Production method for low-cost clean steel

A production method and clean steel technology, which is applied in the field of metallurgy, can solve problems such as increased production costs, and achieve the effects of reduced cost per ton of steel, easy operation, and convenient operation

Inactive Publication Date: 2012-07-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For producers, using their own equipment and technology to improve the cleanliness of steel, unless the required cleanliness is too high, generally can achieve the goal, but the production cost will inevitably increase, and the user has to pay for the high cleanliness required by him. pay the corresponding price

Method used

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  • Production method for low-cost clean steel

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Experimental program
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Effect test

Embodiment 1

[0031]A production method of low-cost clean steel, the steps are as follows:

[0032] (1) Initial desulfurization of molten iron: In the process of iron folding in the blast furnace iron ditch and in the iron folding room, a kind of molten iron desulfurization sphere is added to the molten iron during the blast furnace tapping or iron folding process. The amount of the desulfurization sphere It is 2-8kg / t to ensure that S≤0.01% in weight percentage in molten iron after initial desulfurization.

[0033] (2) Desulfurization of molten iron pretreatment: use mixed CaO and Mg powder desulfurizers to carry out deep desulfurization of molten iron injection, and use a slag scraper to remove desulfurization slag. After deep desulfurization of molten iron, ensure that the molten iron before entering the converter is S≤ 0.0015%.

[0034] (3) Dephosphorization and sulfur control: dephosphorization and sulfur control in the converter smelting process to ensure that P≤0.014% and S≤0.004% i...

Embodiment 2

[0043] For the preparation of the desulfurization sphere, 55 kg of white slag, CaO 20 kg, CaF 2 5kg, CaCO 3 5kg of which CaO, CaF 2 , CaCO 3 And the particle size of the white slag recovered from the LF furnace is ≤100mm; it is made by dry pressing balls, the size of the balls is between 5-25mm, the compressive strength of the balls is between 5-35MPa, and the 1600℃ delayed burst reaction time is in 1~35s.

[0044] For the preparation of the dephosphorization spheres, 10 kg of white slag, CaO 65 kg, CaF 2 15 kg, CaCO 3 30 kg, including CaO, CaF 2 , CaCO 3 And the particle size of the white slag recovered from the LF furnace is ≤100mm; it is made by dry pressing balls, the size of the balls is between 5-25mm, the compressive strength of the balls is between 5-35MPa, and the 1600℃ delayed burst reaction time is in 1~35s.

[0045] For the preparation of the purified sphere, 60 kg of white slag, 15 kg of MgO, 15 kg of CaF 2 1kg, MgCO 3 5kg, Mg 1kg, of which CaF 2 ...

Embodiment 3

[0047] For the preparation of the desulfurization sphere, 35 kg of white slag, CaO 35 kg, CaF 2 10kg, CaCO 3 10kg of which CaO, CaF 2 , CaCO 3 And the particle size of the white slag recovered from the LF furnace is ≤100mm; it is made by dry pressing balls, the size of the balls is between 5-25mm, the compressive strength of the balls is between 5-35MPa, and the 1600℃ delayed burst reaction time is in 1~35s.

[0048] For the preparation of the dephosphorization spheres, 38 kg of white slag, 38 kg of CaO, 38 kg of CaO, 38 kg of CaO, and 38 kg of CaO are taken from LF refining process waste slag, that is, LF furnace cold recovery white slag according to the formula ratio. 2 10 kg, CaCO 3 12 kg, of which CaO, CaF 2 , CaCO 3 And the particle size of the white slag recovered from the LF furnace is ≤100mm; it is made by dry pressing balls, the size of the balls is between 5-25mm, the compressive strength of the balls is between 5-35MPa, and the 1600℃ delayed burst reaction...

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Abstract

The invention discloses a production method for low-cost clean steel, which comprises the following steps of initial desulfuration of liquid iron; initial desulfuration in iron folding processes in a blast furnace casting trough and between folded iron, and adding liquid iron desulfuration spheres into liquid iron in blast furnace casting or iron folding processes; dephosphorization and sulphur control; dephosphorization and sulphur control in a smelting process of a converter to guarantee that in a steel tapping process, phosphorus (P) is smaller than or equal to 0.014%, and sulphur (S) is smaller than or equal to 0.004%; quick slagging and dephosphorization; controlling a converter end point between 0.02-0.10%, adding dephosphorization spheres through an alloy runner in a converter tapping process, and simultaneously blowing argon to stir; purifying liquid steel in a Rockwell hardness (RH) refining process; adding purification spheres in later of RH refining treatment when the vacuum degree is 66.7-500Pa; and adopting whole course protection to pour in continuous casting. The production method effectively improves quality of steel materials and reduces smelting cost. Compared with the traditional process, raw materials of the production method are cheap, and cost of a ton of steel can be reduced by 5 to 10 yuan RMB.

Description

technical field [0001] The invention relates to a steelmaking production technology, in particular to a production method of low-cost clean steel, belonging to the technical field of metallurgy. Background technique [0002] The cleanliness of steel is an important indicator reflecting the overall quality level of steel, usually evaluated by the content of harmful elements in steel and the quantity, shape and size of non-metallic inclusions. Obtaining "clean and pure" steel is usually to reduce and control residual elements such as P, S, N, H, T.O, C and Al, Ti in the steel. The single or combined effects of these elements affect the multiple properties of the steel. performance. In order to improve the inherent quality and performance of steel, the basic requirements for the development of iron and steel metallurgy technology are: (1) to remove harmful elements S, P, N, H, T.O (sometimes including C) in steel to the greatest extent; (2) to precisely control Element conten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/064C21C1/02C21C7/10B22D11/18C21C7/076
CPCY02P10/20
Inventor 唐复平李镇王晓峰费鹏孟劲松张越马勇王文仲张志文王小善郭猛赵志刚林阳辛国强姚伟智
Owner ANGANG STEEL CO LTD
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