Welding wire and welding flux for alternating-current submerged-arc welding of 2.25Cr-1Mo steel
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A technology of submerged arc welding and flux, applied in the field of welding technology, can solve problems such as short solidification time, inability to learn from, and differences
Inactive Publication Date: 2018-12-28
SICHUAN XIYE NEW MATERIAL
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[0004] However, for the welding process, since the weld metal is melted under the action of the arc, the liquid metal pool formed has a small volume and a short solidification time. The process of alloy strengthening and toughening is closely related to the overall smelting and heat treatment of steel plates and forgings There are significant differences in the process, and it is impossible to learn from the mature 2.25Cr-1Mo steel plate and forging design
In addition, high strength 2.25Cr-1Mo steel is prone to cold cracks due to the hardening tendency of the weld and the presence of diffusible hydrogen during welding
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preparation example Construction
[0066] Preparation of welding wire:
[0067] According to the composition table 1 of the welding wire, the raw materials are processed into Φ4mm submerged arc welding wire after smelting→casting→hot rolling→pickling→cold rolling→drawing→copper plating. In Table 1, No. 1-3 welding wires are welding wires provided by the present invention, and No. 4-6 welding wires are comparison welding wires.
[0068] Table 1: Composition table of No. 1-6 welding wire
[0069]
C
Si
mn
P
S
Cr
Mo
Cu
Ni
Sb
sn
As
Al
O
N
Welding wire 1
0.13
0.19
1.10
0.007
0.004
2.44
1.12
0.08
0.15
0.002
0.001
0.004
0.08
0.005
0.017
Welding wire 2
0.10
0.16
0.85
0.006
0.004
2.37
0.95
0.13
0.11
0.002
0.001
0.004
0.13
0.005
0.027
Welding wire 3
0.09
0.25
1.15
0.005
0.004
2.25
1.00
...
Embodiment 10
[0098] In Example 10, among the components of the welding wire 4 used, C was outside the characteristic range of the welding wire of the present invention. C is the main factor affecting the strength. When C is too high, the C of the deposited metal obtained in the corresponding embodiment 10 is relatively high, and it can be seen from Table 8 that the strength of the weld metal in embodiment 10 has exceeded Due to the high strength of the weld metal, the impact toughness of the weld deposited metal is reduced, and the temper embrittlement resistance test is unqualified.
Embodiment 11
[0099] In Example 11, the Si content in the composition of the welding wire 5 used was relatively high, resulting in an excessively high Si content in the deposited metal. If the Si content is too high, the low temperature impact toughness of the weld metal will be reduced, which is not conducive to the temper embrittlement performance. Among the corresponding weld metal properties in Table 8, the impact toughness decreased below the expected value, and the temper embrittlement resistance test failed.
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Abstract
The invention discloses a welding wire for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel. The welding wire is characterized by comprising, by mass, 0.07-0.20% of C, 0-0.3% of Si,0.4-1.6% of Mn, 0-0.010% of P, 0-0.010% of S, 2.00-2.60% of Cr, 0.85-1.16% of Mo, 0-0.1% of Cu, 0.03-0.25% of Ni, 0-0.30% of Al, 0-0.005% of Sb, 0-0.006% of Sn, 0-0.008% of As, 0-0.010% of O, 0-0.030% of N and the balance Fe. A welding flux comprises, by mass, 18-35% of magnesium oxide, 5-18% of silicon dioxide, 5-21% of calcium oxide, 11-21% of aluminum oxide, 5.7-20% of carbonate, 4.3-17.3% offluorite, 0.5-5% of potassium feldspar, 0-2% of electrolytic manganese, 0-1% of ferrosilicon and 0-2.5% of aluminum powder. The welding wire and the welding flux have the advantages that the welding wire is used with the welding flux, and accordingly the welding performance is good, and welded joints are highly resistant to crack and excellent in mechanical performance; the welding wire and the welding flux are applicable to containers such as a hydrogenation reactor with the wall thickness of 2.25Cr-1Mo, so that the welded joints are excellent in performance without defects.
Description
technical field [0001] The invention belongs to the technical field of welding technology, and in particular relates to a welding wire for AC submerged arc welding of 2.25Cr-1Mo steel and a flux used in conjunction with the welding wire. Background technique [0002] 2.25Cr-1Mo steel is currently the most widely used low-alloy heat-resistant steel in the oil refining equipment and refining and chemical equipment industries. It is widely used in pressure-bearing equipment operating in high-temperature / high-pressure / hydrogen-filled environments such as hydrogenation reactors. The size and wall thickness of this type of equipment are relatively large, and the commonly used welding method is submerged arc welding. [0003] During the design process of 2.25Cr-1Mo steel, the C-Si-Mn-Cr-Mo-Cu alloy system was used to achieve strengthening and toughening, and excellent comprehensive properties were obtained through heat treatment process, including room temperature strength, high te...
Claims
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