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Core material of magnesium-calcium-aluminum-iron alloy core-spun yarns and application thereof

A cored wire, aluminum alloy technology, applied to the core material and its application in the molten steel refining treatment process, can solve problems such as gaps and unsatisfactory calcium treatment effects, improve quality, avoid splashing or explosion, The effect of improving cleanliness

Inactive Publication Date: 2017-03-22
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, judging from the actual effect of domestic sulfur-containing steel, the effect of calcium treatment is not ideal, and there is still a large gap between the actual quality and the quality of foreign high-quality sulfur-containing steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In this embodiment, a magnesium-calcium-aluminum-iron alloy cored wire core material is prepared according to the following mass percentages: the magnesium content is 6wt.%, the calcium content is 5wt.%, and the aluminum content is 30wt.%. The rest is iron and unavoidable impurities.

[0017] Experimental test analysis:

[0018] The magnesium-calcium-aluminum-iron alloy cored wire core material of this embodiment is made into a cored wire and added to the molten steel of sulfur-containing special steel with a sulfur content of 0.025-0.4wt.%, to modify the sulfide in the sulfur-containing steel Treatment, through modification treatment, the sulfide in the steel is mainly composed of manganese sulfide inclusions, and the manganese sulfide and composite sulfide (composed of sulfide and magnesium oxide, calcium oxide, aluminosilicate, calcium aluminate, etc.) Coexisting state transitions: 75% for MnS alone and 25% for complex sulfides. Manganese sulfide inclusions that ex...

Embodiment 2

[0021] This embodiment is basically the same as Embodiment 1, especially in that:

[0022] In this embodiment, a magnesium-calcium-aluminum-iron alloy cored wire core material, its chemical composition is configured according to the following mass percentages: magnesium content is 25wt.%, calcium content is 24wt.%, aluminum content is 30wt.%, The rest are unavoidable impurities of iron.

[0023] Experimental test analysis:

[0024] The magnesium-calcium-aluminum-iron alloy cored wire core material of this embodiment is made into a cored wire and added to the molten steel of sulfur-containing special steel with a sulfur content of 0.025-0.4wt.%, to modify the sulfide in the sulfur-containing steel Treatment, due to the increase in the proportion of calcium and magnesium, the modification effect is significantly improved, the single MnS is 63%, the composite sulfide is 37%, and the proportion of sulfide ellipsoid in the rolled product (forging) is further increased, which impro...

Embodiment 3

[0026] This embodiment is basically the same as the previous embodiment, and the special features are:

[0027] In this embodiment, a magnesium-calcium-aluminum-iron alloy cored wire core material, its chemical composition is configured according to the following mass percentages: the content of magnesium is 10wt.%, the content of calcium is 9wt.%, and the content of aluminum is 30wt.%. The rest are unavoidable impurities of iron.

[0028] Experimental test analysis:

[0029] The core material of the magnesium-calcium-aluminum-iron alloy cored wire in this embodiment is made into a cored wire and added to the molten steel of sulfur-containing special steel with a sulfur content of 0.025-0.40wt.%, to modify the sulfide in the sulfur-containing steel , due to the further optimization of the ratio of calcium and magnesium, the metallurgical reaction is more gentle (when the content of calcium and magnesium is too high, it may cause an explosion), the proportion of sulfide ellips...

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Abstract

The invention discloses a core material of magnesium-calcium-aluminum-iron alloy core-spun yarns and application thereof. The core material of the magnesium-calcium-aluminum alloy core-spun yarns is characterized by being composed of, by weight, 6-25% of magnesium, 5-24% of calcium, 5-35% of aluminum and the balance iron and inevitable impurities, wherein the mass ratio of the magnesium to the calcium ranges from 6 to 11 to 18 to 11. In the refining process of molten steel, the core material of the magnesium-calcium-aluminum alloy core-spun yarns is made into the core-spun yarns and added into the molten steel to modify sulfides in sulfur-bearing steel. In the refining process, the core material of the magnesium-calcium-aluminum alloy core-spun yarns is fed to make the core-spun yarns, and therefore the morphology of the sulfides can be effectively adjusted and controlled, and the machinability and the comprehensive property of steel can be improved.

Description

technical field [0001] The invention relates to a core material of a cored wire and its application in a molten steel refining process, in particular to a core material of a magnesium-calcium-containing composite cored wire and its application in a molten steel refining process. Applied in the field of iron and steel metallurgy technology. Background technique [0002] Adding a certain amount of sulfur to steel can improve cutting performance. At present, sulfur-containing steel mainly includes gear steel with a sulfur content of 0.02wt.% to 0.04wt.%, non-quenched and tempered steel with a sulfur content of 0.03wt.% to 0.08wt.%, and a sulfur content of 0.08wt.%. ~0.4wt.% of free-cutting steel, etc. Sulfur-containing steel usually contains a certain amount of manganese, and the hot embrittlement of steel can be improved by controlling the ratio of manganese to sulfur in the steel. The form of sulfide inclusions in sulfur-containing steel determines the free-cutting perform...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C22C38/06C22C30/00
CPCC21C7/0056C21C7/0006C22C30/00C22C38/005C22C38/06
Inventor 付建勋刘辉王阳成娟杨乾坤张东
Owner SHANGHAI UNIV
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