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Welding wire and welding flux for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel

A technology of submerged arc welding and flux, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of short solidification time, small volume of liquid metal molten pool, and inability to learn from it

Inactive Publication Date: 2018-12-28
SICHUAN XIYE NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for welded joints, since the weld metal is melted under the action of the arc, the liquid metal pool formed is small in size and the solidification time is very short. 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-0.25V steel plate and forging design
In addition, high strength 2.25Cr-1Mo-0.25V steel is prone to cold cracks due to the hardening tendency of the weld and the presence of diffusible hydrogen during welding

Method used

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  • Welding wire and welding flux for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel
  • Welding wire and welding flux for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel
  • Welding wire and welding flux for alternating-current submerged-arc welding of 2.25Cr-1Mo-0.25V steel

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0064] Preparation of welding wire:

[0065] 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, welding wire No. 1-3 is the welding wire provided by the present invention, and welding wire No. 4-6 is the comparison welding wire.

[0066] Table 1: Composition table of No. 1-6 welding wire

[0067]

C

Si

mn

P

S

Cr

Mo

V

Nb

Ni

Ti

Sb

sn

As

Cu

B

O

N

Welding wire 1

0.14

0.21

1.15

0.006

0.004

2.54

1.11

0.39

0.03

0.05

0.005

0.002

0.001

0.004

0.08

0.0008

0.005

0.007

Welding wire 2

0.09

0.15

0.85

0.006

0.004

2.34

0.95

0.35

0.03

0.01

0.001

0.002

0.001

0.004

0.13

0.0008

0.005

0.007

W...

Embodiment 10

[0096] In Example 10, the C content in the welding wire 4 used was too high. C is the main factor affecting the strength. When C is too high, the corresponding C of the deposited metal obtained in Example 10 is relatively high. However, it can be seen from Table 8 that the strength of the weld metal properties of Implementation 10 has exceeded the expected range. 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 fails.

Embodiment 11

[0097] In Example 11, Si and V were high in the welding wire 5 used, so that Si and V in the deposited metal of Example 11 were high. Excessively high Si and V contents will damage the low temperature impact toughness of the weld metal, which is not conducive to the temper embrittlement performance. Among the corresponding weld metal properties in Table 8, the impact toughness drops below the expected value, and the temper embrittlement resistance test fails.

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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,0.5-1.6% of Mn, 0-0.010% of P, 0-0.010% of S, 2.00-2.60% of Cr, 0.90-1.15% of Mo, 0.30-0.41% of V, 0.01-0.04% of Nb, 0-0.15% of Cu, 0-0.10% of Ni, 0-0.005% of Sb, 0-0.006% of Sn, 0-0.008% of As, 0-0.02% of Ti, 0-0.01% of B, 0-0.007% of O, 0-0.010% of N and the balance Fe. A welding flux comprises, by mass, 21-37% of magnesium oxide, 3-10% of silicon dioxide, 7-21% of calcium oxide, 10-21% of aluminum oxide, 5.7-22.7% of carbonate, 6.5-21% of fluorite, 0-3% 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 larger weld width can be obtained in a welding process under an alternating-current submerged-arc welding process; when thick walls are welded, effective sidewall bonding is facilitated, weld metal after welding is high in low-temperature impact toughness and highly resistant to cracks.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to a welding wire for AC submerged arc welding of 2.25Cr-1Mo-0.25V steel and a flux used in conjunction with the welding wire. Background technique [0002] 2.25Cr-1Mo-0.25V steel is currently the most widely used low-alloy heat-resistant steel in the oil refining equipment and refining and chemical equipment industries. use. 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-0.25V steel, the C-Si-Mn-Cr-Mo-V-Nb-Cu alloy system was adopted to achieve strengthening and toughening, and excellent comprehensive properties were obtained through heat treatment process, including room temperature strength , high temperature strength, low temperature impact toughness, high temperature durability and resistance to temper embrittlement. [0004] However, ...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/362
CPCB23K35/3086B23K35/362
Inventor 宋宝瑞范阳阳缪兴平曹佳郑若锋周正
Owner SICHUAN XIYE NEW MATERIAL
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