CN115612925B - 一种稀土钇处理345MPa级低成本耐火热轧钢板及其制备方法 - Google Patents
一种稀土钇处理345MPa级低成本耐火热轧钢板及其制备方法 Download PDFInfo
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- 229910052727 yttrium Inorganic materials 0.000 title claims abstract description 19
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- 238000003723 Smelting Methods 0.000 claims description 9
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- MTRJKZUDDJZTLA-UHFFFAOYSA-N iron yttrium Chemical compound [Fe].[Y] MTRJKZUDDJZTLA-UHFFFAOYSA-N 0.000 claims description 6
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- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
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- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
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- C—CHEMISTRY; METALLURGY
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
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- C—CHEMISTRY; METALLURGY
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
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- C22C—ALLOYS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
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- C—CHEMISTRY; METALLURGY
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
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- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/02—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling heavy work, e.g. ingots, slabs, blooms, or billets, in which the cross-sectional form is unimportant ; Rolling combined with forging or pressing
- B21B2001/028—Slabs
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Abstract
本发明公开了一种稀土钇处理345MPa级低成本耐火热轧钢板,钢板的化学成分按重量百分比为C:0.04‑0.08%、Si:0.20‑0.45%、Mn:0.65‑0.9%、P:≤0.020%、S:≤0.015%、Nb:0.05‑0.07%、T i:0.025‑0.040%、Cr:0.20‑0.40%、Mo:0.15~0.25%、V:0.03‑0.05%、Y:0.0020‑0.0080%、余量为Fe和不可避免的杂质。还公布了其制备方法。本发明采用稀土钇处理低Mo元素添加的多元微合金化的方案,并配以适当的工艺,开发出耐火Q345MPa级耐火结构用钢板,大幅降低耐火结构用钢的制造成本。
Description
技术领域
本发明涉及一种稀土钇处理345MPa级低成本耐火热轧钢板及其制备方法。
背景技术
有耐火要求的钢结构,传统耐火措施是采用钢结构表面喷涂耐火涂层来达到耐火要求。而耐火涂层费用高、费工费时、污染环境、危害健康,后期扔需要检查维护,对老化损耗部位需进行补喷维护。而采用耐火钢可以减少或者取代防火涂层,精简作业工序,增加钢结构使用空间,可以达到降本增效的目的,同时提高环保性,而且钢结构可以100%循环回收再利用,是现代建筑用钢发展必然方向。
专利:CN IO6282800 A一种屈服345MPa级耐火钢板及其生产方法,公开了一种屈服345MPa级耐火钢板及其生产方法,其包括加热、轧制和回火工序;所述轧制工序采用再结晶区+未再结晶区两阶段控轧工艺。采用TMCP十回火工艺得到贝氏体、铁素体的复合组织。所述钢板化学成分的重量百分含量为:C0.10-0.12%,Si 0.20-0.40%,Mn 1.43-1.53%,P≤0.008%,S≤0.003%,Mo0.15-0.25%,Nb 0.020-0.030%,Al 0.020-0.050%,V 0.020-0.030%,余量为Fe和不可避免的杂质。本发明钢板的化学成分设计方案与前述发明明显不同,本发明采用稀土钇添加来提高钢板的耐火性能,本发明的C、Mn含量更低,钢板焊接性更好,钢板Mn偏析问题显著下降。上述发明与本发明的轧制热处理工艺也明显不同,本发明采用TMCP工艺直接获得钢板,无需附加回火工艺,工艺成本更低。本发明的低温冲击韧性也更为优秀。
专利:CN 109680215 A公布了一种耐火钢及其制备方法,主要技术方案,成分:碳0.05-0.2%,硅0-1.0%,锰0-2.0%,铝0.01%-0.04%,硫0-0.005%,磷0-0.015%,稀土为50ppm-500ppm,稀土包括镧、铈中的一种或两种,余量为铁和不可避免的杂质。对钢水进行连铸连轧或铸轧成型处理,得到耐火钢。本发明钢板的化学成分设计方案与前述发明明显不同,本发明采用稀土钇添加来提高钢板的耐火性能,同时采用少量的Mo、Nb、V、Ti复合微合金化成分设计方案。并且本发明提供了明确的轧制和冷却工艺。
专利:CN108486495 B公开了一种用于钢结构建筑的高强度耐火钢及其制备方法。成分设计为:C≤0.20%、Mo:0.15-0.20%、Nb:0.01-0.06%、Ti:0.01-0.10%和V:0~0.06%。制备方法采用两阶段热轧和一阶段温轧的方式轧制。本发明钢板的化学成分设计方案与前述发明明显不同,本发明采用稀土钇添加来提高钢板的耐火性能,同时采用少量的Mo、Nb、V、Ti复合微合金化成分设计方案。前述发明的轧制和冷却工艺复杂,实际生产比较困难。本发明采用的工艺与前述发明完全不相同,采用两阶段轧制工艺,轧后驰豫冷却工艺,工艺简单在现有产线上即可实现。
发明内容
本发明的目的是提供一种稀土钇处理345MPa级低成本耐火热轧钢板及其制备方法,采用稀土钇处理低Mo元素添加的多元微合金化的方案,并配以适当的工艺,开发出耐火Q345MPa级耐火结构用钢板,大幅降低耐火结构用钢的制造成本。
为解决上述技术问题,本发明采用如下技术方案:
本发明一种稀土钇处理345MPa级低成本耐火热轧钢板,钢板的化学成分按重量百分比为C:0.04-0.08%、Si:0.20-0.45%、Mn:0.65-0.9%、P:≤0.020%、S:≤0.015%、Nb:0.05-0.07%、Ti:0.025-0.040%、Cr:0.20-0.40%、Mo:0.15~0.25%、V:0.03-0.05%、Y:0.0020-0.0080%、余量为Fe和不可避免的杂质。
进一步的,钢板的化学成分按重量百分比为C:0.046%、Si:0.42%、Mn:0.89%、P:0.012%、S:0.004%、Nb:0.047%、Ti:0.038%、Cr:0.39%、Mo:0.23%、V:0.06%、Y:0.0027%、余量为Fe和不可避免的杂质。
进一步的,钢板的化学成分按重量百分比为C:0.062%、Si:0.34%、Mn:0.75%、P:0.012%、S:0.003%、Nb:0.038%、Ti:0.029%、Cr:0.33%、Mo:0.17%、V:0.03%、Y:0.0055%、余量为Fe和不可避免的杂质。
进一步的,钢板的化学成分按重量百分比为C:0.077%、Si:0.26%、Mn:0.66%、P:0.011%、S:0.005%、Nb:0.034%、Ti:0.025%、Cr:0.20%、Mo:0.15%、V:0.03%、Y:0.0077%、余量为Fe和不可避免的杂质。
一种稀土钇处理345MPa级低成本耐火热轧钢板的制备方法,其特征在于:包括如下步骤:
1)、冶炼和浇铸
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1620℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min;
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量;
2)、加热和轧制
板坯加热温度1150-1250℃,在炉时间160~250min;热轧采用两阶段控制轧制,粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%;奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为940-1050℃,终轧温度830-850℃,轧后冷却到570-640℃。
与现有技术相比,本发明的有益技术效果:
采用稀土钇处理低Mo元素添加的多元微合金化的方案,并配以适当的工艺,获得耐火Q345MPa级耐火结构用钢板,大幅降低耐火结构用钢的制造成本,从而促进耐火结构用钢的推广和应用。
附图说明
下面结合附图说明对本发明作进一步说明。
图1为实施例金相组织。
具体实施方式
本发明旨在提供一种稀土钇处理345MPa级低成本耐火热轧钢板及其制备方法,采用稀土钇处理低Mo元素添加的多元微合金化的方案,并配以适当的工艺,获得低制造成本的耐火Q345MPa级耐火结构用钢板。
其中生产方法具体包括以下步骤:
1、冶炼和浇铸
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1620℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min。
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量。
2、加热和轧制
板坯加热温度1150-1250℃,在炉时间160~250min。热轧采用两阶段控制轧制,粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%,奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为940-1050℃,终轧温度830-850℃,轧后冷却到570-640℃。
下面结合具体实施例对本发明作进一步的说明。
实施例1
钢板的化学成分、性能和组织分别见表1、表2和图1。
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1620℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min,软吹期间保持钢包渣面平静,钢水液面不得裸露在空气中。
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量。
板坯加热温度1180℃,在炉时间198min。热轧采用两阶段控制轧制。粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%。奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为955℃,终轧温度835℃,轧后驰豫15s后冷却到578℃。
实施例2
钢板的化学成分、性能和组织分别见表1、表2和图1。
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1600℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min,软吹期间保持钢包渣面平静,钢水液面不得裸露在空气中。
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量。
板坯加热温度1200℃,在炉时间203min。热轧采用两阶段控制轧制。粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%。奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为1010℃,终轧温度842℃,轧后冷却到615℃。
实施例3
钢板的化学成分、性能和组织分别见表1、表2和图1。
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1600℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min,软吹期间保持钢包渣面平静,钢水液面不得裸露在空气中。
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量。
板坯加热温度1200℃,在炉时间203min。热轧采用两阶段控制轧制。粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%。奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为1040℃,终轧温度848℃,轧后冷却到632℃。
表1:钢板化学成分(wt%)
表2:钢板性能
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 (4)
1.一种稀土钇处理345MPa级低成本耐火热轧钢板,其特征在于:钢板的化学成分按重量百分比为C:0.04-0.08%、Si:0.20-0.45%、Mn:0.65-0.9%、P:≤0.020%、S:≤0.015%、Nb:0.05-0.07%、Ti:0.025-0.040%、Cr:0.20-0.40%、Mo:0.15-0.25%、V:0.03-0.05%、Y:0.0020-0.0080%、余量为Fe和不可避免的杂质;
其制备方法包括如下步骤:
1)、冶炼和浇铸
冶炼用铁水采用脱硫预处理后送入LF精炼炉进行精炼,保证钢水成份、温度≥1620℃,RH真空处理,保证真空度,真空处理时间≥20min,真空处理15min时添加稀土钇铁合金,软吹时间≥10min;
铸坯全程采用保护浇注,恒拉速控制,并且采用电磁搅拌及轻压下保证铸坯质量;
2)、加热和轧制
板坯加热温度1150-1250℃,在炉时间160-250min;热轧采用两阶段控制轧制,粗轧累积压下率≥60%,单道次压下率≥10%,精轧累积压下率≥64%,单道次压下率≥12%;奥氏体再结晶区轧制开轧温度≥1100℃,奥氏体未再结晶区轧制开轧温度为940-1050℃,终轧温度830-850℃,轧后冷却到570-640℃。
2.根据权利要求1所述的稀土钇处理345MPa级低成本耐火热轧钢板,其特征在于:钢板的化学成分按重量百分比为C:0.046%、Si:0.42%、Mn:0.89%、P:0.012%、S:0.004%、Nb:0.047%、Ti:0.038%、Cr:0.39%、Mo:0.23%、V:0.06%、Y:0.0027%、余量为Fe和不可避免的杂质。
3.根据权利要求1所述的稀土钇处理345MPa级低成本耐火热轧钢板,其特征在于:钢板的化学成分按重量百分比为C:0.062%、Si:0.34%、Mn:0.75%、P:0.012%、S:0.003%、Nb:0.038%、Ti:0.029%、Cr:0.33%、Mo:0.17%、V:0.03%、Y:0.0055%、余量为Fe和不可避免的杂质。
4.根据权利要求1所述的稀土钇处理345MPa级低成本耐火热轧钢板,其特征在于:钢板的化学成分按重量百分比为C:0.077%、Si:0.26%、Mn:0.66%、P:0.011%、S:0.005%、Nb:0.034%、Ti:0.025%、Cr:0.20%、Mo:0.15%、V:0.03%、Y:0.0077%、余量为Fe和不可避免的杂质。
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