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Zirconium-added high-carbon microalloyed high-strength carbon clean steel and preparation method

A micro-alloying and high-strength technology is applied in the direction of manufacturing converters and improving process efficiency. It can solve problems such as harmful elements, high content of inclusions, limited mechanical properties, and plastic deformation of plates, so as to reduce the content of inclusions, The effect of low production cost and small plastic deformation damage

Active Publication Date: 2018-06-22
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 temperature (about 750°C), its composition contains high levels of harmful elements and inclusions, and its mechanical properties are limited.

Method used

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  • Zirconium-added high-carbon microalloyed high-strength carbon clean steel and preparation method
  • Zirconium-added high-carbon microalloyed high-strength carbon clean steel and preparation method
  • Zirconium-added high-carbon microalloyed high-strength carbon clean steel and preparation method

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preparation example Construction

[0042] 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:

[0043] 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

[0074] The high-strength carbon pure steel of the present embodiment is composed of the following mass percentages:

[0075] C

Si

mn

P

S

Cr

Mo

V

Zr

0.70％

0.27％

0.30％

0.006％

0.003％

0.35％

0.15％

0.15％

0.06％

[0076] The balance is Fe and unavoidable impurities.

[0077] The preparation method of the high-strength carbon pure steel of the present embodiment comprises the steps:

[0078] (1) Hot metal desulfurization pretreatment: the molten iron that desulfurization powder is sprayed into molten iron tank carries out desulfurization treatment at 1400 ℃, then carries out slag removal treatment, obtains desulfurized molten iron, and the mass percent of sulfur in this desulfurized molten iron 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.

[0079] (2) Add slagging agent in advance: add 1 / 3 of the total ma...

Embodiment 2

[0108] The composition ratio of the high-strength carbon pure steel of the present embodiment is the same as that of Example 1; its preparation method is all the same as that of Example 1 except steps (2) and (3).

[0109] 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-mentioned 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 thi...

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Abstract

The invention belongs to the technical fields of special steels and smelting thereof and relates to a zirconium-added high-carbon microalloyed high-strength carbon clean steel and a preparation methodthereof. The high-strength carbon clean steel comprises, by mass percentage, 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, less than or equal to 0.006% of S,0.20-0.50% 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 Zr and the balance Fe and inevitable impurities. According to the high-strength carbon clean steel, the contents of the harmful elements S, P, O and N are further lowered; the inclusion content is lowered; molten steel is purified; mechanical performance of the steel can be greatly improved; andreasonable mixing ratios of all components of the high-strength carbon clean steel and steps and parameters of the preparation method cooperatively act to jointly further improve mechanical performance of the high-strength carbon clean steel.

Description

technical field [0001] The invention belongs to the technical field of special steel and its smelting, and relates to a zirconium-added high-carbon, 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# is suitable for hot processing at high temperature (around 750°C), its composition contains high levels of harmful elements and inclusions, and its mechanical properties are limited. [0003] Therefore, it is n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C5/56C21C5/36C21C7/064C21C7/068C21C7/10C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28C22C33/06
CPCC21C5/36C21C5/567C21C7/0006C21C7/0025C21C7/064C21C7/0645C21C7/068C21C7/10C22C33/06C22C38/02C22C38/04C22C38/22C22C38/24C22C38/28Y02P10/20
Inventor 潘孝定罗俊义王德洪叶超王璞
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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