CN112371726B

CN112371726B - Rolling method of wire rod for rare earth-containing electric arc welding

Info

Publication number: CN112371726B
Application number: CN202010909338.4A
Authority: CN
Inventors: 吕刚; 涛雅; 赵晓敏; 杨鲁明; 白月琴; 赵家琪
Original assignee: Baotou Iron and Steel Group Co Ltd
Current assignee: Baotou Iron and Steel Group Co Ltd
Priority date: 2020-09-02
Filing date: 2020-09-02
Publication date: 2022-09-20
Anticipated expiration: 2040-09-02
Also published as: CN112371726A

Abstract

The invention discloses a rolling method of a wire rod for rare earth-containing electric arc welding, which adopts a high spinning temperature and delayed cooling process for controlled cooling, wherein: the initial rolling temperature is 950 +/-30 ℃, the finish rolling temperature is 920 +/-20 ℃, and the spinning temperature is 930 +/-20 ℃; during cooling, the stelmor cooling fan is closed, the heat-insulating cover is closed, and the speed of the cooling roller way is as follows: 0.40m/s, 0.41m/s, 0.42m/s, 0.43m/s, 0.44m/s, 0.45m/s, 0.46m/s, 0.51m/s, 0.57m/s, 0.75 m/s. The method of the invention can ensure that the wire rod obtains ideal structures of ferrite and pearlite so as to meet the performance requirements.

Description

Rolling method of wire rod for rare earth-containing electric arc welding

Technical Field

The invention relates to the technical field of metallurgy, in particular to a rolling method of a wire rod for rare earth-containing arc welding.

Background

The H08A steel bar is a common welding steel, is mainly used for producing welding rods, and has the characteristics of low carbon and low silicon, and the rare earth has a good improvement effect on the welding performance of the steel bar, and can improve the corrosion resistance and the low-temperature impact toughness of a welding line.

Disclosure of Invention

The invention aims to provide a rolling method of a wire rod for rare earth-containing H08A arc welding on the basis of H08A welding rod steel production, so as to ensure that the wire rod obtains ideal structures of ferrite and pearlite to meet performance requirements.

In order to solve the technical problems, the invention adopts the following technical scheme:

a rolling method of a wire rod for rare earth-containing electric arc welding adopts a high spinning temperature and a delayed cooling process for controlled cooling, wherein: the initial rolling temperature is 950 +/-30 ℃, the finish rolling temperature is 920 +/-20 ℃, and the spinning temperature is 930 +/-20 ℃; during cooling, the stelmor cooling fan is closed, the heat-insulating cover is closed, and the speed of the cooling roller way is as follows: 0.40m/s, 0.41m/s, 0.42m/s, 0.43m/s, 0.44m/s, 0.45m/s, 0.46m/s, 0.51m/s, 0.57m/s or 0.75 m/s.

Further, the chemical components of the wire rod comprise, by mass: less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.40-0.50 percent of Mn, 0.0009-0.0020 percent of RE element Ce, and the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S in the impurities is less than or equal to 0.020 percent.

Further, the chemical components of the wire rod comprise, by mass: 0.06% of C, 0.01% of Si, 0.41% of Mn, 9ppm of RE element Ce, and the balance of Fe and inevitable impurities, wherein P is 0.0120% and S is 0.011%.

Further, the chemical components of the wire rod comprise, by mass: 0.05% of C, 0.02% of Si, 0.43% of Mn, 10ppm of RE element Ce, and the balance of Fe and inevitable impurities, wherein P is 0.0170% and S is 0.012% in the impurities.

Further, the chemical components of the wire rod comprise, by mass: 0.07% of C, 0.02% of Si, 0.45% of Mn, 12ppm of RE element Ce, and the balance of Fe and inevitable impurities, wherein P in the impurities is 0.0160% and S in the impurities is 0.013%.

Compared with the prior art, the invention has the beneficial technical effects that:

the mechanical property of the wire rod prepared by the method meets the use requirement, and particularly has good elongation.

Detailed Description

A rolling method of a wire rod for rare earth-containing electric arc welding is used for ensuring the obtainment of ideal structures of ferrite and pearlite, controlled cooling is carried out by adopting a high spinning temperature and a delay type cooling process according to the characteristics of steel grades, a stelmor cooling fan is closed, a heat-insulating cover is closed, and the speed of a cooling roller way is as follows: 0.40m/s, 0.41m/s, 0.42m/s, 0.43m/s, 0.44m/s, 0.45m/s, 0.46m/s, 0.51m/s, 0.57m/s or 0.75 m/s.

TABLE 1 Rolling temperature (. degree. C.)

	Initial rolling temperature	Finish rolling temperature	Temperature of spinning
				Example 1	978	921	935
Example 2	975	923	936
				Example 3	971	925	934
Example 4	972	926	930
				Example 5	978	924	932
Example 6	974	921	935
				Example 7	973	925	932
Example 8	971	921	931

TABLE 2 Final Components (wt%)

	C	Si	Mn	P	S	RE(ppm)
							Example 1	0.06	0.01	0.41	0.012	0.011	9
Example 2	0.05	0.02	0.43	0.017	0.012	10
							Example 3	0.06	0.01	0.45	0.018	0.013	11
Example 4	0.05	0.02	0.43	0.017	0.014	10
							Example 5	0.07	0.01	0.44	0.016	0.015	10
Example 6	0.06	0.02	0.42	0.017	0.014	11
							Example 7	0.07	0.02	0.45	0.016	0.013	12
Example 8	0.07	0.01	0.43	0.018	0.014	10

TABLE 3 mechanical Properties

	Rm/MPa	Rel/MPa	A/％	Z/％
					Example 1	330	242	43	74
Example 2	340	245	44	75
					Example 3	351	251	42	71
Example 4	355	247	43	72
					Example 5	342	257	41	73
Example 6	346	256	43	74
					Example 7	348	255	44	75
Example 8	350	253	42	70
					Require that	≤370	≤300	≥30	≥60

The above-mentioned embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A rolling method of a wire rod for rare earth-containing electric arc welding is characterized in that controlled cooling is carried out by adopting a high spinning temperature and a delayed cooling process, wherein: the initial rolling temperature is 950 +/-30 ℃, the finish rolling temperature is 920 +/-20 ℃, and the spinning temperature is 930 +/-20 ℃; during cooling, the stelmor cooling fan is closed, the heat-insulating cover is closed, and the speed of the cooling roller way is as follows: 0.40m/s, 0.41m/s, 0.42m/s, 0.43m/s, 0.44m/s, 0.45m/s, 0.46m/s, 0.51m/s, 0.57m/s or 0.75 m/s;

the wire rod comprises the following chemical components in percentage by mass: less than or equal to 0.08 percent of C, less than or equal to 0.03 percent of Si, 0.40-0.50 percent of Mn0.0009-0.0020 percent of RE element, the balance of Fe and inevitable impurities, wherein P in the impurities is less than or equal to 0.020 percent, and S in the impurities is less than or equal to 0.020 percent.

2. A rolling method of a wire rod for rare earth-containing arc welding according to claim 1, wherein the wire rod has a chemical composition comprising, in mass percent: 0.06% of C, 0.01% of Si, 0.41% of Mn, 9ppm of RE element, and the balance of Fe and inevitable impurities, wherein P is 0.0120% and S is 0.011%.

3. A rolling method of a wire rod for rare earth-containing arc welding according to claim 1, wherein the wire rod has a chemical composition comprising, in mass percent: 0.05% of C, 0.02% of Si, 0.43% of Mn, 10ppm of RE element, and the balance of Fe and inevitable impurities, wherein P is 0.0170% and S is 0.012% in the impurities.

4. A rolling method of a wire rod for rare earth-containing arc welding according to claim 1, wherein the wire rod has a chemical composition comprising, in mass percent: 0.07% of C, 0.02% of Si, 0.45% of Mn, 12ppm of RE element, and the balance of Fe and inevitable impurities, wherein P is 0.0160% and S is 0.013% in the impurities.