel produced by Jiuquan Iron and Steel Group, according to the mass percentage, has the following chemical composition: C: 0.020%, Si: 0.487%, Mn: 1.45%, P: 0.026%, S: 0.001%, Cr: 16.55%, Ni: 10.1%, N: 0.025%, Mo: 2.09%, and others are Fe and residual elements.

[0044] The method for smelting molybdenum-containing stainless steel comprises the following steps:

[0045] Step 1: AOD refining

[0046] 1. Blending into molten iron: at 1543°C, the chemical composition in terms of mass percentage is: C: 1.402%, Si: 0.50%, Mn: 0.30%, P: 0.0272%, S: 0.0605%, Cr: 7.847% , Ni: 10.94%, Mo: 0.273%, and 93.5 tons of molten iron consisting of Fe and residual elements are injected into the AOD furnace.

[0047] 2. Decarburization: In the decarburization process, molybdenum oxide balls and lime are added to the AOD furnace to carry out the decarburization reaction.

[0048] The chemical composition ranges of the m...

Embodiment 2

[0078] The 00Cr17Ni12Mo2 (316L) austenitic molybdenum-containing stainless steel produced by Jiuquan Iron and Steel Group, according to the mass percentage, has the following chemical composition: C: 0.0165%, Si: 0.50%, Mn: 1.40%, P: 0.030%, S: 0.0012%, Cr: 16.70%, Ni: 10.05%, N: 0.020%, Mo: 2.10%, and others are Fe and residual elements.

[0079] The method for smelting molybdenum-containing stainless steel comprises the following steps:

[0080] Step 1: AOD refining

[0081] 1. Add molten iron: at 1600°C, the chemical composition in terms of mass percentage is, C: 1.70%, Si: 0.30%, Mn: 0.20%, P: 0.030%, S: 0.050%, Cr: 10.2 %, Ni: 10.0%, Mo: 0.25%, other 96.5 tons of molten iron containing Fe and residual elements are injected into the AOD furnace.

[0082] 2. Decarburization: In the decarburization process, molybdenum oxide balls and lime are added to the AOD furnace for decarburization reaction.

[0083] The chemical composition ranges of the molybdenum oxide balls in te...

Embodiment 3

[0113] The 00Cr17Ni12Mo2 (316L) austenitic molybdenum-containing stainless steel produced by Jiuquan Iron and Steel Group Co., Ltd. has a chemical composition of C: 0.023%, Si: 0.42%, Mn: 1.35%, P: 0.024%, S: 0.002%, Cr: 16.65%, Ni: 10.15%, N: 0.023%, Mo: 2.15%, and others are Fe and residual elements.

[0114] The method for smelting molybdenum-containing stainless steel comprises the following steps:

[0115] Step 1: AOD refining

[0116] 1. Add molten iron: at 1530°C, the chemical composition in terms of mass percentage is: C: 1.0%, Si: 0.46%, Mn: 0.24%, P: 0.0218%, S: 0.20%, Cr: 6.0% , Ni: 11.5%, Mo: 0.30%, and 85.0 tons of molten iron containing Fe and residual elements are injected into the AOD furnace.

[0117] 2. Decarburization: In the decarburization process, molybdenum oxide balls and lime are added to the AOD furnace for decarburization reaction.

[0118] The chemical composition range of the molybdenum oxide ball in terms of mass percentage is: Mo: 52.68-54.3%,...

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Abstract

The invention discloses a molybdenum-containing stainless steel and a smelting method thereof. The molybdenum-containing stainless steel comprises, by mass, 0.023% or less of C, 0.42-0.50% of Si, 1.35-1.45% of Mn, 0.030% or less of P, 0.002% or less of S, 16.55-16.70% of Cr, 10.05-10.15% of Ni, 0.025% or less of N, 2.09-2.15% of Mn, and the balance Fe and residual elements. The smelting method of the molybdenum-containing stainless steel comprises the steps of AOD refining, tapping to ladles, LF refining and continuous casting, wherein the AOD refining step is characterized in that molten iron is added, then molybdena spheres and lime are added to an AOD converter, eight processes of a decarburization reaction are carried out, and finally reduction and desulphurization are carried out. MoO3 reacts with CaO in the AOD converter to form CaMoO4 which has a high melting point and is nonvolatile, the high temperature of the molten iron in the converter can rapidly melt the molybdena spheres, and the elements comprising C, Si, Mn, Fe and the like in the molten iron and a good dynamics stirring condition in the AOD converter are utilized to reduce the molybdena spheres to realize rapid reduction of molybdena and the direct alloyage of the molybdena in the molten iron, so the method has the advantages of low production cost, simple operation and easy control.

Description

technical field [0001] The invention belongs to the technical field of stainless steel smelting, and in particular relates to a molybdenum-containing stainless steel and a smelting method thereof. Background technique [0002] Ferromolybdenum is generally used as an alloy additive in steelmaking, and as an addition of molybdenum in steelmaking. Adding molybdenum to the steel can make the steel have a uniform fine-grained structure, improve the hardenability of the steel, and help eliminate temper brittleness. Molybdenum is added as a beneficial element in stainless steel such as austenitic stainless steel and duplex stainless steel, which can effectively improve the corrosion resistance of stainless steel. Molybdenum-containing stainless steels in domestic and foreign standards mainly include: 0Cr17Ni12Mo2 (316), 00Cr17Ni12Mo2 (316L), 0Cr17Ni12Mo2N (316N), 0Cr19Ni13Mo3 (317), 00Cr19Ni13Mo3 (317L), 00Cr22Ni5Mo3N (2205) and other steel types, which have broad market prospects...

Claims

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Application Information

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IPC IPC(8): C22C38/44C22C33/06
Inventor 王建新陈兴润白小军
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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