1. The high-strength corrosion-resistant alloy steel forged circle is characterized by being prepared from steel ingots containing the following chemical components in percentage by mass: 0.25 to 0.35% of C, 0.25 to 0.45% of Si, 0.4 to 0.7% of Mn, 0.01% or less of P, 0.01% or less of S, 0.2 to 0.4% of Cr, 0.1 to 0.2% of Ni, 0.1 to 0.3% of Mo, 0.03 to 0.06% of Pr, 0.01 to 0.03% of Co, 0.02 to 0.05% of Sr, 0.03 to 0.06% of Ga, 0.01 to 0.03% of Re, and the balance of iron.

2. The high strength corrosion resistant alloy steel forged circle of claim 1, wherein the method for manufacturing the high strength corrosion resistant alloy steel forged circle comprises the following steps:

step S1, preparing an alloy steel forging circle by adopting continuous casting and continuous rolling;

step S2, surface treatment is carried out on the alloy steel forging circle: cleaning the alloy steel forging circle by using a cleaning machine, washing by using a detergent, and drying at the temperature of 100-;

step S3, heat treatment: and normalizing, tempering, quenching and annealing the alloy steel forged circle in sequence to obtain the high-strength corrosion-resistant alloy steel forged circle.

3. The high-strength corrosion-resistant alloy steel forged circle according to claim 2, wherein the continuous casting and rolling process in step S1 is specifically as follows: the temperature of the front box shaft furnace is controlled to be 1050-1250 ℃ during continuous casting; the temperature of the holding furnace is 850-950 ℃, and the temperature of the casting cooling water is 20-25 ℃; the temperature edge part of the outlet plate belt of the casting machine is 680-780 ℃; the finishing temperature is controlled to be 550-650 ℃, and the temperature of the cleaning pipe is 70-80 ℃.

4. The high strength corrosion resistant alloy steel forged steel circle according to claim 2, wherein the detergent in step S1 comprises the following components in parts by weight: 3-5 parts of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, 2-4 parts of hyperbranched sulfonate surfactant and 60-80 parts of water.

5. The high-strength corrosion-resistant alloy steel forged circle as claimed in claim 2, wherein the normalizing temperature is 580- & 680 ℃ and the holding time is 30-40 minutes in step S3; the tempering temperature is 400-600 ℃, and the heat preservation time is 1-2 hours.

6. The high-strength corrosion-resistant alloy steel forged circle according to claim 2, wherein the quenching in step S3 is performed by heating to 850-900 ℃ and then cooling to room temperature at an average cooling rate of 33-38 ℃/sec; the annealing temperature is 500-550 ℃, and the annealing time is 1-2 hours.

Background

In recent years, with the rapid development of various related industries in the equipment manufacturing industry in China, the demand of steel materials is continuously rising, and simultaneously, higher and higher requirements are provided for the comprehensive performance of the steel materials.

The alloy steel forging circle has different performance requirements according to different application scenes, such as high low-temperature impact resistance, high heat resistance, high corrosion resistance, high strength and the like. The strength and the corrosion resistance are basic properties which all forged circles should have, and the strength and the corrosion resistance become two important indexes for evaluating the grade of the forged circle of the alloy steel. The existing alloy forged round has the defects of insufficient strength, poor impact resistance and further improved corrosion resistance due to the selection of steel ingot formula, forging process and heat treatment mode.

For example, chinese patent document CN 109022738B relates to a method for preparing a low temperature impact resistant CrMo alloy steel forged circle, the preparation objects include alloy steels with the designations AISI 4130, 4130 and 30CrMo, the adopted process route includes multi-stage heating of a steel ingot to 1180-1230 ℃, heat preservation for 3-6.5 hours, then forging and forming at 1200-800 ℃, and air cooling; and normalizing at 900 +/-10 ℃, quenching in water at 880 +/-10 ℃ and tempering at 670 +/-10 ℃ to obtain a tempered sorbite structure with good comprehensive performance in the forged circle, thereby effectively solving the technical requirement that the impact toughness Akv under the low-temperature environment of-60 ℃ reaches more than 30J. However, the tensile strength and corrosion resistance thereof are to be further improved.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the high-strength corrosion-resistant alloy steel forged circle and the preparation method thereof, and the preparation method has the advantages of simple process, convenient operation and control, high product qualification rate, high preparation efficiency and low energy consumption; the high-strength corrosion-resistant alloy steel forged round prepared by the preparation method has the advantages of high low-temperature impact resistance, high heat resistance, high corrosion resistance, high strength and long service life.

In order to achieve the purpose, the invention adopts the technical scheme that: the high-strength corrosion-resistant alloy steel forged circle is characterized by being prepared from steel ingots containing the following chemical components in percentage by mass: 0.25 to 0.35% of C, 0.25 to 0.45% of Si, 0.4 to 0.7% of Mn, 0.01% or less of P, 0.01% or less of S, 0.2 to 0.4% of Cr, 0.1 to 0.2% of Ni, 0.1 to 0.3% of Mo, 0.03 to 0.06% of Pr, 0.01 to 0.03% of Co, 0.02 to 0.05% of Sr, 0.03 to 0.06% of Ga, 0.01 to 0.03% of Re, and the balance of iron.

Another object of the present invention is to provide a method for preparing the high strength corrosion resistant alloy steel forged circle, which comprises the following steps:

step S1, preparing an alloy steel forging circle by adopting continuous casting and continuous rolling;

step S2, surface treatment is carried out on the alloy steel forging circle: cleaning the alloy steel forging circle by using a cleaning machine, washing by using a detergent, and drying at the temperature of 100-;

step S3, heat treatment: and normalizing, tempering, quenching and annealing the alloy steel forged circle in sequence to obtain the high-strength corrosion-resistant alloy steel forged circle.

Preferably, the continuous casting and rolling process in step S1 specifically includes: the temperature of the front box shaft furnace is controlled to be 1050-1250 ℃ during continuous casting; the temperature of the holding furnace is 850-950 ℃, and the temperature of the casting cooling water is 20-25 ℃; the temperature edge part of the outlet plate belt of the casting machine is 680-780 ℃; the final rolling temperature is controlled to be 550-650 ℃, and the temperature of the cleaning pipe is 70-80 ℃;

preferably, the detergent in step S1 is prepared from the following components in parts by weight: 3-5 parts of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, 2-4 parts of hyperbranched sulfonate surfactant and 60-80 parts of water.

Preferably, the preparation method of the hyperbranched sulfonate surfactant is referred to CN102690641A example 1.

Preferably, the normalizing temperature 580-680 ℃ in the step S3, and the heat preservation time is 30-40 minutes; the tempering temperature is 400-600 ℃, and the heat preservation time is 1-2 hours.

Preferably, the quenching in the step S3 is performed by heating to 850-900 ℃, and then cooling to room temperature at an average cooling speed of 33-38 ℃/S; the annealing temperature is 500-550 ℃, and the annealing time is 1-2 hours.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention provides a high-strength corrosion-resistant alloy steel forged circle and a preparation method thereof, and the preparation method has the advantages of simple process, convenience in operation and control, high product qualification rate, high preparation efficiency and low energy consumption; the high-strength corrosion-resistant alloy steel forged round prepared by the preparation method has the advantages of high low-temperature impact resistance, high heat resistance, high corrosion resistance, high strength and long service life.

Detailed Description

The following detailed description of preferred embodiments of the invention will be made.

The high-strength corrosion-resistant alloy steel forged circle is characterized by being prepared from steel ingots containing the following chemical components in percentage by mass: 0.25 to 0.35% of C, 0.25 to 0.45% of Si, 0.4 to 0.7% of Mn, 0.01% or less of P, 0.01% or less of S, 0.2 to 0.4% of Cr, 0.1 to 0.2% of Ni, 0.1 to 0.3% of Mo, 0.03 to 0.06% of Pr, 0.01 to 0.03% of Co, 0.02 to 0.05% of Sr, 0.03 to 0.06% of Ga, 0.01 to 0.03% of Re, and the balance of iron.

Another object of the present invention is to provide a method for preparing the high strength corrosion resistant alloy steel forged circle, which comprises the following steps:

step S1, preparing an alloy steel forging circle by adopting continuous casting and continuous rolling;

step S2, surface treatment is carried out on the alloy steel forging circle: cleaning the alloy steel forging circle by using a cleaning machine, washing by using a detergent, and drying at the temperature of 100-;

step S3, heat treatment: and normalizing, tempering, quenching and annealing the alloy steel forged circle in sequence to obtain the high-strength corrosion-resistant alloy steel forged circle.

Preferably, the continuous casting and rolling process in step S1 specifically includes: the temperature of the front box shaft furnace is controlled to be 1050-1250 ℃ during continuous casting; the temperature of the holding furnace is 850-950 ℃, and the temperature of the casting cooling water is 20-25 ℃; the temperature edge part of the outlet plate belt of the casting machine is 680-780 ℃; the final rolling temperature is controlled to be 550-650 ℃, and the temperature of the cleaning pipe is 70-80 ℃;

preferably, the detergent in step S1 is prepared from the following components in parts by weight: 3-5 parts of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, 2-4 parts of hyperbranched sulfonate surfactant and 60-80 parts of water.

Preferably, the preparation method of the hyperbranched sulfonate surfactant is referred to CN102690641A example 1.

Preferably, the normalizing temperature 580-680 ℃ in the step S3, and the heat preservation time is 30-40 minutes; the tempering temperature is 400-600 ℃, and the heat preservation time is 1-2 hours.

Preferably, the quenching in the step S3 is performed by heating to 850-900 ℃, and then cooling to room temperature at an average cooling speed of 33-38 ℃/S; the annealing temperature is 500-550 ℃, and the annealing time is 1-2 hours.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention provides a high-strength corrosion-resistant alloy steel forged circle and a preparation method thereof, and the preparation method has the advantages of simple process, convenience in operation and control, high product qualification rate, high preparation efficiency and low energy consumption; the high-strength corrosion-resistant alloy steel forged round prepared by the preparation method has the advantages of high low-temperature impact resistance, high heat resistance, high corrosion resistance, high strength and long service life.

The invention will be further described with reference to specific examples, but the scope of protection of the invention is not limited thereto:

example 1

The embodiment provides a high-strength corrosion-resistant alloy steel forged circle, which is characterized by being made of steel ingots containing the following chemical components in percentage by mass: 0.25% of C, 0.25% of Si, 0.4% of Mn, 0.01% or less of P, 0.01% or less of S, 0.2% of Cr, 0.1% of Ni, 0.1% of Mo, 0.03% of Pr, 0.01% of Co, 0.02% of Sr, 0.03% of Ga, 0.01% of Re, and the balance of Fe.

The preparation method of the high-strength corrosion-resistant alloy steel forged circle is characterized by comprising the following steps of:

step S1, preparing an alloy steel forging circle by adopting continuous casting and continuous rolling;

step S2, surface treatment is carried out on the alloy steel forging circle: cleaning the forged alloy steel circle by using a cleaning machine, washing the forged alloy steel circle by using a detergent, and drying the forged alloy steel circle to constant weight at 100 ℃;

step S3, heat treatment: and normalizing, tempering, quenching and annealing the alloy steel forged circle in sequence to obtain the high-strength corrosion-resistant alloy steel forged circle.

The continuous casting and rolling process in the step S1 specifically includes: the temperature of the front box shaft furnace is controlled to 1050 ℃ during continuous casting; the temperature of the holding furnace is 850 ℃, and the temperature of the casting cooling water is 20 ℃; the temperature edge of the outlet plate belt of the casting machine is 680 ℃; the finishing temperature is controlled at 550 ℃, and the temperature of the cleaning pipe is 70 ℃;

the detergent in the step S1 is prepared from the following components in parts by weight: 3 parts of N, N-bis (2-hydroxyethyl) -2-aminoethanesulfonic acid, 2 parts of hyperbranched sulfonate surfactant and 60 parts of water.

Normalizing at 580 deg.C for 30 min in step S3; the tempering temperature is 400 ℃, and the heat preservation time is 1 hour.

In the step S3, the quenching is carried out by heating to 850 ℃ and then cooling to room temperature at the average cooling speed of 33-38 ℃/S; the annealing is specifically carried out at the annealing temperature of 500 ℃ for 1 hour.

Example 2

The present example provides a high-strength corrosion-resistant alloy steel forged circle, whose formulation and preparation method are substantially the same as those of example 1, except that the forged circle is made of a steel ingot containing the following chemical components by mass percent: 0.29% of C, 0.3% of Si, 0.5% of Mn, 0.01% or less of P, 0.01% or less of S, 0.25% of Cr, 0.13% of Ni, 0.15% of Mo, 0.04% of Pr, 0.015% of Co, 0.03% of Sr, 0.04% of Ga, 0.015% of Re, and the balance of iron.

Example 3

The present example provides a high-strength corrosion-resistant alloy steel forged circle, whose formulation and preparation method are substantially the same as those of example 1, except that the forged circle is made of a steel ingot containing the following chemical components by mass percent: 0.3% of C, 0.35% of Si, 0.55% of Mn, less than or equal to 0.01% of P, less than or equal to 0.01% of S, 0.3% of Cr, 0.15% of Ni, 0.2% of Mo, 0.045% of Pr, 0.02% of Co, 0.035% of Sr, 0.045% of Ga, 0.02% of Re and the balance of iron.

Example 4

The present example provides a high-strength corrosion-resistant alloy steel forged circle, whose formulation and preparation method are substantially the same as those of example 1, except that the forged circle is made of a steel ingot containing the following chemical components by mass percent: 0.33% of C, 0.4% of Si, 0.65% of Mn, 0.01% or less of P, 0.01% or less of S, 0.35% of Cr, 0.18% of Ni, 0.25% of Mo, 0.055% of Pr, 0.025% of Co, 0.045% of Sr, 0.055% of Ga, 0.025% of Re, and the balance of Fe.

Example 5

The present example provides a high-strength corrosion-resistant alloy steel forged circle, whose formulation and preparation method are substantially the same as those of example 1, except that the forged circle is made of a steel ingot containing the following chemical components by mass percent: 0.35% of C, 0.45% of Si, 0.7% of Mn, 0.01% or less of P, 0.01% or less of S, 0.4% of Cr, 0.2% of Ni, 0.3% of Mo, 0.06% of Pr, 0.03% of Co, 0.05% of Sr, 0.06% of Ga, 0.03% of Re, and the balance of Fe.

Comparative example 1

The present example provides a high strength corrosion resistant alloy steel forged circle, whose formulation and preparation method are substantially the same as those of example 1, except that Sr is not added; the heat treatment does not include normalizing.

Comparative example 2

The present example provides a high strength corrosion resistant alloy steel forged round, the formulation and preparation method of which are substantially the same as those of example 1, except that no Ga is added; the heat treatment does not include tempering.

Comparative example 3

The present example provides a high strength corrosion resistant alloy steel forged circle, the formulation and preparation method of which are substantially the same as those of example 1, except that no Re is added; the heat treatment does not include a quenching treatment.

In order to further illustrate the beneficial technical effects of the products of the embodiments of the present application, the high-strength corrosion-resistant alloy steel forged round manufactured by the embodiments of the present application is subjected to related performance tests, and the test results are shown in table 1.

TABLE 1

Item	Corrosion rate (g/m)2·h)	Tensile strength (MPa)	Yield strength (MPa)
				Example 1	0.0558	722	605
Example 2	0.0543	729	612
				Example 3	0.0630	737	621
Example 4	0.0617	747	629
				Example 5	0.0506	754	635
Comparative example 1	0.0812	695	557
				Comparative example 2	0.0805	681	549
Comparative example 3	0.0816	677	543

As can be seen from the data in Table 1, the products of the examples of this application have higher strength and corrosion resistance than the comparative examples, which is a result of the alloy formulation and the combined action of the steps.

The above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.