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Steelmaking method in vacuum induction furnace

A vacuum induction furnace, pure iron technology, applied in furnaces, electric furnaces, furnace types, etc., can solve the problems of fast crucible loss, difficulty of ingots, low production efficiency, etc., and achieve the effect of improving cleanliness and simple process

Inactive Publication Date: 2012-05-30
PANGANG GROUP VANADIUM TITANIUM & RESOURCES +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current vacuum induction furnace steelmaking method has the following disadvantages: it is still difficult to control the cleanliness of steel ingots; it takes a long time to melt pure iron raw materials, resulting in low production efficiency; Causes crucible to wear out faster

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] This example illustrates in detail the method for making steel in a vacuum induction furnace provided by the present invention by preparing X100 pipeline steel.

[0028] The mass percentages of components required for X100 pipeline steel are: C content ≤0.06 mass%, Si content 0.15-0.30 mass%, Mn content 1.80-2.00 mass%, P content ≤0.010 mass%, S content Content ≤ 0.003 mass%, Mo content 0.15-0.25 mass%, Ni content 0.25-0.45 mass%, Cr content 0.15-0.25 mass%, Cu content 0.15-0.25 mass%, Nb content The content of V is 0.040-0.060% by mass, the content of V is 0.06-0.09% by mass, and the content of Ti is 0.010-0.025% by mass.

[0029] Because the X100 pipeline steel requires low C content, considering that both pure iron and the added alloy contain a certain amount of C, graphite is no longer added in the carbon preparation step.

[0030] 18 rod-shaped pure iron raw materials with a size of 3cm×3cm×22.6cm (C content is less than 0.01 mass%, S content is less than 0.001 ma...

Embodiment 2

[0043] This example illustrates in detail the method for making steel in a vacuum induction furnace provided by the present invention by preparing X120 pipeline steel.

[0044] The mass percentages of components required for X120 pipeline steel are: the content of C is ≤0.06 mass%, the content of Si is 0.15-0.30 mass%, the content of Mn is 1.80-2.00 mass%, the content of P is ≤0.010 mass%, the content of S Content ≤ 0.005 mass%, Mo content 0.15-0.25 mass%, Ni content 0.25-0.45 mass%, Cr content 0.15-0.25 mass%, Cu content 0.15-0.25 mass%, Nb content The content of Ti is 0.040-0.060% by mass, the content of Ti is 0.010-0.025% by mass, and the content of B is 0.0010-0.0020% by mass.

[0045] Because X120 pipeline steel requires low C content, considering that both pure iron and the added alloy contain a certain amount of C, graphite is no longer added in the carbon preparation step.

[0046] Weld 10 rod-shaped pure iron raw materials with a size of 3.2cm×3.2cm×36cm (C content i...

Embodiment 3

[0052] In this example, the method for making steel in a vacuum induction furnace provided by the present invention is described in detail by preparing steel for engineering machinery with a yield strength of 800 MPa.

[0053] The mass percentages of components required for steel for construction machinery with a yield strength of 800MPa are: C content of 0.04-0.08 mass%, Si content of 0.15-0.30 mass%, Mn content of 1.60-1.80 mass%, P content of ≤ 0.015 mass%, S content ≤ 0.005 mass%, Mo content 0.15-0.25 mass%, Ni content 0.25-0.40 mass%, Cr content 0.30-0.40 mass%, Nb content 0.040-0.060 % by mass, the content of V is 0.06-0.09 mass % and the content of Ti is 0.010-0.025 mass %.

[0054] 24 rod-shaped pure iron raw materials with a size of 2.5cm×2.5cm×24.5cm (C content is less than 0.01 mass%, S content is less than 0.001 mass%) are welded by electric welding with CHE422 electrodes to a bottom area of ​​50cm 2 And the columnar pure iron raw material block with a height of 7...

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Abstract

The invention provides a steelmaking method in a vacuum induction furnace. The method comprises the following steps of: placing a monoblock pure iron raw material in the crucible of the vacuum induction furnace; then under the vacuum condition, completely smelting the pure iron raw material; and subsequently, successively carrying out carbon distribution, deoxidation and alloying steps. The steelmaking method in the vacuum induction furnace is simple in process, and can be used for improving the cleanliness of molten steel, shortening the smelting time of the pure iron raw material and prolonging the service life of the crucible.

Description

technical field [0001] The invention relates to a method for making steel in a vacuum induction furnace. Background technique [0002] Vacuum induction melting has obvious effects in metal purification, composition control, performance improvement and cleanliness. Vacuum induction melting alloys with low inclusion content, small size and precise composition have improved physical, mechanical and corrosion resistance properties. [0003] However, the current vacuum induction furnace steelmaking method has the following disadvantages: it is still difficult to control the cleanliness of steel ingots; it takes a long time to melt pure iron raw materials, resulting in low production efficiency; The crucible wears out faster. Contents of the invention [0004] In order to overcome the above-mentioned shortcomings of the current vacuum induction furnace steelmaking method, the present invention provides a vacuum induction furnace steelmaking method, which can improve the cleanl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/52C22C33/04
Inventor 冯远超曾建华左军严学模陈亮叶晓喻杨峰余腾义
Owner PANGANG GROUP VANADIUM TITANIUM & RESOURCES
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