WO2021057197A1 - Rolling process of welding wire steel for weather-resistant bridge - Google Patents

Rolling process of welding wire steel for weather-resistant bridge Download PDF

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Publication number
WO2021057197A1
WO2021057197A1 PCT/CN2020/101764 CN2020101764W WO2021057197A1 WO 2021057197 A1 WO2021057197 A1 WO 2021057197A1 CN 2020101764 W CN2020101764 W CN 2020101764W WO 2021057197 A1 WO2021057197 A1 WO 2021057197A1
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welding wire
hot
rolling process
weather
heating
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PCT/CN2020/101764
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French (fr)
Chinese (zh)
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肖丙政
王灿祥
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南京钢铁股份有限公司
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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
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires 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
    • C21D11/00—Process control or regulation for heat treatments
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/002—Bainite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/008—Martensite

Definitions

  • the invention belongs to the field of iron and steel metallurgy and processing technology, in particular to a rolling process of welding wire steel for weather-resistant bridges, and in particular to a rolling process that can effectively control the hot-rolled structure of weather-resistant steel.
  • Paint-free weathering steel bridges came into being under such expectations. Paint-free weathering steel bridges reduce periodic steel bridges. The cost of maintenance, especially in areas with severe salt damage near the coastline, the coating-free weathering steel bridge highlights its advantages. Coating-free weathering bridges are currently vigorously developed in China, and 500MPa weathering bridge steel is included in the national 2035 material power plan.
  • the production process used in the conventional process of weather-resistant welding wire for weather-resistant bridges is: hot-rolled wire ⁇ pickling ⁇ phosphating ⁇ rough drawing ⁇ annealing ⁇ fine drawing ⁇ copper plating ⁇ coiling ⁇ packaging and warehousing.
  • the welding wire processing enterprises eagerly hope that the steel mill can solve the drawing performance problem.
  • the present invention proposes a rolling process of welding wire steel for weather-resistant bridges, which can eliminate the problem of martensite in hot-rolled materials and improve drawing performance.
  • the technical scheme adopted by the present invention is a rolling process of welding wire steel for weather-resistant bridges, which includes heating, hot rolling and slow cooling processes, and the heating temperature of the heating process is controlled at 960-1000°C; The final rolling temperature of the process is controlled at 805-835°C; the air-cooling line of the slow cooling process opens the cover at the entrance.
  • the heating process adopts a three-empty one-in steel feeding method, that is, one step is empty after every three billets are fed.
  • This method can reduce the time of the billets in the furnace and effectively avoid the strength increase caused by the solid solution of the alloy.
  • the hot rolling process is rolled in the ( ⁇ + ⁇ ) two-phase zone, and the deformation-induced phase transformation is used to rapidly increase the proportion of ferrite, while breaking the grains, increasing the nucleation point, and increasing the austenite to ferrite The speed of the transformation of body and bainite.
  • the purpose of opening the cover at the entrance in the slow cooling process is to increase the degree of subcooling required for the phase change and increase the speed of the phase change; preferably, the remaining covers are fully closed for slow cooling, so that the austenite becomes ferrite The body and bainite are transformed, and martensite is not produced.
  • the invention successfully eliminates the martensite structure in the hot-rolled material by optimizing the heating process, the hot rolling process and the slow cooling process.
  • the ferrite ratio in the metallographic structure is increased from 40% to more than 70%, and the rest is granular shellfish
  • the drawing performance is significantly improved.
  • the wire breakage rate during the welding wire processing is less than 0.5 times/ton.
  • the hot-rolled wire rod can be directly drawn to 1.2mm welding wire, which fully reaches the quality level of the annealed state.
  • the present invention has the following advantages: (1) The hot-rolled structure can be effectively controlled, and the hot-rolled structure is ferrite plus granular bainite, without martensite that affects drawing; (2) no intermediate annealing is required, The hot-rolled wire rod can be directly drawn to 1.2mm welding wire, which reduces the wire-breaking rate of the welding wire; (3) It does not increase the production cost, and at the same time, it can reduce the raw material manufacturing cost, which has significant economic benefits.
  • the present invention reduces the heating temperature, and the energy consumption per ton of steel can be reduced by 10.7 yuan. Based on 1,000 tons per year, it can reduce the cost of the steel plant by 10,700 yuan per year; eliminating the annealing process can reduce the cost by 350 yuan per ton of steel. ,Calculated by 1,000 tons per year, it can reduce the direct cost of welding wire processing enterprises by 350,000 yuan per year.
  • Figure 1 is a schematic diagram of the steel feeding method of the present invention
  • Figure 2 is a schematic diagram of the air-cooled line device of the present invention.
  • the weather-resistant welding wire steel of the present invention has a processing flow as follows: molten iron and scrap steel ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ 150 2 continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ packaging and storage.
  • molten iron and scrap steel ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ 150 2 continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ packaging and storage.
  • ER55-1 weather-resistant welding wire steel processing flow molten iron and scrap ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ hot-rolled wire rod ⁇ pickling ⁇ phosphorus Chemical ⁇ rough drawing ⁇ fine drawing ⁇ copper plating ⁇ winding ⁇ packing and warehousing.
  • the heating temperature is 980 degrees and the final rolling temperature of the hot rolling process is 820 degrees.
  • the Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
  • ER55-1 weather-resistant welding wire steel processing flow molten iron and scrap ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ hot-rolled wire rod ⁇ pickling ⁇ phosphorus Chemical ⁇ rough drawing ⁇ fine drawing ⁇ copper plating ⁇ winding ⁇ packing and warehousing.
  • the heating temperature is 1000 degrees
  • the final rolling temperature of the hot rolling process is 805 degrees.
  • the Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
  • ER55-1 weather-resistant welding wire steel processing flow molten iron and scrap ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ hot-rolled wire rod ⁇ pickling ⁇ phosphorus Chemical ⁇ rough drawing ⁇ fine drawing ⁇ copper plating ⁇ winding ⁇ packing and warehousing.
  • the heating temperature is 960 degrees and the final rolling temperature of the hot rolling process is 835 degrees.
  • the Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
  • ER55-1 weather-resistant welding wire steel processing flow molten iron and scrap ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ hot-rolled wire rod ⁇ pickling ⁇ phosphorus Chemical ⁇ rough drawing ⁇ fine drawing ⁇ copper plating ⁇ winding ⁇ packing and warehousing.
  • the rolling process adopts the conventional process, the heating temperature is 1130°C, the final rolling temperature of the hot rolling process is 895°C, and all the covers of the Steyrmore air-cooled line are fully closed.
  • ER55-1 weather-resistant welding wire steel processing flow molten iron and scrap ⁇ EAF electric arc furnace ⁇ LF refining ⁇ VD vacuum degassing ⁇ continuous casting ⁇ heating ⁇ hot rolling ⁇ slow cooling ⁇ coil collection ⁇ inspection ⁇ hot-rolled wire rod ⁇ pickling ⁇ phosphorus Chemical ⁇ rough drawing ⁇ annealing ⁇ fine drawing ⁇ copper plating ⁇ winding ⁇ packing and warehousing.
  • the rolling process adopts the conventional process, the heating temperature is 1100°C, the final rolling temperature of the hot rolling process is 880°C, all the covers of the Steyrmore air-cooled line are fully closed, and the annealing process is added to eliminate the martensite in the structure.
  • the ER55-1 weathering welding wire steel of Examples 1-3 and Comparative Example 1-2 was tested for mechanical area shrinkage, microstructure, hot-rolled tensile strength, and drawing wire breakage. The specific results are shown in Table 1.
  • the mechanical area shrinkage of the weather-resistant welding wire prepared by the present invention is greater than 65%
  • the tensile strength of the hot-rolled state ranges from 595 to 640 MPa
  • the metallographic structure is a large amount of ferrite plus a small amount of granular Bainite
  • the rolling process can complete all the processing procedures of the material without the annealing process, and the prepared welding wire fully reaches the quality level of the annealed state.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Metal Rolling (AREA)
  • Heat Treatment Of Steel (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

A rolling process of welding wire steel for a weather-resistant bridge, comprising heating, hot rolling, and slow cooling processes. The heating temperature in the heating process is controlled to be 960-1000°C. The final rolling temperature in the hot rolling process is controlled to be 805-835°C. A cover at the entrance of an air-cooling line of the slow cooling process is opened, and all the other covers are closed. The rolling process can effectively control a hot-rolled structure. The hot-rolled structure is ferrite plus granular bainite, and martensite that does not affect drawing. The hot-rolled wire rod can be drawn directly into a 1.2 mm welding wire, during which no annealing is required. The process does not increase production costs, and can reduce raw material manufacturing costs, and has significant economic benefits.

Description

一种耐候桥梁用焊丝钢的轧制工艺Rolling process of welding wire steel for weather-resistant bridge 技术领域Technical field
本发明属于钢铁冶金和加工技术领域，尤其涉及一种耐候桥梁用焊丝钢的轧制工艺，具体涉及一种可有效控制耐候钢的热轧态组织的轧制工艺。The invention belongs to the field of iron and steel metallurgy and processing technology, in particular to a rolling process of welding wire steel for weather-resistant bridges, and in particular to a rolling process that can effectively control the hot-rolled structure of weather-resistant steel.
背景技术Background technique
随着普通桥梁的维持管理费用日益提高，人们对桥梁耐久性的要求越来越高，免涂装耐候钢桥在这样的期待下应运而生，免涂装耐候钢桥减少了周期性钢桥维护的费用，特别是在海岸线附近盐害比较严重的地区，免涂装耐候钢桥更突显了它的优势。免涂装耐候桥梁是目前国内大力发展项目，其中500MPa级耐候桥梁钢更是列入了国家2035材料强国计划中。With the increasing maintenance and management costs of ordinary bridges, people have higher and higher requirements for bridge durability. Paint-free weathering steel bridges came into being under such expectations. Paint-free weathering steel bridges reduce periodic steel bridges. The cost of maintenance, especially in areas with severe salt damage near the coastline, the coating-free weathering steel bridge highlights its advantages. Coating-free weathering bridges are currently vigorously developed in China, and 500MPa weathering bridge steel is included in the national 2035 material power plan.
耐候桥梁专用耐候焊丝的常规工艺所用的生产流程是：热轧线材→酸洗→磷化→粗拉→退火→精拉→镀铜→绕盘→包装入库。常规轧制工艺热轧线材中存在大量马氏体组织，如果不在中间道次进行退火处理，则在精拉和绕盘状态下的断丝率较高，无法正常维持生产。因此材料在中间道次退火，不但增加加工成本，而且还影响生产效率，焊丝加工企业迫切希望钢厂能够解决拉拔性能问题。The production process used in the conventional process of weather-resistant welding wire for weather-resistant bridges is: hot-rolled wire → pickling → phosphating → rough drawing → annealing → fine drawing → copper plating → coiling → packaging and warehousing. There is a large amount of martensite structure in the hot-rolled wire rod in the conventional rolling process. If the annealing treatment is not carried out in the middle pass, the wire breakage rate in the state of fine drawing and coiling will be high, and the production cannot be maintained normally. Therefore, the material is annealed in the middle pass, which not only increases the processing cost, but also affects the production efficiency. The welding wire processing enterprises eagerly hope that the steel mill can solve the drawing performance problem.
发明内容Summary of the invention
发明目的：本发明提出一种耐候桥梁用焊丝钢的轧制工艺，该工艺能够消除热轧材中存在马氏体的问题，提高拉拔性能。Objective of the invention: The present invention proposes a rolling process of welding wire steel for weather-resistant bridges, which can eliminate the problem of martensite in hot-rolled materials and improve drawing performance.
技术方案：本发明所采用的技术方案是一种耐候桥梁用焊丝钢的轧制工艺，包括加热、热轧和缓冷工序，所述加热工序的加热温度控制在960～1000℃；所述热轧工序的终轧温度控制在805～835℃；所述缓冷工序的风冷线打开入口处的罩盖。Technical scheme: The technical scheme adopted by the present invention is a rolling process of welding wire steel for weather-resistant bridges, which includes heating, hot rolling and slow cooling processes, and the heating temperature of the heating process is controlled at 960-1000°C; The final rolling temperature of the process is controlled at 805-835°C; the air-cooling line of the slow cooling process opens the cover at the entrance.
优选的，所述加热工序采用进三空一的进钢方式，即每进三支坯料后空一个步距，此方法可减少坯料在炉时间，有效避免合金固溶引起的强度提高。Preferably, the heating process adopts a three-empty one-in steel feeding method, that is, one step is empty after every three billets are fed. This method can reduce the time of the billets in the furnace and effectively avoid the strength increase caused by the solid solution of the alloy.
优选的，所述热轧工序在(α+γ)两相区轧制，利用形变诱导相变，快速增加铁素体比例，同时破碎晶粒，增加形核点，提高奥氏体向铁素体和贝氏体组织转变的速度。Preferably, the hot rolling process is rolled in the (α+γ) two-phase zone, and the deformation-induced phase transformation is used to rapidly increase the proportion of ferrite, while breaking the grains, increasing the nucleation point, and increasing the austenite to ferrite The speed of the transformation of body and bainite.
其中，缓冷工序中打开入口处的罩盖，目的是为了增加相变所需的过冷度，提高相变速度；优选的，其余罩盖全关进行缓慢冷却，使奥氏体向铁素体和贝氏体转变，不产生马氏体。The purpose of opening the cover at the entrance in the slow cooling process is to increase the degree of subcooling required for the phase change and increase the speed of the phase change; preferably, the remaining covers are fully closed for slow cooling, so that the austenite becomes ferrite The body and bainite are transformed, and martensite is not produced.
本发明通过对加热工艺、热轧工艺和缓冷工艺进行优化，成功消除热轧材中的马氏体组织，金相组织中铁素体比例由以前的40％提升到70％以上，其余为粒状贝氏体组织；拉拔性能显著提升，焊丝加工过程中拉拔断丝率在0.5次/吨以下，热轧盘条可直接拉拔到1.2mm规格焊丝，完全达到退火状态的质量水平。The invention successfully eliminates the martensite structure in the hot-rolled material by optimizing the heating process, the hot rolling process and the slow cooling process. The ferrite ratio in the metallographic structure is increased from 40% to more than 70%, and the rest is granular shellfish The drawing performance is significantly improved. The wire breakage rate during the welding wire processing is less than 0.5 times/ton. The hot-rolled wire rod can be directly drawn to 1.2mm welding wire, which fully reaches the quality level of the annealed state.
有益效果：本发明具有以下优点：(1)可有效控制热轧态组织，热轧态组织为铁素体加粒状贝氏体，无影响拉拔的马氏体；(2)中间无需退火，其热轧盘条可直接拉拔到1.2mm规格焊丝，降低了焊丝拉拔断丝率；(3)不增加生产成本，同时可降低原材料制造成本，具有显著的经济效益。Beneficial effects: The present invention has the following advantages: (1) The hot-rolled structure can be effectively controlled, and the hot-rolled structure is ferrite plus granular bainite, without martensite that affects drawing; (2) no intermediate annealing is required, The hot-rolled wire rod can be directly drawn to 1.2mm welding wire, which reduces the wire-breaking rate of the welding wire; (3) It does not increase the production cost, and at the same time, it can reduce the raw material manufacturing cost, which has significant economic benefits.
具体而言，本发明相对常规工艺，降低加热温度，吨钢可降低能耗10.7元，按每年1000吨计算，每年可为钢厂降本10700元；免去退火工艺可吨钢降本350元，按每年1000吨计算，每年可为焊丝加工企业降低直接成本35万元。Specifically, compared with the conventional process, the present invention reduces the heating temperature, and the energy consumption per ton of steel can be reduced by 10.7 yuan. Based on 1,000 tons per year, it can reduce the cost of the steel plant by 10,700 yuan per year; eliminating the annealing process can reduce the cost by 350 yuan per ton of steel. ，Calculated by 1,000 tons per year, it can reduce the direct cost of welding wire processing enterprises by 350,000 yuan per year.
附图说明Description of the drawings
图1是本发明的进钢方式示意图；Figure 1 is a schematic diagram of the steel feeding method of the present invention;
图2是本发明风冷线装置示意图。Figure 2 is a schematic diagram of the air-cooled line device of the present invention.
具体实施方式detailed description
下面结合附图和实施例对本发明的技术方案作进一步的说明。The technical solution of the present invention will be further described below in conjunction with the drawings and embodiments.
本发明的耐候焊丝钢，其加工流程为：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→150 2连铸→加热→热轧→缓冷→集卷→检验→包装入库。通过对轧制工艺涉及到的加热工序、热轧工序和缓冷工序进行优化，其中加热工序和热轧工序都采用低温模式；加热工序采用如图1所示的进三空一的快速进钢方式；缓冷工序的斯太尔摩风冷线如图2所示，1#罩盖处于风冷线入口位置。本发明实施例为ER55-1系列耐候焊丝钢。 The weather-resistant welding wire steel of the present invention has a processing flow as follows: molten iron and scrap steel → EAF electric arc furnace → LF refining → VD vacuum degassing → 150 2 continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → packaging and storage. By optimizing the heating process, hot rolling process and slow cooling process involved in the rolling process, both the heating process and the hot rolling process adopt low-temperature mode; the heating process adopts the three-air-one fast-feeding method as shown in Figure 1. ; The Stelmore air-cooled line in the slow cooling process is shown in Figure 2, and the 1# cover is at the entrance of the air-cooled line. The embodiment of the present invention is ER55-1 series weather-resistant welding wire steel.
实施例1Example 1
ER55-1耐候焊丝钢的加工流程：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→连铸→加热→热轧→缓冷→集卷→检验→热轧线材→酸洗→磷化→粗拉→精拉→镀铜→绕盘→包装入库。针对轧制工艺中的加热工序、热轧工序和缓冷工序进行优化，其中加热温度980度，热轧工序的终轧温度820度，斯太尔摩风冷线打开1#罩盖，其余罩盖全关。ER55-1 weather-resistant welding wire steel processing flow: molten iron and scrap → EAF electric arc furnace → LF refining → VD vacuum degassing → continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → hot-rolled wire rod → pickling → phosphorus Chemical→rough drawing→fine drawing→copper plating→winding→packing and warehousing. Optimize the heating process, hot rolling process and slow cooling process in the rolling process. The heating temperature is 980 degrees and the final rolling temperature of the hot rolling process is 820 degrees. The Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
实施例2Example 2
ER55-1耐候焊丝钢的加工流程：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→连铸→加热→热轧→缓冷→集卷→检验→热轧线材→酸洗→磷化→粗拉→精拉→镀铜→绕盘→包装入库。针对轧制工艺中的加热工序、热轧工序和缓冷工序进行优化，其中加热温度1000度，热轧工序的终轧温度805度，斯太尔摩风冷线打开1#罩盖，其余罩盖全关。ER55-1 weather-resistant welding wire steel processing flow: molten iron and scrap → EAF electric arc furnace → LF refining → VD vacuum degassing → continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → hot-rolled wire rod → pickling → phosphorus Chemical→rough drawing→fine drawing→copper plating→winding→packing and warehousing. Optimize the heating process, hot rolling process and slow cooling process in the rolling process. The heating temperature is 1000 degrees, and the final rolling temperature of the hot rolling process is 805 degrees. The Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
实施例3Example 3
ER55-1耐候焊丝钢的加工流程：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→连铸→加热→热轧→缓冷→集卷→检验→热轧线材→酸洗→磷化→粗拉→精拉→镀铜→绕盘→包装入库。针对轧制工艺中的加热工序、热轧工序和缓冷工序进行优化，其 中加热温度960度，热轧工序的终轧温度835度，斯太尔摩风冷线打开1#罩盖，其余罩盖全关。ER55-1 weather-resistant welding wire steel processing flow: molten iron and scrap → EAF electric arc furnace → LF refining → VD vacuum degassing → continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → hot-rolled wire rod → pickling → phosphorus Chemical→rough drawing→fine drawing→copper plating→winding→packing and warehousing. Optimize the heating process, hot rolling process and slow cooling process in the rolling process. The heating temperature is 960 degrees and the final rolling temperature of the hot rolling process is 835 degrees. The Steyrmore air-cooled line opens the 1# cover, and the rest covers All off.
对比例1Comparative example 1
ER55-1耐候焊丝钢的加工流程：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→连铸→加热→热轧→缓冷→集卷→检验→热轧线材→酸洗→磷化→粗拉→精拉→镀铜→绕盘→包装入库。其中轧制工艺采用常规工艺，加热温度1130℃，热轧工序的终轧温度895℃，斯太尔摩风冷线的所有罩盖全关。ER55-1 weather-resistant welding wire steel processing flow: molten iron and scrap → EAF electric arc furnace → LF refining → VD vacuum degassing → continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → hot-rolled wire rod → pickling → phosphorus Chemical→rough drawing→fine drawing→copper plating→winding→packing and warehousing. The rolling process adopts the conventional process, the heating temperature is 1130℃, the final rolling temperature of the hot rolling process is 895℃, and all the covers of the Steyrmore air-cooled line are fully closed.
对比例2Comparative example 2
ER55-1耐候焊丝钢的加工流程：铁水和废钢→EAF电弧炉→LF精炼→VD真空脱气→连铸→加热→热轧→缓冷→集卷→检验→热轧线材→酸洗→磷化→粗拉→退火→精拉→镀铜→绕盘→包装入库。其中轧制工艺采用常规工艺，加热温度1100℃，热轧工序的终轧温度880℃，斯太尔摩风冷线的所有罩盖全关，增加退火工序用于消除组织中的马氏体。ER55-1 weather-resistant welding wire steel processing flow: molten iron and scrap → EAF electric arc furnace → LF refining → VD vacuum degassing → continuous casting → heating → hot rolling → slow cooling → coil collection → inspection → hot-rolled wire rod → pickling → phosphorus Chemical→rough drawing→annealing→fine drawing→copper plating→winding→packing and warehousing. The rolling process adopts the conventional process, the heating temperature is 1100°C, the final rolling temperature of the hot rolling process is 880°C, all the covers of the Steyrmore air-cooled line are fully closed, and the annealing process is added to eliminate the martensite in the structure.
检验实施例1-3及对比例1-2的ER55-1耐候焊丝钢力学面缩率、组织、热轧态的抗拉强度和拉拔断丝率，具体结果见表1。The ER55-1 weathering welding wire steel of Examples 1-3 and Comparative Example 1-2 was tested for mechanical area shrinkage, microstructure, hot-rolled tensile strength, and drawing wire breakage. The specific results are shown in Table 1.
表1 实施例及对比例的ER55-1耐候焊丝钢的检验结果Table 1 Test results of the ER55-1 weather-resistant welding wire steel of the embodiment and the comparative example
Figure PCTCN2020101764-appb-000001
Figure PCTCN2020101764-appb-000001
从表1可以看出，本发明所制得的耐候焊丝的力学面缩率大于65％，热轧态的抗拉强度范围为595～640MPa，金相组织为大量铁素体加少量粒状贝氏体，无马氏体组织，其拉拔断丝率明显降低，该轧制工艺无需退火工序即可完成材料的所有加工流程，制备的焊丝完全达到退火状态的质量水平。It can be seen from Table 1 that the mechanical area shrinkage of the weather-resistant welding wire prepared by the present invention is greater than 65%, the tensile strength of the hot-rolled state ranges from 595 to 640 MPa, and the metallographic structure is a large amount of ferrite plus a small amount of granular Bainite There is no martensitic structure, and the drawing wire breakage rate is significantly reduced. The rolling process can complete all the processing procedures of the material without the annealing process, and the prepared welding wire fully reaches the quality level of the annealed state.

Claims (5)

  1. 一种耐候桥梁用焊丝钢的轧制工艺，包括加热、热轧和缓冷工序，其特征在于：所述加热工序的加热温度控制在960～1000℃；所述热轧工序的终轧温度控制在805～835℃；所述缓冷工序的风冷线打开入口处的罩盖。A rolling process of welding wire steel for weather-resistant bridges, including heating, hot rolling and slow cooling processes, characterized in that: the heating temperature of the heating process is controlled at 960-1000°C; the final rolling temperature of the hot rolling process is controlled at 805-835°C; the air-cooling line of the slow cooling process opens the cover at the entrance.
  2. 根据权利要求1所述的一种耐候桥梁专用焊丝钢的轧制工艺，其特征在于：所述加热工序采用进三空一的进钢方式。The rolling process of special welding wire steel for weather-resistant bridges according to claim 1, characterized in that: the heating process adopts a three-air-one-in steel method.
  3. 根据权利要求2所述的一种耐候桥梁专用焊丝钢的轧制工艺，其特征在于：所述进三空一的进钢方式减少坯料在炉时间。The rolling process of special welding wire steel for weather-resistant bridges according to claim 2, characterized in that: the three-to-empty one-in-steel method reduces the time of the blank in the furnace.
  4. 根据权利要求1所述的一种耐候桥梁专用焊丝钢的轧制工艺，其特征在于：所述热轧工序在(α+γ)两相区轧制。The rolling process of special welding wire steel for weather-resistant bridges according to claim 1, wherein the hot rolling process is rolled in the (α+γ) two-phase region.
  5. 根据权利要求1所述的一种耐候桥梁专用焊丝钢的轧制工艺，其特征在于：所述缓冷工序的风冷线其余罩盖全关。The rolling process of special welding wire steel for weather-resistant bridges according to claim 1, wherein the remaining cover of the air-cooled line in the slow cooling process is fully closed.
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