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

A high-strength steel and welding rod technology, applied in the direction of welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of unsatisfactory weld metal, unsatisfactory low-temperature impact toughness, and heat input welding, etc., to achieve welding Easy slag removal, good fluidity and guaranteed mechanical properties

Inactive Publication Date: 2017-02-22
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] While researching the domestic 07MnNiMoDR ​​steel plate, some well-known domestic welding material manufacturers have also carried out research and development of matching electrodes, but they cannot be welded with a large heat input, and the low-temperature impact toughness is not ideal after long-term heat treatment, especially in the vertical The weld metal in the welding position cannot meet the technical requirements of -50°C KV2≥47J

Method used

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

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Embodiment 1

[0031] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. of forming. See Table 1-1 for solder core composition and Table 1-2 for coating composition.

[0032] Table 1-1 Weld core composition (unit: weight percentage)

[0033] C Si mn P S Fe 0.062 0.022 0.477 0.011 0.005 margin

[0034] Table 1-2 drug skin formula (unit: weight percentage)

[0035]

[0036] Test the finished electrode, and bake the electrode at 350-380°C for 1 hour before the welding test. The heat input is 15-20KJ / cm; the welding joint mechanics adopts vertical welding, the path temperature is 150-160°C, and the heat input is 30-35KJ / cm. The chemical properties ...

Embodiment 2

[0047] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. of forming. See Table 2-1 for solder core composition and Table 2-2 for coating composition.

[0048] Table 2-1 Weld core composition (unit: weight percentage)

[0049] C Si mn P S Fe 0.058 0.025 0.484 0.010 0.004 margin

[0050] Table 2-2 Drug skin formula (unit: weight percentage)

[0051]

[0052]Test the finished electrode, and bake the electrode at 350-380°C for 1 hour before the welding test. The heat input is 15-20KJ / cm; the welding joint mechanics adopts vertical welding, the path temperature is 150-160°C, and the heat input is 30-35KJ / cm. The chemical properties a...

Embodiment 3

[0062] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. of forming. See Table 3-1 for solder core composition and Table 3-2 for coating composition.

[0063] Table 3-1 Weld core composition (unit: weight percentage)

[0064] C Si mn P S Fe 0.059 0.023 0.487 0.011 0.003 margin

[0065] Table 3-2 Drug skin formula (unit: weight percentage)

[0066]

[0067] Test the finished electrode, and bake the electrode at 350-380°C for 1 hour before the welding test. The heat input is 15-20KJ / cm; the welding joint mechanics adopts vertical welding, the path temperature is 150-160°C, and the heat input is 30-35KJ / cm. The chemical properties ...

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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

technical field [0001] The invention relates to the field of welding materials, in particular to a high-strength steel welding rod for a -50°C low-temperature spherical tank. Background technique [0002] The low-temperature spherical tank at -50°C is the key storage equipment for the ethylene / propylene plant. Due to the high design pressure, low temperature, inflammability and explosion, and high technical index requirements, the construction level of the low-temperature ethylene / propylene spherical tank basically represents a country or country. The highest level of spherical tank construction in the region. [0003] At the beginning of the 21st century, with the improvement of my country's steel level, in Tianjin Petrochemical Large Ethylene Project in 2008, domestic 07MnNiMoDR ​​steel plates were used to replace imported Japanese JFE-HITEN610U2L steel plates for -50°C low-temperature ethylene / propylene spherical tanks. However, the welding rods for 07MnNiMoDR ​​steel sp...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/36B23K35/365
CPCB23K35/3053B23K35/3602B23K35/365
Inventor 蔡鸿祥陈国栋王登峰程浩
Owner KUSN GINTUNE WELDING
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