Flux-cored wire for stainless steel

A stainless steel, gas-electric welding technology, applied in the direction of arc welding equipment, welding/welding/cutting items, welding media, etc., can solve the problems of reduced toughness, unsuitable for welding, reduced toughness of welded parts, etc., and reach the yield point and tensile strength Effect of improving and suppressing the decrease of toughness and excellent mechanical properties

Inactive Publication Date: 2009-12-09
KOBE STEEL LTD
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0008] If a large amount of N is added to the flux-cored wire for stainless steel gas electric welding, the toughness of the welded part in an extremely low temperature environment will decrease
In the flux-cored welding wire for stainless steel gas electric welding described in JP-A-11-138295, N or metal nitride is added to the sheath and / or the filler flux in order to ensure a yield strength of 0.2%. Toughness decreases in low-temperature environments, so it is not suitable for welding structures used in extremely low-temperature environments, such as LNG

Method used

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  • Flux-cored wire for stainless steel
  • Flux-cored wire for stainless steel
  • Flux-cored wire for stainless steel

Examples

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Embodiment Construction

[0021] figure 1 It is a cross-sectional view showing a welding wire for gas electric welding, figure 2 It is a perspective view showing a welding part of gas electric welding in a part of vertical and horizontal sections.

[0022] Such as figure 2 As shown, the gas-electric welding is carried out in the following manner. A liner 3 is placed on the groove 6 between the base metals 5 in a vertical position, and a sliding copper plate 2 is installed on the operator's side, and the welding wire 11 is supplied to the groove 6 by the welding torch 13. , and arc discharge occurs between the weld metal 43 and the welding wire 11 at the same time. The shielding gas is supplied to the welding part from the gas supply port 22 provided in the sliding copper plate 2, and by covering the arc 12 and the welding part 4 with the shielding gas, it is possible to prevent the intrusion of air into the welding atmosphere. The sliding copper plate 2 slides up and down along with the movement o...

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Abstract

The present invention relates to a flux-cored wire for stainless steel, which is characterized by filling welding flux into an outer skin composed of stainless steel, wherein relative to the total mass of the welding flux, the welding flux comprises 22-28 wt% of Cr, 8-12 wt% of Ni, and 55-70 wt% of Fe, the content of C is less than 6 wt%, the content of N is less than 5 wt%, when setting the content of Cr as [Cr], the content Mo as [Mo], the content of Ni as [Ni], the content C as [c], and the content of N as [N], the ratio Eq(Cr) / Eq(Ni) between the equivalent of Cr Eq(Cr) and the equivalent of Ni Eq(Ni) is 2.0 to 2.6, which is calculated by following formula. Eq(Cr)= [Cr] + [Mo], Eq (Ni) = [Ni] + 35 X [C] + 20 X [N]. Incomplete fusion and under cut can not occur, even if when welding very thick stainless steel plate according to the composing, thereby high toughness welding metal can be obtained under high intensity and very low temperature.

Description

technical field [0001] The present invention relates to gas-electric welding flux cores used for welding structures made of stainless steel that require strength and toughness in extremely low-temperature environments, such as leg members of LNG (liquefied natural gas) spherical tanks and ships, which require strength and toughness welding wire. Background technique [0002] Conventionally, stainless steel used for leg parts of LNG spherical tanks and large structures exposed to the atmosphere requires corrosion resistance, strength, and toughness in extremely low-temperature environments, so it has been used more than about 20mm thick stainless steel plate. Conventionally, such welding of thick stainless steel plates has been performed manually using a shielded arc welding method using an arc rod, or a semi-automatic gas shielded arc welding method in which a flux cored wire and a shielding gas are automatically supplied. [0003] However, in the construction based on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30
CPCB23K9/16B23K9/23B23K35/0266B23K35/22B23K35/368B23K2101/18B23K2103/05C22C38/40
Inventor 池田哲直迎井直树渡边博久
Owner KOBE STEEL LTD
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