CN107775211B

CN107775211B - Flux-cored wire for wear-resistant hard-face surfacing

Info

Publication number: CN107775211B
Application number: CN201710777135.2A
Authority: CN
Inventors: 朱俊俍
Original assignee: Suzhou UP Wear Resistance Compound Materials Co ltd
Current assignee: Suzhou UP Wear Resistance Compound Materials Co ltd
Priority date: 2017-09-01
Filing date: 2017-09-01
Publication date: 2020-04-03
Anticipated expiration: 2037-09-01
Also published as: CN107775211A

Abstract

The invention belongs to the technical field of metal materials, and relates to a flux-cored wire for wear-resistant hard surfacing, which comprises the components of C, Si, Mn, Cr, Mo, Al, Nb, Ti and Fe. The method can be used for manufacturing the surfacing plate with the hardness of the outer layer of the hard surface layer higher than that of the inner layer of the hard surface layer, and can effectively prevent the problem that the plate is easy to crack due to the inversion of hardness gradient.

Description

Flux-cored wire for wear-resistant hard-face surfacing

Technical Field

The invention relates to the technical field of metal materials, in particular to a flux-cored wire for wear-resistant hard surfacing.

Background

Flux-cored wires are common materials for hardfacing and are usually prepared by blending steel strips, main component alloy powder and other powder. It is widely applied to various industries such as cement, steel, power plants and the like. Flux-cored wires are various in variety, have different requirements in different fields, and have toughness to a certain extent besides the requirement of wear resistance, which is also an important requirement.

In order to make the overall hard surface layer have a certain degree of toughness, the design of the hard surface layer usually requires that the toughness of the inner layer of the hard surface layer is higher than that of the outer layer of the hard surface layer. Generally, compared with similar materials, the trend of toughness is opposite to the trend of hardness, that is, the hardness of the inner hard face layer is generally desired to be lower than that of the outer hard face layer, so as to avoid the hard face layer of the inner layer from being pulled by the outer hard face layer with higher toughness to be damaged or generate cracks. The hard surface layer having the above hardness gradient design is a hard surface layer having relatively high toughness as a whole.

For the flux-cored wire of the martensite type wear-resistant hard surface surfacing, under certain welding conditions, the influence of welding dilution is limited, and the hardness of the inner layer of the hard surface layer is sometimes higher than that of the outer layer of the hard surface layer. In such a case, the inner layer of the hard face layer is susceptible to tearing or cracking by the harder outer hard face layer. In the working condition of actual use, the risk of hard surface peeling and production equipment halt is increased.

The purpose of this patent is to provide a flux-cored wire material that makes the flux-cored wire build-up welding product show that outer hardness is higher than inboard hardness.

Disclosure of Invention

The invention mainly aims to provide a flux-cored wire for wear-resistant hard surfacing.

The invention realizes the purpose through the following technical scheme: a flux-cored wire for wear-resistant hard surfacing comprises the following components in percentage by mass:

specifically, the components by mass percent are as follows: 0.5 wt% C, 1.2 wt% Si, 1.5 wt% Mn, 5.3 wt% Cr, 0.7 wt% Mo, 0.4 wt% Al, 2.5 wt% Nb, 3.9 wt% Ti, 84.0 wt% Fe.

Specifically, the components by mass percent are as follows: 1.3 wt% C, 0.7 wt% Si, 0.4 wt% Mn, 3.8 wt% Cr, 1.5 wt% Mo, 0.9 wt% Al, 5.6 wt% Nb, 2.2 wt% Ti, 83.6 wt% Fe.

By adopting the technical scheme, the technical scheme of the invention has the beneficial effects that:

the method can be used for manufacturing the surfacing plate with the hardness of the outer layer of the hard surface layer higher than that of the inner layer of the hard surface layer, and can effectively prevent the problem that the plate is easy to crack due to the inversion of hardness gradient.

Drawings

FIG. 1 is a graph showing the change in experimental stress of HV-30 in comparative example 1, comparative example 2, example 1 and example 2.

The abscissa-1-0 in the figure represents the hard face inner layer; the abscissa 0 to 1 represents the outer layer of the hard face layer.

Detailed Description

A flux-cored wire for wear-resistant hard surfacing comprises the following components in percentage by mass:

the hardness of the inner layer of the hard surface layer with the new formula is influenced by the heat input during welding the outer layer of the hard surface layer, and the phenomenon of tempering and softening is generated, so that the hardness is lower, and the toughness is improved. The toughness is improved after the inner layer of the hard face layer is moderately softened.

The present invention will be described in further detail with reference to specific examples.

Examples 1 to 4:

flux-cored wires with the diameter of 3mm are prepared according to the composition table of table 1, then a hard surface layer is formed on an alloy plate in a surfacing mode by a conventional surfacing method, and the hardness value of the alloy is obtained by the alloy plate according to a Vickers hardness HV30 test method (a diamond square cone pressing device with the apex angle of 136 degrees is used for pressing the surface of the material under the load of 30 kg).

Comparative example 1:

the alloy plate was subjected to a test according to the Vickers hardness HV30 test method by overlaying a hard coat layer on the alloy plate by a conventional overlaying method using an ST600 type flux-cored wire.

Comparative example 2:

and overlaying a hard surface layer on the alloy plate by using a 258TIC flux-cored wire by using a conventional overlaying method, and testing the obtained alloy plate according to a Vickers hardness HV30 test method.

Table 1:

note: in the table, the portion with the component content less than 100 wt% is Fe.

As can be seen from table 1 and fig. 1, unlike comparative examples 1-2, the hardness of the hard surface layer of the sheets of examples 1-4 is always higher than that of the hard surface layer of the sheets of examples 1-4, and examples 1-4 have good hardness gradients.

What has been described above are merely some embodiments of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the inventive concept thereof, and these changes and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A flux-cored wire for wear-resistant hardfacing, comprising: the alloy comprises the following components in percentage by mass:

2. the flux-cored welding wire for hardfacing of claim 1, wherein: the components by mass percent are as follows: 0.5 wt% C, 1.2 wt% Si, 1.5 wt% Mn, 5.3 wt% Cr, 0.7 wt% Mo, 0.4 wt% Al, 2.5 wt% Nb, 3.9 wt% Ti, 84.0 wt% Fe.

3. The flux-cored welding wire for hardfacing of claim 1, wherein: the components by mass percent are as follows: 1.3 wt% C, 0.7 wt% Si, 0.4 wt% Mn, 3.8 wt% Cr, 1.5 wt% Mo, 0.9 wt% Al, 5.6 wt% Nb, 2.2 wt% Ti, 83.6 wt% Fe.