Ni-containing stainless steel smelting method

A smelting method and stainless steel technology, applied in the field of Ni-containing stainless steel smelting, can solve the problems of uneconomical, high cost, waste of resources, etc., and achieve the effect of reducing costs

Active Publication Date: 2009-07-01
SHEN KAN QINHUANGDAO GENERAL ENG DESIGN & RES INST CORP MCC
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Problems solved by technology

[0005] The above processes all require high-grade raw ore, otherwise the cost will be higher, so some low-

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  • Ni-containing stainless steel smelting method

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Embodiment Construction

[0029] Such as figure 1 As shown, it is a stainless steel smelting process flow, and the Ni-containing stainless steel smelting method mainly includes the following steps:

[0030] Sinter low-grade nickel-containing and chromium-containing ores; smelt the sintered ores in a blast furnace; pretreat molten iron for desulfurization and dephosphorization; and form stainless steel mother liquor, melt alloys and stainless steel scraps in electric furnaces, and smelt stainless steel in argon-oxygen furnaces , VOD furnace refining; continuous casting into stainless steel billet.

[0031] The low-grade nickel-containing and chromium-containing ore is laterite ore, which is a nickel oxide ore containing 0.8-2.2% of Ni, 1-3% of Cr and 20-40% of Fe. The Ni content is generally >0.5%, and it is not worth using any lower. When using blast furnace to smelt molten iron, low-grade nickel-containing and chromium-containing ores are added to the charge of the blast furnace, and the high reduct...

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Abstract

The invention discloses a method for smelting stainless steel containing Ni, which is characterized in that the method mainly comprises the following steps: low-grade nickel-containing chromium-containing ore is dried and then is sintered; the sintered ore is smelted into molten iron containing the Ni in a blast furnace; the molten iron is subject to pretreatment desulfurization and dephosphorization to form a stainless steel mother solution; iron alloy is melted in an electric furnace; the refining is performed in a stainless steel smelting furnace and a VOD furnace; and a stainless steel billet is obtained by continuous casting. The low-grade nickel-containing chromium-containing ore is used to substitute for chromium and nickel alloy to smelt the stainless steel, so the cost for the stainless steel is reduced greatly. At the same time, the method can fully utilize the low-grade ore, ensure that the idle scarce resource is fully utilized, and can reduce cost.

Description

technical field [0001] The invention relates to a rational utilization of low-grade ore containing Cr and Ni and a stainless steel smelting process. Background technique [0002] The traditional stainless steel smelting process is generally divided into two categories, one is made of stainless steel scrap as raw material, which is remelted in an electric furnace and then added alloy material and refined; the other is made of molten iron, which is desulfurized in a converter , dephosphorization and partial decarburization, the alloy and some scrap steel are melted in the electric furnace, and the two are smelted together in the refining furnace. In the second process a large amount of ferrochrome, electrolytic nickel or ferronickel is required. The cost of alloys accounts for more than 80% of the cost of stainless steel, so the key to reducing the cost of stainless steel is to reduce the cost of adding alloys. [0003] Traditional nickel or ferronickel is made of high-grade...

Claims

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Application Information

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IPC IPC(8): C22C38/40
Inventor 胡嘉龙
Owner SHEN KAN QINHUANGDAO GENERAL ENG DESIGN & RES INST CORP MCC
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