A vacuum induction furnace smelting preparation method of zirconium-added high-carbon pure steel

A vacuum induction furnace, carbon pure steel technology, applied in furnaces, electric furnaces, furnace types, etc., can solve problems such as harmful elements, high content of inclusions, limited mechanical properties, plastic deformation of plates, etc., to achieve good product stability and production The effect of low cost and small plastic deformation damage

Active Publication Date: 2020-05-12
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Description
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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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  • A vacuum induction furnace smelting preparation method of zirconium-added high-carbon pure steel
  • A vacuum induction furnace smelting preparation method of zirconium-added high-carbon pure steel
  • A vacuum induction furnace smelting preparation method of zirconium-added high-carbon pure steel

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preparation example Construction

[0027] The invention provides a method for preparing the above-mentioned zirconium-added high-carbon pure steel (that is, high-strength carbon pure steel). The method uses a vacuum induction furnace as the main equipment in the production process, and the product is prepared from raw materials such as industrial pure iron fed 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,...

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 Zr 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 refining, the refining time is 45min, an...

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 Zr 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 1423 MPa, the yield strength R0.2 is 1384 MPa, and the elongation is 9.3%.

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Abstract

The invention belongs to the technical field of special steel and smelting, and relates to a method for preparing zirconium-adding high-carbon clean steel through smelting by a vacuum induction furnace. The zirconium-adding high-carbon clean steel is prepared from the following components in percentage by mass: 0.67 to 0.75 percent of C, 0.15 to 0.37 percent of Si, 0.30 to 0.80 percent of Mn, lessthan or equal to 0.012 percent of P, less than or equal to 0.006 percent of S, 0.20 to 0.50 percent of Cr, less than or equal to 0.30 percent of Mo, less than or equal to 0.30 percent of V, 0.002 to0.100 percent of Zr, and the balance Fe and inevitable impurities. The preparation method comprises the following steps of smelting through the vacuum induction furnace, smelting, continuously castingand the like. According to the product prepared through the method provided by the invention, the tensile strength Rm is larger than or equal to 1400MPa, the yield strength R0.2 is larger than or equal to 1300MPa, and when a panel of the product is applied to sintering a saw blade mother plate, the produced plastic deformation damage is less, so that the life is prolonged, and the steel production cost is low.

Description

technical field [0001] The invention belongs to the technical field of special steel and its smelting, and relates to a vacuum induction furnace smelting preparation method of zirconium-added high-carbon pure steel. 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 nece...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C21C5/52C22C33/06
CPCC21C5/5241C22C33/06C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28Y02P10/20
Inventor 潘孝定罗俊义王德洪叶超王璞
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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