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Two-step stainless steel smelting method

A smelting method and stainless steel technology, applied in furnace types, furnaces, electric furnaces, etc., can solve the problems of long smelting cycle and high smelting cost, and achieve the effects of reducing smelting cost, improving dephosphorization rate, and strong variety development ability.

Active Publication Date: 2009-06-17
SHANDONG TAISHAN STEEL GROUP
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Problems solved by technology

[0010] The above smelting processes generally have the disadvantages of high smelting cost and long smelting cycle.

Method used

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Examples

Experimental program
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Effect test

Embodiment

[0033] Implement this plan in our stainless steel factory to produce martensitic stainless steel (C≤0.05%, Si0.30-0.60%, Mn≤0.50%, P≤0.035%, S≤0.008%) of 06Cr13 (SUS410S), Cr13.0—13.5%, Ni≤0.20%, Cu0.08—0.1%) as an example, the process flow is dephosphorization molten iron → electric furnace → slag removal station → GOR → LF → continuous casting → finishing → qualified inspection → rolling . Include the following steps:

[0034] 1. Smelting of molten iron for dephosphorization: The molten iron for dephosphorization is smelted in a top-bottom combined blowing converter. During dephosphorization, the working oxygen pressure of top blowing is (0.70-0.85) MPa, and the basic gun position is 1000 mm. According to the furnace type and loading capacity, Properly adjust and carry out bottom blowing nitrogen throughout the whole process. Under the working pressure of 1.5MPa, the supply strength of bottom blowing will reach 0.12-0.2Nm 3 / t min, lime (60-70) kg / t, 1 / 2-2 / 3 of the total a...

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Abstract

The invention relates to a stainless steel smelting method by a two-step process. The method comprises the following steps: (1) smelting dephosphorized molten iron; (2) smelting semisteel; (3) lifting the semisteel to a deslagging station for deslagging treatment; (4) adding the semisteel to a GOR refining furnace for air refining; (5) refining; (6) continuous casting and (7) finishing, thinning and then rolling. Compared with the present method for producing the stainless steel by smelting, the method has the advantages of wide application scope of raw materials, low energy and resource consumption, strong variety development capacity, high recovery rate of chromium-nickel metal, high production efficiency and the like. Sulfide, oxide, silicate and punctiform non-metallic inclusion in the steel have low grade, the dephosphorized molten iron is provided by a top-bottom combined blowing converter and smelting is performed by the two-step process in an EAF+GOR refining furnace, thus the method has relatively low production cost and relatively large cost advantage, and the performance of a rolled finished product is consistent with a user quality standard.

Description

technical field [0001] The invention relates to a stainless steel smelting method, specifically a two-step stainless steel smelting method which adopts dephosphorized molten iron and high-carbon alloy, melts semi-steel through an electric furnace, and decarburizes in a GOR converter to adjust the composition. Background technique [0002] Stainless steel is a common alloy steel, which can be generally divided into austenitic stainless steel, ferritic stainless steel, martensitic stainless steel and duplex stainless steel. [0003] At present, the stainless steel smelting process can be divided into one-step method, two-step method and three-step method. [0004] 1. One-step method [0005] The one-step method refers to the completion of scrap melting, decarburization, reduction and refining processes in the electric furnace, and the furnace charge is smelted into stainless steel in one step. With the continuous development of the refining process outside the furnace, the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/00C21C5/52C21C7/06B22D11/00
CPCY02P10/20
Inventor 高振民陈培敦吕圣会黄延飞杨东王明军乔春刚亓传军赵刚
Owner SHANDONG TAISHAN STEEL GROUP
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