WO2020169077A1 - 一种低成本耐候钢及其生产方法 - Google Patents
一种低成本耐候钢及其生产方法 Download PDFInfo
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- WO2020169077A1 WO2020169077A1 PCT/CN2020/076118 CN2020076118W WO2020169077A1 WO 2020169077 A1 WO2020169077 A1 WO 2020169077A1 CN 2020076118 W CN2020076118 W CN 2020076118W WO 2020169077 A1 WO2020169077 A1 WO 2020169077A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- 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
- B21B1/46—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 metal immediately subsequent to continuous casting
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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
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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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- 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
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
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- the invention belongs to the field of low-alloy steel manufacturing, and specifically relates to a weathering steel strip with short process flow, low production cost, low alloy cost and excellent surface quality and a production method thereof.
- Weathering steel has high strength, high toughness, weldability, fire resistance, wear resistance and other properties, and has high atmospheric corrosion resistance in a variety of climatic environments. It is a green and environmentally friendly steel material and is widely used Production of tanks, vehicles, construction, bridges, pipelines, machinery and other industries.
- the main process of producing weathering steel is: converter or electric furnace-refining-thick or thin slab continuous casting-heating furnace heating-rolling-coiling, the production process is long, resource consumption is large, and waste The waste water discharge is large and the production cost is high.
- Weathering steel contains a high content of Cu.
- the Cu element is prone to segregate in the grain boundary due to its low melting point, causing the steel plate to "hot embrittlement", which seriously affects the performance of the steel plate.
- Surface Quality due to the high content of P element in weathering steel, it is easy to cause continuous casting cracks during the continuous casting process, which affects the subsequent rolling and the final mechanical properties of the steel plate.
- Patent document CN101671797A discloses a high-phosphorus weathering steel cast-rolled strip with negative phosphorus segregation on the surface and a preparation method thereof. The strength is improved by adding 0.30-1.25wt% of Cr, and 0.12-0.65wt% of Ni is added to improve weathering resistance. Performance, the content of microalloying elements is higher, and the alloy cost is higher.
- Patent document CN104313491B discloses a weathering steel hot-rolled strip without P segregation and its manufacturing method. It adds 0.6-0.8wt% of Cr and trace B elements to improve strength, and adds 0.03-0.11wt% of Ni. Improve weather resistance and higher alloy cost.
- Patent document CN107881429A discloses a hot-rolled high-strength weathering steel and a manufacturing method thereof. The strength is improved by adding 0.09-0.11wt% of Ti element.
- Patent document CN107354391A discloses a weathering steel which is added with various microalloying elements, the Ti content is 0.06-0.79wt%, the Nb element is 0.035-0.052wt%, and the V element is 0.025-0.080wt%.
- the present invention provides a new low-cost weathering steel and its production method, which adopts thin strips Casting and rolling greatly shorten the production process; through the control of cooling temperature and cooling rate after strip rolling, the strength of weathering steel is improved on the basis of reducing alloy cost; through continuous casting temperature control and alloy content design guarantee Improve the surface quality and weather resistance of strip steel.
- the present invention discloses a low-cost weathering steel production method, which is carried out according to the following steps:
- the chemical composition of molten steel is: C ⁇ 0.03wt%, Si: 0.10-0.50wt%, Mn: 0.50-1.50wt%, P: 0.07-1.50wt%, N ⁇ 0.008wt%, S ⁇ 0.003wt%, Cu ⁇ 0.40 wt%, Cr ⁇ 0.45wt%, the rest is Fe and unavoidable impurities;
- the qualified molten steel is continuously cast into a casting belt with a thickness of 1.4-2.5mm through a pair of oppositely rotating casting rolls;
- the cast strip is hot-rolled into hot-rolled thin strip after one pass;
- the hot-rolled steel strip is cooled by aerosol and coiled into coils.
- the molten steel casting temperature is controlled at 1580°C-1650°C.
- the cast strip is hot rolled into a thin strip steel after only one pass.
- the reduction of the cast strip after hot rolling by the hot rolling mill is 10-70%.
- the temperature of the cast strip before entering the hot rolling mill is above 900°C.
- the cast strip is hot-rolled to form a hot-rolled thin strip with a thickness of 0.7-2.0 mm.
- the hot-rolled thin strip is cooled to 400-500°C through aerosol, and the cooling rate is 30-100°C/s.
- the microstructure of the strip steel is a uniform acicular ferrite structure.
- the present invention also discloses a low-cost weathering steel, which is produced using the aforementioned low-cost weathering steel production method.
- the yield strength of the hot-rolled thin strip steel is more than 345MPa
- the elongation is more than 23%
- the microstructure of the strip steel is a uniform acicular ferrite structure .
- the present invention also discloses a low-cost weathering steel
- the chemical composition of the steel includes: C ⁇ 0.03wt%, Si: 0.10-0.50wt%, Mn: 0.50-1.50wt%, P : 0.07-1.50wt%, N ⁇ 0.008wt%, S ⁇ 0.003wt%, Cu ⁇ 0.40wt%, Cr ⁇ 0.45wt%, the rest is Fe and unavoidable impurities.
- the features and beneficial technical effects of the present invention include at least:
- Figure 1 is the metallographic structure of the low-cost weathering steel according to the present invention.
- the chemical composition of molten steel is: C: 0.023wt%, Si: 0.20wt%, Mn: 1.20wt%, P: 0.075wt%, N: 0.005wt%, S: 0.002wt%, Cu: 0.30wt%, Cr: 0.40 wt%, the rest is Fe and unavoidable impurities.
- the qualified molten steel is continuously cast into a cast strip with a thickness of 2.1mm through a pair of oppositely rotating casting rolls, and the continuous casting temperature is 1620°C.
- the hot rolling reduction is 50%, and the temperature of the strip before entering the rolling mill is 980°C.
- the hot rolled steel strip is cooled to 420°C by aerosol at a cooling rate of 60°C/s, and then coiled into coils.
- the weathering steel strip obtained through the above steps has a thickness of 1.05 mm.
- the mechanical properties of the strip are tested, and the yield strength is 378 MPa and the elongation is 28%. After surface inspection, the surface of the strip is good and no cracks appear.
- the chemical composition of molten steel is: C: 0.021wt%, Si: 0.35wt%, Mn: 0.60wt%, P: 0.078wt%, N: 0.004wt%, S: 0.0025wt%, Cu: 0.35wt%, Cr: 0.30 wt%, the rest is Fe and unavoidable impurities.
- the qualified molten steel is continuously cast into a casting strip with a thickness of 1.8mm through a pair of oppositely rotating casting rolls, and the continuous casting temperature is 1640°C.
- the hot rolling reduction is 20%, and the temperature of the strip before entering the rolling mill is 1010°C.
- the hot rolled steel strip is cooled to 450°C by aerosol at a cooling rate of 45°C/s, and then coiled into coils.
- the weathering steel strip obtained through the above steps has a thickness of 1.44 mm.
- the mechanical properties of the strip are tested, and the yield strength is 367 MPa and the elongation is 26%. After surface inspection, the surface of the strip is good and no cracks appear.
- the chemical composition of molten steel is: C: 0.03wt%, Si: 0.40wt%, Mn: 0.80wt%, P: 0.085wt%, N: 0.003wt%, S: 0.0015wt%, Cu: 0.25wt%, Cr: 0.35 wt%, the rest is Fe and unavoidable impurities.
- the qualified molten steel is continuously cast into a casting strip with a thickness of 2.4mm through a pair of oppositely rotating casting rolls, and the continuous casting temperature is 1590°C.
- the hot rolling reduction is 45%, and the temperature of the strip before entering the rolling mill is 1150°C.
- the hot-rolled steel strip is cooled to 480°C by aerosol at a cooling rate of 30°C/s, and then coiled into coils.
- the weathering steel strip obtained through the above steps has a thickness of 1.32 mm, and the mechanical properties of the strip are tested.
- the yield strength is 392 MPa and the elongation is 25%. After surface inspection, the surface of the strip is good and no cracks appear.
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- Heat Treatment Of Sheet Steel (AREA)
Abstract
一种低成本耐候钢及其生产方法。该耐候钢的成分为:C≤0.03,Si 0.10‑0.50,Mn 0.50‑1.50,P 0.07‑1.50,N≤0.008,S≤0.003,Cu<0.40,Cr<0.45,其余为Fe和不可避免杂质。其生产方法包括如下步骤:冶炼,薄带连铸,将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为1.4‑2.5mm的铸带,钢水浇铸温度控制在1580‑1650℃;铸带在线热轧,铸带经过1道次热轧轧制成厚度为0.7‑2.0mm的热轧薄带,热轧压下量为10‑70%,铸带入热轧机的温度大于900℃;轧后冷却及卷取,热轧带钢通过气雾冷却至400‑500℃,获得均匀的针状铁素体组织,随后卷取成卷。该耐候钢的屈服强度在345MPa以上,延伸率在23%以上,该方法生产流程短、生产成本和合金成本低、热轧薄带钢表面质量及板形优异。
Description
本发明属于低合金钢制造领域,具体地涉及一种短流程、低生产成本、低合金成本、表面质量优异的耐候钢薄带及其生产方法。
耐候钢具有高强度、高韧性、可焊接、耐火、耐磨等性能,并且在多种气候环境中,具有高的耐大气腐蚀的性能,是一种绿色、环保的钢铁材料,被广泛应用于制作箱罐、车辆、建筑、桥梁、管线、机械等各行各业。
目前,生产耐候钢的主要流程为:转炉或者电炉——精炼——厚板坯或薄板坯连铸——加热炉加热——轧制——卷取,其生产流程长、资源消耗大、废弃废水排放量大、生产成本较高。耐候钢中含有较高的Cu含量,在铸坯加热以及后续的多道次轧制过程中,Cu元素由于熔点低,易于在晶界呈液态偏析,造成钢板“热脆”,严重影响钢板的表面质量。另外,由于耐候钢中含有较高的P元素,在连铸过程中容易造成连铸裂纹,影响后续的轧制以及钢板最终的力学性能。为了使得耐候钢具有较高的强度,很多钢厂在耐候钢成分设计时添加Nb、Ti、V等微合金元素,使得耐候钢的成本较高。因此,开展低成本、高质量的薄规格耐候钢及其生产技术研究具有重大的意义。
专利文献CN101671797A公开了一种表面负偏析磷的高磷耐候钢铸轧薄带及其制备方法,通过添加0.30-1.25wt%的Cr提高强度,并添加了0.12-0.65wt%的Ni元素提高耐候性能,其微合金元素含量较高,合金成本较高。专利文献CN104313491B公开了一种无P偏析的耐候钢热轧薄带及其制造方法,其添加了0.6-0.8wt%的Cr元素以及微量B元素提高强度,并添加0.03-0.11wt%的Ni元素提高耐候性能,合金成本亦较高。专利文献CN107881429A公开了一种热轧高强耐候钢及其制造方法,通过添加0.09-0.11wt%的Ti元素提高强度。专利文献CN107354391A公开了一种耐候钢,其添加了多种微合金元素,Ti含量为0.06-0.79wt%,Nb元素为0.035-0.052wt%,V元素为0.025-0.080wt%。
发明内容
针对现有的耐候钢易于出现连铸裂纹、表面质量差、合金成本高、生产流程长、生产成本高等问题,本发明提供了一种新型的低成本耐候钢及其生产方法,采用薄带连铸连轧,大幅度缩短了生产流程;通过带钢轧后冷却温度和冷却速率的控制,在降低合金成本的基础上,提高了耐候钢的强度;通过连铸温度控制以及合金含量的设计保证了带钢表面质量以及耐候性能。
为了实现上述目的,一方面,本发明公开了一种低成本耐候钢的生产方法,按照一下步骤进行:
(1)冶炼
钢水化学成分为:C≤0.03wt%,Si:0.10-0.50wt%,Mn:0.50-1.50wt%,P:0.07-1.50wtwt%,N≤0.008wt%,S≤0.003wt%,Cu<0.40wt%,Cr<0.45wt%,其余为Fe和不可避免杂质;
(2)薄带连铸
将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为1.4-2.5mm的铸带;
(3)铸带在线热轧
铸带经过1道次热轧轧制成热轧薄带钢;
(4)轧后冷却及卷取
热轧带钢通过气雾冷却并卷取成卷。
根据本发明的低成本耐候钢的生产方法,优选地,钢水浇铸温度控制在1580℃-1650℃。
根据本发明的低成本耐候钢的生产方法,优选地,铸带仅经过1道次热轧轧制成薄带钢。
根据本发明的低成本耐候钢的生产方法,优选地,铸带经过热轧机热轧的压下量为10-70%。
根据本发明的低成本耐候钢的生产方法,优选地,铸带进入热轧机前的温度在900℃以上。
根据本发明的低成本耐候钢的生产方法,优选地,铸带经过热轧形成 热轧薄带钢的厚度为0.7-2.0mm。
根据本发明的低成本耐候钢的生产方法,优选地,热轧薄带钢经过气雾冷却至400-500℃,冷却速率为30-100℃/s。
根据本发明的低成本耐候钢的生产方法,优选地,热轧薄带钢经过冷却后,带钢的微观组织为均匀的针状铁素体组织。
为了实现上述目的,另一方面,本发明还公开了一种低成本耐候钢,其使用前述的一种低成本耐候钢的生产方法进行生产。
根据本发明的一种低成本耐候钢的生产方法,优选地,热轧薄带钢的屈服强度在345MPa以上,延伸率在23%以上,带钢的微观组织为均匀的针状铁素体组织。
为了实现上述目的,又一方面,本发明还公开了一种低成本耐候钢,钢的化学成分包括:C≤0.03wt%,Si:0.10-0.50wt%,Mn:0.50-1.50wt%,P:0.07-1.50wtwt%,N≤0.008wt%,S≤0.003wt%,Cu<0.40wt%,Cr<0.45wt%,其余为Fe和不可避免杂质。
有益技术效果
与现有的技术相比,本发明的特点和有益的技术效果至少包括:
(1)控制了耐候钢中C含量的范围,从而控制薄带连铸过程中固态相变的转变过程,避免了连铸表面裂纹的产生;
(2)通过提高带钢热轧后的冷却速率,降低带钢的终冷温度,控制带钢最终组织,提高了耐候钢的强度;
(3)无需添加Nb、Ti、V等微合金,降低了耐候钢的合金成本;
(4)通过添加Mn元素,提高了连铸过程中奥氏体的稳定性,避免铸态裂纹的产生,同时也提高了耐候钢的强度;
(5)通过对P含量以及Cr含量的严格控制,保证了耐候钢耐候性能的同时,避免了连铸裂纹的产生;
(6)减少了传统热轧以及薄板坯连铸连轧的加热炉加热以及多道次热轧工序,降低了耐候钢的生产成本。
为了更清楚地说明本发明的实施例的技术方案,下面将对实施例的附图作简单的介绍。显而易见地,下面描述中的附图仅仅涉及本发明的一些实施例,而非对本发明的限制。
图1是根据本发明的低成本耐候钢的金相组织。
为了使本发明实施例的目的、技术方案和优点更加清楚,下面将对本发明实施例的技术方案进行清楚、完整地描述。显然,所描述的实施例是本发明的一部分实施例,而不是全部的实施例。基于所描述的本发明的实施例,本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例,都属于本发明保护的范围。
除非另作定义,本公开所使用的技术术语或科学术语应当为本发明所属领域内具有一般技能的人士所理解的通常意义。
实施例1
本实施例按照以下步骤进行:
(1)冶炼
钢水化学成分为:C:0.023wt%,Si:0.20wt%,Mn:1.20wt%,P:0.075wt%,N:0.005wt%,S:0.002wt%,Cu:0.30wt%,Cr:0.40wt%,其余为Fe和不可避免杂质。
(2)薄带连铸
将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为2.1mm的铸带,连铸温度为1620℃。
(3)铸带在线热轧
热轧压下量为50%,带钢入轧机前的温度为980℃。
(4)冷却及卷取
热轧带钢通过气雾冷却至420℃,冷却速率为60℃/s,随后卷取成卷。
经过以上步骤所得到的耐候钢薄带厚度为1.05mm,对薄带进行力学性能测试,屈服强度为378MPa,延伸率为28%。经过表面检查,带钢表面良好,未出现裂纹。
实施例2
本实施例按照以下步骤进行:
(1)冶炼
钢水化学成分为:C:0.021wt%,Si:0.35wt%,Mn:0.60wt%,P:0.078wt%,N:0.004wt%,S:0.0025wt%,Cu:0.35wt%,Cr:0.30wt%,其余为Fe和不可避免杂质。
(2)薄带连铸
将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为1.8mm的铸带,连铸温度为1640℃。
(3)铸带在线热轧
热轧压下量为20%,带钢入轧机前的温度为1010℃。
(4)冷却及卷取
热轧带钢通过气雾冷却至450℃,冷却速率为45℃/s,随后卷取成卷。
经过以上步骤所得到的耐候钢薄带厚度为1.44mm,对薄带进行力学性能测试,屈服强度为367MPa,延伸率为26%。经过表面检查,带钢表面良好,未出现裂纹。
实施例3
本实施例按照以下步骤进行:
(1)冶炼
钢水化学成分为:C:0.03wt%,Si:0.40wt%,Mn:0.80wt%,P:0.085wt%,N:0.003wt%,S:0.0015wt%,Cu:0.25wt%,Cr:0.35wt%,其余为Fe和不可避免杂质。
(2)薄带连铸
将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为2.4mm的铸带,连铸温度为1590℃。
(3)铸带在线热轧
热轧压下量为45%,带钢入轧机前的温度为1150℃。
(4)冷却及卷取
热轧带钢通过气雾冷却至480℃,冷却速率为30℃/s,随后卷取成卷。
经过以上步骤所得到的耐候钢薄带厚度为1.32mm,对薄带进行力学性能测试,屈服强度为392MPa,延伸率为25%。经过表面检查,带钢表面良好,未出现裂纹。
以上所述仅是本发明的示范性实施方式,而非用于限制本发明的保护范围,本发明的保护范围由所附的权利要求确定。
Claims (10)
- 一种低成本耐候钢的生产方法,其特征在于,生产方法包括如下步骤:(1)冶炼冶炼得到如下成分的钢水:C≤0.03wt%,Si:0.10-0.50wt%,Mn:0.50-1.50wt%,P:0.07-1.50wtwt%,N≤0.008wt%,S≤0.003wt%,Cu<0.40wt%,Cr<0.45wt%,其余为Fe和不可避免杂质;(2)薄带连铸将冶炼合格的钢水经过一对相向旋转的铸辊连铸成厚度为1.4-2.5mm的铸带;(3)铸带在线热轧铸带经过1道次热轧轧制成热轧薄带钢;(4)轧后冷却及卷取热轧带钢通过气雾冷却并卷取成卷。
- 如权利要求1所述的低成本耐候钢的生产方法,其特征在于,步骤2)中,钢水浇铸温度控制在1580℃-1650℃。
- 如权利要求1或权利要求2所述的低成本耐候钢的生产方法,其特征在于,步骤3)中,铸带仅经过1道次热轧轧制成薄带钢。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤3)中,铸带经过热轧机热轧的压下量为10-70%。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤3)中,铸带进入热轧机前的温度在900℃以上。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤3)中,铸带经过热轧形成热轧薄带钢的厚度为0.7-2.0mm。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤4)中,热轧薄带钢经过气雾冷却至400-500℃,冷却速率为30-100℃/s。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤4)中,热轧薄带钢经过冷却后,带钢的微观组织为均匀 的针状铁素体组织。
- 如前述权利要求中的任意一项所述的低成本耐候钢的生产方法,其特征在于,步骤4)中,热轧薄带钢的屈服强度在345MPa以上,延伸率在23%以上。
- 一种低成本耐候钢,其特征在于,钢的化学成分包括:C≤0.03wt%,Si:0.10-0.50wt%,Mn:0.50-1.50wt%,P:0.07-1.50wtwt%,N≤0.008wt%,S≤0.003wt%,Cu<0.40wt%,Cr<0.45wt%,其余为Fe和不可避免杂质。
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