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Method for alloying Ca in high-aluminum calcium-sulfur composite free-cutting steel

A free-cutting steel and alloying technology, which is applied in the field of iron and steel smelting, can solve the problems that the content of key elements in the smelting method is not specified, the inability to achieve stable control of Ca, and the inability to achieve stable control of molten steel, etc., to avoid a large amount of production, easy to operate, The effect of good pourability of molten steel

Active Publication Date: 2021-08-20
SGIS SONGSHAN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However: 1) the patent is mainly aimed at molded products, and there is no castability problem; 2) the patent does not specify the smelting method and how to ensure the content of key elements
[0009] It can be seen from the above-mentioned known patents that at present, regarding the castability of high-alumina-calcium-sulfur composite free-cutting steel and the stability of key element content control, refining by adding Al first after vacuum breaking, and then adding Ca, LF or VD, etc. During the smelting process such as adding S first, then adding Al, and then adding calcium, the stable control of Ca during the smelting process cannot be achieved, let alone the stable control of the content of [Ca], [S], and [Al] elements during the cooling and pouring of molten steel. It is very difficult to realize multi-furnace continuous pouring in actual production

Method used

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  • Method for alloying Ca in high-aluminum calcium-sulfur composite free-cutting steel
  • Method for alloying Ca in high-aluminum calcium-sulfur composite free-cutting steel
  • Method for alloying Ca in high-aluminum calcium-sulfur composite free-cutting steel

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preparation example Construction

[0035] The present application provides an example of a high-aluminum calcium-sulfur composite free-cutting steel, which is produced by the above-mentioned preparation method. The main chemical components of the high-aluminum calcium-sulfur composite free-cutting steel include: C: 0.20wt%-0.50wt%, Si: 0.15wt%-0.35wt%, Mn: 0.60wt%-1.60wt%, P: 2 .

[0036] Through the above method of the present invention, on the basis of ensuring that the components of the final product meet: Al: 0.015wt% ~ 0.030wt%, S: 0.020wt% ~ 0.060wt%, Ca: 0.0015wt% ~ 0.0035wt%, can realize 4 furnaces and The above continuous pouring has greatly improved the production efficiency and economic benefits of the high-alumina-calcium-sulfur composite free-cutting steel.

Embodiment 1

[0039] Provide a kind of Ca alloying method of high aluminum calcium sulfur composite free-cutting steel, its chemical composition is shown in Table 1, prepare according to following smelting method:

[0040] The first step is a 130-ton top-bottom combined blowing converter.

[0041] Using 110 tons of molten iron + 20 tons of steel scrap as the main raw materials, the C content in the molten steel is 0.10wt% and the temperature is 1603°C when tapping. Add ferro-aluminium, carbon powder, ferrosilicon, ferromanganese, ferrochrome and slag during the tapping process.

[0042] The second step, LF refining.

[0043] After arriving at the LF station, first add lime, composite deoxidizer and other slag materials for slagging operation. The content of [Ca] in the steel after LF refining is 0.0010wt%.

[0044] The third step is RH vacuum smelting.

[0045] The pressure in the vacuum chamber was <67Pa and kept for 15 minutes. After vacuum refining and repressurization, Ca wire was f...

Embodiment 2

[0049] Provide a kind of Ca alloying method of high aluminum calcium sulfur composite free-cutting steel, its chemical composition is shown in Table 1, prepare according to following smelting method:

[0050] The first step is a 130-ton top-bottom combined blowing converter.

[0051] Using 110 tons of molten iron + 20 tons of scrap steel as the main raw materials, the C content in the molten steel is 0.12wt% and the temperature is 1590°C when tapping. Add ferro-aluminium, carbon powder, ferrosilicon, ferromanganese, ferrochrome and slag during the tapping process.

[0052] The second step, LF refining.

[0053] After arriving at the LF station, first add lime, composite deoxidizer and other slag materials for slagging operation. The content of [Ca] in the steel after LF refining is 0.0009wt%.

[0054] The third step is RH vacuum smelting.

[0055] The pressure in the vacuum chamber was <67Pa and kept for 18 minutes. After vacuum refining and repressurization, Ca wire was f...

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Abstract

The invention discloses a method for alloying Ca in high-aluminum calcium-sulfur composite free-cutting steel, and belongs to the field of steel smelting. The method includes procedures of converter or electric furnace smelting, LF refining, RH or VD vacuum treatment and continuous casting, and is characterized in that in the procedure of LF refining, end-point Ca content is controlled; and after the vacuum treatment ends, first Ca alloying, first Al alloying, second Ca alloying, S alloying and second Al alloying are sequentially carried out. The method has the advantages that the Ca is stably controlled in an alloying smelting process, the content of [Ca], [S] and [Al] elements is stably controlled in a molten steel cooling and pouring process, Al2O3 and CaS inclusions which are prone to block a nozzle are not prone to produce, the nozzle is not prone to clog, castability is good and the like.

Description

technical field [0001] The present application relates to the field of iron and steel smelting, and specifically relates to a method for alloying Ca in high-alumina calcium-sulfur composite free-cutting steel. Background technique [0002] Calcium-sulfur composite free-cutting steel is based on the sulfur-based free-cutting steel by adding a small amount of Ca element, so that the easily deformed MnS inclusions during thermal processing can be transformed into spindle-shaped (Ca, Mn)S inclusions, thereby further improving A class of composite free-cutting steels with cutting properties. In addition, calcium-sulfur composite free-cutting steel can also significantly improve the anisotropy of mechanical properties caused by long strips of MnS inclusions in sulfur-based free-cutting steel. At present, calcium-sulfur composite free-cutting steels are mainly used in medium-carbon automotive steels that have high requirements for mechanical properties and processing properties, s...

Claims

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Application Information

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IPC IPC(8): C21C7/00C21C7/10C22C38/02C22C38/04C22C38/60C22C38/06C22C33/06
CPCC21C7/0006C21C7/10C22C38/02C22C38/04C22C38/60C22C38/06C22C38/002C22C33/06
Inventor 鲁金龙龙鹄余大华丘文生李至荣刘栋张志明杨伟光
Owner SGIS SONGSHAN CO LTD
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