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Ultralow-phosphorus continuous casting steel billet, and production method and application thereof

A production method and ultra-low phosphorus technology, applied in the direction of manufacturing converters, etc., can solve the problems of easy occurrence of crack arrest steel preparation process, low gas content, inability to obtain ultra-low phosphorus, etc.

Active Publication Date: 2022-02-11
ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the inability to obtain ultra-low phosphorus, low oxygen, low gas content, high purity and low segregation in the prior art The anti-cracking steel and problems such as phosphorus reversion are prone to occur in the preparation process, thereby providing an ultra-low phosphorus continuous casting billet and its production method and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] This embodiment provides a production method for continuous casting steel slabs, using a 180t converter double-connected method to smelt ultra-low phosphorus crack arresting steel, including the following steps,

[0058] (1) Pretreatment of raw materials

[0059] Steel scrap, nickel plate, copper block, and ferromolybdenum were all baked at 300°C for 1 hour, H 2 O content 0.05%, scrap steel S content 0.0035%, nickel plate S content 0.005%, copper block S content 0.01%, molybdenum iron S content 0.01%;

[0060] Aluminum, ferrosilicon, manganese metal, and ferro-titanium alloy are all baked at 200°C for 1.5 hours, the moisture content is 0.03%, the S content of metallic aluminum is 0.010%, the content of ferrosilicon S is 0.005%, the content of metallic manganese S is 0.015%, and the content of ferro-titanium alloy S 0.005%;

[0061] Lime and synthetic slag should be used within 36 hours after the preparation is completed, and the whole process should be sealed and stor...

Embodiment 2

[0073] The present embodiment provides a kind of production method of continuous casting billet, comprises the following steps,

[0074] (1) Pretreatment of raw materials

[0075] Steel scrap, nickel plate, copper block, and ferromolybdenum were all baked at 400°C for 0.7 hours, H 2 O content 0.03%, scrap steel S content 0.0030%, nickel plate S content 0.0040%, copper block S content 0.0085%, molybdenum iron S content 0.0091%;

[0076] Aluminum, ferrosilicon, manganese metal, and ferro-titanium alloy are all baked at 250°C for 1.2 hours, the moisture content is 0.015%, the S content of metallic aluminum is 0.0096%, the content of ferrosilicon 0.0034%, the content of metallic manganese S 0.011%, and the content of ferro-titanium alloy S 0.0047%;

[0077] Lime and synthetic slag should be used within 36 hours after the preparation is completed, and the whole process should be sealed and stored; the main components of lime are CaO content of 97%, H 2 O content 0.085%, S conten...

Embodiment 3

[0088] The present embodiment provides a kind of production method of continuous casting billet, comprises the following steps,

[0089] (1) Pretreatment of raw materials

[0090] Steel scrap, nickel plate, copper block, and ferromolybdenum were all baked at 500°C for 0.5 hours, H 2 O content 0.025%, scrap steel S content 0.0030%, nickel plate S content 0.0045%, copper block S content 0.007%, molybdenum iron S content 0.0098%;

[0091] Aluminum, ferrosilicon, manganese metal, and ferro-titanium alloy are all baked at 300°C for 1.0 hour, the moisture content is 0.025%, the S content of metal aluminum is 0.0090%, the content of ferrosilicon S is 0.0022%, the content of metal manganese S is 0.013%, and the content of titanium-iron alloy S 0.0033%;

[0092] Lime and synthetic slag should be used within 36 hours after preparation, and kept sealed throughout the whole process; the main components of lime are CaO content of 98%, H 2 O content 0.088%, S content 0.013%, and unavoida...

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Abstract

The invention belongs to the technical field of ferrous metallurgy, and particularly relates to an ultralow-phosphorus continuous casting steel billet, and a production method and an application thereof. The production method comprises the steps of molten iron pretreatment, a converter duplex dephosphorization and decarburization procedure, LF refining, RH vacuum refining and continuous casting, the converter duplex dephosphorization and decarburization procedure comprises dephosphorization converter smelting and decarburization converter smelting, and the lance position, the oxygen supply amount, the bottom blowing flow, the slag, the alkalinity and other parameters in the dephosphorization converter smelting process and the decarburization converter smelting process are limited. The content of impurities such as phosphorus, sulfur, nitrogen and hydrogen in the continuous casting steel billet prepared by the method is extremely low, the cleanliness of molten steel is improved, the prepared steel billet is stable in quality and high in purity, the center of the steel billet does not have the defects of looseness and the like, and the rephosphorization problem caused by single slag or double slag of a traditional converter in the prior art is solved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to an ultra-low phosphorus continuous casting billet and its production method and application. Background technique [0002] In recent years, ultra-large container ships have developed rapidly, and the maximum loading capacity has grown from 10,000TEU to 24,000TRU. In this process, large-thickness and high-strength crack-arrest steel plays an important role. This type of steel has excellent crack-arrest performance, which can prevent brittle fractures in hatch coamings, decks and other parts, and improve the carrying capacity and safety of container ships. [0003] At present, the highest level of crack arrest steel that has been commercially applied is 460MPa grade (EH47), the maximum thickness is 100mm, and the -10°C crack arrest toughness of the steel plate is required to be Kca≥8000N / mm 3 / 2 , put forward very high requirements on the low temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C7/00C21C7/064C21C7/068C21C7/10B22D11/18B22D11/22C21C1/02C21C5/28C21C5/35C22C33/06C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14C22C38/16
CPCC21C7/064C21C7/068C21C5/28C21C5/35C21C7/0006C21C1/02C21C7/10B22D11/18B22D11/225C22C33/06C22C38/02C22C38/04C22C38/08C22C38/16C22C38/12C22C38/14C22C38/06C21C2007/0093Y02P10/20
Inventor 麻晗赵家七
Owner ZHANGJIAGANG HONGCHANG STEEL PLATE CO LTD
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