An ultra-low hydrogen high toughness welding rod for welding penstocks in hydropower stations

Abstract

The invention provides an ultralow-hydrogen high-toughness welding rod for welding of a water-diversion steel penstock in a hydropower station. A coating of the welding rod comprises, by mass, 40%-50% of marble, 2%-4% of dolomite, 18%-30% of fluorite, 2%-6% of quartz, 1%-3% of dehydrated feldspar, 1%-3% of zircon sand, 2%-4% of potassium titanate, 3%-6% of atomized ferrosilicon, 4%-8% of electrolytic manganese, 7%-12% of ferrotitanium, 1%-3% of light rare earth silicon iron, 0.5%-1.0% of ferromolybdenum, 2%-4% of nickel powder, and 0.5%-1.0% of rare earth fluoride. All the components are mixed according to the ratios to form the coating of the welding rod, potassium and sodium mixed water glass is added, an H04E welding core is coated with the mixture through a welding rod pressure coater, and the coated welding core is dried and shaped to form the electric welding rod. The deposited metal diffusible hydrogen content of the welding rod is 1.8 ml / 100 g, the low temperature impact toughness at minus 20 DEG C is stabilized within the range from 160 J to 180 J, and the welding requirement of the water-diversion steel penstock in a 610 MPa hydropower station can be met.

Description

technical field

[0001] The invention relates to an ultra-low-hydrogen high-toughness welding rod for welding a water diversion pressure steel pipe of a hydropower station, and belongs to the field of welding materials. Background technique

[0002] The welding of penstock steel pipes for water diversion in hydropower stations is the most important link in the fabrication and installation of metal structures in hydropower stations. The steel pipe base material generally adopts low-alloy high-strength quenched and tempered steel plates with a tensile strength of 610MPa, SUMIPEN610F and NK-HITEN610U2, which are manufactured by Sumitomo and NKK in Japan, respectively. This type of steel has a very reasonable alloy element design, very low C content and S, P impurity content, and a very stable structure. With its good comprehensive mechanical properties and process properties, it has won most of the domestic hydropower penstock market. For example, in the 26 generating units of ...

Examples

Embodiment 1

[0024] Embodiment 1: the percentage by weight of each component in the drug skin is shown in the following table:

[0025] Raw material name

weight percentage

Raw material name

weight percentage

marble

40

Electrolytic manganese

5

dolomite

4

Atomized ferrosilicon

6

Fluorite

18

Light Rare Earth Ferrosilicon

1

quartz

3

ferro-titanium

9

Dehydrated feldspar

3

Ferromolybdenum

0.5

Zircon sand

3

nickel powder

3

Potassium titanate

4

Rare earth fluoride

0.5

[0026] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0027]

[0028] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0029]

[0030] The hydrogen content of the deposited metal of the electrode prepared...

Embodiment 2

[0032] Embodiment 2: the percentage by weight of each component in the drug skin is shown in the following table:

[0033] Raw material name

weight percentage

Raw material name

weight percentage

marble

45

Electrolytic manganese

6

dolomite

2

Atomized ferrosilicon

3

Fluorite

23

Light Rare Earth Ferrosilicon

2

quartz

2

ferro-titanium

7

Dehydrated feldspar

1

Ferromolybdenum

1

Zircon sand

2

nickel powder

2

Potassium titanate

3

Rare earth fluoride

1

[0034] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0035]

[0036] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0037]

[0038] The hydrogen content of the deposited metal of the electrode prepared acc...

Embodiment 3

[0040] Embodiment 3: the percentage by weight of each component in the drug skin is shown in the following table:

[0041] Raw material name

weight percentage

Raw material name

weight percentage

marble

50

Electrolytic manganese

4

dolomite

2

Atomized ferrosilicon

4

Fluorite

18

Light Rare Earth Ferrosilicon

3

quartz

2

ferro-titanium

8

Dehydrated feldspar

1

Ferromolybdenum

0.5

Zircon sand

1

nickel powder

4

Potassium titanate

2

Rare earth fluoride

0.5

[0042] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0043]

[0044] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0045]

[0046] The hydrogen content of the deposited metal of the electrode prepared...

technical field

[0001] The invention relates to an ultra-low-hydrogen high-toughness welding rod for welding a water diversion pressure steel pipe of a hydropower station, and belongs to the field of welding materials. Background technique

[0002] The welding of penstock steel pipes for water diversion in hydropower stations is the most important link in the fabrication and installation of metal structures in hydropower stations. The steel pipe base material generally adopts low-alloy high-strength quenched and tempered steel plates with a tensile strength of 610MPa, SUMIPEN610F and NK-HITEN610U2, which are manufactured by Sumitomo and NKK in Japan, respectively. This type of steel has a very reasonable alloy element design, very low C content and S, P impurity content, and a very stable structure. With its good comprehensive mechanical properties and process properties, it has won most of the domestic hydropower penstock market. For example, in the 26 generating units of ...

Examples

Embodiment 1

[0024] Embodiment 1: the percentage by weight of each component in the drug skin is shown in the following table:

[0025] Raw material name

weight percentage

Raw material name

weight percentage

marble

40

Electrolytic manganese

5

dolomite

4

Atomized ferrosilicon

6

Fluorite

18

Light Rare Earth Ferrosilicon

1

quartz

3

ferro-titanium

9

Dehydrated feldspar

3

Ferromolybdenum

0.5

Zircon sand

3

nickel powder

3

Potassium titanate

4

Rare earth fluoride

0.5

[0026] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0027]

[0028] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0029]

[0030] The hydrogen content of the deposited metal of the electrode prepared...

Embodiment 2

[0032] Embodiment 2: the percentage by weight of each component in the drug skin is shown in the following table:

[0033] Raw material name

weight percentage

Raw material name

weight percentage

marble

45

Electrolytic manganese

6

dolomite

2

Atomized ferrosilicon

3

Fluorite

23

Light Rare Earth Ferrosilicon

2

quartz

2

ferro-titanium

7

Dehydrated feldspar

1

Ferromolybdenum

1

Zircon sand

2

nickel powder

2

Potassium titanate

3

Rare earth fluoride

1

[0034] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0035]

[0036] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0037]

[0038] The hydrogen content of the deposited metal of the electrode prepared acc...

Embodiment 3

[0040] Embodiment 3: the percentage by weight of each component in the drug skin is shown in the following table:

[0041] Raw material name

weight percentage

Raw material name

weight percentage

marble

50

Electrolytic manganese

4

dolomite

2

Atomized ferrosilicon

4

Fluorite

18

Light Rare Earth Ferrosilicon

3

quartz

2

ferro-titanium

8

Dehydrated feldspar

1

Ferromolybdenum

0.5

Zircon sand

1

nickel powder

4

Potassium titanate

2

Rare earth fluoride

0.5

[0042] The deposited metal composition of the electrode prepared according to the above ratio is shown in the following table:

[0043]

[0044] The mechanical properties of the deposited metal of the electrode prepared according to the above ratio are shown in the following table:

[0045]

[0046] The hydrogen content of the deposited metal of the electrode prepared...

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