CN116121631A - 一种大规格铌微合金化轧后控冷hrb400e钢筋的生产方法 - Google Patents
一种大规格铌微合金化轧后控冷hrb400e钢筋的生产方法 Download PDFInfo
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- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 claims description 6
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- 229910000616 Ferromanganese Inorganic materials 0.000 claims description 4
- 229910001257 Nb alloy Inorganic materials 0.000 claims description 4
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 claims description 4
- 229910052748 manganese Inorganic materials 0.000 claims description 4
- 229910000720 Silicomanganese Inorganic materials 0.000 claims description 3
- -1 aluminum-silicon-titanium Chemical compound 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims 2
- 229910000628 Ferrovanadium Inorganic materials 0.000 abstract description 2
- PNXOJQQRXBVKEX-UHFFFAOYSA-N iron vanadium Chemical compound [V].[Fe] PNXOJQQRXBVKEX-UHFFFAOYSA-N 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000011572 manganese Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
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- 239000000956 alloy Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
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- 239000000203 mixture Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
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- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 229910001570 bauxite Inorganic materials 0.000 description 1
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- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- 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
- C22C33/06—Making ferrous alloys by melting using master alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/12—Accessories for subsequent treating or working cast stock in situ
- B22D11/1206—Accessories for subsequent treating or working cast stock in situ for plastic shaping of strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/20—Controlling or regulating processes or operations for removing cast stock
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- 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
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
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- 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
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
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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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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Abstract
本发明公开了一种大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,包括:冶炼,转炉终点钢水中C含量不少于0.06wt%,P含量不超过0.03wt%;出钢温度为1620~1644℃;精炼;连铸,过热度设置为25~35℃,拉速为2.2~2.4m/min;轧制,开轧温度为970~1000℃,精轧入口温度为940~960℃。本发明通过利用铌微合金化提高强度,相比采用钒铁微合金化达到了降低成本的目的,同时力学性能优异稳定。
Description
技术领域
本发明涉及冶金技术领域,尤其涉及一种大规格铌微合金化轧后控冷HRB400E钢筋的生产方法。
背景技术
HRB400E是《钢筋混凝土用钢》GB 1499.2—2018中规定的螺纹钢筋牌号,因标准成分范围较宽和生产厂家的生产设备、工艺控制等不同,各个厂家所生产的HRB400热轧带肋钢筋的成分各不相同,同时各个钢厂生产工艺也各不相同。现有的大规格(≥36mm)HRB400E钢筋的力学强度偏低,性能不稳定,为了提高钢筋的强度,降低生产成本,采用铌微合金化配合轧后控冷生产大规格HRB400E钢筋。
发明内容
为了解决上述技术问题,本发明的目的是提供一种大规格铌微合金化轧后控冷HRB400E钢筋的生产方法。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,包括:
冶炼,转炉终点钢水中C含量不少于0.06wt%,P含量不超过0.03wt%;出钢温度为1620~1644℃;
精炼;
连铸,过热度设置为25~35℃,拉速为2.2~2.4m/min;
轧制,开轧温度为970~1000℃,精轧入口温度为940~960℃。
2.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,所述冶炼过程中,加入硅铁、硅锰、无烟煤和铝硅钛中的一种或多种进行脱氧合金化;出钢过程对钢包进行底吹氩操作。
进一步的,所述精炼过程中,加入硅铁、中碳锰铁和锻烧无烟煤中一种或多种进行成分微调;精炼后期加入铌合金;软吹时间大于10min。
进一步的,所述轧制过程中,轧后控冷水箱开启一台水泵1350转/min,Φ36mm钢筋出控冷水箱温度为830~840℃。
进一步的,以质量百分比计,其化学成分为:C 0.22~0.25%,Si 0.40~0.50%,Mn 1.35~1.45%,Nb 0.03~0.05%,余量为Fe和不可避免的杂质,。
进一步的,所述杂质中的P≤0.045%,所述杂质中的S≤0.045%。
与现有技术相比,本发明的有益技术效果:
通过利用铌微合金化提高强度,相比采用钒铁微合金化达到了降低成本的目的。
本发明提供的HRB400E钢筋具有力学性能优异稳定,成本低的优点。
具体实施方式
一种大规格铌微合金化轧后控冷HRB400E钢筋,以质量百分比计,其化学成分为:C0.22~0.25%,Si 0.40~0.50%,Mn 1.35~1.45%,Nb 0.03~0.05%,余量为Fe和不可避免的杂质。所述杂质中的P≤0.045%,所述杂质中的S≤0.045%。
其生产方法包括:冶炼,转炉终点钢水中C含量不少于0.06wt%,P含量不超过0.03wt%;出钢温度为1620~1644℃;精炼;连铸,过热度设置为25~35℃,拉速为2.2~2.4m/min;轧制,开轧温度为970~1000℃,精轧入口温度为940~960℃。
所述冶炼过程中,加入硅铁、硅锰、无烟煤和铝硅钛中的一种或多种进行脱氧合金化;出钢过程对钢包进行底吹氩操作。
所述精炼过程中,加入硅铁、中碳锰铁和锻烧无烟煤中一种或多种进行成分微调;精炼后期加入铌合金;软吹时间大于10min。
所述轧制过程中,轧后控冷水箱开启一台水泵1350转/min,Φ36mm钢筋出控冷水箱温度为830~840℃。
Φ36mm钢筋出控冷水箱温度为830~840℃,更优选为835℃;轧后控冷水箱开启一台水泵1350转/min;
工业试生产了5炉钢,具体的工艺参数控制如下:
1、转炉冶炼
转炉冶炼时根据成分需求加入白灰,白云石,铁皮球,出钢过程中加入硅铁,硅锰。
转炉终点钢水的碳含量、磷含量(质量百分数)及出钢温度如表1所示。
表1转炉出钢的成分及温度
出钢温度,℃ | 出钢碳含量,wt% | 出钢磷含量,wt% | |
实施例1 | 1634 | 0.07 | 0.011 |
实施例2 | 1634 | 0.15 | 0.030 |
实施例3 | 1636 | 0.11 | 0.020 |
实施例4 | 1635 | 0.07 | 0.015 |
实施例5 | 1640 | 0.13 | 0.022 |
2、LF炉精炼
据钢水成分及温度变化进行加辅料造渣,加合金进行微调和升温操作。加入白灰500~600kg,铝矾土200~300kg,合金根据精炼就位成分进行微调加入锰铁50~80kg,硅铁100~300kg,铌合金75kg,精炼后喂入硅钙线,喂入量200~300m。
3、连铸生产
工艺参数列于表2;产品成分列于表3。
表2连铸工艺参数
过热度(℃) | 拉速(m/min) | |
实施例1 | 27 | 2.2 |
实施例2 | 34 | 2.6 |
实施例3 | 30 | 2.3 |
实施例4 | 28 | 2.3 |
实施例5 | 29 | 2.4 |
表3成品成分(wt%,余量为铁)
C | Si | Mn | Nb | P | S | |
实施例1 | 0.24 | 0.48 | 1.41 | 0.035 | 0.012 | 0.011 |
实施例2 | 0.25 | 0.46 | 1.44 | 0.036 | 0.030 | 0.022 |
实施例3 | 0.24 | 0.42 | 1.43 | 0.035 | 0.024 | 0.018 |
实施例4 | 0.24 | 0.49 | 1.43 | 0.035 | 0.014 | 0.018 |
实施例5 | 0.24 | 0.44 | 1.41 | 0.037 | 0.020 | 0.021 |
4、轧钢生产
生产尺寸分别为Φ36mm的钢筋;开轧温度为970~1000℃,精轧入口温度为940~960℃。轧后控冷水箱开启一台水泵1350转/min,Φ36mm钢筋出控冷水箱温度为830~840℃。
表4轧制工艺参数
对上述5个实施例制备的钢筋进行力学性能测试,测试结果列于表5:
表5力学性能测试
由表5可知,本发明生产的大规格HRB400E钢筋各项指标均满足标准要求,可以满足用户的使用需求。
以上所述的实施例仅是对本发明的优选方式进行描述,并非对本发明的范围进行限定,在不脱离本发明设计精神的前提下,本领域普通技术人员对本发明的技术方案做出的各种变形和改进,均应落入本发明权利要求书确定的保护范围内。
Claims (6)
1.一种大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,包括:
冶炼,转炉终点钢水中C含量不少于0.06wt%,P含量不超过0.03wt%;出钢温度为1620~1644℃;
精炼;
连铸,过热度设置为25~35℃,拉速为2.2~2.4m/min;
轧制,开轧温度为970~1000℃,精轧入口温度为940~960℃。
2.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,所述冶炼过程中,加入硅铁、硅锰、无烟煤和铝硅钛中的一种或多种进行脱氧合金化;出钢过程对钢包进行底吹氩操作。
3.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,所述精炼过程中,加入硅铁、中碳锰铁和锻烧无烟煤中一种或多种进行成分微调;精炼后期加入铌合金;软吹时间大于10min。
4.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,所述轧制过程中,轧后控冷水箱开启一台水泵1350转/min,Φ36mm钢筋出控冷水箱温度为830~840℃。
5.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,以质量百分比计,其化学成分为:C0.22~0.25%,Si0.40~0.50%,Mn1.35~1.45%,Nb0.03~0.05%,余量为Fe和不可避免的杂质。
6.根据权利要求1所述的大规格铌微合金化轧后控冷HRB400E钢筋的生产方法,其特征在于,所述杂质中的P≤0.045%,所述杂质中的S≤0.045%。
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