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Stainless steel flux cored wire

A technology of flux-cored welding wire and stainless steel, applied in welding equipment, welding medium, welding equipment, etc., can solve the problems of insufficient strength characteristics, high cost, high alloy content, and achieve good slag peelability and good tensile strength. Effect

Inactive Publication Date: 2019-06-11
KOBE STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the Ni-based alloy flux-cored wire disclosed in Patent Document 1 is expensive because the alloy content of Ni, Cr, Mo, etc. is high compared with stainless steel.
In addition, the stainless steel chemical-coated electrode disclosed in Patent Document 2 has insufficient strength characteristics at room temperature, and because it is a chemical-coated electrode, welding efficiency is low.

Method used

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  • Stainless steel flux cored wire
  • Stainless steel flux cored wire
  • Stainless steel flux cored wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～14 and comparative example 1～10

[0125] Flux-cored welding wires having the chemical compositions shown in Table 2 were produced using sheaths having the chemical compositions shown in Table 1.

[0126] The wire diameters of the obtained flux-cored wires were all 1.2 mm, and the flux rate was 21 to 34% by mass.

[0127] In addition, the chemical compositions in Table 1 and Table 2 are expressed in mass % relative to the total mass of the welding wire. In addition, "Bi" means a Bi-converted value for a Bi compound, "F" means a fluorine-converted value for a fluoride, and "Na+K+Li" means an alkali metal compound composed of Na, K, and Li. The sum of the alkali metal conversion values. In addition, the so-called "formula A" is the value represented by [Ni+30×(C+N)+0.5×Mn+12.4] among the contents of each component contained in the welding wire, and the so-called "formula B" is the content of each component contained in the welding wire. Among the contents of each component, the value represented by [Cr+Mo+1.5×S...

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Abstract

THe invention provides a stainless steel flux cored wire, which is excellent in extension strength, low-temperature flexibility, anti-defection property and anti-hot-cracking property. The stainless steel flux cored wire inlcudes, by mass, lower than 0.04% of carbon, lower than 0.8% of silicon, 0.5-5.0% of manganese, lower than 3.0% of copper, 13-33% of nickel, 15-29% of chromium, 2.0-6.0% of molybdenum, lower than 1.0% of niobium, and 0.08-0.25% of nitrogen. In addition, the flux includes, by mass, 4.0-12.0% of TiO2, 0.05-3.0% of SiO2, 0.5-5.0% of ZrO2, lower than 2.0% of Al2O3, a bismuth compound with Bi equivalent value being lower than 0.01%, an alkali metal compound with alkali metal equivalent value being 0.1-2.0% and fluorides with fluorine equivalent value being 0.1-1.0%.

Description

technical field [0001] The present invention relates to a stainless steel flux-cored wire having a fully austenitic structure used for welding stainless steel for low-temperature applications, 5% Ni steel, and the like. Background technique [0002] Stainless steel welding consumables are used for welding stainless steel with excellent corrosion resistance and heat resistance, and are widely used in various industrial fields. On the other hand, for welding materials of 5% Ni steel used as structural members such as storage tanks such as LEG, Ni-based alloy welding materials are often used because high strength characteristics and impact performance at low temperatures are required. [0003] Existing stainless steel welding consumables are hardly used in the welding of 5% Ni steels because they cannot meet the specifications for strength and impact properties. [0004] For example, Patent Document 1 discloses a Ni-based alloy flux-cored wire for low-temperature steel welding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/365B23K35/30B23K9/16B23K103/04
CPCB23K9/16B23K35/0266B23K35/3086B23K35/3608B23K35/365B23K2103/04B23K2103/05B23K35/3053B23K35/3607B23K35/361C22C38/44C22C38/58
Inventor 菅原大志福田和博池田哲直西山繁树
Owner KOBE STEEL LTD
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