CN113278885A - 一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法 - Google Patents

一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法 Download PDF

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CN113278885A
CN113278885A CN202110495231.4A CN202110495231A CN113278885A CN 113278885 A CN113278885 A CN 113278885A CN 202110495231 A CN202110495231 A CN 202110495231A CN 113278885 A CN113278885 A CN 113278885A
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steel bar
storage tank
natural gas
gas storage
low
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曾四宝
张利武
闫栋
梁绪昌
赵长忠
杨凯峰
张洪来
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Shandong Shiheng Special Steel Group Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/36—Processes yielding slags of special composition
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006—Adding metallic additives
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

Abstract

一种液化天然气储罐用低温钢筋用坯冶炼工艺，所述钢筋用坯按重量百分比计，化学成分包括C、Si、Mn、P、S、Cr、Ni、Cu、V，其余为Fe和不可避免的杂质。本发明铁水不需要预处理，通过优化转炉双渣脱磷操作、转炉出钢脱氧操作、LF炉造渣制度、脱氧制度、铝含量控制、软吹制度、连铸保护浇注、电磁搅拌、超弱冷却制度，得到高纯净度、低缺陷的液化天然气储罐用低温钢筋用坯。

Description

一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法
技术领域
本发明涉及一种钢筋用坯冶炼工艺，尤其涉及一种液化天然气储罐用低温钢筋用坯冶炼工艺。
背景技术
铁水需要经过预处理，将铁水硫含量控制在0.005%以内，转炉双渣脱磷操作，转炉出钢采用滑板挡渣，该种生产工艺一方面导致生产成本的升高，另一方面增加了金属料的消耗。
发明内容
一种液化天然气储罐用低温钢筋用坯的生产工艺，依次包括转炉双渣脱磷操作、转炉挡渣锥挡渣、转炉出钢脱氧操作、LF炉造渣制度、脱氧制度、铝含量、软吹制度、连铸保护浇注、电磁搅拌、超弱冷却制度。
转炉出钢过程中加入高铝系精炼渣和钢芯铝，精炼炉使用铝粒和硅铁粉进行扩散脱氧，精炼炉造高碱度三元渣系（CaO-SiO2-Al2O3）精炼渣，吸附钢水中的夹杂物，精炼炉定氧小于5ppm时，确认Alt含量大于0.020%，否则使用钢芯铝补铝，然后进行喂钙线处理，最后通过延长软吹促使夹杂物上浮到炉渣中提高钢水纯净度。
连铸采用复式控流+塞棒自动控制，确保浇注过程中结晶器液面的稳定性；浇注过程采用保护浇注，防止钢水二次氧化；使用结晶器电磁搅拌促进夹杂物上浮、提高连铸坯的等轴晶率；浇注过程中采用超弱冷却制度，最终得到高纯净度、低缺陷的液化天然气储罐用低温钢筋用坯。
本发明的优点：
铁水不需要预处理，通过优化转炉双渣脱磷操作、转炉出钢脱氧操作、LF炉造渣制度、脱氧制度、铝含量、软吹制度、连铸保护浇注、电磁搅拌、超弱冷却制度，得到高纯净度、低缺陷的液化天然气储罐用低温钢筋用坯。
具体实施方式：
为了得到合格的液化天然气储罐用低温钢筋用坯，主要采取以下措施：
⑴转炉采用双渣操作，将终点碳控制在0.05%以内，终点磷控制在0.008%以内。
⑵转炉出钢使用挡渣锥挡渣，出钢口寿命控制在100炉左右，转炉出钢回磷量控制在0.003%以内转炉出钢过程中加入钢芯铝，确保精炼炉到站ALs含量在0.040%左右。
⑶为保证良好的精炼效果，优化精炼造渣工艺，精炼渣碱度控制在3.5～4.0之间，使用铝粒和硅铁粉进行脱氧操作，造三元渣系（CaO-SiO2-Al2O3），吸收加铝后生成的铝酸钙夹杂物。精炼炉出钢成分按下表控制：
成分 C Si Mn P S Cr Mo V Nb Ti
内控范围 0.06～0.15 0.15～0.45 0.60～0.80 ≤0.030 ≤0.010 0.30～0.45 0.20～0.30 0.020～0.040 0.010～0.030 0.010～0.030
⑷精炼炉用定氧仪测定钢中自由氧含量在5ppm后，确认钢水Alt含量大于0.020%，否则使用钢芯铝进行增铝操作。
⑸钢中铝含量合格后，通过喂钙线对钢水进行钙处理，控制钙铝比在0.08～0.10，促使夹杂物变性，生成低熔点的12CaO·7 Al2O3或者CaO·2 Al2O3。
⑹精炼炉采用自动吹氩技术控制钢包底吹流量，一方面促进夹杂物上浮，改善钢水流动性，避免水口结瘤。另一方面减少软吹阶段铝元素的二次氧化。
⑺连铸采用复式控流+塞棒自动控制，确保浇注过程中结晶器液面的稳定，避免出现结晶器卷渣的情况。
⑻连铸浇注过程中采用全保护浇注，防止浇注过程中钢水的二次氧化。
⑼浇注过程中采用结晶器电磁搅拌，进一步促进钢中夹杂物的上浮，提高连铸坯等轴晶率。
⑽连铸浇注过程中采用超弱冷却制度，改善铸坯低倍质量。
上面对本发明进行了示例性描述，显然本发明具体实现并不受上述方式的限制，只要采用了本发明的方法构思和技术方案进行的各种非实质性的改进，或未经改进将本发明的构思和技术方案直接应用于其它场合的，均在本发明的保护范围之内。

Claims (2)

1.一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法，其特征在于 ：所述钢筋用坯按重量百分比计，化学成分配比为:C：0.06-0.15％，Si：0.15-0.45％，Mn：0.60-0.80％，P：≤0.030％，S：≤0.01％，Cr:0.30-0.45％，V：0.020-0.040％,Mo：0.20-0.30％，Nb：0.010-0.030％,Ti：0.01-0.03％,其余为 Fe 和不可避免的杂质。
2.如权利要求1所述一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法,其特征在于 ：包括转炉双渣脱磷操作、转炉出钢脱氧操作、LF炉造渣制度、脱氧制度、铝含量、软吹制度、连铸保护浇注、电磁搅拌、超弱冷却制度。
CN202110495231.4A 2021-05-07 2021-05-07 一种液化天然气储罐用低温钢筋用坯冶炼工艺及其生产方法 Pending CN113278885A (zh)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114134413A (zh) * 2021-11-09 2022-03-04 石横特钢集团有限公司 一种hrb400fr耐火钢筋及其生产工艺

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Publication number Priority date Publication date Assignee Title
US20030217795A1 (en) * 2002-04-09 2003-11-27 Hitoshi Asahi High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same
WO2019069771A1 (ja) * 2017-10-03 2019-04-11 新日鐵住金株式会社 鋼板および鋼板の製造方法
CN110129675A (zh) * 2019-05-23 2019-08-16 江苏省沙钢钢铁研究院有限公司 高强钢筋及其生产方法
US20190316218A1 (en) * 2016-12-23 2019-10-17 Posco Steel material for welded steel pipe, having excellent longitudinal uniform elongation, manufacturing method therefor, and steel pipe using same
CN111876654A (zh) * 2020-07-01 2020-11-03 石横特钢集团有限公司 一种耐低温冲击d级电力角钢用坯的生产方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030217795A1 (en) * 2002-04-09 2003-11-27 Hitoshi Asahi High-strength steel sheet and high-strength steel pipe excellent in deformability and method for producing the same
US20190316218A1 (en) * 2016-12-23 2019-10-17 Posco Steel material for welded steel pipe, having excellent longitudinal uniform elongation, manufacturing method therefor, and steel pipe using same
WO2019069771A1 (ja) * 2017-10-03 2019-04-11 新日鐵住金株式会社 鋼板および鋼板の製造方法
CN110129675A (zh) * 2019-05-23 2019-08-16 江苏省沙钢钢铁研究院有限公司 高强钢筋及其生产方法
CN111876654A (zh) * 2020-07-01 2020-11-03 石横特钢集团有限公司 一种耐低温冲击d级电力角钢用坯的生产方法

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114134413A (zh) * 2021-11-09 2022-03-04 石横特钢集团有限公司 一种hrb400fr耐火钢筋及其生产工艺

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Application publication date: 20210820