WO2021212656A1 - 一种低温用高锰奥氏体钢快速合金化工艺 - Google Patents

一种低温用高锰奥氏体钢快速合金化工艺 Download PDF

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Publication number
WO2021212656A1
WO2021212656A1 PCT/CN2020/098814 CN2020098814W WO2021212656A1 WO 2021212656 A1 WO2021212656 A1 WO 2021212656A1 CN 2020098814 W CN2020098814 W CN 2020098814W WO 2021212656 A1 WO2021212656 A1 WO 2021212656A1
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ladle
alloying
manganese
steel
tapping
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PCT/CN2020/098814
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English (en)
French (fr)
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曹余良
周桂成
袁广鹏
吴国平
贾攀
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南京钢铁股份有限公司
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Priority to KR1020227036492A priority Critical patent/KR102581522B1/ko
Priority to AU2020443584A priority patent/AU2020443584B2/en
Publication of WO2021212656A1 publication Critical patent/WO2021212656A1/zh

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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28Manufacture of steel in the converter
    • C21C5/30Regulating or controlling the blowing
    • C21C5/34Blowing through the bath
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/072Treatment with gases
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27FURNACES; KILNS; OVENS; RETORTS
    • F27BFURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B7/00Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20Details, accessories, or equipment peculiar to rotary-drum furnaces
    • F27B7/22Rotary drums; Supports therefor
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D2211/00Microstructure comprising significant phases
    • C21D2211/001Austenite
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Definitions

  • the invention relates to a fast alloying process of high-manganese austenitic steel for low temperature.
  • High-manganese austenitic steel for low temperature use (15% ⁇ [Mn] ⁇ 30%), due to the high manganese content of molten steel and easy oxidation of manganese, it cannot be added to the converter together with the scrap steel.
  • Manganese can only be carried out through the converter tapping and LF refining process
  • the alloying of manganese leads to long manganese alloying time (more than 8 hours), low production efficiency, which is not conducive to continuous casting production; and long-term LF furnace alloying is likely to cause high content of molten steel hydrogen and nitrogen gas, which will affect the quality of continuous casting billets. Have a greater impact.
  • the technical problem to be solved by the present invention is to provide a rapid alloying process for high manganese austenitic steel at low temperature in view of the shortcomings of the above prior art, reducing the manganese alloying time of high manganese austenitic steel from 8 hours to Within 3 hours, the production efficiency and the quality of molten steel were improved, and the rapid alloying of high-manganese austenitic steel for low temperature was realized.
  • the technical solution of the present invention to solve the above technical problems is: a rapid alloying process of high manganese austenitic steel for low temperature, including manganese alloy baking ⁇ converter tapping and tapping alloying ⁇ LF slag alloying, specifically:
  • the grid plate is welded into a support with the same diameter as the bottom of the ladle, and the support is put into the bottom of the ladle; then the manganese alloy that needs to be baked is added to the ladle, and the amount of manganese alloy added is 230-260Kg/ t steel, and the addition amount does not exceed three-quarters of the volume of the ladle;
  • the tapping amount the weight of the standard ladle holding steel-the weight of the baked manganese alloy -1/3*The weight of the standard ladle containing steel, the converter tapping temperature is 1660°C-1700°C, and the tapping time is 3-5min;
  • LF refining furnace electrode heating and heating, stirring and desulfurization under 400-500NL/min large argon gas, large argon gas stirring and heating, heating and alloying, raising the temperature of molten steel to 1580°C-1600°C, and the heating time is more than 60 minutes;
  • the present invention further defines the scheme:
  • the ladle age of the aforementioned prepared ladle is before one third of the total ladle age.
  • a layer of lime for steelmaking is added on the manganese alloy.
  • the amount of lime added is 8-10Kg/t steel.
  • the baked alloy steel ladle is hoisted to the tapping station of the converter, and the bottom blowing of the ladle is turned on, and the flow rate of the bottom blowing of the ladle is 600-800 Nl/min.
  • the aforementioned lime is added in batches during the cooling process of large argon gas to accelerate the cooling, each batch of lime is added 1.5Kg/t, and the total amount added in the cooling process is not more than 6Kg/t.
  • the present invention carries out the process control of suitable alloy amount, suitable baking temperature, baking time and baking batch in advance through the steel ladle, and at the same time optimizing the converter steel tapping temperature and LF alloying process, greatly shortening LF refining furnace alloying time.
  • the LF refining furnace alloying time is shortened from 9 hours to 3 hours, which reduces the probability of increasing the molten steel gas content caused by the long-term heating of the LF refining furnace for alloying, which not only ensures continuous production, but also improves product quality .
  • 150t converter, 150t LF refining furnace smelting, 25Mn steel grade are selected, and a high-manganese austenitic steel rapid alloying process for low temperature is provided, including manganese alloy baking ⁇ converter tapping and tapping alloying ⁇ LF
  • the process flow of slag alloying is as follows:
  • Ladle preparation The total ladle age is 100 furnaces, and the No. 23 ladle with the ladle age of 19 furnaces is selected as the alloy baking ladle;
  • the electrodes of LF refining furnace are heated and sampled. For details, see Table 1. Large argon gas is stirred for desulfurization, the bottom blowing of the ladle is turned on, the argon flow rate is 500 NL/min, the large argon gas is stirred and heated for alloying for 77 minutes, and the molten steel temperature is 1593°C;
  • the present invention can also have other embodiments. All technical solutions formed by equivalent replacements or equivalent transformations fall within the protection scope of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

一种低温用高锰奥氏体钢快速合金化工艺,包括锰合金烘烤→转炉出钢和出钢合金化→LF化渣合金化,具体为:(1)准备钢包包龄在前期的钢包;(2)准备钢包支撑件,并将需要烘烤的锰合金运至钢包内;(3)钢包合金烘烤;(4)转炉出钢量及出钢温度控制;(5)LF精炼炉升温合金化过程;(6)LF精炼炉大氩气搅拌降温合金化过程;所述合金化工艺将高锰奥氏体钢锰合金化时间由8小时降低至3小时以内,提高生产效率及钢水质量。

Description

一种低温用高锰奥氏体钢快速合金化工艺 技术领域
本发明涉及一种低温用高锰奥氏体钢快速合金化工艺。
背景技术
低温用高锰奥氏体钢(15%≤[Mn]≤30%),由于钢水锰含量高,且锰易氧化,不能随废钢一起加入转炉,只能通过转炉出钢和LF精炼过程进行锰的合金化,导致锰合金化时间长(8小时以上),生产效率低,不利于连铸生产;且长时间的LF炉合金化又容易造成钢水氢、氮气体含量高,对连铸坯质量有较大影响。为了提高高锰奥氏体钢(15%≤[Mn]≤30%)生产效率,提升连铸坯质量,开发一种转炉冶炼生产低温高锰奥氏体钢快速合金化炼钢工艺,是急需解决的一个问题。
发明内容
本发明所要解决的技术问题是,针对以上现有技术存在的缺点,提供一种低温用高锰奥氏体钢快速合金化工艺,将高锰奥氏体钢锰合金化时间由8小时降低至3小时以内,提高生产效率及钢水质量,实现了低温用高锰奥氏体钢快速合金化。
本发明解决以上技术问题的技术方案是:一种低温用高锰奥氏体钢快速合金化工艺,包括锰合金烘烤→转炉出钢和出钢合金化→LF化渣合金化,具体为:
(一):锰合金烘烤:
(1)准备钢包包龄在前期的钢包;
(2)采用格栅板焊接成与钢包底直径大小相同的支撑件,将制作的支撑件放入钢包底部;然后加入需要烘烤的锰合金至钢包内,该锰合金加入量230-260Kg/t钢,且加入量不超过钢包容积的四分之三;
(3)将准备好的装有锰合金的钢包,放置到正常上线钢包烘烤工位开始烘烤,烘烤火焰温度调整至1000℃,烘烤时间24小时以上;
(二):转炉出钢和出钢合金化:
(1)将烘烤好的合金钢包吊运至转炉出钢工位,接通钢包底吹,打开钢包底吹进行出钢,其出钢量=标准钢包盛钢重量-烘烤锰合金的重量-1/3*标准钢包盛钢重量,转炉出钢温度1660℃-1700℃,出钢时间为3-5min;
(三):LF化渣合金化:
(1)LF精炼炉升温合金化过程:
LF精炼炉电极加热升温,在流量为400-500NL/min大氩气下搅拌脱硫,大氩气搅拌加热升温合金化,将钢水温度提升至1580℃-1600℃,升温时间为60分钟以上;
(2)LF精炼炉大氩气搅拌降温合金化过程:
当钢水温度升至1580℃-1600℃后,停止升温操作,调整钢包底吹氩气流量至600NL/min,落下LF精炼炉钢包小炉盖,进行大氩气搅拌降温操作,钢水温度降低至1480℃后,合金化工作完成,停止大氩气搅拌,调整钢包底吹氩气流量至50-80NL/min继续搅拌15分钟,吊至连铸工位进行浇铸作业,在大氩气搅拌降温过程中取样测温,根据取样分析钢水中成分情况,若小于钢种要求成分范围,则加入合金进行钢水成分微调,逐步将钢水成分调整至钢种要求的成分范围内。
本发明进一步限定方案:
前述的准备钢包的包龄在总包龄三分之一之前。
前述的在锰合金加入钢包后,在锰合金上面加入一层炼钢用石灰,石灰加入量8-10Kg/t钢。
前述的将烘烤好的合金钢包吊运至转炉出钢工位,接通钢包底吹,钢包底吹流量600-800Nl/min。
前述的在大氩气搅拌降温过程中分批次加入石灰加速降温,每批次石灰加入1.5Kg/t,降温过程总加入量不大于6Kg/t。
本发明的有益效果是:本发明通钢包提前进行合适合金量、适当烘烤温度、烘烤时间和烘烤批次的工艺控制,同时优化转炉出钢温度及LF合金化工艺,大大缩短了LF精炼炉合金化时间,LF精炼炉合金化时间由9小时缩短至3小时,降低了由于LF精炼炉长时间升温化合金导致的钢水气体含量增加概率,既保证连续生产,又提高了产品质量。
具体实施方式
实施例1
本实施例选择150t转炉、150吨LF精炼炉冶炼、25Mn钢种,提供一种低温用高锰奥氏体钢快速合金化工艺,包括锰合金烘烤→转炉出钢和出钢合金化→LF化渣合金化工艺流程,具体为:
(一):锰合金烘烤:
(1)钢包准备:钢包总包龄为100炉,选择包龄为19炉的23号钢包作为合金烘烤钢包;
(2)选用直径10mm的普通钢筋焊接制作成钢包底部直径大小的支撑件2块,将制作的支撑件放入钢包底部;加入金属锰合金35吨,然后向钢包内加入炼钢用石灰1.5吨,防止钢包内靠上层的锰合金被火焰烘烤软化;
(3)将准备好的装有金属锰和石灰的钢包,吊放置到正常上线钢包烘烤工位开始烘烤,烘烤火焰温度调整至1000℃,进行烘烤,合金烘烤时间27小时;
(二):转炉出钢和出钢合金化
(1)将烘烤27小时装有金属锰的钢包,吊运至转炉出钢工位,烘烤好的合金温度为708℃,接通钢包底吹,钢包底吹流量800Nl/min,打开钢包底吹进行出钢,其出钢量=150吨-35吨-1/3*150吨=100吨,转炉出钢温度1668℃,出钢时间为3min;
(三):LF化渣合金化
(1)LF精炼炉升温合金化过程:
LF精炼炉电极加热升温并取样,具体见表1,大氩气搅拌脱硫,接通钢包底吹,氩气流量500NL/min,大氩气搅拌加热升温合金化77分钟,钢水温度1593℃;
(2)LF精炼炉大氩气搅拌降温合金化过程:
钢水温度升至1583℃后,停止升温操作,调整钢包底吹氩气流量至600NL/min,落下LF精炼炉钢包小炉盖,能够隔绝空气,防止二次氧化,进行氩气大搅拌降温操作,大氩气搅拌降温过程,分2批次加入石灰加速降温,每批次石灰加入1.5Kg/t,使钢水温度降低至1487℃后,用时为65分钟,合金化工作完成,停止大氩气搅拌,调整钢包底吹氩气流量至50NL/min继续搅拌15分钟,吊至连铸工位进行浇铸,在大氩气搅拌降温过程取样测温,具体见表1。
表1:LF化渣合金化过程温度及锰成分
Figure PCTCN2020098814-appb-000001
本实施例25Mn生产,加入烘烤合金35吨,烘烤时间27小时,烘烤后温度708℃;LF精炼炉升温锰合金化过程时间77分钟,温度升至1583℃,升温结束钢水锰含量23.04%;LF精炼炉大氩气搅拌降温锰合金化过程时间65分钟,温度降低至1587℃,降温结束钢水锰含量23.41%,满足钢种成分要求,LF炉合金化总时间控制142分钟,大大提高了生产效率。
除上述实施例外,本发明还可以有其他实施方式。凡采用等同替换或等效变换形成的技术方案,均落在本发明要求的保护范围。

Claims (5)

  1. 一种低温用高锰奥氏体钢快速合金化工艺,包括锰合金烘烤→转炉出钢和出钢合金化→LF化渣合金化,其特征在于:具体为:
    (一):锰合金烘烤:
    (1)准备钢包包龄在前期的钢包;
    (2)采用格栅板焊接成与钢包底直径大小相同的支撑件,将制作的支撑件放入钢包底部;然后加入需要烘烤的锰合金至钢包内,该锰合金加入量230-260Kg/t钢,且加入量不超过钢包容积的四分之三;
    (3)将准备好的装有锰合金的钢包,放置到正常上线钢包烘烤工位开始烘烤,烘烤火焰温度调整至1000℃,烘烤时间24小时以上;
    (二):转炉出钢和出钢合金化:
    (1)将烘烤好的合金钢包吊运至转炉出钢工位,接通钢包底吹,打开钢包底吹进行出钢,其出钢量=标准钢包盛钢重量-烘烤锰合金的重量-1/3*标准钢包盛钢重量,转炉出钢温度1660℃-1700℃,出钢时间为3-5min;
    (三):LF化渣合金化:
    (1)LF精炼炉升温合金化过程:
    LF精炼炉电极加热升温,在流量为400-500NL/min大氩气下搅拌脱硫,大氩气搅拌加热升温合金化,将钢水温度提升至1580℃-1600℃,升温时间为60分钟以上;
    (2)LF精炼炉大氩气搅拌降温合金化过程:
    当钢水温度升至1580℃-1600℃后,停止升温操作,调整钢包底吹氩气流量至600NL/min,落下LF精炼炉钢包小炉盖,进行大氩气搅拌降温操作,钢水温度降低至1480℃后,合金化工作完成,停止大氩气搅拌,调整钢包底吹氩气流量至50-80NL/min继续搅拌15分钟,吊至连铸工位进行浇铸作业,在大氩气搅拌降温过程中取样测温,根据取样分析钢水中成分情况,若小于钢种要求成分范围,则加入合金进行钢水成分微调,逐步将钢水成分调整至钢种要求的成分范围内。
  2. 根据权利要求1所述的低温用高锰奥氏体钢快速合金化工艺,其特征在于:准备钢包的包龄在总包龄三分之一之前。
  3. 根据权利要求1所述的低温用高锰奥氏体钢快速合金化工艺,其特征在于:在锰合金加入钢包后,在锰合金上面加入一层炼钢用石灰,石灰加入量8-10Kg/t钢。
  4. 根据权利要求1所述的低温用高锰奥氏体钢快速合金化工艺,其特征在于:将烘烤好的合金钢包吊运至转炉出钢工位,接通钢包底吹,钢包底吹流量600-800Nl/min。
  5. 根据权利要求1所述的低温用高锰奥氏体钢快速合金化工艺,其特征在于:在大氩气搅拌降温过程中分批次加入石灰加速降温,每批次石灰加入1.5Kg/t,降温过程总加入量不大于6Kg/t。
PCT/CN2020/098814 2020-04-24 2020-06-29 一种低温用高锰奥氏体钢快速合金化工艺 WO2021212656A1 (zh)

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