KR100615685B1 - A flux cored wire with anti-hotcracking property for weather resistance steel - Google Patents

A flux cored wire with anti-hotcracking property for weather resistance steel Download PDF

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KR100615685B1
KR100615685B1 KR1020050057732A KR20050057732A KR100615685B1 KR 100615685 B1 KR100615685 B1 KR 100615685B1 KR 1020050057732 A KR1020050057732 A KR 1020050057732A KR 20050057732 A KR20050057732 A KR 20050057732A KR 100615685 B1 KR100615685 B1 KR 100615685B1
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weather resistance
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wire
weld metal
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Korean (ko)
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박상민
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현대종합금속 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
    • B23K35/0261—Rods, electrodes, wires
    • B23K35/0266—Rods, electrodes, wires flux-cored
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3053—Fe as the principal constituent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/40—Making wire or rods for soldering or welding
    • B23K35/406—Filled tubular wire or rods
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Nonmetallic Welding Materials (AREA)

Abstract

본 발명은 대기 노출시 우수한 내식성을 갖는 용접금속을 얻을 수 있는 플럭스 충전 와이어에 관한 것이다.The present invention relates to flux-filled wires capable of obtaining a weld metal having excellent corrosion resistance upon atmospheric exposure.

본 발명은, 와이어에 대한 중량%로, C: 0.010~0.055%, B: 0.002~0.010%, Al: 0.30% 미만, Ti: 2.5~6.5%, Mn: 0.5~2.5%, Mg: 0.1~1.0%, Si: 0.2~1.0%, Ni: 1.0~2.5%, Cu: 0.1~1.0%, Cr: 0.10% 이하, Mo: 0.15~0.50%, Na과 K의 1종 이상의 합: 0.05~1.25%, F: 0.05~0.15%, 나머지 Fe를 포함하여 조성되고, 상기 성분중 Ni, Mo, Cu, Si, Mn, Al 및 Mg의 함량이 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg) = 5.0~7.0을 만족하는 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어로 이루어진다.In the present invention, in terms of weight% of the wire, C: 0.010 to 0.055%, B: 0.002 to 0.010%, Al: less than 0.30%, Ti: 2.5 to 6.5%, Mn: 0.5 to 2.5%, Mg: 0.1 to 1.0 %, Si: 0.2% to 1.0%, Ni: 1.0% to 2.5%, Cu: 0.1% to 1.0%, Cr: 0.10% or less, Mo: 0.15% to 0.50%, at least one sum of Na and K: 0.05% to 1.25%, F: 0.05 ~ 0.15%, containing the remaining Fe, the content of Ni, Mo, Cu, Si, Mn, Al and Mg in the above components (Ni + 5 Mo + Cu) × (Si + Mn + Al + Mg ), Consisting of titania-based flux filled wire for weathering steel with excellent high temperature cracking resistance satisfying 5.0 ~ 7.0.

본 발명은 용접금속의 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어를 제공할 수 있다.The present invention can provide a titania-based flux-filled wire for the weather resistance steel excellent in high temperature crack resistance of the weld metal.

내후성, 플럭스 충전 와이어, 티타니아계, 고온균열, 용접금속 Weather Resistance, Flux Filled Wire, Titania-based, Hot Cracking, Welding Metal

Description

고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어{A flux cored wire with anti-hotcracking property for weather resistance steel}Titania-based flux-filled wire for beach weathering steel with excellent high temperature crack resistance {A flux cored wire with anti-hotcracking property for weather resistance steel}

본 발명은 대기 노출시 우수한 내식성을 갖는 용접금속을 얻을 수 있는 플럭스 충전 와이어에 관한 것으로, 보다 상세하게는 염분량이 높은 해안지대나 동결방지제인 염화칼슘 등이 살포되어 염소이온의 농도가 높은 부식환경하에서도 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어에 관한 것이다.The present invention relates to a flux-filled wire that can obtain a weld metal having excellent corrosion resistance when exposed to the atmosphere, and more particularly, in a corrosive environment having a high concentration of chlorine ions by spraying a coastal zone with a high salt content or calcium chloride as an antifreeze agent. The present invention relates to a titania-based flux filling wire for weatherproof steel having excellent high temperature crack resistance.

대기중에서 일반강에 비해 우수한 내식성을 갖는 용접재료의 개발에 이어 최근에는 염분량이 높은 해안지역이나 염화칼슘이 살포된 지역에서 내후성을 더욱 향상시키기 위한 노력이 진행중이며, 이미 여러종류의 재료가 제안되었다. 그 예로, Cr 함유량을 높인 재료(일본 공개특허공보 평6-99372호 공보, 평9-176790호), Ni 함유량을 높인 재료(일본 공개특허공보 평5-51668호), P 함유량을 높인 재료(일본 공개특허공보 평10-251797호) 및 Ca 같은 염기성 원소를 첨가한 재료(일본 공개특 허공보 평2-125839호, 평5-51668호)등이 제안되어 있다. 특히, Ca, Mg과 같은 염기성 원소를 첨가하여 강재표면의 pH를 높임으로써 내후성을 증가시키는 강재에서는, 강중 Ca계 비금속 개재물을 적절하게 제어함으로써 부식초기 강재표면의 pH를 증가시켜 도장이나 표면처리를 실시하지 않고서도 단기간에 안정녹을 형성할 수 있어, 해안지대나 염화칼슘이 살포되는 비래염분량이 높은 환경하에서 우수한 내후성을 확보하고 있다.Following the development of welding materials that have better corrosion resistance than ordinary steel in the air, efforts have recently been made to further improve weather resistance in coastal areas with high salt content or in areas where calcium chloride has been sprayed, and various kinds of materials have already been proposed. For example, the material which increased Cr content (Japanese Unexamined-Japanese-Patent No. 6-99372, 9-176790), the material which raised Ni content (Japanese Unexamined-Japanese-Patent No. 5-51668), and the material which raised P content ( Japanese Unexamined Patent Application Publication No. Hei 10-251797) and materials to which a basic element such as Ca is added (Japanese Patent Application Laid-Open No. Hei 2-125839, Hei 5-51668) and the like have been proposed. Particularly, in steels that increase weatherability by adding basic elements such as Ca and Mg to increase the pH of the steel surface, by appropriately controlling the Ca-based nonmetallic inclusions in the steel, the pH of the initial steel surface of the corrosion is increased to perform painting or surface treatment. It is possible to form stable rust in a short period of time without implementation, and excellent weather resistance is secured in coastal areas or in an environment where the amount of adjuvant salt to which calcium chloride is applied is high.

또한, 용접재료에 대한 종래기술로는 Cu, Cr, Ni 및 Mo의 조성을 적절히 조절한 용접재료(일본 공개특허공보 2002-336989호)가 제안되고 있다. 그러나, 상기 종래기술은 해변에서의 내후성 특성을 증가시키는 것은 가능하나, 고온에서 균열이 발생되는 등의 문제점을 가지고 있다.Further, as a conventional technique for welding materials, a welding material (Japanese Laid-Open Patent Publication No. 2002-336989) has been proposed in which the composition of Cu, Cr, Ni, and Mo is appropriately adjusted. However, the prior art is capable of increasing weather resistance at the beach, but has problems such as cracking at high temperatures.

본 발명은 상기 종래기술의 문제점을 해결하기 위한 것으로, 성분함량을 최적화하고, Ni, Mo, Cu와 더불어 Si, Mn, Al, Mg의 함량을 복합적으로 제어함으로써 용접금속의 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어를 제공하는데, 그 목적이 있다.The present invention is to solve the problems of the prior art, by optimizing the component content, by controlling the content of Si, Mn, Al, Mg in addition to Ni, Mo, Cu composite beaches excellent in high temperature crack resistance of the weld metal It is an object to provide a titania-based flux filling wire for weathering steel.

상기 목적을 달성하기 위한 본 발명은, 와이어에 대한 중량%로, C: 0.010~0.055%, B: 0.002~0.010%, Al: 0.30% 미만, Ti: 2.5~6.5%, Mn: 0.5~2.5%, Mg: 0.1~1.0%, Si: 0.2~1.0%, Ni: 1.0~2.5%, Cu: 0.1~1.0%, Cr: 0.10% 이하, Mo: 0.15~0.50%, Na과 K의 1종 이상의 합: 0.05~1.25%, F: 0.05~0.15%, 나머지 Fe를 포 함하여 조성되고,The present invention for achieving the above object, in the weight% of the wire, C: 0.010 ~ 0.055%, B: 0.002 ~ 0.010%, Al: less than 0.30%, Ti: 2.5 ~ 6.5%, Mn: 0.5 ~ 2.5% , Mg: 0.1 to 1.0%, Si: 0.2 to 1.0%, Ni: 1.0 to 2.5%, Cu: 0.1 to 1.0%, Cr: 0.10% or less, Mo: 0.15 to 0.50%, at least one sum of Na and K : 0.05 ~ 1.25%, F: 0.05 ~ 0.15%, including the remaining Fe,

상기 성분중 Ni, Mo, Cu, Si, Mn, Al 및 Mg의 함량이 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg) = 5.0~7.0을 만족하는 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어에 관한 것이다.Beach weather resistance with excellent high temperature cracking resistance in which the content of Ni, Mo, Cu, Si, Mn, Al, and Mg among the components satisfies (Ni + 5Mo + Cu) × (Si + Mn + Al + Mg) = 5.0 to 7.0 A steel titania flux filling wire.

이하, 본 발명을 상세하게 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

와이어에 대한 중량%로 C: 0.010~0.055%(이하, 단지 '%'로 기재함)% By weight of wire C: 0.010% to 0.055% (hereinafter referred to as '%' only)

상기 C는 본 발명의 와이어를 구성하는 강외피와 그에 충전된 플럭스의 조성물에 잔존하는 양으로써 통상 인위적으로 첨가하지는 않지만 용접금속의 기계적 성질에 영향을 주는 중요한 인자이므로 그 함량을 엄격하게 제한할 것이 요구된다. 이에 본 발명에서는 C를 와이어에 대한 중량%(이하, 단지 %라 한다)로 0.010-0.055% 범위로 함유함이 바람직한데, 그 이유는 상기 C가 0.010% 미만이면 용접금속의 인성 및 인장성능이 열화되고, 0.055%를 초과하면 용접과정에서의 흄과 스패터의 발생량이 증가하기 때문이다.The C is an amount remaining in the composition of the steel shell and the flux filled therein constituting the wire of the present invention is not usually added artificially but is an important factor affecting the mechanical properties of the weld metal, so its content should be strictly limited. Required. Therefore, in the present invention, it is preferable to contain C in the range of 0.010-0.055% by weight (hereinafter, simply referred to as%) of the wire, because the C toughness and tensile performance of the weld metal is less than 0.010%. This is because deterioration and the amount of fume and spatter generated in the welding process increase when it exceeds 0.055%.

B: 0.002~0.010%B: 0.002-0.010%

상기 B는 조직의 미세화와 더불어 인성을 증가시키는데 유효한 성분이기는 하나, 붕화물에 의해 결정입계에 분포되어 분리된 개재물로 형성되므로 균열원으로 작용할 수 있다. 상기 B의 함량이 0.002% 미만에서는 용접금속의 미세조직을 얻을 수 없고 인성강화 효과도 발휘되지 않으며, 0.010%를 초과하는 경우에는 붕화물이 연속적인 망상으로 형성되어 경화에 의한 충격치 감소가 일어나고, 인성도 열화될 뿐만 아니라 용융성 저하 및 고온균열이 발생할 수 있기 때문에, 그 함량을 0.002~0.010%로 제한하는 것이 바람직하다.Although B is an effective component to increase the toughness as well as the refinement of the tissue, it may be a crack source because it is formed as discrete inclusions distributed at grain boundaries by borides. If the content of B is less than 0.002%, the microstructure of the weld metal cannot be obtained and toughening effect is not exerted. If the content of B is greater than 0.010%, boride is formed into a continuous network to reduce the impact value due to hardening. In addition to the deterioration of toughness, the meltability and hot cracking may occur, it is preferable to limit the content to 0.002 ~ 0.010%.

Al: 0.30% 미만Al: less than 0.30%

상기 Al은 Mg과 같이 강탈산제로서 용접금속의 산소량을 저감시키고, 용접금속의 인성을 향상시키는데 유효한 성분이다. 그러나, 상기 Al의 함량이 0.30% 이상이면 용융금속중에 Al2O3를 형성하여 고온균열을 촉진시키며, Mg과 함께 아크중의 증기압을 과도하게 상승시켜 흄 발생을 증가시킬 수 있다. 따라서, 본 발명에서는 상기 Al의 함량을 0.30% 미만으로 제한하는 것이 바람직하다.Al, like Mg, is an effective component for reducing the oxygen content of the weld metal and improving the toughness of the weld metal as a strong deoxidizer. However, when the Al content is 0.30% or more, Al 2 O 3 is formed in the molten metal to promote high temperature cracking, and the fume generation may be increased by excessively increasing the vapor pressure in the arc with Mg. Therefore, in the present invention, it is preferable to limit the content of Al to less than 0.30%.

Ti: 2.5~6.5%Ti: 2.5 ~ 6.5%

상기 Ti은 티타늄 산화물로 사용되어 아크 안정성을 향상시키며, 슬래그 형성제로서 용접작업성을 향상시키는데 유효한 성분이다. 그러나, 상기 Ti의 첨가량이 2.5% 미만인 경우에는 용적의 표면장력을 감소시킴과 동시에 아크가 불안정하고 슬래그 형성도 부족해 비드 외관이 거칠어지는 반면에, 6.5%를 초과하면 슬래그 형성이 과다하고 용융성도 저하될 뿐만 아니라 유동성도 떨어지는 문제점이 있다. 따라서, 상기 Ti의 함량은 2.5~6.5%로 제한하는 것이 바람직하다.Ti is used as a titanium oxide to improve arc stability, and is an effective component for improving weldability as a slag forming agent. However, when the amount of Ti added is less than 2.5%, the surface tension of the volume is reduced and at the same time, the arc is unstable and the slag formation is insufficient, resulting in rough bead appearance, whereas when the Ti content exceeds 6.5%, the slag formation is excessive and the meltability is also decreased. In addition, there is a problem that the liquidity is also poor. Therefore, the content of Ti is preferably limited to 2.5 to 6.5%.

Mn: 0.5~2.5%Mn: 0.5 ~ 2.5%

상기 Mn은 합금의 상태로 첨가되며, 탈산 및 탈황제로 사용되어 S 편석에 의한 저융점 화합물의 형성을 방지하고 용접금속의 산소를 저감하여 용접금속의 건전성을 향상시키는데 유효한 성분이다. 상기 Mn의 함량이 0.5% 미만에서는 첨가에 따른 상기 효과를 기대할 수 없으며, 2.5%를 초과하면 아크 안정성과 용융성이 감소하고 강도가 증가하여 고온균열이 발생하기 쉽다. 따라서, 상기 Mn의 함량은 0.5~2.5%로 제한하는 것이 바람직하다.The Mn is added in the form of an alloy, and is used as a deoxidation and desulfurization agent to prevent the formation of low melting point compounds due to S segregation and to reduce the oxygen of the weld metal, thereby improving the integrity of the weld metal. If the content of Mn is less than 0.5%, the effect of the addition cannot be expected, and if it exceeds 2.5%, the arc stability and meltability decrease and the strength increases, so that hot cracking is likely to occur. Therefore, the content of Mn is preferably limited to 0.5 ~ 2.5%.

Mg: 0.1~1.0%Mg: 0.1 ~ 1.0%

상기 Mg는 합금의 형태로 첨가되며, 강탈산제이기 때문에 용접금속의 산소량을 저감하고 인성을 향상시키는데 유효한 성분이다. 상기 Mg의 첨가량이 0.1% 미만이면 탈산효과가 적으며, 1.0%를 초과하면 아크 안정성이 저하되고 스패터 발생량이 증가되어 용접작업성이 열화되는 문제점이 있다. 따라서, 상기 Mg의 첨가량은 0.1~1.0%로 제한하는 것이 바람직하다.The Mg is added in the form of an alloy, and is a strong deoxidizer, and thus is an effective component for reducing the amount of oxygen in the weld metal and improving toughness. If the amount of Mg added is less than 0.1%, the deoxidation effect is small. If the amount of Mg is exceeded 1.0%, there is a problem in that arc stability is lowered and spatter generation is increased to deteriorate welding workability. Therefore, the amount of Mg added is preferably limited to 0.1 to 1.0%.

Si: 0.2~1.0%Si: 0.2 ~ 1.0%

상기 Si는 슬래그 형성제로서 비드퍼짐성을 향상시키며, 탈산효과에 의한 용접금속의 건전성 향상에도 기여한다. 상기 Si의 첨가량이 0.2% 미만이면 첨가에 따른 상기 효과를 기대할 수 없으며, 1.0%를 초과하면 인성이 열화되는 문제점이 있으므로, 그 첨가량을 0.2~1.0%로 제한하는 것이 바람직하다.Si improves the bead spreadability as a slag forming agent and contributes to the improvement of the integrity of the weld metal by the deoxidation effect. If the addition amount of Si is less than 0.2%, the above effect according to the addition cannot be expected, and if it exceeds 1.0%, there is a problem that the toughness deteriorates, so it is preferable to limit the addition amount to 0.2 to 1.0%.

Ni: 1.0~2.5%Ni: 1.0-2.5%

상기 Ni는 내후성 향상에 기여하는 중요한 원소의 하나로서, Ni가 첨가되면 비정질 녹층이 미세화 및 치밀화되어 녹층을 통한 물질의 투과를 억제시키므로 내후성의 향상에 기여하고 특히 비래 염분량이 높은 해안지역에서의 내후성 향상에 효과적이다. 상기 Ni의 함량이 1.0% 미만이면 첨가에 따른 상기 효과를 얻을 수 없고, 2.5%를 초과하면 Ni함량을 증가시키더라도 내후성 향상이 미미하게 된다. 따라서, 상기 Ni의 함량은 1.0~2.5%로 제한하는 것이 바람직하다.Ni is one of the important elements contributing to the improvement of weather resistance, and when Ni is added, the amorphous rust layer becomes finer and densified, thereby inhibiting the permeation of the material through the rust layer, thereby contributing to the improvement of weather resistance, especially in coastal areas with high salt content. Effective for improvement If the content of Ni is less than 1.0%, the effect of the addition cannot be obtained. If the content of Ni is more than 2.5%, even if the Ni content is increased, the weather resistance improvement is insignificant. Therefore, the content of Ni is preferably limited to 1.0 to 2.5%.

Cu: 0.1~1.0%Cu: 0.1 ~ 1.0%

상기 Cu는 녹층입자의 미세화 및 치밀화를 유도하여 강의 내후성을 향상시키는데 유효한 성분이다. 상기 Cu의 함량이 0.1% 미만이면 내후성 향상 효과를 기대하기 어렵고, 1.0%를 초과하면 내후성 향상 효과가 포화된다. 따라서, 상기 Cu의 함량은 0.1~1.0%로 제한하는 것이 바람직하다.The Cu is an effective component to induce refinement and densification of rust layer particles and to improve weather resistance of steel. If the content of Cu is less than 0.1%, it is difficult to expect a weather resistance improving effect, and if it exceeds 1.0%, the weather resistance improving effect is saturated. Therefore, the content of Cu is preferably limited to 0.1 ~ 1.0%.

Cr: 0.10% 이하Cr: 0.10% or less

상기 Cr은 일반적으로 내후성에 기여하는 원소로 알려져 있으나, 고비래성 염분 환경에서는 오히려 용접금속의 내후성을 저해시키는 것으로 나타나 본 발명에서는 그 함량을 0.10% 이하로 제한하는 것이 바람직하다.The Cr is generally known as an element contributing to weather resistance, but in a highly anti-salt salt environment, it appears to inhibit the weather resistance of the weld metal. Therefore, in the present invention, the content is preferably limited to 0.10% or less.

Mo: 0.15~0.50%Mo: 0.15 ~ 0.50%

상기 Mo는 수용액내에서 MoO4 2-이온을 형성하여 염소이온의 투과를 억제시킴으로써 해변 내후성을 향상시킬 뿐만 아니라 강도 향상에도 유효한 성분이다. 상기 Mo의 함량이 0.15% 미만이면 첨가에 따른 상기 효과를 얻을 수 없고, 0.50%를 초과하면 용접금속이 과도하게 경화되어 고온균열에 취약하게 되는 문제점이 있다. 따라서, 본 발명에서는 상기 Mo의 함량을 0.15~0.50%로 제한하는 것이 바람직하다.Mo is a component effective in improving strength as well as improving weather resistance by forming MoO 4 2- ions in aqueous solution to suppress permeation of chlorine ions. If the content of Mo is less than 0.15%, the effect of the addition may not be obtained. If the content of Mo exceeds 0.50%, the weld metal may be excessively hardened, and thus may be vulnerable to high temperature cracking. Therefore, in the present invention, it is preferable to limit the content of Mo to 0.15 ~ 0.50%.

Na와 K의 1종 이상의 합: 0.05~1.25%Sum of one or more of Na and K: 0.05-1.25%

상기 Na와 K는 아크 안정제로서, 그 첨가량의 합이 0.05% 미만이면 아크 안정제로서의 효과가 부족하여 용융성 저하에 따른 스패터 발생량이 증가하고, 1.25%를 초과하면 아크 집중이 과다하거나 아크 형태가 불안하여 비드 외관을 해치기 쉽다. 따라서, 상기 Na와 K의 1종 이상의 합은 0.05~1.25%로 제한하는 것이 바람직하다.Na and K are arc stabilizers. If the sum of the added amounts is less than 0.05%, the effect as an arc stabilizer is insufficient, and the amount of spatter generated due to the decrease in meltability is increased. Anxious to damage the bead appearance. Therefore, it is preferable to limit the sum of one or more of Na and K to 0.05 to 1.25%.

F: 0.05~0.15%F: 0.05 ~ 0.15%

상기 F는 아크 안정을 도와주는 역할과 함께 탈수소 효과를 갖는다. 상기 F의 첨가량이 0.05% 미만이면 첨가에 따른 상기 효과를 얻을 수 없고, 0.15%를 초과하면 용접과정에서 증기압이 높기 때문에 흄 발생량이 증가하므로, 그 첨가량을 0.05-0.15%로 제한하는 것이 바람직하다.The F has a dehydrogenating effect together with a role of assisting the arc stabilization. If the addition amount of F is less than 0.05%, the effect of the addition cannot be obtained. If the addition amount is more than 0.15%, the amount of fume is increased because of the high vapor pressure during the welding process, and therefore it is preferable to limit the addition amount to 0.05-0.15%. .

상기 성분중 Ni, Mo, Cu는 용접금속의 내후성을 증가시키는 성분이기는 하나, 용접금속을 경화시켜 용접과정에서 고온균열의 발생 가능성을 증가시키게 된다. 따라서 본 발명자는 이러한 Ni, Mo, Cu에 의한 고온균열 발생 가능성을 감소시키기 위하여 연구와 실험을 거듭하였으며, 그 결과 플럭스 충전 와이어의 합금성분 함량을 최적화함과 아울러 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg)가 5.0-7.0이 되도록 제어함으로써 고온균열 저항성을 향상시킬 수 있음을 확인하였다. 상기 식의 값이 5.0 미만이면 용접과정에서 탈산력이 부족하여 용접금속의 기계적 성능이 저하되거나 용접금속의 내부식성 향상에 기여하는 합금의 이행이 부족하여 내부식성이 저하되고, 7.0을 초과하면 탈산력과 내부식성을 부여하는 합금이 용접금속에 과도하게 이행되어 용접금속을 급격하게 경화시킴으로서 용접금속이 용융후 냉각되는 과정에서 고온균열 발생을 초래하는 문제점이 있다.Ni, Mo, Cu of the above components are components that increase the weather resistance of the weld metal, but harden the weld metal to increase the possibility of high temperature cracking during the welding process. Therefore, the present inventors conducted research and experiments to reduce the possibility of high temperature cracking caused by Ni, Mo, and Cu, and as a result, while optimizing the content of the alloy component of the flux-filled wire, (Ni + 5Mo + Cu) × ( It was confirmed that the high temperature crack resistance can be improved by controlling Si + Mn + Al + Mg) to 5.0-7.0. If the value of the above formula is less than 5.0, the deoxidation force is insufficient in the welding process, so that the mechanical performance of the weld metal is degraded or the alloy lacks the transition of the alloy, which contributes to the improvement of the corrosion resistance of the weld metal. The alloy imparting strength and corrosion resistance is excessively transferred to the weld metal, thereby rapidly hardening the weld metal, thereby causing a high temperature crack in the process of cooling the weld metal after melting.

이하, 실시예를 통하여 본 발명을 상세하게 설명하나, 이는 본 발명의 바람직한 일실시예일뿐 본 발명의 범위가 이러한 실시예의 기재범위에 의하여 제한되는 것은 아니다.Hereinafter, the present invention will be described in detail by way of examples, which are only preferred embodiments of the present invention, but the scope of the present invention is not limited by the description of these embodiments.

[실시예]EXAMPLE

하기 표 1과 같은 조성을 갖는 직경 1.2mm의 티타니아계 플럭스 충전 와이어를 마련하였다. 상기와 같이 마련된 플럭스 충전 와이어들을 이용하여 하기 표 2와 같은 용접조건으로 두께 25mm의 AH-36 용접모재를 용접기 SCH500DC(+)를 사용하여 편면용접하였으며, 그 용접에 따른 고온균열발생 정도 등을 측정하여 하기 표 3에 나타내었다.A titania-based flux filling wire having a diameter of 1.2 mm having a composition as shown in Table 1 was prepared. Using the flux-filled wires prepared as described above, AH-36 welded base material having a thickness of 25 mm was welded on a single side using a welding machine SCH500DC (+) under the welding conditions as shown in Table 2 below, and the degree of high temperature cracking caused by the welding was measured. It is shown in Table 3 below.

본 실시예에서는 고온용접균열 길이 판정방법으로 먼저 하기 표 2와 같은 용접조건에 따라 세라믹 백킹제를 이용하여 용접모재에 편면 초층용접을 실시하고, 그 이후 용접비드 표면에 발생한 균열의 길이를 전체 용접길이(300mm)에 대한 백분율로 계산하여 그 수치가 3.0 이하인 경우를 양호한 것으로 판정하였다. 또한, 아크 안정성과 비드 형상을 육안으로 관찰하였으며, 그 결과를 매우우수(◎), 우수(○), 보통(△) 및 불량(×)으로 각각 구분하여 나타내었다.In the present embodiment, the high temperature welding crack length determination method first performs a one-sided superlayer welding on the welding base material using a ceramic backing agent according to the welding conditions as shown in Table 2 below, and then welds the entire length of the crack generated on the weld bead surface. It calculated as a percentage with respect to length (300 mm), and the case where the numerical value is 3.0 or less was judged as favorable. In addition, the arc stability and the shape of the beads were visually observed, and the results were divided into very good (◎), good (○), normal (△), and poor (×), respectively.

Figure 112005035359307-pat00001
Figure 112005035359307-pat00001

용접전류 및 전압Welding current and voltage 보호가스 및 유량Protective gas and flow rate 개선각도Angle of improvement 용접방법welding method 루트폭Root width 스틱아웃 (stick out)Stick out 250A 32V250 A 32 V CO2 20ℓ/분CO 2 20ℓ / min 40도40 degrees 하향후퇴법 (15~30도)Downward Retraction Method (15 ~ 30 Degrees) 6mm6 mm 20~25mm20-25mm

구분division 식값Expression 균열발생율 (%)Cracking rate (%) 아크안정성Arc stability 비드형상Bead shape 비고Remarks 발명예1Inventive Example 1 6.806.80 00 ◎◎ ◎◎ -- 발명예2Inventive Example 2 5.895.89 00 ◎◎ ◎◎ -- 발명예3Inventive Example 3 6.816.81 00 ◎◎ ○○ -- 발명예4Inventive Example 4 6.816.81 00 ◎◎ ◎◎ -- 발명예5Inventive Example 5 6.696.69 00 ◎◎ ◎◎ -- 발명예6Inventive Example 6 6.246.24 00 ○○ ◎◎ -- 발명예7Inventive Example 7 5.935.93 00 ◎◎ ◎◎ -- 발명예8Inventive Example 8 6.946.94 2.02.0 ◎◎ ◎◎ -- 발명예9Inventive Example 9 6.726.72 2.52.5 ◎◎ ◎◎ -- 발명예10Inventive Example 10 5.275.27 00 ◎◎ ◎◎ -- 비교예1Comparative Example 1 7.807.80 7.17.1 ◎◎ ◎◎ -- 비교예2Comparative Example 2 8.488.48 10.610.6 ◎◎ ○○ -- 비교예3Comparative Example 3 8.078.07 8.88.8 ◎◎ ◎◎ -- 비교예4Comparative Example 4 9.309.30 11.511.5 ◎◎ ○○ -- 비교예5Comparative Example 5 10.1610.16 20.020.0 ◎◎ ◎◎ -- 비교예6Comparative Example 6 9.679.67 18.618.6 ○○ ◎◎ -- 비교예7Comparative Example 7 9.059.05 13.513.5 ◎◎ ◎◎ -- 비교예8Comparative Example 8 7.417.41 6.16.1 ◎◎ ◎◎ -- 비교예9Comparative Example 9 10.6910.69 15.915.9 ◎◎ ◎◎ -- 비교예10Comparative Example 10 9.959.95 23.123.1 ◎◎ ◎◎ -- 비교예11Comparative Example 11 6.776.77 00 ×× ×× 유동성 저하Lower liquidity 비교예12Comparative Example 12 6.226.22 00 ×× △△ 용융성 저하Reduced meltability 비교예13Comparative Example 13 6.816.81 1.21.2 △△ ×× 유동성 저하Lower liquidity 비교예14Comparative Example 14 6.376.37 00 △△ ×× 유동성 저하Lower liquidity - 상기 식값은 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg)을 계산한 값임-The formula is calculated by calculating (Ni + 5 Mo + Cu) x (Si + Mn + Al + Mg)

상기 표 3으로부터 알 수 있는 바와 같이, 본 발명의 성분범위를 만족하고 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg)의 값이 5.0~7.0을 만족하는 발명예(1~10)는 고온균열 발생율이 현저하게 감소되었다.As can be seen from Table 3, the invention examples satisfying the component range of the present invention (Ni + 5 Mo + Cu) × (Si + Mn + Al + Mg) value of 5.0 to 7.0 (1 to 10) ), The incidence of high temperature cracking was significantly reduced.

그러나, 성분범위는 본 발명의 범위를 만족하나 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg)값이 본 발명의 범위를 만족하지 않는 비교예(1~10)는 고온균열 발생율이 높게 나타났다.However, although the component range satisfies the scope of the present invention, Comparative Examples (1 to 10) in which (Ni + 5Mo + Cu) × (Si + Mn + Al + Mg) values do not satisfy the scope of the present invention have a high temperature cracking incidence rate. Appeared high.

또한, 성분범위가 본 발명의 범위를 만족하지 않는 비교예(11~14)는 아크 안정성, 비드 외관이 좋지 않음을 알수 있다.In addition, it can be seen that the comparative examples (11 to 14) in which the component range does not satisfy the scope of the present invention are poor in arc stability and appearance of beads.

상술한 바와 같이, 본 발명에 따르면 와이어 성분함량을 최적화하고, Ni, Mo, Cu와 더불어 Si, Mn, Al, Mg의 함량을 복합적으로 제어함으로써 용접금속의 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어를 제공할 수 있다. As described above, according to the present invention, a titania-based steel for beach weathering steel having excellent high temperature crack resistance of weld metal by optimizing the content of wire components and controlling the contents of Si, Mn, Al, and Mg in combination with Ni, Mo, and Cu. Flux filling wire may be provided.

Claims (1)

와이어에 대한 중량%로, C: 0.010~0.055%, B: 0.002~0.010%, Al: 0.30% 미만, Ti: 2.5~6.5%, Mn: 0.5~2.5%, Mg: 0.1~1.0%, Si: 0.2~1.0%, Ni: 1.0~2.5%, Cu: 0.1~1.0%, Cr: 0.10% 이하, Mo: 0.15~0.50%, Na과 K의 1종 이상의 합: 0.05~1.25%, F: 0.05~0.15%, 나머지 Fe를 포함하여 조성되고,By weight relative to wire, C: 0.010 to 0.055%, B: 0.002 to 0.010%, Al: less than 0.30%, Ti: 2.5 to 6.5%, Mn: 0.5 to 2.5%, Mg: 0.1 to 1.0%, Si: 0.2 to 1.0%, Ni: 1.0 to 2.5%, Cu: 0.1 to 1.0%, Cr: 0.10% or less, Mo: 0.15 to 0.50%, at least one sum of Na and K: 0.05 to 1.25%, F: 0.05 to 0.15%, including the remaining Fe, 상기 성분중 Ni, Mo, Cu, Si, Mn, Al, Mg의 함량이 (Ni+5Mo+Cu)×(Si+Mn+Al+Mg) = 5.0~7.0을 만족하는 고온균열 저항성이 우수한 해변 내후성강용 티타니아계 플럭스 충전 와이어.Beach weather resistance with excellent high temperature cracking resistance at which the content of Ni, Mo, Cu, Si, Mn, Al, Mg in the above components satisfies (Ni + 5Mo + Cu) × (Si + Mn + Al + Mg) = 5.0 to 7.0 Steel titania flux filling wire.
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CN102398125A (en) * 2010-08-10 2012-04-04 株式会社神户制钢所 Titanium Oxide Raw Material For Weld Material, Weld Material Using Same, And Method For Producing Titanium Oxide Raw Material For Weld Material
CN105081609A (en) * 2015-09-22 2015-11-25 机械科学研究院哈尔滨焊接研究所 High-strength and high-toughness all-position-welding gas shield flux-cored wire for weather-resistant steel
CN115297993A (en) * 2020-03-31 2022-11-04 Ma铝株式会社 Aluminium soldering sheet for soldering without welding flux

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JP2003103399A (en) 2001-09-27 2003-04-08 Nippon Steel & Sumikin Welding Co Ltd Flux-filled wire for welding weather resistant steel
JP2003112287A (en) 2001-10-03 2003-04-15 Nippon Steel & Sumikin Welding Co Ltd Flux cored wire for welding seashore weather resistant steel
KR100505918B1 (en) 2000-12-01 2005-08-04 현대종합금속 주식회사 Titania type flux cored wire suitable for dual shielding gas

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JPH06285672A (en) * 1993-03-31 1994-10-11 Kobe Steel Ltd Flux cored wire of titania base for gas-shielded arc welding
KR100505918B1 (en) 2000-12-01 2005-08-04 현대종합금속 주식회사 Titania type flux cored wire suitable for dual shielding gas
JP2003103399A (en) 2001-09-27 2003-04-08 Nippon Steel & Sumikin Welding Co Ltd Flux-filled wire for welding weather resistant steel
JP2003112287A (en) 2001-10-03 2003-04-15 Nippon Steel & Sumikin Welding Co Ltd Flux cored wire for welding seashore weather resistant steel

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102398125A (en) * 2010-08-10 2012-04-04 株式会社神户制钢所 Titanium Oxide Raw Material For Weld Material, Weld Material Using Same, And Method For Producing Titanium Oxide Raw Material For Weld Material
KR101302941B1 (en) 2010-08-10 2013-09-06 가부시키가이샤 고베 세이코쇼 Titanium oxide raw material for weld material, weld material using same, and method for producing titanium oxide raw material for weld material
CN102398125B (en) * 2010-08-10 2014-08-20 株式会社神户制钢所 Titanium Oxide Raw Material For Weld Material, Weld Material Using Same, And Method For Producing Titanium Oxide Raw Material For Weld Material
CN105081609A (en) * 2015-09-22 2015-11-25 机械科学研究院哈尔滨焊接研究所 High-strength and high-toughness all-position-welding gas shield flux-cored wire for weather-resistant steel
CN115297993A (en) * 2020-03-31 2022-11-04 Ma铝株式会社 Aluminium soldering sheet for soldering without welding flux
CN115297993B (en) * 2020-03-31 2023-08-22 Ma铝株式会社 Aluminum brazing sheet for fluxless brazing
US11806816B2 (en) 2020-03-31 2023-11-07 Ma Aluminum Corporation Aluminum brazing sheet for fluxless brazing use

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