CN115747403A - Smelting method of high-cleanliness seamless pipe steel - Google Patents
Smelting method of high-cleanliness seamless pipe steel Download PDFInfo
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- CN115747403A CN115747403A CN202211380329.6A CN202211380329A CN115747403A CN 115747403 A CN115747403 A CN 115747403A CN 202211380329 A CN202211380329 A CN 202211380329A CN 115747403 A CN115747403 A CN 115747403A
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Abstract
The invention discloses a smelting method of high-cleanliness seamless steel tube, which comprises the following steps: molten iron pretreatment → 100 tons of top-bottom combined blown converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting; smelting in a converter: the converter end point adopts aluminum oxide, and the adding amount of aluminum iron is 1.5-3.0kg/t; refining in an LF furnace: ensuring that Al is more than or equal to 0.04% when in-place, and feeding a high-calcium wire for calcium treatment when LF is out-of-place; VD vacuum treatment: the vacuum degree is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 10min; the soft blowing time is controlled to be more than 15min, and the molten steel cannot be exposed; continuous casting of round billets: protective pouring is adopted to prevent secondary oxidation of molten steel; pouring at constant drawing speed. The invention improves the cleanliness of the molten steel through the control of each process, and lays a foundation for high-cleanliness seamless pipe steel.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for smelting high-cleanliness seamless pipe steel.
Background
The control of the cleanliness of molten steel is a comprehensive technology, and the optimization of steelmaking and continuous casting processes is the basis for developing and producing high value-added products. The means of steel smelting production for controlling the cleanliness of molten steel are basically divided into two categories: the first kind adopts molten iron pretreatment, converter smelting, external refining and continuous casting process to produce clean steel, and is characterized in that the external refining is used as a main means for controlling the cleanliness of the molten steel; and the second type controls the cleanliness of molten steel by realizing the three-separation pretreatment of molten iron. Due to the particularity of the use of the seamless pipe steel, the cleanliness requirement of molten steel is higher, so that the cleanliness of the molten steel is improved by controlling the smelting process of the seamless pipe steel, and a foundation is laid for the seamless pipe steel with high cleanliness.
The Chinese patent with the application number of 201110302240.3 discloses a production method of clean steel, which comprises the steps of smelting in a converter, adopting a double-slag steelmaking process, adding a deoxidizer for reduction treatment, and stopping slag and tapping; refining in an LF furnace, feeding electricity to melt solid slag, and feeding a silicon-calcium-barium alloy wire for immersion deoxidation treatment; feeding wires by a buggy ladle, feeding aluminum wires by the buggy ladle for deoxidation, controlling the aluminum content of the finished famous product, then feeding calcium silicate wires for modification and further strengthening deoxidation treatment, and controlling the calcium content of the finished product; refining in a VD furnace; and (4) continuous casting. The method improves the alloy yield and the cleanliness of the product in the refining process, and is widely applied to the production process of clean steel.
Chinese patent application No. 202010209525.1 discloses a production method of high-cleanliness sulfur-containing aluminum-containing steel, blowing is carried out by a top-bottom blowing converter, and molten steel is subjected to composite deoxidation, alloying and slagging in the tapping process; heating, slag surface diffusion deoxidation and molten steel precipitation deoxidation in the LF refining process, not intentionally desulfurizing, controlling the bottom blowing stirring argon flow of a ladle in the whole refining process, and performing calcium treatment and soft blowing on the molten steel before the refining is out of the station; transferring the molten steel to an RH station, feeding a sulfur line to a molten steel sulfur increasing value target value according to the residual sulfur content of the molten steel, performing vacuum treatment again, breaking the space, and performing micro-calcium treatment denaturation again; standing the molten steel for soft blowing; the arc-shaped continuous casting machine protects casting and realizes high-cleanliness control of molten steel.
Chinese patent application No. 202010100971.9 discloses a cleanliness control method for IF deep drawing steel, which combines the production and removal of inclusions in practical production processes such as converter process, RH refining process, and casting machine process to analyze, formulate a removal process for reducing the production of inclusions and optimizing the inclusions in the production process, prevent secondary oxidation in the casting machine casting process, and realize stable control of high cleanliness of lower inclusions in IF steel.
Disclosure of Invention
In order to solve the technical problems, the invention aims to provide a smelting method of high-cleanliness seamless pipe steel, which adopts a converter → LF furnace refining → VD vacuum treatment → round billet continuous casting process for production, improves the cleanliness of molten steel through the control of all working procedures, and lays a foundation for the high-cleanliness seamless pipe steel.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a smelting method of high-cleanliness seamless steel tube, which comprises the following production process flows: molten iron pretreatment → 100 tons of top-bottom combined blown converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting;
smelting in a converter: the converter end point adopts aluminum oxide, and the adding amount of aluminum iron is 1.5-3.0kg/t;
refining in an LF furnace: ensuring that Al is more than or equal to 0.04% in place, and feeding a high-calcium line for calcium treatment when LF is out of place;
VD vacuum treatment: the vacuum degree is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 10min; the soft blowing time is controlled to be more than 15min, and molten steel cannot be exposed;
continuous casting of round billets: protective pouring is adopted to prevent secondary oxidation of molten steel; pouring at constant drawing speed.
Compared with the prior art, the invention has the beneficial technical effects that:
the invention adopts the process of converter → LF furnace refining → VD vacuum treatment → round billet continuous casting for production, improves the cleanliness of molten steel, improves the qualification rate of inclusion grade, and reduces the rejection rate of seamless tube steel by 1.5 percent by the control of a seamless tube steel smelting method.
Drawings
The invention is further illustrated in the following description with reference to the drawings.
FIG. 1 shows the grades of inclusions in steel before and after the practice.
Detailed Description
A smelting method of high-cleanliness seamless pipe steel comprises the following production process flows: molten iron pretreatment → 100 tons of top-bottom combined blown converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting.
In the converter process, aluminum oxide is adopted at the end point of the converter, and the adding amount of the aluminum oxide is 1.5-3.0kg/t.
In the LF process, al is ensured to be more than or equal to 0.04% when in-position, and a high-calcium line is fed for calcium treatment when LF is out-of-position.
The VD process ensures that the vacuum degree is less than or equal to 0.06KPa and the deep vacuum time is more than or equal to 10min; the soft blowing time is controlled to be more than 15min, and the molten steel cannot be exposed.
The continuous casting process adopts protective pouring to prevent the secondary oxidation of molten steel; pouring at constant drawing speed.
Case 1:
the production process flow of the 20Mn2CZ comprises the following steps: molten iron pretreatment → 100 ton top-bottom combined blown converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting.
And (4) a converter process. The converter end point adopts aluminum oxide, and the adding amount of aluminum iron is 1.6-2.5kg/t.
TABLE 1 addition of deoxidizing agent
In the LF process, al is ensured to be more than or equal to 0.04% when in-position, and a high-calcium line is fed for calcium treatment when LF is out-of-position.
The VD process ensures that the vacuum degree is less than or equal to 0.06KPa and the deep vacuum time is more than or equal to 10min; the soft blowing time is controlled to be more than 15min, and the molten steel cannot be exposed.
TABLE 1 addition of deoxidizing agent
| Steel grade | Vacuum degree/KPa | Soft blowing time/min |
| 20Mn2(CZ) | 0.026 | 16 |
| 20Mn2(CZ) | 0.031 | 15 |
| 20Mn2(CZ) | 0.018 | 17 |
| 20Mn2(CZ) | 0.022 | 17 |
The continuous casting process adopts protective pouring to prevent the secondary oxidation of molten steel; pouring at constant casting speed of 1.2 m/min.
By adopting the smelting method of the seamless tube steel with high cleanliness, the quantity and the ratio of large-particle impurities in the steel are obviously reduced, the cleanliness of molten steel is improved, the qualification rate of impurity grades is improved, and the rejection rate is reduced by 1.5 percent, as shown in figure 1.
The above-described embodiments are only intended to illustrate the preferred embodiments of the present invention, and not to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (1)
1. A smelting method of high-cleanliness seamless pipe steel is characterized by comprising the following steps: the production process flow of the seamless steel tube comprises the following steps: molten iron pretreatment → 100 tons of top-bottom combined blown converter smelting → LF furnace refining → VD vacuum treatment → round billet continuous casting;
smelting in a converter: the converter end point adopts aluminum oxide, and the adding amount of aluminum iron is 1.5-3.0kg/t;
refining in an LF furnace: ensuring that Al is more than or equal to 0.04% in place, and feeding a high-calcium line for calcium treatment when LF is out of place;
VD vacuum treatment: the vacuum degree is less than or equal to 0.06KPa, and the deep vacuum time is more than or equal to 10min; the soft blowing time is controlled to be more than 15min, and the molten steel cannot be exposed;
continuous casting of round billets: protective pouring is adopted to prevent secondary oxidation of molten steel; pouring at a constant drawing speed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211380329.6A CN115747403A (en) | 2022-11-02 | 2022-11-02 | Smelting method of high-cleanliness seamless pipe steel |
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| CN202211380329.6A CN115747403A (en) | 2022-11-02 | 2022-11-02 | Smelting method of high-cleanliness seamless pipe steel |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN108660355A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of smelting process of high-cleanness, high pipe line steel |
| CN109161630A (en) * | 2018-09-25 | 2019-01-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of HIC resistance pipeline steel |
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- 2022-11-02 CN CN202211380329.6A patent/CN115747403A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104630418A (en) * | 2015-01-15 | 2015-05-20 | 南京钢铁股份有限公司 | High-cleanliness pipeline steel smelting process |
| CN108660355A (en) * | 2017-03-29 | 2018-10-16 | 鞍钢股份有限公司 | A kind of smelting process of high-cleanness, high pipe line steel |
| CN109161630A (en) * | 2018-09-25 | 2019-01-08 | 湖南华菱湘潭钢铁有限公司 | A kind of smelting process of HIC resistance pipeline steel |
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