CN116377327A - 一种经济型q390md钢板及其生产方法 - Google Patents
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 51
- 239000010959 steel Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000012535 impurity Substances 0.000 claims abstract description 3
- 229910052742 iron Inorganic materials 0.000 claims abstract description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 3
- 238000001816 cooling Methods 0.000 claims description 24
- 238000005096 rolling process Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 4
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 0.000 claims description 4
- 238000003303 reheating Methods 0.000 claims description 3
- 238000010008 shearing Methods 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052799 carbon Inorganic materials 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 claims description 2
- 238000002791 soaking Methods 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 238000003723 Smelting Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000009851 ferrous metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- 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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- 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
- C21—METALLURGY OF IRON
- C21D—MODIFYING 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
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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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
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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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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- 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
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
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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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
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Abstract
本发明公开了一种经济型Q390MD钢板及其生产方法,所述钢板按重量百分比包括如下组分:C:0.08~0.105%,Si≤0.25%,Mn:1.45~1.55%,Al:0.020~0.045%,Ti:0.01~0.02%,Nb:0.015~0.025%,P≤0.02%,S≤0.005%,N≤0.008%,其余为铁和不可避免的杂质。本发明生产出的经济型Q390MD钢板,既保证了产品的力学性能,又满足了较高的低温冲击要求,同时大大降低了生产成本,为其应用拓宽市场。
Description
技术领域
本发明属于钢铁冶金技术领域,具体涉及一种经济型Q390MD钢板及其生产方法。
背景技术
目前,Q390MD应用于生产建筑、桥梁建设的结构和机械零件等领域。随着我国钢结构建筑及桥梁基础设施建设的不断进行,Q390MD需求量日益增长,现已成为国内各大钢铁企业普遍批量生产的钢种之一。
Q390MD的需求不断增多,既要保证产品的力学性能,又要满足较高的低温冲击要求,为此生产过程中常常添加贵重元素如V、Cr、Cu、Ni等,导致制造成本高,应用范围有所限制。
发明内容
解决的技术问题:针对上述技术问题,本发明提供一种经济型Q390MD钢板及其生产方法,能有效解决上述Q390MD制造成本高导致应用范围受限等不足之处。
技术方案:第一方面,本发明提供一种经济型Q390MD钢板,按重量百分比包括如下组分:C:0.08~0.105%,Si≤0.25%,Mn:1.45~1.55%,Al:0.020~0.045%,Ti:0.01~0.02%, Nb:0.015~0.025%,P≤0.02%,S≤0.005%,N≤0.008%,其余为铁和不可避免的杂质。
优选的,所述钢板的厚度为10-60mm。
优选的,所述钢板的碳当量Ceq =[C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15]≤0.40%。
优选的,所述钢板的焊接裂纹敏感性指数Pcm=[C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B]≤0.20%。
优选的,所述钢板的屈服强度≥390MPa,抗拉强度490~650MPa,延伸率≥20%,-20℃夏比冲击功≥60J,机械性能满足GB/T 1591中Q390级别的钢板要求。
第二方面,本发明提供一种第一方面所述的钢板的生产方法,包括板坯再加热-粗轧-精轧-钢板快速冷却-钢板热矫-上冷床冷却-剪切-入库,其中:
(1)板坯再加热阶段:加热段温度为1180~1250℃,均热段温度为1150~1220℃,在炉时间不小于320min;
(2)轧制阶段,采用控轧控冷TMCP轧制工艺;
(3)钢板快速冷却后,上冷床冷却到80℃以下-剪切-入库。
优选的,轧制阶段的终轧温度为800~860℃。
优选的,采用控轧控冷TMCP轧制工艺的参数如下:
优选的,所述钢板上冷床自然冷却至80℃,冷却冷速为空冷冷速。
有益效果:本发明在不加入贵重金属元素的情况下,通过调整钢板成分和生产方法,生产出经济型Q390MD钢板,既保证了产品的力学性能,又满足了较高的低温冲击要求,同时大大降低了生产成本,为其应用拓宽市场。
附图说明
图1是实施例2中55mm的Q390MD钢板心部的组织图;
图2是实施例2中55mm的Q390MD钢板四分之一厚度处的组织图;
图3是实施例2中55mm的Q390MD钢板表面的组织图。
实施方式
下面结合附图和具体实施例对本发明作详细说明:
生产方法为:板坯再加热-粗轧-精轧-钢板快速冷却-钢板热矫-上冷床冷却-剪切-入库,不同实施例母板轧制工艺过程控制参数和工艺性能如下表1所示:
表1 不同实施例母板轧制工艺过程控制参数和工艺性能
不同实施例冶炼炉次熔炼成分如下表2所示:
表2不同实施例冶炼炉次熔炼成分
从表1-表2整体可知:本发明方法生产的Q390MD钢板,具有较优的合金成分经济性,同时能够保证钢板的强度和低温冲击韧性,有效的解决了制造成本高和应用范围受限等问题;图1-图3分别为实施例2生产的55mm厚的Q390MD钢板的心部、四分之一厚度处和表面的组织图,由图1-图3可知:钢板的最终组织以铁素体、珠光体和贝氏体组织为主。
以上所述仅为本发明的较佳实施例而已,并不用以限制本发明,凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等,均应包含在本发明的保护范围之内。
Claims (9)
1.一种经济型Q390MD钢板,其特征在于,按重量百分比包括如下组分:C:0.08~0.105%,Si≤0.25%,Mn:1.45~1.55%,Al:0.020~0.045%,Ti:0.01~0.02%, Nb:0.015~0.025%,P≤0.02%,S≤0.005%,N≤0.008%,其余为铁和不可避免的杂质。
2.根据权利要求1所述的一种经济型Q390MD钢板,其特征在于:所述钢板的厚度为10-60mm。
3.根据权利要求1所述的一种经济型Q390MD钢板,其特征在于:所述钢板的碳当量Ceq=[C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15]≤0.40%。
4.根据权利要求1所述的一种经济型Q390MD钢板,其特征在于:所述钢板的焊接裂纹敏感性指数Pcm=[C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/15+V/10+5B]≤0.20%。
5.根据权利要求1所述的一种经济型Q390MD钢板,其特征在于:所述钢板的屈服强度≥390MPa,抗拉强度490~650MPa,延伸率≥20%,-20℃夏比冲击功≥60J,机械性能满足GB/T1591中Q390级别的钢板要求。
6.一种权利要求1-5任一项所述的钢板的生产方法,其特征在于,包括板坯再加热-粗轧-精轧-钢板快速冷却-钢板热矫-上冷床冷却-剪切-入库,其中:
(1)板坯再加热阶段:加热段温度为1180~1250℃,均热段温度为1150~1220℃,在炉时间不小于320min;
(2)轧制阶段,采用控轧控冷TMCP轧制工艺;
(3)钢板快速冷却后,上冷床冷却到80℃以下-剪切-入库。
7.根据权利要求6所述的生产方法,其特征在于:轧制阶段的终轧温度为800~860℃。
9.根据权利要求6所述的生产方法,其特征在于:所述钢板上冷床自然冷却至80℃,冷却冷速为空冷冷速。
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KR20210092244A (ko) * | 2018-12-05 | 2021-07-23 | 난징 아이론 앤드 스틸 컴퍼니 리미티드 | Tmcp상태의 선박 voc 저장탱크용 저온 강판 및 제조방법 |
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CN113755759A (zh) * | 2021-09-10 | 2021-12-07 | 宝钢湛江钢铁有限公司 | 一种厚规格高韧性低合金高强结构钢及其生产方法 |
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