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Boron-adding high-carbon clean steel vacuum induction furnace smelting preparation method

A vacuum induction furnace, carbon pure steel technology, applied in the field of special steel and its smelting, can solve the problems of harmful elements, high inclusion content, limited mechanical properties, plastic deformation of plates, etc., saving precious alloying elements, and low production costs. , the effect of small plastic deformation damage

Active Publication Date: 2018-06-29
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, if carbon steel plates are used, the sintered plates are prone to plastic deformation and have a short service life; if high-strength alloy steel plates are used, the cost is high
Although high-quality carbon structural steel 70# steel is suitable for thermal processing at high temperatures (about 750 ° C), its components contain high levels of harmful elements and inclusions, and its mechanical properties are limited.

Method used

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  • Boron-adding high-carbon clean steel vacuum induction furnace smelting preparation method

Examples

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preparation example Construction

[0027] The invention provides a method for preparing the above-mentioned boron-added high-carbon pure steel (that is, high-strength carbon pure steel). The method uses a vacuum induction furnace as the main equipment of the production process, and the product is prepared by feeding raw materials such as industrial pure iron into the furnace. The preparation method comprises the following steps:

[0028] Step 1, ingredients: industrial pure iron, recarburizer (C ratio 0.7-0.8%, that is, after adding recarburizer, C in the recarburizer accounts for 0.7-0.8% by mass of industrial pure iron), Cr Strips, Mo strips, and V-Fe alloys are used as smelting ingredients.

[0029] Step 2: Vacuum induction furnace smelting:

[0030] Send the above-mentioned smelting ingredients into the vacuum induction furnace, and under the vacuum degree ≤ 20Pa (preferably 1-20Pa), send electricity to melt the ingredients;

[0031] When the molten steel temperature reaches 1580-1600°C (such as 1582°C, 1...

Embodiment 1

[0056] The present embodiment uses 25Kg vacuum induction furnace to smelt, and casts 25Kg shell ingot.

[0057] The high-strength carbon pure steel of the present embodiment is composed of the following mass percentages:

[0058] C

mn

Si

P

S

Cr

Mo

V

B

0.67

0.731

0.289

0.005

0.0006

0.328

0.001

0.18

0.0075

[0059] The balance is Fe and unavoidable impurities.

[0060] The preparation method of the present embodiment comprises the following steps:

[0061] (1) Ingredients: Industrial pure iron, recarburizer (C ratio 0.7-0.8%), Cr bar, Mo bar, V-Fe alloy are used as smelting ingredients.

[0062] (2) Vacuum induction furnace smelting:

[0063] a) Melting: Send the above-mentioned smelting ingredients into a vacuum induction furnace, and under a vacuum degree of 15Pa, send electricity to melt the ingredients;

[0064] b) Refining: When the temperature reaches 1590°C and the vacuum degree is 3Pa, start refini...

Embodiment 2

[0070] The present embodiment uses 25Kg vacuum induction furnace to smelt, and casts 25Kg shell ingot.

[0071] The high-strength carbon pure steel of the present embodiment is composed of the following mass percentages:

[0072] C

mn

Si

P

S

Cr

Mo

V

B

0.71

0.747

0.289

0.004

0.0004

0.341

0.001

0.13

0.0091

[0073] The balance is Fe and unavoidable impurities.

[0074] In the preparation method of this example, except that the amount of elements added in steps (1) and (2)-c) is different, other operations and parameters are the same as in Example 1.

[0075] The mechanical properties of the product obtained in this example are significantly enhanced: the tensile strength Rm is 1453 MPa, the yield strength R0.2 is 1404 MPa, and the elongation is 8.6%.

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Abstract

The invention belongs to the technical field of special steel and smelting of the special steel, and relates to a boron-adding high-carbon clean steel vacuum induction furnace smelting preparation method. Boron-adding high-carbon clean steel comprises, by mass, 0.67%-0.75% of C, 0.15%-0.37% of Si, 0.30%-0.80% of Mn, not larger than 0.012% of P, not larger than 0.006% of S, 0.20%-0.50% of Cr, not larger than 0.30% of Mo, not larger than 0.30% of V, 0.002%-0.100% of B and the balance Fe and inevitable impurities. The preparation method comprises the following steps of vacuum induction furnace smelting, smelting, continuous casting and the like. By means of the method, the mechanical property of the steel can be greatly improved, the product tensile strength Rm is larger than or equal to 1450MPa, the yield strength R0.2 is larger than or equal to 1350 MPa, a plate of the steel is used on a sintering saw web mother blank, the produced plastic deformation damage is small, the service lifeof the steel is prolonged, and the production cost of the steel is low.

Description

technical field [0001] The invention belongs to the technical field of special steel and its smelting, and relates to a preparation method for smelting boron-added high-carbon pure steel in a vacuum induction furnace. Background technique [0002] At present, when steel plates are used to sinter saw blades and other plates, they need to be heated to a certain temperature (about 750°C) during the processing process. The use environment is harsh, and the materials must withstand strong tensile forces and fatigue damage. At present, if carbon steel plates are used, the sintered plates are prone to plastic deformation and have a short service life; if high-strength alloy steel plates are used, the cost is high. Although high-quality carbon structural steel 70# steel is suitable for thermal processing at high temperatures (about 750 ° C), its components contain high levels of harmful elements and inclusions, and its mechanical properties are limited. [0003] Therefore, it is ne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/32C22C38/22C22C38/24C22C33/06
CPCC22C33/06C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32
Inventor 潘孝定罗俊义王德洪叶超王璞
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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