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Austenitic heat-resisting stainless steel welding electrode for ultra-supercritical thermal power units

A heat-resistant stainless steel, thermal power unit technology, applied in welding media, welding equipment, welding/cutting media/materials, etc., can solve the problems of limited high-temperature oxidation and corrosion resistance, insufficient high-temperature lasting strength, and large tube wall thickness. Achieve excellent mechanical properties and good welding process performance

Active Publication Date: 2018-06-01
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The development of high-efficiency ultra-supercritical thermal power plants above 600 °C is inevitable. The commonly used materials in the high-temperature section are austenitic heat-resistant steels such as Super304H and HR3C, which either have limited resistance to high-temperature oxidation and corrosion, or insufficient high-temperature durability, resulting in The wall thickness of the pipe is too large, the cost of materials and the difficulty of manufacturing process increase
For this new type of austenitic heat-resistant stainless steel, there is no matching welding material in China

Method used

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  • Austenitic heat-resisting stainless steel welding electrode for ultra-supercritical thermal power units
  • Austenitic heat-resisting stainless steel welding electrode for ultra-supercritical thermal power units
  • Austenitic heat-resisting stainless steel welding electrode for ultra-supercritical thermal power units

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. The molding:

[0039] Table 1-1 Weld core composition (unit: weight percentage)

[0040]

[0041] Table 1-2 Drug skin composition ratio (unit: weight percentage)

[0042] marble

dolomite

fluorite

rutile

Mica

Ferrosilicon

Ferromanganese

Ferroniobium

copper powder

Chrome powder

nickel powder

Tungsten powder

iron iron

15

10

16

5

3

5

1

4

7

4

15

7

margin

[0043] Table 1-3 The chemical composition of the deposited metal (unit: %), the balance is Fe and impurities

[0044] C

mn

Si

Ni

...

Embodiment 2

[0049] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. The molding:

[0050] Table 2-1 Composition of welding core wire (unit: weight percentage)

[0051] C

mn

Si

Ni

Cr

Mo

Cu

Nb

W

co

N

0.011

3.52

0.088

22.2

25.4

2.60

0.017

0.026

0.007

0.094

0.152

[0052] Table 2-2 Drug skin composition (unit: weight percentage)

[0053] marble

dolomite

fluorite

rutile

Mica

Ferrosilicon

Ferromanganese

Ferroniobium

copper powder

Chrome powder

nickel powder

Tungsten powder

iron powder

16

11

17

6

3

5.5

1

4

6.5

...

Embodiment 3

[0060] The general manufacturing process in the welding rod production industry is adopted, the welding core is selected according to the requirements of the welding core composition, the raw materials of the coating are prepared in proportion, and the welding rod coating is prepared by dry mixing and wet mixing, and the welding rod coating is applied to the welding core. The molding:

[0061] Table 3-1 Weld core composition (unit: weight percentage)

[0062] C

mn

Si

Ni

Cr

Mo

Cu

Nb

W

co

N

0.010

3.53

0.091

22.3

25.3

2.61

0.018

0.024

0.008

0.095

0.150

[0063] Table 3-2 Drug skin formula (unit: weight percentage)

[0064] marble

dolomite

fluorite

rutile

Mica

Ferrosilicon

Ferromanganese

Ferroniobium

copper powder

Chrome powder

nickel powder

Tungsten powder

iron powder

16

10

17

5.5

2.5

5

1

4.5

7

4

14

...

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Abstract

The invention provides an austenitic heat-resisting stainless steel welding electrode for ultra-supercritical thermal power units, comprising deposited metals, to be specific, 0.03-0.10% of C, 1.0-2.5% of Mn, < / =0.80% of Si, 24.0-26.0% of Ni, 21.5-23.5% of Cr, 1.5-2.5% of Mo, 2.5-3.5% of Cu, 0.30-0.60% of Nb, 3.0-4.0% of W, 1.0-2.0% of Co, 0.15-0.30% of N and the balance of Fe and impurities. TheCaO-CaF2-SiO2 slag system formulation is used herein, trace alloy elements are added, the main deposited metals include 25% of Ni, 22% of Cr, 3% of Cu, 3% of W and 1% of Co, welding processibility isgood, deposited metal tensile strength Rm is > / =720 MPa, ductility is > / =35%, and normal-temperature KV2 is > / =50 J.

Description

technical field [0001] The invention belongs to the field of welding materials, in particular to an austenitic heat-resistant stainless steel welding electrode for an ultra-supercritical thermal power unit. Background technique [0002] The development of high-efficiency ultra-supercritical thermal power plants above 600 °C is inevitable. The commonly used materials in the high-temperature section are austenitic heat-resistant steels such as Super304H and HR3C, which either have limited resistance to high-temperature oxidation and corrosion, or insufficient high-temperature durability, resulting in If the wall thickness of the pipe is too large, the cost of materials and the difficulty of the manufacturing process will increase. Therefore, in order to build a double-reheated high-efficiency ultra-supercritical thermal power unit with a temperature of 623°C or higher and ensure safe operation, it is necessary to improve and develop higher-performance austenitic heat-resistant...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K35/365
CPCB23K35/0272B23K35/3066B23K35/3605B23K35/365
Inventor 蔡鸿祥陈国栋王登峰周峙宏
Owner KUSN GINTUNE WELDING
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