A high-nitrogen and low-nickel high-temperature flux-cored welding wire and its preparation process

A flux-cored wire, high-temperature technology, applied in welding equipment, manufacturing tools, welding media, etc., can solve the problems of poor high-temperature corrosion resistance of flux-cored wire, different strength requirements, and high-temperature tensile strength that cannot reach 700 MPa or more. Achieve excellent heat crack resistance, solve the problem of high price and scarcity, and excellent high temperature corrosion resistance

Active Publication Date: 2021-08-03
SHENYANG POLYTECHNIC UNIV
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  • Description
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Problems solved by technology

[0009] However, although the stainless steel flux-cored wire disclosed in Patent Document 1 uses the addition of N elements, the design concept does not focus on its substitution effect, and the flux-cored wire is designed to meet the impact performance requirements at extremely low temperatures, which is different from this Invention of flux-cored wire for high temperatures is different
In addition, although the flux-cored welding wire for high-temperature-resistant steel disclosed in Patent Document 2 can be used in an environment above 500 degrees Celsius, its high-temperature tensile strength cannot reach above 700 MPa, and the patented flux-cored welding wire has poor high-temperature corrosion resistance, which is different from that of The present invention adopts N to replace Ni with different design ideas, and the strength requirements achieved under high temperature conditions are different

Method used

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  • A high-nitrogen and low-nickel high-temperature flux-cored welding wire and its preparation process
  • A high-nitrogen and low-nickel high-temperature flux-cored welding wire and its preparation process
  • A high-nitrogen and low-nickel high-temperature flux-cored welding wire and its preparation process

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preparation example Construction

[0092] Further, the preparation method of the high-nitrogen and low-nickel high-temperature flux-cored wire includes the following steps:

[0093] (1) Preparation of flux powder: mix the flux powder evenly according to the required mass percentage;

[0094] (2) Flux filling: after cleaning the outer skin of the nickel strip, roll it into a "U" shape, fill it with uniformly mixed flux powder, and then roll the outer skin of the nickel strip into an "O" sealed flux powder to obtain a semi-finished welding wire;

[0095] (3) Diameter-reducing wire drawing: the semi-finished welding wire is lubricated, and then drawn from a diameter of 3.18mm to 1.2mm through five passes, and finally a high-nitrogen, low-nickel high-temperature flux-cored wire is obtained.

[0096] Further, the calculation of the flux powder filling rate in the step (2) is realized by the following:

[0097] The flux powder is filled into the U-shaped nickel belt driven by the conveyor belt, and the mathematical ...

Embodiment 1-6 and comparative example 1-3

[0153] Flux-cored wires having the chemical compositions shown in Table 2 were produced.

[0154] Among them, Comparative Example 1 is an ENiCrMo3 nickel-based superalloy flux-cored welding wire. Comparative example 2 is a 316L stainless steel flux cored wire. Comparative example 3 is a 316LN stainless steel flux-cored welding wire.

[0155] The wire diameters of the obtained flux-cored wires were all 1.2 mm, and the filling rate was 25-30 wt%.

[0156] In addition, the chemical compositions in Table 2 are expressed in wt% relative to the total mass of the welding wire. In addition, among the contents of the various components contained in the so-called "Formula A" welding wire, the value represented by [Ni+30×C+28×N+0.5×Mn+0.3×Cu+10.4], the so-called "Formula B" formula The value represented by [Cr+Mo+1.5×Si+0.5×Nb+5×V] among the contents of each component included in the welding wire.

[0157]

[0158] Evaluation of the properties of the obtained flux-cored wire and w...

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Abstract

The invention provides a high-nitrogen, low-nickel, high-temperature flux-cored welding wire and a preparation process. The high-nitrogen, low-nickel, high-temperature flux-cored welding wire is composed of the following elements by mass percentage: C: below 0.04wt%, Si: below 0.8wt%, Mn: 0.5~5.0wt%, Cu: 1.0wt% or less, Ni: 25~33wt%, Cr: 17~26wt%, Mo: 3.0~6.0wt%, Nb: 3.0~5.0wt%, N: 0.1~0.4 wt%, Ti: 0.4~1.1wt%, Al: 0.1~0.5wt%, Ti / Al: 1.8~2.3 and Ti+Al: 0.5~1.5wt%, (Ti+Al) / N: 1.5~4.0, V : 0.04 to 0.12 wt%, Fe: the remainder. The invention adopts low-cost N to replace part of Ni elements, and prepares a new type of welding material used for welding 316L and part of nickel-based superalloys and whose high-temperature performance is not lower than that of nickel-based flux-cored welding wires, and simultaneously solves the problem of high price and scarcity of Ni. question. The high-nitrogen, low-nickel, and high-temperature flux-cored welding wire prepared by the invention can be used under high temperature (600-700° C.) conditions, and has excellent high-temperature mechanical properties, thermal crack resistance and high-temperature corrosion resistance.

Description

technical field [0001] The invention belongs to the field of welding in material processing engineering, and in particular relates to a high-nitrogen and low-nickel high-temperature flux-cored welding wire and a preparation process thereof. Background technique [0002] Nickel-based flux-cored welding consumables are used for repair welding of stainless steel with excellent high temperature resistance and corrosion resistance, and are widely used in various industrial fields. However, domestic nickel resources are scarce, and a large amount of imports are needed to maintain demand, which leads to increased costs and becomes a bottleneck for the development of the stainless steel industry. On the premise of ensuring the same performance and reducing the cost, finding new elements to replace nickel is the main development direction of industrial production at present. [0003] As a cheap resource, N element, similar to Ni element, has the ability to expand the austenite phase...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/02B23K35/30B23K35/40
CPCB23K35/0266B23K35/3066B23K35/40
Inventor 苏允海戴志勇梁学伟刘韫琦杨太森武兴刚魏祖勇
Owner SHENYANG POLYTECHNIC UNIV
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