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High-toughness gas-shielded welding wire for long-life weathering steel structure and preparation method thereof

A weathering steel, long-life technology, applied in the field of high-toughness gas shielded welding wire and its preparation, can solve the problem that corrosion resistance and low-temperature impact toughness cannot meet the requirements of long-life, large-parameter high-speed trains, and cannot meet long-life, large-parameter high-speed trains. Train requirements, inability to guarantee impact toughness and other issues, to achieve the effect of long life, easy control, corrosion resistance and excellent low temperature impact toughness

Active Publication Date: 2020-03-13
SICHUAN XIYE NEW MATERIAL
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Problems solved by technology

Patent CN201010505223.5 (a weather-resistant gas-shielded welding wire for high-speed train bogies) discloses a gas-shielded welding wire suitable for high-speed train bogies, which can meet the requirements of existing ordinary high-speed train bogies, but Corrosion resistance and low-temperature impact toughness cannot meet the requirements of long-life, large-parameter high-speed trains
The reported G424M21Z and CHW-55CNH weather-resistant gas-shielded welding wires used in the welding of high-speed train bogies can only guarantee the impact toughness at -40°C, but cannot guarantee the impact toughness at -60°C. At the same time, the corrosion rate of the deposited metal is 1.5×10 -6 -2.0×10 -6 g / mm 2 .h, which is lower than the corrosion resistance of the base material SMA490BW (the corrosion rate of the deposited metal is 1.35×10 -6 g / mm 2 .h); the weld seam is the weakest position of the welded structural parts, and its corrosion resistance should have a certain safety margin compared with the base metal. It can be seen that the above two welding wires cannot meet the requirements of long-life and large-parameter high-speed trains
In the prior art, there are also studies aimed at improving the low-temperature impact toughness of welding wire, and at improving the corrosion resistance of welding wire, but there is no such thing as meeting the requirements of long life and large parameters for key components of high-speed trains and large-span weather-resistant steel bridge structures. Research on related welding wires with excellent low temperature impact toughness

Method used

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  • High-toughness gas-shielded welding wire for long-life weathering steel structure and preparation method thereof
  • High-toughness gas-shielded welding wire for long-life weathering steel structure and preparation method thereof
  • High-toughness gas-shielded welding wire for long-life weathering steel structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A high-toughness gas-shielded welding wire for long-life weather-resistant steel structures. The chemical composition of the welding wire is: C: 0.046wt.%, Si: 0.47wt.%, Mn: 1.20wt.%, P: 0.008wt.%, S: 0.005wt.%, Cr: 0.40wt.%, Mo: 0.18wt.%, Cu: 0.36wt.%, Ni: 1.16wt.%, Ti: 0.025wt.%, O: 0.0072 wt.%, the sum of unavoidable impurity elements ≤ 0.30wt.%, the balance is Fe.

[0037] The preparation method of the welding wire in this example is: the molten steel is desulfurized, smelted by refining outside the furnace or electroslag remelting, and continuously cast into a billet. The continuous casting process needs to match the superheat and casting speed to improve the equiaxed crystal Ratio, the billet is rolled into a φ5.5mm wire rod, peeled, pickled to remove surface scale, boronized, dried, drawn into wire, copper plated, and sized; the pickling removes surface oxide The chemical composition of the pickling solution for the skin is 400ɡ / L of sulfuric acid and 50ɡ / L of f...

Embodiment 2

[0040] A high-toughness gas-shielded welding wire for long-life weather-resistant steel structures. The chemical composition of the welding wire is: C: 0.053wt.%, Si: 0.51wt.%, Mn: 1.24wt.%, P: 0.007wt.%, S: 0.005wt.%, Cr: 0.38wt.%, Mo: 0.15wt.%, Cu: 0.30wt.%, Ni: 1.17wt.%, Ti: 0.015wt.%, O: 0.0069 wt.%, the sum of unavoidable impurity elements ≤ 0.30wt.%, the balance is Fe.

[0041] The preparation method of the welding wire in this example is the same as that in Example 1.

[0042] Perform the deposited metal performance test on the welding wire in this example: yield strength R p0.2 506MPa; tensile strength R m It is 592MPa; the elongation after breaking is 26%; the impact energy KV at -40°C 2 140J; impact energy KV at -60°C 2 is 102J; the corrosion rate of the deposited metal after periodic infiltration for 100h is 9.22×10 -7 g / mm 2 .h; The corrosion rate of the deposited metal after periodic infiltration for 1000h is 4.50×10 -7 g / mm 2 .h.

Embodiment 3

[0044] A high-toughness gas-shielded welding wire for long-life weather-resistant steel structures. The chemical composition of the welding wire is: C: 0.06wt.%, Si: 0.55wt.%, Mn: 1.35wt.%, P: 0.009wt.%, S: 0.004wt.%, Cr: 0.35wt.%, Mo: 0.22wt.%, Cu: 0.38wt.%, Ni: 1.26wt.%, Ti: 0.018wt.%, O: 0.0055 wt.%, the sum of unavoidable impurity elements ≤ 0.30wt.%, the balance is Fe.

[0045] The preparation method of the welding wire in this example is the same as that in Example 1.

[0046] Perform the deposited metal performance test on the welding wire in this example: yield strength R p0.2 534MPa; tensile strength R m It is 621MPa; the elongation after breaking is 25%; the impact energy KV at -40°C 2 124J; impact energy KV at -60°C 2 is 88J; the corrosion rate of the deposited metal after periodic infiltration for 100h is 8.18×10 -7 g / mm 2 .h; The corrosion rate of the deposited metal after 1000 hours of periodic infiltration is 4.01×10 -7 g / mm 2 .h.

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Abstract

Provided are a high-toughness gas shielded welding wire for a long-life weathering steel structure and a preparation method of the high-toughness gas shielded welding wire. The chemical components ofthe welding wire comprise, by mass percent, 0.04-0.08 % of C, 0.40-0.60 % of Si, 1.10-1.40 % of Mn, being less than or equal to 0.010 % of P, being less than or equal to 0.006 % of S, 0.25-0.45 % of Cr, 0.10-0.25 % of Mo, 0.25-0.40 % of Cu, 1.00-1.30 % of Ni, 0.01-0.03 % of Ti, 0.004-0.008 % of O, being less than or equal to 0.30 % of the sum of unavoidable impurity elements, and the balance Fe. Through the technical scheme of scientific proportioning of the chemical components of the welding wire, the welding performance is stable, and the obtained deposited metal not only has good comprehensive mechanical properties but also has excellent corrosion resistance and low temperature impact toughness. According to the preparation method, the manufacturing process is stable, and the percent ofpass is high.

Description

technical field [0001] The invention relates to a high-toughness gas-shielded welding wire for long-life weather-resistant steel structures and a preparation method thereof, belonging to the field of welding materials. Background technique [0002] With the rapid development of my country's national economy, the construction of high-speed trains and bridges is developing in the direction of long life, large parameters, and high performance. Safety and reliability are the key to their development. At present, the speed of high-speed trains has grown to over 350 km / h, and the design service life has been developed from the current 30 years to more than 40 years; the development of large-span bridges has reached over a kilometer span, and the design service life has changed from Built for a 100-year lifespan development design to 120+ years. At present, key components of high-speed trains such as bogies and long-span weather-resistant steel bridge structures are designed and m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3066B23K35/3073B23K35/40
Inventor 朱藤辉王高见刘丽康丹丹
Owner SICHUAN XIYE NEW MATERIAL
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