Nb-containing stainless steel soldering strip and soldering flux for monolayer strip electro-slag surfacing

A single-layer strip and stainless steel technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of deterioration of welding workability, difficulty in slag removal, corrosion resistance of a large amount of residue, etc., and achieve slag removal Easy, excellent surfacing welding process performance, and beautiful weld bead formation

Inactive Publication Date: 2017-02-22
KUSN GINTUNE WELDING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In some large-scale petrochemical equipment, such as hydrogenation reactors, because of the high pressure, high temperature environment, and the state of hydrogen, the stainless steel lining containing Nb is often used to improve the intergranular corrosion resistance, but the stainless steel with Nb added in the welding process, There are often defects such as deterioration of welding workability, difficulty in slag removal, large amount of residue and poor corrosion resistance

Method used

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  • Nb-containing stainless steel soldering strip and soldering flux for monolayer strip electro-slag surfacing
  • Nb-containing stainless steel soldering strip and soldering flux for monolayer strip electro-slag surfacing
  • Nb-containing stainless steel soldering strip and soldering flux for monolayer strip electro-slag surfacing

Examples

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Effect test

Embodiment 1

[0086] In order to achieve the purpose of the present invention, the present invention provides a kind of Nb-containing stainless steel single-layer electroslag surfacing welding strip and flux, including welding strip and flux. The flux in this embodiment is marked as flux 1, flux 1 chemical group The specific weight percentages of the components are shown in Table 1 below. The chemical components in Table 1 are sintered at 650° C. to 850° C. to prepare flux 1. The sum of the weight percentages of the chemical components of flux 1 is 100%.

[0087] Table 1 Flux 1 Chemical Component Weight Percentage (%)

[0088]

[0089] The welding strip is marked as CDS-309LNb, and the chemical composition weight percentage of welding strip 1 is shown in Table 2: the sum of the chemical composition weight percentages of the welding strip is 100%, and the balance is Fe and other unavoidable impurities. The preparation process of CDS-309LNb is as follows: the chemical components in Table 2...

Embodiment 2

[0107] In order to achieve the purpose of the present invention, the present invention provides a kind of Nb-containing stainless steel single-layer electroslag surfacing welding strip and flux, the preparation of the flux is the same as in Example 1, except that the weight of the chemical components of the flux Percentage, the flux in the present embodiment is marked as flux 2, and the specific weight percentage of described flux 2 chemical components is as follows table 7:

[0108] Table 7 Solder 2 Chemical Component Weight Percentage (%)

[0109]

[0110] The sum of the weight percentages of the chemical components of the flux 2 is 100%.

[0111] The chemical composition weight percent of the welding strip in this embodiment and the preparation of the welding strip are all the same as in Example 1, and the overlay welding process parameters in this embodiment are also the same as in Example 1, except that the flux 2 The performance of surfacing welding process is shown ...

Embodiment 3

[0123] In order to achieve the purpose of the present invention, the present invention provides a kind of Nb-containing stainless steel single-layer electroslag surfacing welding strip and flux, the preparation of the flux is the same as in Example 1, except that the weight of the chemical components of the flux Percentage, the flux in the present embodiment is marked as flux 3, and the specific weight percentage of described flux 3 chemical components is as follows table 11:

[0124] Table 11 Soldering flux 3 chemical composition weight percent (%)

[0125]

[0126] The sum of the weight percentages of the chemical components of the flux 3 is 100%.

[0127] The chemical composition weight percent of the welding strip in this embodiment and the preparation of the welding strip are all the same as in Example 1, and the overlay welding process parameters in this example are the same as in Example 1, except that the welding flux 3 The welding process performance is shown in T...

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Abstract

The invention discloses an Nb-containing stainless steel soldering strip and soldering flux for monolayer strip electro-slag surfacing. The soldering strip comprises, by weight, 0-0.03% of C, 0.1-0.5% of Si, 1-2.5% of Mn, 0-0.03% of P, 0-0.03% of S, 9-14% of Ni, 21-25% of Cr, 0.4-0.8% of Nb, 0-0.05% of N and the balance Fe and other inevitable impurities. The soldering flux comprises, by weight, 55-70% of CaF2, 8-15% of Al2O3, 5-10% of SiO2, 0.2-1.5% of Nb2O5, 5-15% of CaO, 1-5% of NaF and 1-5% of AlF3. By regulating and controlling the chemical components of the soldering strip and the soldering flux, deslagging is easy in the welding process, a formed weld pass is attractive, and the excellent intergranular corrosion resistance is achieved, and no cracks occur during surfacing bending.

Description

technical field [0001] The invention relates to the field of welding materials, in particular to a Nb-containing stainless steel single-layer electroslag surfacing welding strip and flux. Background technique [0002] The strip electrode automatic surfacing technology was introduced into China in the 1970s. Due to its high efficiency, uniform surfacing quality, low dilution rate, and excellent metal properties of the surfacing layer, it has been widely used in various domestic pressure vessel manufacturing industries. Currently the preferred welding method for large area surfacing. With the development of large-scale and large-scale petrochemical industry, higher requirements are put forward for the surfacing efficiency of large-scale equipment, such as hydrogenation equipment, raw flow synthesis tower, coal liquefaction reactor and other pressure vessels. Welding often adopts the multi-layer surfacing welding method of the first layer for surface layer surfacing, and the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/362
CPCB23K35/3053B23K35/3605B23K35/362
Inventor 蔡鸿祥郑伊洛
Owner KUSN GINTUNE WELDING
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