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Silicon-manganese-calcium alloy and its production method

A technology of calcium alloy and ferrosilicon, which is applied in the low-phosphorus and low-carbon silicon-manganese-calcium alloy. In the production field of this alloy, it can solve the problems of high content of alloy inclusions, difficulty in controlling alloy composition, and low smelting temperature.

Inactive Publication Date: 2003-03-26
于跃华
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Furthermore, even if the aforementioned silicon-manganese-aluminum alloy is designed, how to produce it cost-effectively is another issue
It is difficult to control the required alloy composition by simultaneously reducing silicon, manganese and calcium by the submerged arc furnace method; to produce this alloy by the induction furnace thermal conversion method, the smelting temperature is low, the loss is large, and the cost is high. The alloy produced by the method has a high content of inclusions, so the induction furnace heating method is not suitable for the production of the above-mentioned silicon-manganese-calcium alloy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Will contain SiO 2 More than 98%, containing Al 2 o 3 Silica less than 1.5%, semi-coke containing more than 80% fixed carbon and less than 6% ash, and clean steel shavings are divided into 6 batches in low-frequency mines with a working frequency of 0.5-12.5Hz at a weight ratio of 200:128:50. Smelted in a hot furnace. After the crucible area is formed in the furnace, add silicomanganese alloy, lime and fluorite with the brand name FeMn68Si18. The amount of silicomanganese alloy added is controlled according to the manganese content in the finished product. Then continue smelting for 2-2.5 hours. Add the silicon-calcium alloy containing 28% Ca and 60% Si into the ladle before it is released from the furnace. The quantity depends on the Ca content in the finished product. The alloy melts. The mixed molten metal is cast into an ingot, and after cooling, it is crushed to obtain a silicon-manganese-calcium alloy whose composition is (weight)

[0022] Si 38% Mn 35.8% Ca...

Embodiment 2

[0026] Smelting 6 furnaces of 304 cold-rolled stainless steel in a 30-ton AOD furnace. When the oxygen blowing reaches the end carbon, deoxidation and alloying are carried out with the silicon-manganese-calcium alloy, ferrosilicon and ferrochrome of the present invention. The composition of described silicon-manganese-calcium alloy is shown in Table 1

[0027] Table 1 Composition of Mn-Si-Ca alloy (% by weight)

[0028] The Mn-Si-Ca alloy, the addition amount of Si-Fe and Cr-Fe and the oxygen content and Al content in the finished product are shown in Table 2.

[0029] Stoves

Alloy addition amount (kg)

[Al] content in finished steel (% by weight)

Cr-Fe

Si-Fe

Mn-Si-Ca

〔Al〕

〔O〕

1

280

470

620

0.008

0.0065

2

342

633

0.007

0.0078

3

1680

260

756

0.01

4

240

240

540

0.008

5

806

...

Embodiment 3

[0033] Smelting 6 furnaces of 304 cold-rolled stainless steel in a 30-ton AOD furnace. When oxygen blowing reaches the end carbon, deoxidize and alloy with conventional silicon-manganese-aluminum alloys, ferrosilicon and ferrochrome. The Mn-Si-Al alloy, the addition amount of SI-Fe and Cr-Fe and the Al content and oxygen content in the finished product are shown in Table 3.

[0034] Stoves

Alloy addition amount (kg)

〔Al〕〔o〕content in finished steel (% by weight)

Cr-Fe

Si-Fe

Mn-Si-Al

〔Al〕

〔O〕

1

710

530

558

0.01

2

463

398

600

0.008

0.0071

3

110

462

450

0.1

0.0088

4

630

400

638

0.1

5

400

510

0.007

0.0097

6

410

540

0.1

[0035] From the results in Table 3,...

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PUM

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Abstract

The invention refers to steel-smelting deoxidizing agent, Si-Mn-Ca alloy. The components: Mn 33-47%, Si 30-45%, Ca 1-15%, C<=0.3%; P<=0.04%; the rest are Fe and impurity. The step of producing method; use mineral heating furnace, especially a 0.5-12.5 Hz low-frequency furnace to produce silicon rion, then add Mn-Si alloy, lime and and jade-like stone into silicon-iron melting pool; then pour the metal melt into iron-melt package containing Si-Ca alloy.

Description

1. Technical field [0001] The invention relates to a silicon-manganese-calcium alloy used as a steel-making deoxidizer, especially a low-phosphorus and low-carbon silicon-manganese-calcium alloy; the invention also relates to a production method of the alloy. 2. Background technology [0002] The traditional silicon-manganese-aluminum alloy has been adopted by the steelmaking industry for many years because of its low melting point and the advantages of easy deoxidation products floating in molten steel. However, for steels with strict requirements on aluminum, such as 304 cold-rolled stainless steel, this aluminum-containing silicon-manganese-aluminum alloy is not suitable, so the steelmaking industry, especially the manufacturers of stainless steel, urgently need a kind of energy A new alloy that replaces the traditional SiMnAl. An ideal substitute product for the silicon-manganese-aluminum alloy is silicon-manganese-calcium alloy. However, due to the very limited solubi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/06C22C1/02C22C30/00
Inventor 于跃华
Owner 于跃华