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A kind of steel plate for high-energy welding and preparation method thereof

A high-energy-energy welding and steel plate technology, applied in the field of metallurgy, can solve the problems of grain coarsening, long residence time at high temperature, deterioration of strength and toughness, etc., and achieve the effect of good welding performance.

Active Publication Date: 2021-08-24
HEBEI IRON AND STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] With the development of large-scale engineering structures, large heat input welding represented by submerged arc welding, gas-electric vertical welding, electroslag welding, etc. During the energy welding process, the high temperature residence time in the heat-affected zone around the weld is long, the grain coarsening is serious, the cooling rate after welding is slow, and abnormal structures such as coarse Widmanstatten structure, upper bainite, and M-A are formed, which makes the heat-affected zone after welding Deterioration of strength and toughness, prone to defects such as cracks

Method used

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  • A kind of steel plate for high-energy welding and preparation method thereof
  • A kind of steel plate for high-energy welding and preparation method thereof

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Embodiment 1

[0047] The preparation method of the steel plate for high heat input welding in this embodiment includes the steps of smelting, die casting, heating, controlled rolling and controlled cooling, and the specific process steps are as follows:

[0048] (1) Smelting process: Vacuum induction furnace is used for smelting. Industrial pure iron is placed in the crucible in advance, and the lid is vacuumed. When the vacuum degree is ≤ 24Pa, the power is turned on. Keep the internal pressure at 0.04MPaMPa. First add ferro-zirconium and keep it for 4 minutes, then add ferrosilicon, manganese metal, ferrosulfur, and ferroniobium in turn to alloy. After the above alloys are melted, keep it for 2 minutes, and then add sponge titanium, Manganese nitride alloy, nickel-magnesium cored wire, and then tapped;

[0049] In the smelting process, the specification of the nickel-magnesium cored wire is φ10mm, the inside is compacted Ni-Mg alloy powder, the mass percentage of Ni is: 70%, the mass perc...

Embodiment 2

[0055] The preparation method of the steel plate for high heat input welding in this embodiment includes the steps of smelting, die casting, heating, controlled rolling and controlled cooling, and the specific process steps are as follows:

[0056] (1) Smelting process: Vacuum induction furnace is used for smelting. Industrial pure iron is placed in the crucible in advance, and the lid is vacuumed. When the vacuum degree is ≤ 24Pa, the power is turned on. The internal pressure is kept at 0.05MPa. First add ferro-zirconium and keep it for 5 minutes, then add ferrosilicon, metal manganese, ferrosulfur and ferroniobium in turn to alloy. After the above alloys are melted, keep it for 4 minutes, and then add sponge titanium, Manganese nitride alloy, nickel-magnesium cored wire, and then tapped;

[0057] In the smelting process, the specification of the nickel-magnesium cored wire is φ10mm, the inside is compacted Ni-Mg alloy powder, the mass percentage of Ni is: 70%, the mass perce...

Embodiment 3

[0063] The preparation method of the steel plate for high heat input welding in this embodiment includes the steps of smelting, die casting, heating, controlled rolling and controlled cooling, and the specific process steps are as follows:

[0064] (1) Smelting process: Vacuum induction furnace is used for smelting. Industrial pure iron is placed in the crucible in advance, and the lid is vacuumed. When the vacuum degree is ≤ 24Pa, the power is turned on. The internal pressure is kept at 0.05MPa. First add ferro-zirconium and keep it for 5 minutes, then add ferrosilicon, manganese metal, ferrosulfur and ferroniobium in order to alloy. Manganese nitride alloy, nickel-magnesium cored wire, and then tapped;

[0065] In the smelting process, the specification of nickel-magnesium cored wire is φ10mm, and the inside is compacted Ni-Mg alloy powder, the mass percentage of Ni is: 75%, the mass percentage of Mg is: 25%, and the outside is wrapped with 1mm thick Iron sheet;

[0066] (...

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Abstract

The invention discloses a steel plate for high heat input welding and a preparation method thereof. The preparation method includes the steps of smelting, die casting, heat treatment, controlled rolling and controlled cooling. A large number of fine and dispersed inclusion particles containing Ti, Zr, and Mg are formed in the steel plate of the present invention. During the welding process, the high-temperature stage pins the grain boundaries to refine the grains, and the low-temperature stage induces acicular ferrite to hinder the expansion of impact cracks. , so that the steel plate has good welding performance; the yield strength of the steel plate is ≥360MPa, the tensile strength is ≥490MPa, the reduction of area is ≥70%, and the longitudinal impact energy at 40°C is ≥250J; the heat-affected zone under the condition of 200KJ / cm line energy welding- Low temperature impact energy at 40°C ≥ 50J, and low temperature impact energy at 40°C ≥ 80J in the heat-affected zone under 300KJ / cm heat welding conditions.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a preparation method of a steel plate for high heat input welding. Background technique [0002] With the development of large-scale engineering structures, large heat input welding represented by submerged arc welding, gas-electric vertical welding, electroslag welding, etc. During the energy welding process, the high temperature residence time in the heat-affected zone around the weld is long, the grain coarsening is serious, the cooling rate after welding is slow, and abnormal structures such as coarse Widmanstatten structure, upper bainite, and M-A are formed, which makes the heat-affected zone after welding The strength and toughness deteriorate, and defects such as cracks are prone to occur. [0003] Oxide metallurgy was first proposed by Japanese scholars in 1990. The technical idea is to control the composition, size, quantity, and distribution of inclusio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/14C22C38/12C22C38/06C22C38/08C22C33/06C21C7/06C21D8/02B23K35/30
CPCB23K35/3073C21C7/0006C21C7/0056C21C7/06C21D8/0226C21D2211/002C21D2211/005C22C33/06C22C38/004C22C38/02C22C38/04C22C38/06C22C38/08C22C38/12C22C38/14
Inventor 李超李建新刘洪波张瑞忠李杰
Owner HEBEI IRON AND STEEL