WO2020169075A1 - High-strength weather-proof thin steel strip and production method therefor - Google Patents

High-strength weather-proof thin steel strip and production method therefor Download PDF

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WO2020169075A1
WO2020169075A1 PCT/CN2020/076116 CN2020076116W WO2020169075A1 WO 2020169075 A1 WO2020169075 A1 WO 2020169075A1 CN 2020076116 W CN2020076116 W CN 2020076116W WO 2020169075 A1 WO2020169075 A1 WO 2020169075A1
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strip
steel
weathering steel
strength
thin
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PCT/CN2020/076116
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French (fr)
Chinese (zh)
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陈爱华
李化龙
刘新院
施一新
刘俭
马毅
刘玉君
吴荣洲
史华跃
郭海荣
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江苏沙钢集团有限公司
江苏省沙钢钢铁研究院有限公司
张家港中美超薄带科技有限公司
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Publication of WO2020169075A1 publication Critical patent/WO2020169075A1/en

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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
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium with copper
    • 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
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese

Definitions

  • the invention belongs to the field of low-alloy steel manufacturing, and specifically relates to a low-cost, short-flow, easy-to-weld, high-strength weathering steel strip and a production method thereof. It can be used in the manufacturing of containers, buildings, bridges, railway carriages, etc. .
  • Weathering steel also known as atmospheric corrosion resistant steel, often adds alloying elements such as Cu, P, Cr, Ni, Mo to improve the atmospheric corrosion resistance of steel grades, making it have better corrosion resistance compared with ordinary carbon steel. Compared with stainless steel, it has lower manufacturing cost. With the wide application of weathering steel, containers, bridges, buildings and other fields also put forward higher requirements for the strength of weathering steel, and 09CuPCrNi can only guarantee the strength of 345MPa. In addition, because traditional hot rolling is difficult to control the plate shape in the production of thin gauge products, it is very difficult to produce thin gauge high-strength weathering steel, and the production efficiency is very low. Although, in recent years, there have been cases of using CSP thin slab continuous casting and rolling process to produce thin gauge weathering steel, but it also has the disadvantages of high production cost and relatively long production process.
  • Patent document CN101824581B discloses a high-strength weather-resistant steel sheet with a yield strength of 450MPa and its production method. It adopts a converter-CSP production process and adopts Nb microalloying and controlled rolling and controlled cooling methods for production to obtain high strength. The content of Cr and Ni is higher, the alloy cost and production cost are higher.
  • Patent document CN108103398A discloses a 460MPa grade high-strength and high weathering steel plate and its production method. The strength of weathering steel is improved by adding various microalloy elements such as Nb, Ti, and B. At the same time, it adopts converter steelmaking, LF refining, and slab connection.
  • Patent document CN108570601A discloses a low-carbon bainite weathering steel and a production method thereof.
  • the strength of the weathering steel is improved by adding microalloying elements such as Mo and Ti, and the microstructure is controlled to be more than 95% carbon-free bainite and A small amount of austenite and Cu-Ni aging precipitates on the grain boundary, the production process is very complicated, and the production is difficult.
  • Patent document CN109023048A discloses a 460MPa-class high-strength seismic, fire-resistant and weather-resistant steel hot-rolled coil and a production method thereof.
  • the weather-resistant steel strip produced by it has a thickness of 6-16 mm, and the production of weather-resistant steel thin gauge products has not been realized.
  • the weathering steel in the above patent documents has a high C content and belongs to peritectic steel. During the continuous casting of slabs, due to the peritectic reaction during the solidification of molten steel, cracks are easily generated on the surface of the slab, and the final steel plate is cracked. Affecting the surface quality of the steel sheet, such defects increase the difficulty of producing weathering steel strips when rolling thin gauge products. Therefore, the development of a high-strength, low-cost, easy-to-produce, high-quality, thin-gauge weathering steel product is an urgent need for a wide range of applications.
  • the present invention provides a new type of high-strength weathering steel strip Its production method adopts the thin strip continuous casting and rolling process, which greatly shortens the production process and reduces the production cost; adopts rapid cooling to improve the strength of the strip and saves alloy costs; and the design of controlling the C content improves the weathering steel
  • the present invention also discloses a method for producing a high-strength weathering steel strip, which is carried out according to the following steps:
  • the chemical composition of molten steel is: C: ⁇ 0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt%, P: ⁇ 0.015wt%, S: ⁇ 0.003wt%, Cr: ⁇ 0.50wt%, Cu : 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities;
  • the qualified molten steel is continuously cast into a casting belt through a pair of oppositely rotating casting rollers;
  • the cast strip is hot rolled into thin strip steel after one pass;
  • the thin steel strip after hot rolling is cooled by aerosol and then coiled into a coil by a coiler.
  • the thickness of the cast strip is 1.4-2.5 mm.
  • the degree of superheat during continuous casting of molten steel is controlled below 100°C.
  • the reduction of the cast strip after one pass of the hot rolling mill is 15-65%.
  • the thickness of the hot-rolled thin strip formed by hot rolling of the cast strip is 0.7-2.0 mm.
  • the temperature at which the cast strip enters the hot rolling mill is above 950°C.
  • the hot-rolled thin strip is cooled to 450-650°C through aerosol.
  • the structure of the cooled hot-rolled thin strip steel is acicular ferrite and a small amount of pearlite.
  • the yield strength of the hot-rolled thin strip is above 450 MPa.
  • the present invention also discloses a high-strength weathering steel strip, which is produced using the aforementioned method for producing a high-strength weathering steel strip.
  • a high-strength weathering steel thin strip of the present invention preferably, its yield strength is above 450 MPa, and the microstructure of the strip steel is acicular ferrite and a small amount of pearlite.
  • the present invention discloses a high-strength weathering steel strip
  • the chemical composition of the steel includes: C: ⁇ 0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt% , P: ⁇ 0.015wt%, S: ⁇ 0.003wt%, Cr: ⁇ 0.50wt%, Cu: 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities.
  • Figure 1 is the metallurgical structure of the high-strength weathering steel thin strip according to the present invention.
  • the chemical composition of molten steel is: C: 0.020wt%, Si: 0.30wt%, Mn: 1.80wt%, P: 0.01wt%, S: 0.002wt%, Cr: 0.40wt%, Cu: 0.50wt%, Nb: 0.10 wt%, the rest is iron and unavoidable impurities;
  • the qualified molten steel is continuously cast into a cast strip with a thickness of 2.0mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 60°C;
  • the cast strip is hot rolled into a thin strip after one pass, the hot rolling reduction is 50%, and the temperature of the strip before entering the hot rolling mill is 980°C;
  • the hot-rolled steel strip is cooled to 620°C by aerosol cooling, and then coiled into a coil.
  • the weathering steel strip obtained through the above steps has a thickness of 1.0 mm.
  • the mechanical properties of the strip are tested, and the yield strength is 455 MPa.
  • the chemical composition of molten steel is: C: 0.028wt%, Si: 0.25wt%, Mn: 1.60wt%, P: 0.008wt%, S: 0.0022wt%, Cr: 0.45wt%, Cu: 0.90wt%, Nb: 0.22 wt%, the rest is iron and unavoidable impurities;
  • the qualified molten steel is continuously cast into a cast strip with a thickness of 2.4mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 40°C;
  • the cast strip is hot rolled into a thin strip after one pass, the hot rolling reduction is 62.5%, and the temperature of the strip before entering the hot rolling mill is 1058°C;
  • the hot-rolled steel strip is cooled to 460°C by aerosol cooling, and then coiled into a coil.
  • the weathering steel strip obtained through the above steps has a thickness of 0.9mm, and the mechanical properties of the strip are tested, and the yield strength is 520MPa.
  • the chemical composition of molten steel is: C: 0.025wt%, Si: 0.20wt%, Mn: 1.40wt%, P: 0.012wt%, S: 0.0023wt%, Cr: 0.48wt%, Cu: 0.70wt%, Nb: 0.18 wt%, the rest is iron and unavoidable impurities;
  • the qualified molten steel is continuously cast into a casting strip with a thickness of 1.6mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 20°C;
  • the cast strip is made into thin strip steel after one pass of hot rolling, the hot rolling reduction is 25%, and the temperature of the strip steel before entering the hot rolling mill is 1020°C;
  • the hot-rolled steel strip is cooled to 520°C by aerosol cooling, and coiled into a coil.
  • the thickness of the weathering steel thin strip obtained through the above steps is 1.2mm.
  • the mechanical properties of the thin strip are tested, and the yield strength is 492MPa.

Abstract

A high-strength weather-proof thin steel strip and a production method therefor. The method comprises the following steps: smelting, wherein components and percentages in weight thereof comprised in the steel are respectively: C: ≤ 0.03; Si: 0.10-0.40; Mn: 1.50-2.00; P: ≤ 0.015; S: ≤ 0.003; Cr: ≤ 0.50; Cu: 0.20-1.00%; and Nb: 0.05-0.50, and the balance being iron and unavoidable impurities; continuous casting of a thin strip: performing continuous casting on molten steel qualified by the smelting to form a cast strip having a thickness of 1.4-2.5 mm by using a pair of casting rollers rotating in opposite directions, wherein the molten steel overheating temperature is controlled to be 100°C or below; online hot rolling of the cast strip, wherein the first-pass hot rolling reduction is 15-65%, and the temperature of the strip steel before entering a rolling mill is 950°C or above; and cooling and coiling: cooling the hot-rolled strip steel to 450-650°C by means of aerosol to obtain acicular ferrite and a small amount of pearlite structures, and then coiling the thin steel strip into a roll by a coiling machine.

Description

一种高强度耐候钢薄带及其生产方法High-strength weather-resistant steel thin strip and production method thereof 技术领域Technical field
本发明属于低合金钢制造领域，具体地涉及一种低成本、短流程、易焊接、高强度的耐候钢薄带及其生产方法，其可应用于集装箱、建筑、桥梁和铁路车厢等制造中。The invention belongs to the field of low-alloy steel manufacturing, and specifically relates to a low-cost, short-flow, easy-to-weld, high-strength weathering steel strip and a production method thereof. It can be used in the manufacturing of containers, buildings, bridges, railway carriages, etc. .
背景技术Background technique
耐候钢，也称为耐大气腐蚀钢，常添加Cu、P、Cr、Ni、Mo等合金元素，提高钢种的耐大气腐蚀性能，使得其与普碳钢相比具有好的耐腐蚀性能，与不锈钢比具有低的制造成本。随着耐候钢的广泛应用，集装箱、桥梁、建筑等领域对耐候钢的强度也提出了更高的要求，而09CuPCrNi只能保证345MPa的强度。另外，由于传统热连轧在薄规格产品生产时，板形难于控制，生产薄规格高强度耐候钢具有很大的难度，并且生产效率非常地下。虽然，近年来出现了采用CSP薄板坯连铸连轧工艺生产薄规格耐候钢的事例，但是其也有生产成本较高，生产流程相对较长的缺点。Weathering steel, also known as atmospheric corrosion resistant steel, often adds alloying elements such as Cu, P, Cr, Ni, Mo to improve the atmospheric corrosion resistance of steel grades, making it have better corrosion resistance compared with ordinary carbon steel. Compared with stainless steel, it has lower manufacturing cost. With the wide application of weathering steel, containers, bridges, buildings and other fields also put forward higher requirements for the strength of weathering steel, and 09CuPCrNi can only guarantee the strength of 345MPa. In addition, because traditional hot rolling is difficult to control the plate shape in the production of thin gauge products, it is very difficult to produce thin gauge high-strength weathering steel, and the production efficiency is very low. Although, in recent years, there have been cases of using CSP thin slab continuous casting and rolling process to produce thin gauge weathering steel, but it also has the disadvantages of high production cost and relatively long production process.
专利文献CN101824581B公开了一种屈服强度450MPa级高强耐候钢板及其生产方法，采用转炉-CSP生产工艺，并采用Nb微合金化以及控轧控冷的方法进行生产，以得到高强度的目的，其Cr和Ni含量较高，合金成本和生产成本较高。专利文献CN108103398A公开了一种460MPa级高强度高耐候钢板及其生产方法，通过添加Nb、Ti、B等多种微合金元素提高耐候钢的强度，同时采用转炉炼钢、LF精炼、板坯连铸、板坯缓冷、板坯加热、高压水除鳞、粗轧轧制、精轧轧制、在线控制冷却等多道次工序，生产流程长且繁琐，所生产的钢板厚度较厚，生产成本和生产效率低下。专利文献CN108570601A公开了一种低碳贝氏体耐候钢及其生产方法，通过添加Mo和Ti等微合金元素提高耐候钢的强度，并控制其微观组织为95％以上的无碳贝氏体和晶界上少量奥氏体以及Cu-Ni时效析出相，其生产工艺非常复杂，生产难度较大。专利文献CN109023048A公开了一种460MPa级高强抗震耐火耐候钢热轧卷板及其生产方法，其生产的耐候带钢厚度为6-16mm，未实现耐候钢薄规格产品的生产。而上述专利文献中的耐 候钢的C含量较高，属于包晶钢，在板坯连铸时，由于钢水凝固时发生包晶反应，容易在板坯表面产生裂纹，并导致最终钢板出现裂纹，影响钢板表面质量，在轧制薄规格产品时，此种缺陷加大了耐候钢薄带的生产难度。因此，研发一种高强度、低成本、易生产、高质量、薄规格耐候钢产品是广大应用领域的迫切需求。Patent document CN101824581B discloses a high-strength weather-resistant steel sheet with a yield strength of 450MPa and its production method. It adopts a converter-CSP production process and adopts Nb microalloying and controlled rolling and controlled cooling methods for production to obtain high strength. The content of Cr and Ni is higher, the alloy cost and production cost are higher. Patent document CN108103398A discloses a 460MPa grade high-strength and high weathering steel plate and its production method. The strength of weathering steel is improved by adding various microalloy elements such as Nb, Ti, and B. At the same time, it adopts converter steelmaking, LF refining, and slab connection. Casting, slab slow cooling, slab heating, high-pressure water descaling, rough rolling, finishing rolling, on-line controlled cooling and other multiple processes, the production process is long and cumbersome, the thickness of the produced steel plate is thick, and the production Cost and production efficiency are low. Patent document CN108570601A discloses a low-carbon bainite weathering steel and a production method thereof. The strength of the weathering steel is improved by adding microalloying elements such as Mo and Ti, and the microstructure is controlled to be more than 95% carbon-free bainite and A small amount of austenite and Cu-Ni aging precipitates on the grain boundary, the production process is very complicated, and the production is difficult. Patent document CN109023048A discloses a 460MPa-class high-strength seismic, fire-resistant and weather-resistant steel hot-rolled coil and a production method thereof. The weather-resistant steel strip produced by it has a thickness of 6-16 mm, and the production of weather-resistant steel thin gauge products has not been realized. However, the weathering steel in the above patent documents has a high C content and belongs to peritectic steel. During the continuous casting of slabs, due to the peritectic reaction during the solidification of molten steel, cracks are easily generated on the surface of the slab, and the final steel plate is cracked. Affecting the surface quality of the steel sheet, such defects increase the difficulty of producing weathering steel strips when rolling thin gauge products. Therefore, the development of a high-strength, low-cost, easy-to-produce, high-quality, thin-gauge weathering steel product is an urgent need for a wide range of applications.
发明内容Summary of the invention
针对现有的高强度耐候钢薄带生产流程长、生产难度大、表面质量差、合金成本高、生产效率低、焊接性能差等问题，本发明提供了一种新型的高强度耐候钢薄带及其生产方法，采用薄带连铸连轧工艺，大幅度缩短了生产流程，降低了生产成本；采用快速冷却提高带钢强度，节约了合金成本；并控制C含量的设计，提高了耐候钢的焊接性能并避免了连铸裂纹的产生，提高了带钢表面质量和焊接性能、改善耐候钢的表面质量。Aiming at the problems of long production process, difficult production, poor surface quality, high alloy cost, low production efficiency, and poor welding performance of the existing high-strength weathering steel strip, the present invention provides a new type of high-strength weathering steel strip Its production method adopts the thin strip continuous casting and rolling process, which greatly shortens the production process and reduces the production cost; adopts rapid cooling to improve the strength of the strip and saves alloy costs; and the design of controlling the C content improves the weathering steel The welding performance and avoid the occurrence of continuous casting cracks, improve the surface quality and welding performance of the strip steel, and improve the surface quality of weathering steel.
为了实现上述目的，一方面，本发明还公开了一种高强度耐候钢薄带的生产方法，按照以下步骤进行：In order to achieve the above objective, on the one hand, the present invention also discloses a method for producing a high-strength weathering steel strip, which is carried out according to the following steps:
(1)冶炼(1) Smelting
钢水化学成分为：C：≤0.03wt％，Si：0.10-0.40wt％，Mn：1.50-2.00wt％，P：≤0.015wt％，S：≤0.003wt％，Cr：≤0.50wt％，Cu：0.20-1.00wt％，Nb：0.05-0.50wt％，其余为铁和不可避免的杂质；The chemical composition of molten steel is: C: ≤0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt%, P: ≤0.015wt%, S: ≤0.003wt%, Cr: ≤0.50wt%, Cu : 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities;
(2)薄带连铸(2) Thin strip continuous casting
将冶炼合格的钢水经过一对相向旋转的铸辊连铸成铸带；The qualified molten steel is continuously cast into a casting belt through a pair of oppositely rotating casting rollers;
(3)铸带在线热轧(3) On-line hot rolling of cast strip
铸带经过1道次热轧轧制成薄带钢；The cast strip is hot rolled into thin strip steel after one pass;
(4)冷却及卷取(4) Cooling and coiling
热轧后的薄带钢通过气雾冷却，并经卷取机卷取成卷。The thin steel strip after hot rolling is cooled by aerosol and then coiled into a coil by a coiler.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，铸带厚度为1.4-2.5mm。According to the method for producing a thin strip of high-strength weathering steel according to the present invention, preferably, the thickness of the cast strip is 1.4-2.5 mm.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，钢水连铸时的过热度控制在100℃以下。According to the method for producing a high-strength weathering steel strip of the present invention, preferably, the degree of superheat during continuous casting of molten steel is controlled below 100°C.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，铸带经过 热轧机1道次热轧的压下量为15-65％。According to the method for producing a high-strength weathering steel thin strip of the present invention, preferably, the reduction of the cast strip after one pass of the hot rolling mill is 15-65%.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，铸带经过热轧形成热轧薄带钢的厚度为0.7-2.0mm。According to the method for producing a high-strength weathering steel thin strip of the present invention, preferably, the thickness of the hot-rolled thin strip formed by hot rolling of the cast strip is 0.7-2.0 mm.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，铸带进入热轧机的温度在950℃以上。According to the method for producing a high-strength weathering steel thin strip of the present invention, preferably, the temperature at which the cast strip enters the hot rolling mill is above 950°C.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，热轧后的薄带钢经过气雾冷却至450-650℃。According to the method for producing a high-strength weathering steel thin strip of the present invention, preferably, the hot-rolled thin strip is cooled to 450-650°C through aerosol.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，冷却后的热轧薄带钢的组织为针状铁素体和少量珠光体。According to the method for producing a high-strength weathering steel thin strip of the present invention, preferably, the structure of the cooled hot-rolled thin strip steel is acicular ferrite and a small amount of pearlite.
根据本发明的一种高强度耐候钢薄带的生产方法，优选地，热轧薄带钢的屈服强度在450MPa以上。According to a method for producing a high-strength weathering steel strip according to the present invention, preferably, the yield strength of the hot-rolled thin strip is above 450 MPa.
为了实现上述目的，另一方面，本发明还公开了一种高强度耐候钢薄带，其使用前述的一种高强度耐候钢薄带的生产方法进行生产。In order to achieve the above objective, on the other hand, the present invention also discloses a high-strength weathering steel strip, which is produced using the aforementioned method for producing a high-strength weathering steel strip.
根据本发明的一种高强度耐候钢薄带，优选地，其屈服强度在450MPa以上，带钢的微观组织为针状铁素体和少量珠光体。According to a high-strength weathering steel thin strip of the present invention, preferably, its yield strength is above 450 MPa, and the microstructure of the strip steel is acicular ferrite and a small amount of pearlite.
为了实现上述目的，又一方面，本发明公开了一种高强度耐候钢薄带，钢的化学成分包括：C：≤0.03wt％，Si：0.10-0.40wt％，Mn：1.50-2.00wt％，P：≤0.015wt％，S：≤0.003wt％，Cr：≤0.50wt％，Cu：0.20-1.00wt％，Nb：0.05-0.50wt％，其余为铁和不可避免的杂质。In order to achieve the above objective, in another aspect, the present invention discloses a high-strength weathering steel strip, the chemical composition of the steel includes: C: ≤0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt% , P: ≤0.015wt%, S: ≤0.003wt%, Cr: ≤0.50wt%, Cu: 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities.
有益技术效果Beneficial technical effect
与现有技术相比，本发明的特点和有益的技术效果至少包括：Compared with the prior art, the features and beneficial technical effects of the present invention include at least:
(1)大幅度降低了耐候钢中的C含量，减少了钢水凝固过程中包晶反应的转变量以及固态相变过程中体积变化量，从而降低了铸带裂纹出现的风险，大大提高了铸带的表面质量以及最终薄带钢的表面质量，提高了耐候钢的弯曲性能和使用性能；(1) The C content in weathering steel is greatly reduced, the transformation amount of the peritectic reaction during the solidification of molten steel and the volume change during the solid phase transformation process are reduced, thereby reducing the risk of cracks in the casting strip and greatly improving the casting The surface quality of the strip and the surface quality of the final thin strip steel improve the bending performance and use performance of weathering steel;
(2)降低了耐候钢中的C含量，大幅度提升了耐候钢在使用过程中的焊接性能；(2) Reduce the C content in weathering steel and greatly improve the welding performance of weathering steel during use;
(3)采用薄带连铸加1道次热轧的生产工艺，使得高强度耐候钢生产流程大幅度缩短，生产成本大幅度降低；(3) The production process of thin strip continuous casting and one pass of hot rolling is adopted, which greatly shortens the production process of high-strength weathering steel and greatly reduces the production cost;
(4)缩短了生产流程，降低了高强度耐候钢薄带的生产难度，使得高强度耐候薄带钢的生产效率大大升高。(4) The production process is shortened, the production difficulty of high-strength weathering steel strip is reduced, and the production efficiency of high-strength weathering steel strip is greatly improved.
附图说明Description of the drawings
为了更清楚地说明本发明的实施例的技术方案，下面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设计本发明的一些实施例，而非对本发明的限制。In order to explain the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments are briefly introduced below. Obviously, the drawings in the following description only design some embodiments of the present invention, but do not limit the present invention.
图1是根据本发明的高强度耐候钢薄带的金相组织。Figure 1 is the metallurgical structure of the high-strength weathering steel thin strip according to the present invention.
具体实施方式detailed description
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。In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
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。Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall be the ordinary meanings understood by those with ordinary skills in the field to which the present invention belongs.
实施例1Example 1
本实施例按照以下步骤进行：This embodiment follows the following steps:
(1)冶炼(1) Smelting
钢水化学成分为：C：0.020wt％，Si：0.30wt％，Mn：1.80wt％，P：0.01wt％，S：0.002wt％，Cr：0.40wt％，Cu：0.50wt％，Nb：0.10wt％，其余为铁和不可避免的杂质；The chemical composition of molten steel is: C: 0.020wt%, Si: 0.30wt%, Mn: 1.80wt%, P: 0.01wt%, S: 0.002wt%, Cr: 0.40wt%, Cu: 0.50wt%, Nb: 0.10 wt%, the rest is iron and unavoidable impurities;
(2)薄带连铸(2) Thin strip continuous casting
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2.0mm的铸带；钢水的过热度为60℃；The qualified molten steel is continuously cast into a cast strip with a thickness of 2.0mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 60℃;
(3)铸带在线热轧(3) On-line hot rolling of cast strip
铸带经过1道次热轧轧制成薄带钢，热轧压下量为50％，带钢进热轧机前的温度为980℃；The cast strip is hot rolled into a thin strip after one pass, the hot rolling reduction is 50%, and the temperature of the strip before entering the hot rolling mill is 980℃;
(4)冷却及卷取(4) Cooling and coiling
热轧带钢通过气雾冷却而冷却至620℃，并卷取成卷。The hot-rolled steel strip is cooled to 620°C by aerosol cooling, and then coiled into a coil.
经过以上步骤所得到的耐候钢薄带厚度为1.0mm，对薄带进行力学性能测试，屈服强度为455MPa。The weathering steel strip obtained through the above steps has a thickness of 1.0 mm. The mechanical properties of the strip are tested, and the yield strength is 455 MPa.
实施例2Example 2
本实施例按照以下步骤进行：This embodiment follows the following steps:
(1)冶炼(1) Smelting
钢水化学成分为：C：0.028wt％，Si：0.25wt％，Mn：1.60wt％，P：0.008wt％，S：0.0022wt％，Cr：0.45wt％，Cu：0.90wt％，Nb：0.22wt％，其余为铁和不可避免的杂质；The chemical composition of molten steel is: C: 0.028wt%, Si: 0.25wt%, Mn: 1.60wt%, P: 0.008wt%, S: 0.0022wt%, Cr: 0.45wt%, Cu: 0.90wt%, Nb: 0.22 wt%, the rest is iron and unavoidable impurities;
(2)薄带连铸(2) Thin strip continuous casting
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；钢水的过热度为40℃；The qualified molten steel is continuously cast into a cast strip with a thickness of 2.4mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 40℃;
(3)铸带在线热轧(3) On-line hot rolling of cast strip
铸带经过1道次热轧轧制成薄带钢，热轧压下量为62.5％，带钢进热轧机前的温度为1058℃；The cast strip is hot rolled into a thin strip after one pass, the hot rolling reduction is 62.5%, and the temperature of the strip before entering the hot rolling mill is 1058°C;
(4)冷却及卷取(4) Cooling and coiling
热轧带钢通过气雾冷却而冷却至460℃，并卷取成卷。The hot-rolled steel strip is cooled to 460°C by aerosol cooling, and then coiled into a coil.
经过以上步骤所得到的耐候钢薄带厚度为0.9mm，对薄带进行力学性能测试，屈服强度为520MPa。The weathering steel strip obtained through the above steps has a thickness of 0.9mm, and the mechanical properties of the strip are tested, and the yield strength is 520MPa.
实施例3Example 3
本实施例按照以下步骤进行：This embodiment follows the following steps:
(1)冶炼(1) Smelting
钢水化学成分为：C：0.025wt％，Si：0.20wt％，Mn：1.40wt％，P：0.012wt％，S：0.0023wt％，Cr：0.48wt％，Cu：0.70wt％，Nb：0.18wt％，其余为铁和不可避免的杂质；The chemical composition of molten steel is: C: 0.025wt%, Si: 0.20wt%, Mn: 1.40wt%, P: 0.012wt%, S: 0.0023wt%, Cr: 0.48wt%, Cu: 0.70wt%, Nb: 0.18 wt%, the rest is iron and unavoidable impurities;
(2)薄带连铸(2) Thin strip continuous casting
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1.6mm的铸 带；钢水的过热度为20℃；The qualified molten steel is continuously cast into a casting strip with a thickness of 1.6mm through a pair of oppositely rotating casting rolls; the superheat of the molten steel is 20℃;
(3)铸带在线热轧(3) On-line hot rolling of cast strip
铸带经过1道次热轧轧制成薄带钢，热轧压下量为25％，带钢进热轧机前的温度为1020℃；The cast strip is made into thin strip steel after one pass of hot rolling, the hot rolling reduction is 25%, and the temperature of the strip steel before entering the hot rolling mill is 1020℃;
(4)冷却及卷取(4) Cooling and coiling
热轧带钢通过气雾冷却而冷却至520℃，并卷取成卷。The hot-rolled steel strip is cooled to 520°C by aerosol cooling, and coiled into a coil.
经过以上步骤所得到的耐候钢薄带厚度为1.2mm，对薄带进行力学性能测试，屈服强度为492MPa。The thickness of the weathering steel thin strip obtained through the above steps is 1.2mm. The mechanical properties of the thin strip are tested, and the yield strength is 492MPa.
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。The foregoing descriptions are merely exemplary embodiments of the present invention, and are not used to limit the protection scope of the present invention, which is determined by the appended claims.

Claims (12)

  1. 一种高强度耐候钢薄带的生产方法，其特征在于，生产方法包括如下步骤：A production method of high-strength weathering steel strip, characterized in that the production method includes the following steps:
    (1)冶炼(1) Smelting
    冶炼得到如下成分的钢水：C：≤0.03wt％，Si：0.10-0.40wt％，Mn：1.50-2.00wt％，P：≤0.015wt％，S：≤0.003wt％，Cr：≤0.50wt％，Cu：0.20-1.00wt％，Nb：0.05-0.50wt％，其余为铁和不可避免的杂质；The molten steel with the following composition is obtained by smelting: C: ≤0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt%, P: ≤0.015wt%, S: ≤0.003wt%, Cr: ≤0.50wt% , Cu: 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities;
    (2)薄带连铸(2) Thin strip continuous casting
    将所述钢水经过一对相向旋转的铸辊之间的辊隙以连铸成铸带；Passing the molten steel through a nip between a pair of oppositely rotating casting rolls for continuous casting into a casting strip;
    (3)铸带在线热轧(3) On-line hot rolling of cast strip
    铸带经过1道次热轧轧制成薄带钢；The cast strip is hot rolled into thin strip steel after one pass;
    (4)冷却及卷取(4) Cooling and coiling
    热轧后的薄带钢通过气雾冷却，并经卷取机卷取成卷。The thin steel strip after hot rolling is cooled by aerosol and then coiled into a coil by a coiler.
  2. 如权利要求1或权利要求2所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(2)中，铸带厚度为1.4-2.5mm。The method for producing a thin strip of high-strength weathering steel according to claim 1 or claim 2, wherein in step (2), the thickness of the cast strip is 1.4-2.5 mm.
  3. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(2)中，钢水连铸时的过热度控制在100℃以下。The method for producing high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (2), the degree of superheat during continuous casting of molten steel is controlled below 100°C.
  4. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(3)中，铸带经过热轧机1道次热轧的压下量为15-65％。The method for producing a high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (3), the reduction of the cast strip after one pass of the hot rolling mill is 15- 65%.
  5. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，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。The method for producing a high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (3), the cast strip is hot-rolled to form a hot-rolled thin strip with a thickness of 0.7-2.0 mm .
  6. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(3)中，铸带进入热轧机的温度在950℃以上。The method for producing high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (3), the temperature at which the cast strip enters the hot rolling mill is above 950°C.
  7. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(4)中，热轧后的薄带钢经过气雾冷却至450-650℃。The method for producing a high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (4), the hot-rolled thin strip is cooled to 450-650°C by aerosol.
  8. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(4)中，冷却后的热轧薄带钢的组织为针状铁素体 和少量珠光体。The method for producing a high-strength weathering steel thin strip according to any one of the preceding claims, characterized in that, in step (4), the structure of the cooled hot-rolled thin strip steel is acicular ferrite and a small amount of Pearlite.
  9. 如前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法，其特征在于，步骤(4)中，热轧薄带钢的屈服强度在450MPa以上。The method for producing a high-strength weathering steel strip according to any one of the preceding claims, characterized in that, in step (4), the yield strength of the hot-rolled thin strip steel is above 450 MPa.
  10. 一种高强度耐候钢薄带，其特征在于，使用前述权利要求中的任意一项所述的高强度耐候钢薄带的生产方法进行生产。A high-strength weathering steel strip, characterized in that it is produced using the method for producing a high-strength weathering steel strip according to any one of the preceding claims.
  11. 如权利要求10所述的高强度耐候钢薄带，其特征在于，薄带钢的屈服强度在450MPa以上，带钢的微观组织为针状铁素体和少量珠光体。The high-strength weathering steel thin strip according to claim 10, characterized in that the yield strength of the thin strip steel is above 450 MPa, and the microstructure of the strip steel is acicular ferrite and a small amount of pearlite.
  12. 一种高强度耐候钢薄带，其特征在于，钢的化学成分包括：C：≤0.03wt％，Si：0.10-0.40wt％，Mn：1.50-2.00wt％，P：≤0.015wt％，S：≤0.003wt％，Cr：≤0.50wt％，Cu：0.20-1.00wt％，Nb：0.05-0.50wt％，其余为铁和不可避免的杂质。A high-strength weathering steel strip, characterized in that the chemical composition of the steel includes: C: ≤0.03wt%, Si: 0.10-0.40wt%, Mn: 1.50-2.00wt%, P: ≤0.015wt%, S : ≤0.003wt%, Cr: ≤0.50wt%, Cu: 0.20-1.00wt%, Nb: 0.05-0.50wt%, the rest is iron and unavoidable impurities.
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CN109881091A (en) * 2019-02-21 2019-06-14 江苏沙钢集团有限公司 A kind of high-strength weathering steel strip and its production method

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