CN106425164A - High-strength steel electrode used for minus 50 DEG C low temperature spherical tank - Google Patents

High-strength steel electrode used for minus 50 DEG C low temperature spherical tank Download PDF

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Publication number
CN106425164A
CN106425164A CN201611163875.9A CN201611163875A CN106425164A CN 106425164 A CN106425164 A CN 106425164A CN 201611163875 A CN201611163875 A CN 201611163875A CN 106425164 A CN106425164 A CN 106425164A
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China
Prior art keywords
deposited metal
welding
low temperature
minus
strength steel
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Application number
CN201611163875.9A
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Chinese (zh)
Inventor
蔡鸿祥
陈国栋
王登峰
程浩
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KUNSHAN GINTUNE WELDING CO Ltd
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KUNSHAN GINTUNE WELDING CO Ltd
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Priority to CN201611163875.9A priority Critical patent/CN106425164A/en
Publication of CN106425164A publication Critical patent/CN106425164A/en
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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
    • B23K35/22—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
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
    • B23K35/3602—Carbonates, basic oxides or hydroxides
    • 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
    • B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
    • B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials

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

Abstract

The invention provides a high-strength steel electrode used for a minus 50 DEG C low temperature spherical tank. According to the high-strength steel electrode, a CaO-TiO2-CaF2 slag system formula is adopted, and microcrystalline alloying elements are added into a deposited metal on the basis of 2.5% Ni, so that the welding technology property of the electrode is good, when welded under a heat input of 30-40 KJ/cm and under a heat treatment condition of 580 DEG C*4 h, the deposited metal has tensile strength Rm of 630 MPA or above, minus 60 DEG C KV2 is 60 J or above, and the welded joint of the deposited metal has the tensile strength Rm of 610 MPa or above, minus 50 DEG C KV2 is 70 J or above, therefore, the high-strength steel electrode is very applicable to weld and construction of the minus 50 DEG C low temperature ethylene/propylene spherical tank.

Description

A kind of -50 DEG C of low temperature spherical tank high-strength steel electrodes
Technical field
The present invention relates to field of welding material is and in particular to a kind of -50 DEG C of low temperature spherical tank high-strength steel electrodes.
Background technology
- 50 DEG C of low temperature spherical tanks are the crucial storage devices of ethylene/propene device, because design pressure is high, temperature is low, inflammable Explosive, technical requirement is high, and the standard of construction of low temperature ethylene/Propylene Spherical Tanks substantially represent a country spherical tank The top level built.
At the beginning of 21 century, with the lifting of China's iron and steel level, in the big ethylene project of Plant of Tianjin Petrochemical Company, -50 DEG C low within 2008 Warm ethylene/propene spherical tank instead of import Japan JFE-HITEN610U2L steel plate using domestic 07MnNiMoDR steel plate.But 07MnNiMoDR Steel Spherical Tank supporting use welding rod, due to being limited by domestic welding material factory level, up to the present still relies on Import day Benshen's steel LB-65L welding rod, and at home by Dalian one agency's simple monopoly, import price is high, the cycle is long, Cause spherical tank cost high, the duration is also completely under one's control.Therefore exploitation has the 07MnNiMoDR of independent intellectual property right as early as possible - 50 DEG C of low temperature spherical tanks of steel are imperative with welding rod.
While studying with domestic 07MnNiMoDR steel plate, some famous welding material producers domestic have been also carried out joining The research and development of set welding rod, but cannot be welded with larger heat input, and after long heat treatment, low-temperature impact toughness is all paid no attention to Think, especially under vertical position of welding, weld metal can not meet the technical requirements of -50 DEG C of KV2 >=47J.
Content of the invention
For problem above, the invention provides a kind of -50 DEG C of low temperature spherical tank welding rods, it is resistant to long heat treatment, can High heat-input amount is welded, and using CaO-TiO2-CaF2 slag system formula, on the basis of deposited metal 2.5%Ni, with the addition of micro conjunction again Gold element, welding rod welding procedure is functional, welding, the heat treatment condition of 580 DEG C of * 4h under the heat input of 30-35KJ/cm Lower deposited metal tensile strength Rm >=630MPa, -60 DEG C of KV2 >=60J, its welding point tensile strength Rm >=610MPa, -50 DEG C KV2 >=70J, meets technical requirements.
For reaching above-mentioned purpose, the technical scheme is that：A kind of -50 DEG C of low temperature spherical tank high-strength steel electrodes, bag Include core wire and coating, coating is coated on core wire outer wall, described coating accounts for the 50%～60% of welding rod gross weight；
On the basis of core wire gross weight, by weight percentage, the component of described core wire is as follows：
C Mn Si P S Fe
≤0.10 0.35-0.60 ≤0.03 ≤0.015 ≤0.015 Surplus
On the basis of coating gross weight, by weight percentage, the component of described coating includes：
The percentage by weight of the deposited metal composition that a kind of described -50 DEG C of low temperature spherical tanks are formed with high-strength steel electrode For：
In welding rod, Calcium Carbonate primarily serves the purpose of slag making and gas making.When calcium carbonate content is relatively low, the gas making of coating and making Slag ability declines, and the protective effect to weld seam reduces, and causes weld properties to decline；If the too high levels of Calcium Carbonate, medicine Skin gas making amount is excessive, and arc stability declines, and splashes and increases, and welding slag fusing point raises, and appearance of weld is coarse.Calcium Carbonate in the present invention Overall control 28～40%.
Calcium fluoride can reduce the surface tension of liquid metal, improves its mobility so that appearance of weld is attractive in appearance, reduces weldering Slit becomes the defect of pore.Calcium Fluoride Content is low so that appearance of weld is bad, easy venthole in weld seam, and Calcium Fluoride Content is too high, It is easily destroyed arc stability, so that usability of electrode is deteriorated.In welding rod of the present invention, the content of fluoride is 12～20%.
The addition of rutile can make welding arc stablility, and molten bath is tranquil, so that transition molten drop is refined, appearance of weld is attractive in appearance, Slag covers, but is excessively used and easily makes mechanical performance degradation, therefore its content controls 4～8%.
Silicon dioxide, as slag former, can increase the activity of slag, but be excessively used and can increase splashing, and its content controls 5～8%.
In deposited metal, the selection reason of each element content is as follows：
Ferrosilicon is a kind of deoxidizer, and for ensureing deoxidation effect, in deposited metal, Si content should be not less than 0.1%.Si simultaneously There is solution strengthening effect, the intensity of deposited metal can be improved, but impact toughness decreased can be made, particularly when Si is more than When 0.4%, impact toughness decreased.The present invention is to realize superior technique effect, and in deposited metal, Si content is set to 0.15- 0.30%.
Electrolytic manganese is mainly used in improving deposited metal intensity, also functions to the effect of deoxidation and desulfurization, in deposited metal simultaneously Mn content designs between 0.80%-1.20%, thus matching it is ensured that welding with scope of design 2.00%-2.75% of Ni The toughness of joint is preferable.
Nikel powder is the essential element improving Toughness of Deposited Metal, with the increase of Ni content in deposited metal, deposited metal Toughness is gradually increasing, and as Ni ＞ 2.0%, impact flexibility significantly improves, but when Ni content is more than 2.75%, Ni no longer has Improve the effect of toughness, impact flexibility is decreased obviously on the contrary.
Molybdenum-iron is the element improving deposited metal intensity, is characterized in when Mo content is relatively low, with the increase of Mo content, Impact toughness decreased amplitude less, when Mo content increase to a certain extent when, impact flexibility is decreased obviously, therefore the conjunction of Mo content Suitable scope should be between 0.10～0.30%.
The beneficial effects of the present invention is：
(1) welding rod of the present invention adopts CaO-TiO2-CaF2 slag system, and processing performance is excellent, and arc burning is stable, deflection and blowing Preferably, splash power little, good fluidity, and appearance of weld is attractive in appearance, and it is easy that postwelding takes off slag；
(2) welding rod can be suitably used for all-position welding；
(3) electrode coating moisture content ＜ 0.15%, deposited metal diffusible hydrogen content ＜ 5ml/100g (mercury process), can be effective Reduce the appearance of cold crack；
(4) resistance to long heat treatment, welding rod deposited metal under the heat treatment condition of 580 DEG C × 4h tensile strength Rm >= 630MPa, -60 DEG C of KV2 >=60J, its welding point tensile strength Rm >=610MPa under the heat treatment condition of 580 DEG C × 4h, - 50 DEG C of KV2 >=70J, meet demand of technical standard；
(5) welding rod of the present invention adapts to the high heat-input amount welding of vertical position of welding especially, reaches 40kJ/cm's in heat input Under the conditions of, the mechanical property of welding point can also be ensured and be had more than needed, and this point is that current similar products at home and abroad is reached Less than.
The present invention adopts CaO-TiO2-CaF2 slag system formula, on the basis of deposited metal 2.5%Ni, with the addition of micro conjunction again Gold element, welding rod welding procedure is functional, and processing performance is excellent, and arc burning is stable, and deflection and blowing force preferably, are splashed little, Good fluidity, appearance of weld is attractive in appearance, and it is easy that postwelding takes off slag.Welding, 580 DEG C × 4h under the heat input of 30-40KJ/cm Deposited metal tensile strength Rm >=630MPa under heat treatment condition, -60 DEG C of KV2 >=60J, its welding point tensile strength Rm >= 610MPa, -50 DEG C of KV2 >=70J, are particularly well-suited to welding and the construction of -50 DEG C of low temperature ethylene/Propylene Spherical Tanks.
Specific embodiment
With reference to specific embodiment, technical scheme is further described, but the present invention is not limited to this A little embodiments.
Embodiment 1,
Using general manufacturing process in welding rod production industry, to select core wire by core wire component requirements, by coating raw material Prepared in proportion and prepared electrode coating by wet mixing is dry mixed, electrode coating is coated on core wire, is allowed to molding.Weldering Core component is shown in Table 1-1, and compositions of surfacing metal is shown in Table 1-2.
Table 1-1 core wire composition (unit：Percentage by weight)
C Si Mn P S Fe
0.062 0.022 0.477 0.011 0.005 Surplus
Table 1-2 coating recipe (unit：Percentage by weight)
The welding rod made is detected, before soldering test, welding rod first carries out 350-380 DEG C of baking 1 hour, welding rule Model：Using DC reverse connection, deposited metal mechanics adopts downhand welding, and its road temperature is 150-160 DEG C, and heat input is 15-20KJ/cm； Weld joint mechanical adopts vertical position welding, and its road temperature is 150-160 DEG C, and heat input is 30-35KJ/cm.Chemical property adopts spark Atomic Emission Spectrometer AES is tested, and mechanical property is tested using cupping machine, cryostat, shock machine, diffusion Hydrogen is tested using gas chromatogram diffusion hydrogen analyzer.Its deposited metal composition is shown in Table 1-3, deposited metal mechanical property It is shown in Table 1-4, welding joint mechanical property is shown in Table 1-5, diffusible hydrogen content is shown in Table 1-6, the mensure of wherein diffusible hydrogen adopts mercury process, Test three is averaged：
Chemical composition (the unit of table 1-3 deposited metal：The percentage ratio of welding rod weight)
C Mn Si P S Ni Mo Fe
0.059 1.03 0.19 0.010 0.005 2.49 0.20 Surplus
The mechanical property of table 1-4 deposited metal
The mechanical property of table 1-5 welding point
Table 1-6 deposited metal diffusible hydrogen content
Embodiment 2
Using general manufacturing process in welding rod production industry, to select core wire by core wire component requirements, by coating raw material Prepared in proportion and prepared electrode coating by wet mixing is dry mixed, electrode coating is coated on core wire, is allowed to molding.Weldering Core component is shown in Table 2-1, and compositions of surfacing metal is shown in Table 2-2.
Table 2-1 core wire composition (unit：Percentage by weight)
C Si Mn P S Fe
0.058 0.025 0.484 0.010 0.004 Surplus
Table 2-2 coating recipe (unit：Percentage by weight)
The welding rod made is detected, before soldering test, welding rod first carries out 350-380 DEG C of baking 1 hour, welding rule Model：Using DC reverse connection, deposited metal mechanics adopts downhand welding, and its road temperature is 150-160 DEG C, and heat input is 15-20KJ/cm； Weld joint mechanical adopts vertical position welding, and its road temperature is 150-160 DEG C, and heat input is 30-35KJ/cm.Chemical property adopts spark Atomic Emission Spectrometer AES is tested, and mechanical property is tested using cupping machine, cryostat, shock machine, diffusion Hydrogen is tested using gas chromatogram diffusion hydrogen analyzer.The deposited metal composition of the present embodiment is shown in Table 2-3, deposited metal Mechanical property is shown in Table 2-4, and welding joint mechanical property is shown in Table 2-5, and diffusible hydrogen content is shown in Table 2-6, and the mensure of wherein diffusible hydrogen is adopted With mercury process, test three and average：
Chemical composition (the unit of table 2-3 deposited metal：The percentage ratio of welding rod weight)
C Mn Si P S Ni Mo Fe
0.063 0.98 0.21 0.009 0.006 2.53 0.21 Surplus
The mechanical property of table 2-4 deposited metal
The mechanical property of table 2-5 welding point
Table 2-6 deposited metal diffusible hydrogen content
Test specimen Drying condition before welding electrode Diffusible hydrogen content (ml/100g)
Embodiment 2 380℃*1h 2.23(2.05/2.53/2.11)
Embodiment 3：
Using general manufacturing process in welding rod production industry, to select core wire by core wire component requirements, by coating raw material Prepared in proportion and prepared electrode coating by wet mixing is dry mixed, electrode coating is coated on core wire, is allowed to molding.Weldering Core component is shown in Table 3-1, and compositions of surfacing metal is shown in Table 3-2.
Table 3-1 core wire composition (unit：Percentage by weight)
C Si Mn P S Fe
0.059 0.023 0.487 0.011 0.003 Surplus
Table 3-2 coating recipe (unit：Percentage by weight)
The welding rod made is detected, before soldering test, welding rod first carries out 350-380 DEG C of baking 1 hour, welding rule Model：Using DC reverse connection, deposited metal mechanics adopts downhand welding, and its road temperature is 150-160 DEG C, and heat input is 15-20KJ/cm； Weld joint mechanical adopts vertical position welding, and its road temperature is 150-160 DEG C, and heat input is 30-35KJ/cm.Chemical property adopts spark Atomic Emission Spectrometer AES is tested, and mechanical property is tested using cupping machine, cryostat, shock machine, diffusion Hydrogen is tested using gas chromatogram diffusion hydrogen analyzer.Its deposited metal composition is shown in Table 3-3, deposited metal mechanical property It is shown in Table 3-4, welding joint mechanical property is shown in Table 3-5, diffusible hydrogen content is shown in Table 3-6, the mensure of wherein diffusible hydrogen adopts mercury process, Test three is averaged：
Chemical composition (the unit of table 3-3 deposited metal：The percentage ratio of welding rod weight)
C Mn Si P S Ni Mo Fe
0.061 1.05 0.25 0.012 0.007 2.58 0.22 Surplus
The mechanical property of table 3-4 deposited metal
The mechanical property of table 3-5 welding point
Table 3-6 deposited metal diffusible hydrogen content
- 50 DEG C of low temperature spherical tank high intensity welding rods of the present invention, using CaO-TiO2-CaF2 slag system formula, deposited metal On the basis of 2.5%Ni, with the addition of trace alloying element, welding rod welding procedure is functional again, defeated in the heat of 30-40KJ/cm Enter under amount welding, deposited metal tensile strength R under the heat treatment condition of 580 DEG C × 4hm>=630MPa, -60 DEG C of KV2>=60J, its Welding point tensile strength Rm>=610MPa, -50 DEG C of KV2>=70J, is particularly well-suited to the weldering of -50 DEG C of low temperature ethylene/Propylene Spherical Tanks Connect and build.
Above-described is only the preferred embodiment of the present invention it is noted that for those of ordinary skill in the art For, without departing from the concept of the premise of the invention, some deformation can also be made and improve, these broadly fall into the present invention Protection domain.

Claims (2)

1. a kind of -50 DEG C of low temperature spherical tank high-strength steel electrodes, are made up of core wire and coating, coating is coated on core wire outer wall, its It is characterised by, described coating accounts for the 50%～60% of welding rod gross weight；
On the basis of core wire gross weight, by weight percentage, the component of described core wire is as follows：
On the basis of coating gross weight, by weight percentage, the component of described coating is as follows：
2. -50 DEG C of low temperature spherical tank high-strength steel electrodes as claimed in claim 1 are it is characterised in that what described welding rod was formed The percentage by weight of deposited metal composition is：
CN201611163875.9A 2016-12-15 2016-12-15 High-strength steel electrode used for minus 50 DEG C low temperature spherical tank Withdrawn CN106425164A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110977244A (en) * 2019-12-25 2020-04-10 湖北理工学院 Formula and production process of 07MnNiMoDR steel low-alloy welding rod for spherical tank at-50 DEG C
CN111112877A (en) * 2019-12-25 2020-05-08 湖北理工学院 Welding process of 07MnNiMoDR steel spherical tank at-50 DEG C

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101168219A (en) * 2006-10-26 2008-04-30 中国船舶重工集团公司第七二五研究所 Method for preparing low hydrogen type downwards electrode
CN101537544A (en) * 2009-04-28 2009-09-23 天津市金桥焊材集团有限公司 Electric welding rod for welding large scale low temperature spherical tank steel
CN102528310A (en) * 2010-12-28 2012-07-04 昆山京群焊材科技有限公司 Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode
CN104400246A (en) * 2014-10-14 2015-03-11 洛阳双瑞特种合金材料有限公司 Welding electrode for welding -50 DEG C low-temperature pressure container steel
CN105127617A (en) * 2015-08-12 2015-12-09 中国船舶重工集团公司第七二五研究所 Electric welding rod for welding steel ocean platform with yield strength of 550MPa
CN105290645A (en) * 2015-10-30 2016-02-03 武汉铁锚焊接材料股份有限公司 Electrode for high-strength steel welding and preparation method and application thereof

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101168219A (en) * 2006-10-26 2008-04-30 中国船舶重工集团公司第七二五研究所 Method for preparing low hydrogen type downwards electrode
CN101537544A (en) * 2009-04-28 2009-09-23 天津市金桥焊材集团有限公司 Electric welding rod for welding large scale low temperature spherical tank steel
CN102528310A (en) * 2010-12-28 2012-07-04 昆山京群焊材科技有限公司 Hydrogen-induced crack resisting high-ductility ultra-low hydrogen welding electrode
CN104400246A (en) * 2014-10-14 2015-03-11 洛阳双瑞特种合金材料有限公司 Welding electrode for welding -50 DEG C low-temperature pressure container steel
CN105127617A (en) * 2015-08-12 2015-12-09 中国船舶重工集团公司第七二五研究所 Electric welding rod for welding steel ocean platform with yield strength of 550MPa
CN105290645A (en) * 2015-10-30 2016-02-03 武汉铁锚焊接材料股份有限公司 Electrode for high-strength steel welding and preparation method and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110977244A (en) * 2019-12-25 2020-04-10 湖北理工学院 Formula and production process of 07MnNiMoDR steel low-alloy welding rod for spherical tank at-50 DEG C
CN111112877A (en) * 2019-12-25 2020-05-08 湖北理工学院 Welding process of 07MnNiMoDR steel spherical tank at-50 DEG C

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Application publication date: 20170222