CN105648143A - Technological method used for ferrormanganese alloy - Google Patents

Abstract

The invention relates to a technological method used for a ferrormanganese alloy, and the technological method is simple in process operation, is lower in prior-period investment cost and lower in cost of a production process. The technological method comprises the following steps: (1) additionally arranging one set of hoppers at a steel tapping side of an EAF furnace for adding high carbon ferromanganese; (2) before the EAF furnace taps steel, adding a proper amount of high carbon ferromanganese into the bottom of a ladle of the EVA furnace according to the content of Mn in the tapped steel of the EAF furnace, wherein the weight of the high carbon ferromanganese capable of being added is equal to (0.4%-the content of the Mn in the tapped steel of the EAF furnace)* amount of tapped steel of the EAF furnace/the content of Mn of the high carbon ferromanganese; and the content of the Mn is the weight percentage of the Mn.

Description

The process that a kind of manganeisen uses

Technical field

The present invention relates to the process that a kind of manganeisen uses.

Background technology

At present, the composition of the Mn% content of domestic type of stainless steel, it is substantially by completing at AOD furnace reduction period addition low-carbon (LC) silicomanganese or electrolytic manganese.

The technological process of present stage smelting stainless steel is essentially by two step method: EAF+AOD, or three-step approach: EAF+AOD+VOD,

If application number is the Chinese patent of 200810185554.8. Smelting stainless steel requires over AOD furnace and smelts, and completes decarbonizing process, it is ensured that the C% content in molten steel is up to standard in AOD furnace. But carbon period Mn% too high levels can lower oxygen decarburization effect in stove, increase the consumption of reduction silicon. Domestic manufacturer considers problem above, and general consideration adds low-carbon (LC) after the oxidation period ended and adjusts stainless Mn% content containing manganese alloy, but this method is relatively costly.

Summary of the invention

It is an object of the invention to overcome above shortcomings in prior art, and provide the process that a kind of manganeisen uses, technological operation is simple, and early investment cost is few, and production process cost is low.

This invention address that the problems referred to above be the technical scheme is that the process that a kind of manganeisen uses, it is characterised in that: comprise the steps:

(1), EAF stove tapping side install a set of hopper additional, be used for adding high carbon ferromanganese;

(2), before the tapping of EAF stove, according to the Mn content in the tapping of EAF stove, appropriate high carbon ferromanganese is being added at the bottom of EAF stove ladle by hopper; The Mn content of the high carbon ferromanganese weight that can add=(the Mn content of 0.4%-EAF stove tapping) �� EAF stove tap/high carbon ferromanganese; Described Mn content is the percentage by weight shared by Mn.

The present invention compared with prior art, has the following advantages and effect:

1, the present invention controls the Mn content in molten iron well, when not reducing the decarburization effect of oxygen, uses the high carbon ferromanganese of low price to replace part low-carbon (LC) silicomanganese or electrolytic manganese as far as possible, can be significantly reduced to this.

2, the present invention adds part high carbon ferromanganese before AOD furnace converts steel, reduces the consumption of low-carbon (LC) silicomanganese or electrolytic manganese, reduces ton steel smelting cost.

3, technological operation is simple, and early investment cost is few.

Detailed description of the invention

The present invention is described in further detail by the examples below, and following example are explanation of the invention and the invention is not limited in following example.

The present invention comprises the steps:

(1), EAF stove tapping side install a set of easy hopper additional, be used for adding high carbon ferromanganese.

(2), before the tapping of EAF stove, according to the Mn content in the tapping of EAF stove, appropriate high carbon ferromanganese is being added at the bottom of EAF stove ladle by hopper; The Mn content of the high carbon ferromanganese weight that can add=(the Mn content of 0.4%-EAF stove tapping) �� EAF stove tap/high carbon ferromanganese; Mn content of the present invention and percent symbol " % " are the percentage by weight shared by Mn.

The present invention test by actual production, finds (namely in molten iron, Mn% is not more than 0.4%) to greatest extent of Mn% in ladle, uses high carbon ferromanganese as far as possible, reduce cost of material under this limit. AOD furnace is blended into the average Mn% content of molten iron and brings up to 0.30% from 0.08%, with electric furnace weight of molten iron 75 tons calculating, on average adds the high carbon ferromanganese (75%) of 220kg in ladle. The high carbon ferromanganese cost of every 1kg1%Mn is 4.9/75=0.06533 unit, the cost of the low-carbon (LC) silicomanganese of every 1kg1%Mn is (6692-30% �� 7287)/60=0.07510 unit, cost saved by average every stove is=220 �� 75 �� (0.07510-0.06533)=161.2 yuan, year produces 8000 stoves, and year saves cost about 128.96 ten thousand yuan.

Contrast before being embodied as and after enforcement:

Before enforcement: table 1.

After enforcement: table 2.

Table 1 and table 2 are the contrast before each steel grade the invention process and after enforcement.

Find out from test data, when smelting 304 steel grade, when properly increasing AOD furnace and entering stove molten iron Mn%, to the smelting of AOD with consume without significant change, the feasibility of this scheme is described.

Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts and components, be named title etc. can be different, and the above content described in this specification is only to present configuration example explanation.

Claims (1)

1. the process that a manganeisen uses, it is characterised in that: comprise the steps:

(1), EAF stove tapping side install a set of hopper additional, be used for adding high carbon ferromanganese;

(2), before the tapping of EAF stove, according to the Mn content in the tapping of EAF stove, appropriate high carbon ferromanganese is being added at the bottom of EAF stove ladle by hopper; The Mn content of the high carbon ferromanganese weight that can add=(the Mn content of 0.4%-EAF stove tapping) �� EAF stove tap/high carbon ferromanganese; Described Mn content is the percentage by weight shared by Mn.