CN111299899A

CN111299899A - Marine atmosphere corrosion resistant steel matched gas shielded welding wire rod, welding wire and application

Info

Publication number: CN111299899A
Application number: CN201911266505.1A
Authority: CN
Inventors: 侯云昌; 张强; 李仕臣; 周秀
Original assignee: Tianjin Yongchang Welding Wire Co Ltd
Current assignee: Tianjin Yongchang Welding Wire Co Ltd
Priority date: 2019-12-11
Filing date: 2019-12-11
Publication date: 2020-06-19

Abstract

The invention relates to a gas shielded welding wire rod matched with marine atmospheric corrosion resistant steel, which comprises the following components in percentage by weight: c is less than or equal to 0.012 percent; s is less than or equal to 0.015 percent; 0.50 to 1.80 percent of Mn0; si is less than or equal to 0.70 percent; p is less than or equal to 0.025 percent; mo is less than or equal to 0.35 percent; ni1.30% -1.90%; cu is less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe; the welding wire comprises the following components in percentage by weight: c is less than or equal to 0.012 percent; s is less than or equal to 0.015 percent; 0.50 to 1.80 percent of Mn0; si is less than or equal to 0.70 percent; p is less than or equal to 0.025 percent; mo is less than or equal to 0.35 percent; ni1.30% -1.90%; cu is less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe; the gas-shielded welding wire is applied to 55 kg-level marine atmospheric corrosion resistant steel. The invention is matched with 55 kg-level ocean atmosphere corrosion resistant steel for use, and various properties of deposited metal meet the requirements of corresponding parent metal.

Description

Marine atmosphere corrosion resistant steel matched gas shielded welding wire rod, welding wire and application

Technical Field

The invention belongs to the technical field of metal materials, and particularly relates to a gas shielded welding wire rod and a welding wire matched with marine atmospheric corrosion resistant steel, and application thereof.

Background

With the development of bridge construction in China towards high speed, heavy load and large span, in order to guarantee the operation safety and the service life of the bridge, the weather-resistant steel concept is already applied to bridge construction. Such as the Hangzhou Bay sea-crossing bridge constructed in 2007 and the Nanjing Dasheng Guanchangjiang bridge constructed in 2011. Nowadays, large bridges in construction and planning in China are mainly concentrated in coastal economically developed areas, the atmospheric characteristics in the areas show industrial-marine atmospheric environments along with the industrial development and the increase of automobile holding capacity, and steel and welding materials resistant to marine atmospheric corrosion in the environments are a brand-new development area.

In recent years, with the continuous approval of the replacement standard of the marine corrosion-resistant steel, the marine atmospheric corrosion-resistant steel gradually replaces the coating steel to become the mainstream of the corrosion protection mode of the sea-crossing bridge. Due to the enhancement of economic strength and the improvement of technological level in China, many ocean bridge projects are also completed in succession, such as Maltav bridges, high-speed rail sea-crossing bridges and the like. Therefore, the research on the marine atmospheric corrosion resistant steel and welding materials is not slow at all. For bridge steel resisting marine atmospheric corrosion, saddle steel has completed the research of Q345NH, Q420NH, Q500NH and other series steel grades, and the matched welding material is still blank at present. The welding wire is a 55 kg-level ocean atmospheric corrosion resistant steel matched gas-shielded welding wire.

Therefore, based on the problems, the marine atmospheric corrosion resistant steel matched gas-shielded welding wire rod and the welding wire and the application thereof in 55 kg-level marine atmospheric corrosion resistant steel matched gas-shielded welding wires are provided, and the method has important practical significance.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a gas-shielded welding wire rod and a welding wire matched with marine atmospheric corrosion resistant steel and application thereof in 55 kg-level gas-shielded welding wires matched with marine atmospheric corrosion resistant steel.

The technical problem to be solved by the invention is realized by adopting the following technical scheme:

a gas shield welding wire rod matched with marine atmospheric corrosion resistant steel comprises the following components in percentage by weight: c: less than or equal to 0.012 percent; s: less than or equal to 0.015 percent; mn: 0.50% -1.80%; si: less than or equal to 0.70 percent; p: less than or equal to 0.025 percent; mo: less than or equal to 0.35 percent; ni: 1.30% -1.90%; cu: less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe.

The marine atmospheric corrosion resistant steel gas shield welding wire prepared from the wire rod comprises the following components in percentage by weight: c: less than or equal to 0.012 percent; s: less than or equal to 0.015 percent; mn: 0.50% -1.80%; si: less than or equal to 0.70 percent; p: less than or equal to 0.025 percent; mo: less than or equal to 0.35 percent; ni: 1.30% -1.90%; cu: less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe.

It should be noted that the wire rod and the method for preparing the welding wire from the wire rod are both the existing methods for preparing the wire rod or the welding wire, and are not described herein again.

The application of the gas-shielded welding wire matched with the marine atmospheric corrosion resistant steel in 55 kg grade gas-shielded welding wires matched with the marine atmospheric corrosion resistant steel.

The invention has the advantages and positive effects that:

1. the welding wire takes molybdenum, nickel, copper, phosphorus and silicon as guarantee elements of corrosion resistance indexes, and realizes that the mechanical properties of deposited metal meet the following requirements through an alloy system of carbon, manganese, silicon and molybdenum: the tensile strength Rm of the metal is more than or equal to 550MPa, the yield strength ReL is more than or equal to 450MPa, the elongation A is more than or equal to 22 percent, and the impact toughness KV at-40 ℃ of the deposited metal₂Impact toughness KV at-20 ℃ of not less than 60J₂More than or equal to 100, and various properties of the deposited metal meet the requirements of corresponding parent metal;

2. the corrosion resistance index range of deposited metal of the welding wire is 1.06-1.89, the highest crack resistance sensitivity coefficient is less than 0.27, and the crack resistance performance is good.

Detailed Description

First, it should be noted that the specific structures, features, advantages, etc. of the present invention will be specifically described below by way of example, but all the descriptions are for illustrative purposes only and should not be construed as limiting the present invention in any way. Furthermore, any individual technical features described or implicit in the embodiments mentioned herein may still be continued in any combination or subtraction between these technical features (or their equivalents) to obtain still further embodiments of the invention that may not be mentioned directly herein.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

Example one

Processing the wire rod according to the existing welding wire production process to obtain the marine atmospheric corrosion resistant steel matched gas-shielded welding wire, wherein the gas-shielded welding wire comprises the following components in percentage by weight: c: less than or equal to 0.012 percent; s: less than or equal to 0.015 percent; mn: 0.50% -1.80%; si: less than or equal to 0.70 percent; p: less than or equal to 0.025 percent; mo: less than or equal to 0.35 percent; ni: 1.30% -1.90%; cu: less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe.

Example two

The wire rod is processed according to the existing welding wire production process to prepare 5 copper-plated welding wires with the diameter of 1.2mm, and the chemical components (wt%) of the copper-plated welding wires are shown in the following table 1:

TABLE 1

The above 5 welding wires were welded under the welding process data of table 2:

TABLE 2

The welding method comprises the following steps:	hand welding	Specification of welding wire	Specification of welding	Protective gas
					Welding position	Flat welding (PA)	1.2	300A/30V	(80％Ar+20％CO₂)

The deposited metal formed after welding had the chemical composition (wt%) shown in table 3:

TABLE 3

Element(s)	C	S	Mn	Si	P	Ni	Mo	Ti	Cu
										1#	0.064	0.007	1.20	0.34	0.015	1.42	0.20	0.020	0.35
2#	0.065	0.005	1.19	0.32	0.013	1.45	0.22	0.021	0.30
										3#	0.066	0.007	1.22	0.33	0.013	1.44	0.21	0.022	0.31
4#	0.067	0.007	1.21	0.34	0.015	1.45	0.21	0.020	0.31
										5#	0.064	0.006	1.18	0.33	0.014	1.44	0.22	0.021	0.32

The deposited metals in table 3 were tested and their mechanical properties are shown in table 4:

TABLE 4

In addition, crack resistance and corrosion resistance calculation are carried out on the deposited metal;

wherein, the crack sensitivity coefficient resistant formula is as follows:

P_cm＝C+(Mn+Cr+Cu)/20+Si/30+Mo/15+Ni/60+V/10+5B；

in the formula, all alloy elements are substituted according to the weight proportion of chemical elements; calculated P_cmThe range is as follows: 0.05-0.21, and the highest crack resistance sensitivity coefficient of the material is less than 0.27, which shows that the crack resistance of the material is better.

The corrosion resistance index calculation formula of the deposited metal is as follows:

V＝1/U＝1/{(1.0-0.16*C)*(1.05-0.05*Si)*(1.04-0.016*Mn)*(1.0-0.5*P)*(1.0+1.9*S)*(1.0-0.10*Cu)*(1.0-0.12*Ni)*(1.0-0.3*Mo)*(1.0-1.7*Ti)}

in the formula, all alloy elements are substituted according to the weight proportion of chemical elements;

the calculated V value ranges are: 1.06-1.89.

As can be seen from the above, the welding wire of the present invention is made of molybdenum and nickelCopper, phosphorus and silicon are guaranteed elements of corrosion resistance indexes, and the mechanical properties of deposited metal are met through an alloy system of carbon, manganese, silicon and molybdenum: rm is more than or equal to 550MPa, ReL is more than or equal to 450MPa, A is more than or equal to 22 percent, KV is at 40 DEG C₂Not less than 60J and KV at-20 DEG C₂Not less than 100J, and various performances of the deposited metal meet the requirements of corresponding parent metal.

The present invention has been described in detail with reference to the above examples, but the description is only for the preferred examples of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.

Claims

1. The utility model provides a supporting gas shield welding wire rod of resistant ocean atmospheric corrosion steel which characterized in that: the gas shielded welding wire rod comprises the following components in percentage by weight: c: less than or equal to 0.012 percent; s: less than or equal to 0.015 percent; mn: 0.50% -1.80%; si: less than or equal to 0.70 percent; p: less than or equal to 0.025 percent; mo: less than or equal to 0.35 percent; ni: 1.30% -1.90%; cu: less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe.

2. The marine atmospheric corrosion resistant steel wire rod matched gas-shielded welding wire prepared from the wire rod of claim 1, which is characterized in that: the gas shield welding wire comprises the following components in percentage by weight: c: less than or equal to 0.012 percent; s: less than or equal to 0.015 percent; mn: 0.50% -1.80%; si: less than or equal to 0.70 percent; p: less than or equal to 0.025 percent; mo: less than or equal to 0.35 percent; ni: 1.30% -1.90%; cu: less than or equal to 0.50 percent; ti is less than or equal to 0.12 percent; the balance being Fe.

3. The application of the marine atmospheric corrosion resistant steel matched gas-shielded welding wire in claim 2 in 55 kg-level marine atmospheric corrosion resistant steel matched gas-shielded welding wires.