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Flux-cored wire for corrosion-resistant steel

A corrosion-resistant steel and flux-cored technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of not fully complying with flux-cored welding wire, etc., and achieve excellent welding process performance, good mechanical properties, welding Good process performance

Inactive Publication Date: 2017-05-10
ANHUI HUAZHONG WELDING MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flux-cored welding wire is an important welding material for steel plate welding. In the process of matching corrosion-resistant steel welding, the weld metal is required not only to have the characteristics of high strength and high toughness, but also to have good resistance to hydrogen sulfide corrosion and seawater corrosion. Therefore, the development of a flux-cored wire that is resistant to hydrogen sulfide corrosion and seawater corrosion plays an important role in promoting my country's oil and gas construction. At present, there is no flux-cored wire that fully meets the above requirements in the prior art.

Method used

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  • Flux-cored wire for corrosion-resistant steel

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A corrosion-resistant steel flux-cored welding wire, including a low-carbon steel sheath and a flux core, calculated in terms of weight percentage, based on the total weight of the flux core, the composition of the flux core is:

[0035] TiO 2 15%, KF 6%, silicon dioxide 10%, zirconium dioxide 0.4%, titanium-iron alloy 3%, graphite 10%, boron carbide 3%, silicon-manganese alloy 2%, nickel 10%, aluminum oxide 2%, trioxide 0.5% of di-iron and 2.5% of copper, and the balance is iron powder.

[0036] Welding parameters in this embodiment: I=340-350A, U=32-33V, gas flow rate 25L / min, using CO 2 Gas protection, CO 2 The gas purity is above 99.98%. The chemical composition of the welding wire deposited metal is shown in Table 1, and the mechanical properties of the deposited metal are shown in Table 2:

[0037] Table 1 Deposit metal chemical composition (wt%)

[0038] C mn Si S P Ni Mo 0.073 1.33 0.32 0.0082 0.015 0.015 0.13

[0039] Table...

Embodiment 2

[0042] A corrosion-resistant steel flux-cored welding wire, including a low-carbon steel sheath and a flux core, calculated in terms of weight percentage, based on the total weight of the flux core, the composition of the flux core is:

[0043] TiO 2 20%, KF 3%, silicon dioxide 5%, zirconia 0.6%, titanium-iron alloy 4%, graphite 6%, boron carbide 5%, silicon-manganese alloy 6%, nickel 8%, alumina 4%, trioxide 1% of di-iron and 1.5% of copper, the balance is iron powder.

[0044] The rest are the same as in Example 1, the chemical composition of the welding wire deposited metal is shown in Table 3, and the mechanical properties of the deposited metal are shown in Table 4:

[0045] Table 3 Deposit metal chemical composition (wt%)

[0046] C mn Si S P Ni Mo 0.082 1.36 0.28 0.0082 0.011 0.014 0.13

[0047] Table 2 Mechanical properties of deposited metal

[0048] Tensile strength (MPa) Yield point (MPa) Elongation (%) -20℃Impact...

Embodiment 3

[0050] A corrosion-resistant steel flux-cored welding wire, including a low-carbon steel sheath and a flux core, calculated in terms of weight percentage, based on the total weight of the flux core, the composition of the flux core is:

[0051] TiO 2 25%, KF 3%, silicon dioxide 4%, zirconia 0.8%, titanium-iron alloy 4%, graphite 6%, boron carbide 7%, silicon-manganese alloy 8%, nickel 6%, aluminum oxide 6%, trioxide 1.2% of di-iron and 0.6% of copper, and the balance is iron powder.

[0052] The rest are the same as in Example 1, the chemical composition of the welding wire deposited metal is shown in Table 5, and the mechanical properties of the deposited metal are shown in Table 6:

[0053] Table 5 Chemical composition of deposited metal (wt%)

[0054] C mn Si S P Ni Mo 0.084 1.32 0.28 0.0081 0.011 0.013 0.12

[0055] Table 6 Mechanical Properties of Deposited Metal

[0056]

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Abstract

The invention provides a flux-cored wire for corrosion-resistant steel. The flux-cored wire for corrosion-resistant steel comprises a low carbon steel sheath and a core, and based on the total weight of the core, the components of the core include, by weight, 15-25% of TiO2, 2-6% of KF, 4-10% of silicon dioxide, 0.4-0.8% of zirconium dioxide, 3-6% of ferro-titanium, 5-10% of graphite, 3-7% of boron carbide, 2-8% of siliconmanganese alloy, 6-10% of nickel, 2-6% of alumina, 0.5-1.5% of ferric oxide, 0.5-2.5% copper, and the balance iron powder; the filling rate of the core is 30-40%. The flux-cored wire has the advantages of good arc stability, little splash, small smoke and easy slag removing, and is suitable for welding the corrosion-resistant steel serving in environment with hydrogen sulfide corrosion and seawater corrosion.

Description

technical field [0001] The invention belongs to the technical field of welding materials, and in particular relates to a flux-cored welding wire for corrosion-resistant steel. Background technique [0002] With the development of the national economy, my country's demand for energy is increasing. Due to the rapid rise of international crude oil prices and the rapid decline of onshore oil resources, offshore oil and gas development has become a hot spot for energy development in countries all over the world. While the country has invested a lot of human and financial resources in the development of marine equipment systems, it has also put forward higher requirements for steel used in oil and gas transmission. [0003] There are both hydrogen sulfide corrosion and seawater corrosion in oil and gas transportation, so the steel plate is required to have good resistance to hydrogen sulfide corrosion and good seawater corrosion resistance. Flux-cored welding wire is an important...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/3053B23K35/40B23K35/406
Inventor 曹立兵
Owner ANHUI HUAZHONG WELDING MATERIAL CO LTD
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