KR20000044844A - Method of manufacturing high strength hot-rolled steel sheet excellent in galvanization - Google Patents
Method of manufacturing high strength hot-rolled steel sheet excellent in galvanization Download PDFInfo
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- KR20000044844A KR20000044844A KR1019980061344A KR19980061344A KR20000044844A KR 20000044844 A KR20000044844 A KR 20000044844A KR 1019980061344 A KR1019980061344 A KR 1019980061344A KR 19980061344 A KR19980061344 A KR 19980061344A KR 20000044844 A KR20000044844 A KR 20000044844A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 58
- 239000010959 steel Substances 0.000 title claims abstract description 57
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims abstract description 11
- 238000005096 rolling process Methods 0.000 claims abstract description 7
- 238000010276 construction Methods 0.000 claims description 13
- 229910052758 niobium Inorganic materials 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910052698 phosphorus Inorganic materials 0.000 claims description 4
- 230000009466 transformation Effects 0.000 claims description 4
- 238000005246 galvanizing Methods 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 description 7
- 238000007747 plating Methods 0.000 description 6
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- 238000004804 winding Methods 0.000 description 5
- 238000012733 comparative method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 229910000677 High-carbon steel Inorganic materials 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009415 formwork Methods 0.000 description 1
- 230000009036 growth inhibition Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B3/00—Rolling materials of special alloys so far as the composition of the alloy requires or permits special rolling methods or sequences ; Rolling of aluminium, copper, zinc or other non-ferrous metals
- B21B3/02—Rolling special iron alloys, e.g. stainless steel
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
-
- 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
- B21B1/22—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 plates, strips, bands or sheets of indefinite length
- B21B2001/225—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 plates, strips, bands or sheets of indefinite length by hot-rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B2015/0057—Coiling the rolled product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/02—Transverse dimensions
- B21B2261/04—Thickness, gauge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B2261/00—Product parameters
- B21B2261/20—Temperature
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Heat Treatment Of Steel (AREA)
- Coating With Molten Metal (AREA)
Abstract
Description
본 발명은 건물 건축시 거푸집용 지주대로 사용되는 아연도금성이 우수한 고강도 건축비계용 열연강판의 제조방법에 관한 것으로, 특히 건축비계용 강관의 인장강도를 70kh/㎟이상으로 고강도화 함과 아울러 사용가능 두께 또한 1.8∼2.3mm로 감소시킨 고강도 건축비계용 열연강판을 제조하고자 하는 것이다.The present invention relates to a method for manufacturing a high strength hot rolled steel sheet for construction scaffolding having excellent galvanizing properties used as a formwork for building construction, in particular, it can be used while increasing the tensile strength of steel pipes for construction scaffolding to 70kh / mm2 or more. The thickness is also to manufacture a high-strength hot rolled steel sheet for construction scaffold reduced to 1.8 ~ 2.3mm.
일반적으로 열간 압연강판을 제조하는 방법에 있어, 재질을 결정하는 주요 제조인자는 강의 성분 그리고 열간압연후의 압연출측온도 및 권취온도로 알려져 있다.In general, in the method of manufacturing a hot rolled steel sheet, the main manufacturing factors for determining the material are known as the steel component and the rolling exit temperature and winding temperature after hot rolling.
건축비계용으로 사용되고 있는 구조용 탄소강판의 제조는 0.15∼0.20wt%C-10.wt%Mn의 중 고탄소 성분계를 이용하여 통상 Ar3이상의 온도에서 열간압연을 마무리한후 550∼650℃온도범위에서 권취하는 경우가 있다. 이 경우 두께범위는 2.5mm로서 인장강도는 50kg/㎟수준이다.The production of structural carbon steel sheets used for construction scaffolding is usually performed at a temperature range of 550 to 650 ° C after finishing hot rolling at a temperature of Ar3 or higher using a medium-high carbon component system of 0.15 to 0.20 wt% C-10.wt% Mn. It may wind up. In this case, the thickness range is 2.5mm and the tensile strength is 50kg / mm2.
최근 일본 大和강관 및 신일본제철에서는 인장강도 70kg/㎟이상인 고강도 건축비계용 강판의 개발을 발표하였는데, 개발강의 화학성분은 0.18wt%C-0.16wt%C -1.47wt% Mn-0.04wt%Nb-0.05wt%V로 구성되어 있다.Recently, Japan's Daikan Steel Pipe and New Nippon Steel Co., Ltd. announced the development of high-strength construction scaffolds with a tensile strength of 70kg / mm2 or more. It consists of -0.05wt% V.
발표된 제조법의 특징을 보면 Nb 및 V의 첨가 목적은 고장력화를 위한 것이며, 탈산방법은 Al-Si복합탈산한 강이다. 개발강의 화학성분을 보면 실리콘(Si)이 0.16wt%정도 포함되어 있음을 알 수 있는데, 이는 건축비계용 강관의 소재 특성이 용융도금처리를 거쳐야 하는 산세강판임을 고려할 때 강판표면(scale층) 및 내부에 존재하는 실리콘의 영향은 용융도금특성에 크게 영향을 미칠 수 있다.In view of the characteristics of the published method, the purpose of adding Nb and V is to increase the tension, and the deoxidation method is Al-Si complex deoxidation steel. The chemical composition of the developed steel shows that the silicon (Si) contains about 0.16wt%, which is considered to be the pickling steel plate that needs to be subjected to the hot dip plating process. The influence of silicon present inside can greatly affect the hot dip plating properties.
따라서 실리콘의 첨가는 표면스케일, 용융도금난이성, 용접성등을 고려하면 가능한한 억제되어야 한다.Therefore, the addition of silicon should be suppressed as much as possible in consideration of surface scale, hot dip difficulty, and weldability.
본 발명은 상기의 문제점을 해소 하고자 발명한 것으로, 건축비계용 강관의 고강도화와 함께 사용두께의 감소를 통한 경량화를 실현하기 위하여 종래의 일반구조용 탄소강관에 비하여 인장강도를 약 20kg/㎟이상 향상시킨 두께 1.8∼2.3mm범위의 고강도 건축비계용강판을 제조함으로써, 난도금성 원소인 실리콘(Si)을 0.03wt%이하로 하여 인장강도 70kg/㎟, 항복강도,58kg/㎟이상의 박물 열연강판을 제조하고자 함에 그 목적이 있다.The present invention has been invented to solve the above problems, and in order to realize a light weight through the reduction of the use thickness along with the high strength of the construction scaffolding steel pipe to improve the tensile strength of about 20kg / ㎜ or more compared to the conventional carbon steel pipe By manufacturing high strength steel sheet for construction scaffolding in the range of 1.8 ~ 2.3mm thickness, to make hot rolled steel sheet with tensile strength of 70kg / mm2, yield strength, 58kg / mm2 or more The purpose is to.
본 발명은 고강도 건축비계용 열연강판을 제조하고자 주성분인 Fe에 C : 0.17∼0.23wt%, Si : 0.03wt%이하 Mn : 1.0∼1.6wt%, P : 0.04wt%이하, S : 0.005wt%이하, so｜-A｜: 0.02∼0.05wt%이하, Nb : 0.40∼0.045, V : 0.040∼0.045wt%를 함유하여 슬라브를 제조하고, 이를 이용하여 두께 1.8∼2.3mm의 열간압연강판으로 압연을 행할때에 사상압연온도를 Ar3변태점 이상으로 하고, 열간압연후 권취온도를 600∼650℃되도록 제어하여 항복강도 58kg/㎟ 이상의 재질특성을 가지는 아연도금성이 우수한 고강도 건축비계용 열연강판 제조한다The present invention is to produce a hot-rolled steel sheet for high-strength construction scaffolding Fe: 0.17 ~ 0.23wt%, Si: 0.03wt% or less Mn: 1.0 ~ 1.6wt%, P: 0.04wt% or less, S: 0.005wt% Hereinafter, a slab was prepared containing so | -A |: 0.02 to 0.05 wt% or less, Nb: 0.40 to 0.045, and V: 0.040 to 0.045 wt%, and rolled using a hot rolled steel sheet having a thickness of 1.8 to 2.3 mm using the slab. When hot rolling is performed, the filament rolling temperature is set to Ar3 transformation point or more, and the coiling temperature is controlled to be 600 ~ 650 ℃ after hot rolling.
이하 본 발명의 숫치 한정 이유를 설명하면 다음과 같다.Hereinafter, the reason for numerical limitation of the present invention will be described.
상기 C는 심가공용 열간압연 제조에 있어 적정 강도를 얻기 위한 관리범위를 준수하기 위하여 제한한 것으로서 0.23wt%를 초과하면 용접성이 저하된다.C is limited in order to comply with the management range for obtaining the appropriate strength in the hot rolling manufacturing for deep processing, when the weldability exceeds 0.23wt%.
상기 Mn은 고용강화원소로서 C과 더불어 강도를 확보하는데 유효할 뿐만 아니라 Ar3변태점을 저하시키기 때문에 혼립조직 방지에 유효한 원소로서 1.0∼1.6wt%범위로 제한하였다.Mn is effective in securing strength together with C as a solid solution strengthening element and lowers the Ar 3 transformation point, so it is limited to 1.0 to 1.6 wt% as an element effective for preventing the mixed structure.
또한 Si는 난도금성원소로서 강에 Si가 0.05wt%이상 함유시 용융도금에 있어 두꺼운 ZETA상의 도금층(매우 국부적인 OUTBURST 형태)발생으로 도금층의 취약성을 방지하기 위해서 0.03wt%이하로 제한 하였다.In addition, Si is a non-plating element, which is limited to 0.03wt% or less in order to prevent fragility of the plating layer due to the occurrence of a thick ZETA-plated layer (a very local OUTBURST type) in the hot-dip galvanizing when Si contains 0.05wt% or more.
상기 P,S는 강중 불순물로서 불가피하게 존재하나 통상의 규제치를 초과하면 연성에 악영향을 미치기 때문에 각각 0.03wt%, 0.02wt% 이하로 규제하였다.The P and S are inevitably present as impurities in the steel, but they exceed 0.03 wt% and 0.02 wt%, respectively.
상기 Al은 강의 탈산에 필요한 원소로서 통상의 경우 Sol-Al량이 0.04wt%이면 충분히 탈산되기 때문에 0.02∼0.05wt%로 규제하였다.Al is an element required for deoxidation of steel, and in general, since Al is sufficiently deoxidized when the amount of Sol-Al is 0.04 wt%, it is regulated to 0.02 to 0.05 wt%.
상기 Nb,V은 C,N등과 결합하여 석출 및 결정립성장 억제를 통한 결정립 미세화를 통해 강의 강도를 상승하기 위한 주요한 요소로 각각 0.04wt%이상을 규제하였다.Nb and V are combined with C and N to regulate 0.04 wt% or more as a major factor for increasing the strength of steel through grain refinement through precipitation and grain growth inhibition.
상기 사상압연온도는 Ar3변태점 이상을 위해 830℃이상으로 권취온도는 Nb,V석출물의 적절한 석출을 돕기 위해 최소 600℃이상으로 하고 권취후 입도 성장방해를 위해 최대 650℃로 규제한다.The filament rolling temperature is at least 830 ℃ for more than the Ar3 transformation point, the winding temperature is at least 600 ℃ to help the proper precipitation of Nb, V precipitates and regulated to a maximum of 650 ℃ to prevent grain growth after winding.
상기 600℃이하 이면 석출이되지 않고 650℃이상 이면 입도가 과도하게 성장한다.If the temperature is less than 600 ° C., no precipitation occurs, and if it is more than 650 ° C., the particle size grows excessively.
이하 본 발명을 실시예를 통하여 설명하면 다음과 같다.Hereinafter, the present invention will be described through Examples.
[실시예]EXAMPLE
본 발명에 이용한 강의 화학성분을 정리하여 하기 표 1에 나타내었다.The chemical composition of the steel used in the present invention is summarized in Table 1 below.
상기 강 A는 종래의 중 고탄소강이며, 강 B는 종래강에 실리콘(Si)을 0.03wt%이하, 몰리브덴(Mb)과, 바나듐(V)을 0.04wt%이상 첨가한 경우이다.The steel A is a conventional medium-high carbon steel, and the steel B is 0.03 wt% or less of silicon (Si), molybdenum (Mb), and 0.04 wt% or more of vanadium (V).
강 C,D,E는 각각 Nb 및 V 함유량을 나타내는 강으로서 강 C의 경우 Nb를 단독첨가한 것이고, 강 D는 V를 단독첨가한 강이며, 강 E는 Nb,V를 0.04wt% 미만 첨가한 강이다. 강 F는 실리콘(Si)을 0.05wt%이상 함유한 강이다.Steels C, D, and E represent Nb and V contents, respectively, in the case of steel C, Nb is added alone, steel D is added V alone, and steel E is added with less than 0.04 wt% of Nb and V. It is a river. Steel F is a steel containing 0.05 wt% or more of silicon (Si).
상기 성분계를 함유한 강 슬라브를 1200℃에서 3시간 재가열한후 열간압열을 행하여 두께 1.8mm의 열연강판을 제조하였으며, 이때 열간압연 마무리 목표온도는 온도는 870℃로 하여 처리되었고, 권취온도는 하기 표 2에 나타낸 바와 같이 600∼610℃범위로 하였다.After reheating the steel slab containing the component system at 1200 ° C. for 3 hours, hot rolling was performed to prepare a hot rolled steel sheet having a thickness of 1.8 mm. At this time, the hot rolling finish target temperature was treated at a temperature of 870 ° C., and the winding temperature was As shown in Table 2, it was in the range of 600-610 degreeC.
상기 제조된 열연강판의 기계적 성질은 JIS5호 인장시편을 이용하여 10mm/min의 인장속도로 인장하여 평가하였으며, 이때의 기계적성질은 상기 표 2에 나타낸 바와 같다.Mechanical properties of the prepared hot-rolled steel sheet was evaluated by pulling at a tensile speed of 10mm / min using a JIS No. 5 tensile test specimen, the mechanical properties are shown in Table 2 above.
종래의 중 고탄소강을 이용한 강 A의 경우 인장강도는 50kg/㎟정도이다.In the case of steel A using the conventional medium-high carbon steel, the tensile strength is about 50 kg / mm 2.
그러나 강 B의 본 발명강의 경우 상기의 강종에 비하여 인장강도가 약20kg/㎟정도 향상됨과 동시에 화학성분 중 Si의 함량도 0.03wtwt%이하임을 알 수 있다.However, in the case of the inventive steel of steel B, the tensile strength is improved by about 20 kg / mm 2 and the content of Si in the chemical composition is less than 0.03 wtwt% compared to the steel grade described above.
한편, Nb단독첨가강인 강 C강과 V단독첨가강인 D강은 인장강도가 미달됨을 알 수 있으며, Mb,V함량 각각이 0.04wt%미만인 E강종 또한 인장강도가 미달됨을 알 수 있다. 한편 강종 F는 인장강도는 만족하나 도금성이 불량함을 알수가 있다.Meanwhile, it can be seen that the steel C steel and the steel steel V, which are exclusively added to the Nb steel, and the steel D added to the steel, respectively, have insufficient tensile strength, and E steel having Mb and V contents of less than 0.04 wt%, respectively, also exhibited insufficient tensile strength. On the other hand, the steel grade F is satisfied with the tensile strength but poor plating properties.
따라서 본 발명의 고강도 건축비계용 열연강판을 제조함에 있어 C : 0.15∼0.23wt%, Si : 0.03wt%이하, Mn : 1.0∼1.6wt%, Nb > min.0.040wt%, V > min. 0.040wt%, P < max.0.03wt%, S < max.0.020wt%,so｜-A｜:0.02∼0.05wt%를 함유하는 슬라브를 이용하여 두게 1.8∼2.3mm의 열간압연후 권취온도를 610℃가 되도록 제어함으로서 인장강도 70kg/㎟이상의 재질특성을 가지는 심가공용 박물 열연강판이 제조됨을 알수 있다.Therefore, C: 0.15 ~ 0.23wt%, Si: 0.03wt% or less, Mn: 1.0 ~ 1.6wt%, Nb> min.0.040wt%, V> min. Using a slab containing 0.040wt%, P <max.0.03wt%, S <max.0.020wt%, so | -A |: 0.02-0.05wt%, the coiling temperature after hot rolling of 1.8-2.3mm It can be seen that by controlling the temperature to 610 ℃ to produce a hot-rolled steel sheet for deep processing has a material property of more than 70kg / ㎜ tensile strength.
이상과 같이 하여 제조된 본 발명의 고강도 건축비계용 열연강판의 실용화는 건축비계용 소재의 경량화를 통한 노동안정성, 운송효율화 및 생산비저감등의 실현을 이루었고, 종래 건축비계용 강관 대비 약 25%의 경량화를 실현하였다.The practical use of the high-strength construction scaffolding hot-rolled steel sheet of the present invention manufactured as described above achieved labor stability, transportation efficiency, and production cost reduction by lightening construction scaffolding material, and about 25% of steel pipe for construction scaffolding Achieved light weight.
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| KR101149121B1 (en) * | 2009-07-24 | 2012-05-25 | 현대제철 주식회사 | High strength hot rolled steel sheet and the method of producing the same |
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