Boron-added high-carbon and microalloyed high-strength carbon clean steel and preparation method thereof

A micro-alloying and high-strength technology, applied in the direction of manufacturing converters and improving process efficiency, can solve the problems of harmful elements, high inclusion content, limited mechanical properties, and plastic deformation of plates, saving precious alloying elements, Low production cost and small plastic deformation damage

Active Publication Date: 2018-06-12
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-added high-carbon and microalloyed high-strength carbon clean steel and preparation method thereof
  • Boron-added high-carbon and microalloyed high-strength carbon clean steel and preparation method thereof
  • Boron-added high-carbon and microalloyed high-strength carbon clean steel and preparation method thereof

Examples

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preparation example Construction

[0041] In the second aspect, the present invention provides a method for preparing the above-mentioned high-strength carbon pure steel. The method is a production process with converters, RH (or VD) furnaces, LF furnaces, continuous casting, etc. as the main equipment, and is carried out by blast furnace molten iron. Products are prepared by powder spraying and desulfurization pretreatment, converter with pure steel scrap, double slag removal of P technology, slag blocking and tapping for carbon increase, RH (or VD) degassing, LF furnace refining temperature composition adjustment, continuous casting and other treatment methods; The method includes the following steps:

[0042] Step 1. Desulfurization pretreatment of molten iron: spray desulfurization powder into the molten iron in the molten iron tank for desulfurization treatment, and then perform slag removal treatment to obtain desulfurized molten iron. The mass percentage of sulfur in the desulfurized molten iron is less t...

Embodiment 1

[0073] The high-strength carbon pure steel of the present embodiment is composed of the following mass percentages:

[0074] C

Si

mn

P

S

Cr

Mo

V

B

0.70％

0.27％

0.30％

0.006％

0.003％

0.35％

0.15％

0.15％

0.05％

[0075] The balance is Fe and unavoidable impurities.

[0076] The preparation method of the high-strength carbon pure steel of the present embodiment comprises the steps:

[0077] (1) Hot metal desulfurization pretreatment: spray desulfurization powder into the molten iron in the molten iron tank for desulfurization treatment at 1400° C., and then carry out slag removal treatment to obtain desulfurized hot metal. The mass percentage of sulfur in the desulfurized hot metal is less than or equal to 0.0020%. The desulfurization powder is a mixture of lime powder and metal magnesium powder with a mass ratio of 25:1.

[0078] (2) Add slagging agent in advance: add 1 / 3 of the total mass of slagging agent (lime)...

Embodiment 2

[0107] The composition ratio of the high-strength carbon pure steel of this embodiment is the same as that of Example 1; its preparation method is the same as that of Example 1 except steps (2) and (3).

[0108] In this embodiment, steps (2) and (3) in Example 1 are replaced by the following operations: the slagging agent is added into the converter in two parts, and the above-mentioned desulfurized hot metal and scrap steel are added to the converter for blowing treatment, mainly in the removal of P During the period, within 1-3 minutes after the start of the above blowing treatment, add the first part of slagging agent to the converter, and control the temperature of the blowing treatment to about 1560°C; if the temperature of the molten steel in the converter is higher than 1580°C, it can be Add pellets to the molten steel to cool down. After the dephosphorization-based period, the P content in the molten steel is within 0.008wt%. The molten steel at this time is called de-P...

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Abstract

The invention belongs to the technical field of special steel and special steel smelting, and relates to boron-added high-carbon and microalloyed high-strength carbon clean steel and a preparation method thereof. The high-strength carbon clean steel consists of the following components of, by mass percent, 0.67-0.75% of C, 0.15-0.37% of Si, 0.30-0.80% of Mn, less than or equal to 0.012% of P, lessthan or equal to 0.006% of S, 0.20-0.50% of of Cr, less than or equal to 0.30% of Mo, less than or equal to 0.30% of V, 0.002-0.100% of B, and the balance Fe and unavoidable impurities. The contentsof harmful elements, namely, S, P, O and N are further reduced, the inclusion contents are reduced, and molten steel is purified, so that the mechanical property of the boron-added high-carbon and microalloyed high-strength carbon clean steel is improved substantially; and through the synergistic effect of the reasonable matching ratios of the various components of the boron-added high-carbon andmicroalloyed high-strength carbon clean steel and the steps and parameters of the preparation method, the mechanical property of the boron-added high-carbon and microalloyed high-strength carbon cleansteel is further improved.

Description

technical field [0001] The invention belongs to the technical field of special steel and its smelting, and relates to a boron-added high-carbon and micro-alloyed high-strength carbon pure steel and a preparation method thereof. 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32C22C33/06C21C1/02C21C7/10C21C5/28
CPCC21C1/025C21C5/28C21C7/10C22C33/06C22C38/02C22C38/04C22C38/22C22C38/24C22C38/32Y02P10/20
Inventor 潘孝定罗俊义王德洪叶超王璞
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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