A -70℃ low temperature steel welding rod

Abstract

The invention discloses a -70 degrees centigrade low-temperature steel welding bar. The -70 degrees centigrade low-temperature steel welding bar comprises a welding core and a coating, the coating of the welding bar is composed of 44-54% of marble, 15-24% of fluorite, 3-6% of barium carbonate, 2-5% of quartz, 2-5% of dehydration potassium titanate, 0.5-1.5% of borax, 1-3% of manganese metal, 3-6% of atomized ferrosilicon, 1-3% of rare earth ferrosilicon, 3-6% of ferrotitanium, 0.5-1.0% of silicon calcium alloy, 6.0-8.0% of nickel powder and 0.2-1.0% of Teflon. The -70 degrees centigrade low-temperature steel welding bar is featured with low nickel content, less splashing, good molten bath fluidity, uniform slag cover, soft electric arc sound, beautiful weld joint appearance, easiness in sediment separation and good welding technique, the content of diffusible hydrogen in the weld joint metal is within 5ml / 100 g (mercury process), and this meets the standard super-low-hydrogen welding bar requirement.

Description

technical field

[0001] The invention relates to a -70°C low-temperature steel electrode, in particular to a -70°C low-temperature steel electrode suitable for welding 09MnNiDR steel, and belongs to the technical field of welding materials. Background technique

[0002] Petroleum, chemical and other energy industries need a large amount of low-temperature steel to manufacture various production and storage equipment for liquefied petroleum gas, liquid ammonia, liquid oxygen, and liquid nitrogen. At present, the materials used in the energy industry at -70 to -196°C are mostly Ni-based low-temperature steels, and the Ni content is between 0.5% and 9%. The Ni-series steel with a Ni content of 0.5% to 2.3% is mainly used to manufacture low-temperature pressure vessels at -60 to -70°C. The 0.5% Ni low-temperature steel in my country is based on the corresponding foreign steel grades, and the chemical composition is optimized accordingly. The standard grade is 09MnNiDR, which has ...

Examples

Embodiment 1

[0019] Embodiment 1: each component of drug skin and the mass percentage of each component are shown in the following table:

[0020] Raw material name

mass percentage

Raw material name

mass percentage

marble

43.8％

Atomized ferrosilicon

5％

Fluorite

23％

Rare earth ferrosilicon

2％

barium carbonate

6％

ferro-titanium

6％

quartz

2％

Calcium silicon alloy

0.5％

Potassium titanate dehydrate

2％

nickel powder

7.5％

Borax

0.5％

Teflon powder

0.2％

manganese metal

1.5％

[0021] According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make we...

Embodiment 2

[0028] Embodiment 2: each component of drug skin and the mass percent of each component are shown in the following table:

[0029] Raw material name

mass percentage

Raw material name

mass percentage

marble

53.5％

Atomized ferrosilicon

3％

Fluorite

16％

Rare earth ferrosilicon

3％

barium carbonate

3％

ferro-titanium

3％

quartz

3％

Calcium silicon alloy

1％

Potassium titanate dehydrate

3％

nickel powder

6.5％

Borax

1％

Teflon powder

1％

manganese metal

3％

[0030] According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make welding rods ...

Embodiment 3

[0037] Embodiment 3: each component of drug skin and the mass percent of each component are shown in the following table:

[0038] Raw material name

mass percentage

Raw material name

mass percentage

marble

48％

Atomized ferrosilicon

4％

Fluorite

18.4％

Rare earth ferrosilicon

2％

barium carbonate

4％

ferro-titanium

4％

quartz

3％

Calcium silicon alloy

0.7％

Potassium titanate dehydrate

5％

nickel powder

7％

Borax

1.5％

Teflon powder

0.4％

manganese metal

2％

[0039]According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make welding ro...

technical field

[0001] The invention relates to a -70°C low-temperature steel electrode, in particular to a -70°C low-temperature steel electrode suitable for welding 09MnNiDR steel, and belongs to the technical field of welding materials. Background technique

[0002] Petroleum, chemical and other energy industries need a large amount of low-temperature steel to manufacture various production and storage equipment for liquefied petroleum gas, liquid ammonia, liquid oxygen, and liquid nitrogen. At present, the materials used in the energy industry at -70 to -196°C are mostly Ni-based low-temperature steels, and the Ni content is between 0.5% and 9%. The Ni-series steel with a Ni content of 0.5% to 2.3% is mainly used to manufacture low-temperature pressure vessels at -60 to -70°C. The 0.5% Ni low-temperature steel in my country is based on the corresponding foreign steel grades, and the chemical composition is optimized accordingly. The standard grade is 09MnNiDR, which has ...

Examples

Embodiment 1

[0019] Embodiment 1: each component of drug skin and the mass percentage of each component are shown in the following table:

[0020] Raw material name

mass percentage

Raw material name

mass percentage

marble

43.8％

Atomized ferrosilicon

5％

Fluorite

23％

Rare earth ferrosilicon

2％

barium carbonate

6％

ferro-titanium

6％

quartz

2％

Calcium silicon alloy

0.5％

Potassium titanate dehydrate

2％

nickel powder

7.5％

Borax

0.5％

Teflon powder

0.2％

manganese metal

1.5％

[0021] According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make we...

Embodiment 2

[0028] Embodiment 2: each component of drug skin and the mass percent of each component are shown in the following table:

[0029] Raw material name

mass percentage

Raw material name

mass percentage

marble

53.5％

Atomized ferrosilicon

3％

Fluorite

16％

Rare earth ferrosilicon

3％

barium carbonate

3％

ferro-titanium

3％

quartz

3％

Calcium silicon alloy

1％

Potassium titanate dehydrate

3％

nickel powder

6.5％

Borax

1％

Teflon powder

1％

manganese metal

3％

[0030] According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make welding rods ...

Embodiment 3

[0037] Embodiment 3: each component of drug skin and the mass percent of each component are shown in the following table:

[0038] Raw material name

mass percentage

Raw material name

mass percentage

marble

48％

Atomized ferrosilicon

4％

Fluorite

18.4％

Rare earth ferrosilicon

2％

barium carbonate

4％

ferro-titanium

4％

quartz

3％

Calcium silicon alloy

0.7％

Potassium titanate dehydrate

5％

nickel powder

7％

Borax

1.5％

Teflon powder

0.4％

manganese metal

2％

[0039]According to the above ratio, it is mixed into the electrode coating material, and the potassium and sodium mixed water glass is added to the electrode coating material, which is coated on the H04E special high-quality low-carbon and low-sulfur steel welding core by the electrode press coater, and then passed through the dryer. Drying and shaping to make welding ro...

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