TWI813491B - Corrosion resistant steel and method for producing the same - Google Patents

Abstract

The present invention relates to a corrosion resistant steel and a method for producing the corrosion resistant steel. In the method for producing the corrosion resistant steel, a reheating, a hot rolling, a cooling with a specific temperature, and a coiling are performed on a steel slab with a specific composition, such that the resulted steel has a high corrosion resistance and predetermined mechanical properties, thereby being able to be applied to a pipe body for delivering a geothermal fluid.

Description

Corrosion-resistant steel and manufacturing method

The present invention relates to a corrosion-resistant steel material and a manufacturing method thereof, and in particular to a steel material having both high corrosion resistance and predetermined mechanical properties and a manufacturing method thereof.

Geothermal fluid is located under the ground. Because it has high temperature and contains high amounts of bicarbonate ions and other salt ions (such as chloride ions and sodium ions), the pipe body for transporting geothermal fluid (hereinafter referred to as the transport pipe body) must have Good corrosion resistance to resist high temperature corrosion. Secondly, the transportation pipe transports geothermal fluid from below the ground to the ground, so the transportation pipe must have high strength (such as tensile strength and yield strength) to resist the pressure generated by depth, thereby avoiding deformation or rupture of the pipe. Furthermore, the delivery pipe body also transports geothermal fluid to multiple user locations (such as outdoor hot spring pools and indoor bathhouses) at the same time. Therefore, the delivery pipe body must have good processability (such as appropriate elongation) to facilitate processing. Multi-joint pipe body. Specifically, the geothermal fluid includes hot spring water, and the material of the pipe body for transporting the geothermal fluid must generally be corrosion-resistant steel.

Commonly known corrosion-resistant steel materials usually use hot-dip galvanizing to form a coating (such as zinc plating) on the peripheral area of the steel material. This coating can protect the steel material from oxidation of the internal steel material, thereby enhancing and improving the corrosion resistance of the steel material. However, the strength of the coating is low and its thickness is very thin. Secondly, during the pipe making and joining process, the coating is easily scratched and the protective power of the steel is lost. Furthermore, the coating is not conducive to welding processing, and the coating is not suitable for use in humid environments, so it cannot be applied to pipes transporting geothermal fluids.

Another kind of corrosion-resistant steel has a high content of chromium (for example, more than 18 weight percent), which has a high cost and is prone to corrosion phenomena such as pitting corrosion to chloride ions, so it is not suitable for use in pipes for transporting geothermal fluids.

Therefore, there is an urgent need to develop a new corrosion-resistant steel and its manufacturing method to improve the above shortcomings.

In view of the above problems, one aspect of the present invention provides a method for manufacturing corrosion-resistant steel. This manufacturing method involves reheating, hot-rolling, cooling at a specific temperature, and coiling steel blanks with a specific composition, so that the steel produced has high corrosion resistance and predetermined mechanical properties, so that it can be used to transport geothermal fluids. The tube body.

Another aspect of the present invention provides a corrosion-resistant steel material. This steel is produced using the aforementioned manufacturing method of corrosion-resistant steel.

According to an aspect of the present invention, a method for manufacturing corrosion-resistant steel is provided. In this manufacturing method, a steel blank is provided, wherein the steel blank contains 0.05 to 0.15 weight percent phosphorus, 0.1 to 0.7 weight percent chromium, 0.3 to 1.0 weight percent copper, 0.3 to 1.0 weight percent nickel, 0.15 to 0.30 weight percent % carbon, 0.5 to 1.20 wt% manganese, 0.1 to 0.5 wt% silicon, 0.01 to 0.07 wt% aluminum, no more than 0.05 wt% sulfur, no more than 0.05 wt% calcium, no more than 0.1 wt% Molybdenum, not more than 0.02 weight percent nitrogen, the balance iron and unavoidable impurities, and the steel blank does not substantially contain niobium, titanium and vanadium. Then, the steel blank is reheated to obtain a heated steel blank, wherein the heating temperature of the reheating treatment is 1200°C to 1350°C. The heated steel blank is hot-rolled to obtain hot-rolled steel, where the completion temperature of the hot-rolling treatment is no more than 950°C. The hot-rolled steel is subjected to cooling treatment to obtain cooled steel, wherein the cooling rate of the cooling treatment is not less than 10°C/s and is cooled to 550°C to 720°C. The cooled steel is coiled to obtain corrosion-resistant steel.

According to an embodiment of the present invention, the steel blank substantially does not contain at least one of zinc, tin, zirconium, tungsten and cobalt.

According to another embodiment of the present invention, when the hot-rolled steel is cooled to 550°C to 650°C, the yield strength of the corrosion-resistant steel is greater than 480MPa, the tensile strength of the corrosion-resistant steel is greater than 650MPa, and the elongation of the corrosion-resistant steel is Not less than 19%, or when the hot-rolled steel is cooled to greater than 650°C and not greater than 720°C, the yield strength of the corrosion-resistant steel is not greater than 480MPa, the tensile strength of the corrosion-resistant steel is not greater than 650MPa, and the corrosion-resistant steel is The elongation is not less than 19%.

According to another embodiment of the invention, the manufacturing method optionally includes pickling the corrosion-resistant steel after the coiling process.

According to another embodiment of the present invention, the manufacturing method does not include coating processing.

According to another aspect of the present invention, a corrosion-resistant steel material is provided. This corrosion-resistant steel is produced using the aforementioned manufacturing method of corrosion-resistant steel, wherein at a temperature of 197°C to 203°C and a pressure of 15.5 bar, the corrosion rate of the corrosion-resistant steel by the fluid is less than 0.3mm/year, and the fluid contains 200ppm to 400ppm chloride ions, 850ppm to 1100 bicarbonate ions and 550ppm to 750ppm sodium ions, and the pH value of the fluid is 6.7 to 9.5.

According to another embodiment of the present invention, the metallographic structure of the corrosion-resistant steel includes a fat iron phase, a pulsatile iron phase and a toughened iron phase, the volume fraction of the fat iron phase is not greater than 60%, and the pulsatile iron phase And the total integral rate of toughened iron phase is not less than 40%.

According to another embodiment of the present invention, the ratio of the volume fraction of the fat iron phase to the total integral fraction of the wave iron phase and the toughened iron phase is not greater than 1.5.

According to another embodiment of the present invention, the metallographic structure substantially does not contain the Asada loose iron phase.

According to another embodiment of the present invention, the corrosion-resistant steel material does not include a coating.

The corrosion-resistant steel material and its manufacturing method of the present invention are applied, wherein the steel blank of a specific composition is reheated, hot-rolled, cooled at a specific temperature, and coiled, so that the produced steel material has high corrosion resistance and predetermined mechanical properties. , and the strength of steel is controlled by the cooling temperature.

The making and using of embodiments of the invention are discussed in detail below. It is to be appreciated, however, that the embodiments provide many applicable inventive concepts that can be embodied in a wide variety of specific contexts. The specific embodiments discussed are illustrative only and are not intended to limit the scope of the invention.

The manufacturing method of corrosion-resistant steel of the present invention reheats, hot-rolls, cools and coils steel blanks with a specific composition, so that the steel produced has high corrosion resistance and predetermined mechanical properties (that is, if you want mechanical properties), where the predetermined mechanical properties are controlled by the cooling temperature. The "corrosion resistance" referred to here refers to the ability of steel to resist oxygen oxidation in the environment and corrosion of fluids in contact with steel, and the corrosion resistance is measured by the corrosion rate measured in the autoclave test or geothermal field hanging test described below. Evaluation.

In addition, the "mechanical properties" referred to here refer to the strength and ductility of the steel, which can be measured using the yield strength, tensile strength and elongation tests described below. Yield strength and tensile strength are used to evaluate the strength of steel to resist deformation or rupture of the pipe wall caused by the pressure generated by the depth from the ground. Elongation can evaluate the ductility of steel, so it is closely related to formability.

The specific conditions for the predetermined mechanical properties are that the yield strength of the corrosion-resistant steel is not greater than 480MPa, the tensile strength is not greater than 650MPa, and the elongation is not less than 19%, or the yield strength of the corrosion-resistant steel is greater than 480MPa, and the tensile strength is Greater than 650MPa, and the elongation is not less than 19%.

Specifically, steel with higher strength (such as yield strength greater than 480 and tensile strength greater than 650) is produced by using lower cooling temperatures (such as 550°C to 650°C), while lower strength (eg yield strength is greater than 650°C) Steel materials with a tensile strength not greater than 480MPa and a tensile strength not greater than 650MPa) are produced using higher cooling temperatures (such as greater than 650°C and not greater than 720°C).

Referring to FIG. 1 , a method 100 for manufacturing corrosion-resistant steel material first provides a steel blank, as shown in operation 110 . This steel blank contains phosphorus, chromium, copper, nickel, carbon, manganese, silicon, aluminum, sulfur, calcium, molybdenum, nitrogen, the balance of iron, and unavoidable impurities, and does not contain substantially niobium, titanium and vanadium. These elements are discussed in detail below.

Phosphorus, chromium, copper and nickel can exert a synergistic effect to improve the corrosion resistance of steel. In detail, the steel blank has 0.05 to 0.15 weight percent phosphorus, 0.1 to 0.7 weight percent chromium, 0.3 to 1.0 weight percent copper, and 0.3 to 1.0 weight percent nickel. The surface of the steel made from this steel blank has Phosphorus, chromium, copper and nickel combine with oxygen in the air to form a dense oxide layer on the surface of the steel to prevent the steel inside from being oxidized by oxygen in the atmosphere and corroded by fluids in contact with the steel. For example, chromium can combine with oxygen to form chromium oxide.

If the content of any one of the aforementioned four elements is not within the aforementioned corresponding range, the corrosion resistance of the steel produced will be reduced. Preferably, the phosphorus content can be 0.08 to 0.12 weight percent, the chromium content can be 0.2 to 0.4 weight percent, the copper content can be 0.5 to 0.6 weight percent, and the nickel content can be 0.4 to 0.5 weight percent. More preferably, the content ratio of phosphorus to chromium can be 1:2 to 1:4, the content ratio of phosphorus to copper can be 1:5 to 1:6, and the content ratio of phosphorus to nickel can be 1:4 to 1 :5.

Carbon is an interstitial atom in steel and can effectively increase the strength of steel. 0.15 to 0.30% by weight of carbon can cause the steel blank to produce a metallographic structure of pulverized iron phase and toughened iron phase after reheating, hot rolling and cooling treatment, and the resulting steel will be modified according to the temperature of the cooling treatment. Have predetermined mechanical properties. To elaborate, during the cooling process, carbides (such as snow carbon iron and chromium carbide) are precipitated in the metallographic structure to increase the strength of the steel. If the carbon content is high (for example, higher than 0.30 weight percent), the elongation of the steel is likely to be lower than the predetermined range. If the carbon content is low (such as less than 0.15 weight percent), the tensile strength cannot reach the predetermined strength (such as above 650MPa).

Manganese is a substitutional atom in steel, and manganese can increase the strength of steel. 0.5 to 1.20 weight percent manganese can increase the strength of steel during the cooling process. If the manganese content is higher than 1.20% by weight, the processability of the steel will be reduced (for example, it is not conducive to welding). On the contrary, if the manganese content is less than 0.5 weight percent, the strength of the steel is lower than the predetermined range.

Silicon is a solid solution strengthening element that facilitates the metallographic structure of the steel to increase the strength of the steel during cooling. The silicon content is 0.1 to 0.5 weight percent. This appropriate silicon content can increase the strength of the steel and also improve its weldability. And help subsequent tube production.

Aluminum is a deoxidizer added during the refining of molten steel. It combines with the oxygen in the molten steel to prevent residual oxygen in the steel from producing holes. Holes will significantly deteriorate the mechanical properties of steel such as strength and elongation. If the aluminum content is too little, deoxidation will be incomplete. If the aluminum content is too much, there will be no oxygen to bind, and it will not bring other benefits, but will only increase the cost. A suitable aluminum content is 0.01 to 0.07 weight percent, and preferably 0.037 to 0.06 weight percent.

In addition to the aforementioned elements, the steel blank also contains sulfur, calcium, molybdenum and nitrogen. The contents of sulfur, calcium, molybdenum and nitrogen are respectively no more than 0.05 weight percent, no more than 0.05 weight percent, no more than 0.1 weight percent and no more than 0.02 weight percent, and preferably, the contents of sulfur, calcium, molybdenum and nitrogen are respectively It is no more than 0.01 weight percent, no more than 0.02 weight percent, no more than 0.04 weight percent and no more than 0.01 weight percent. If the content of any one of sulfur, calcium, molybdenum and nitrogen is not within the corresponding range mentioned above, the corrosion resistance of the steel will be reduced and the strength of the steel will be lower than the predetermined range.

The steel blank of the present invention does not substantially contain niobium, titanium and vanadium. Since niobium, titanium and vanadium are all expensive metals, the corrosion-resistant steel manufacturing method 100 of the present invention excludes the use of these metals to reduce costs. Furthermore, without using such metals, the manufacturing method 100 can still improve the corrosion resistance of the steel and/or adjust the strength of the steel within a predetermined range through cooling temperature, so the manufacturing method 100 has better advantages.

In addition, as mentioned above, since the corrosion-resistant steel produced by the corrosion-resistant steel manufacturing method 100 of the present invention already has good corrosion resistance, there is no need to perform coating treatment (such as galvanizing treatment) on the surface of the steel. Simplify the manufacturing process and reduce costs.

In some embodiments, the steel blank substantially does not contain at least one of zinc, tin, zirconium, tungsten and cobalt, so as to facilitate adjusting the strength of the steel within a predetermined range through cooling temperature.

After operation 110 , the steel blank is reheated to obtain a heated steel blank, as shown in operation 120 . The heating temperature of this reheating treatment is 1200°C to 1350°C, so that the metallographic phase of the steel blank will all become the Worthfield iron phase, which will facilitate the transformation of the Worthfield iron phase into other metallurgical phases (such as fertilizer grains) in subsequent processes. Iron phase, wave iron phase and toughened iron phase).

After operation 120 , the heated steel blank is subjected to a hot rolling process to obtain a hot-rolled steel product, as shown in operation 130 . The completion temperature of this hot rolling treatment is controlled to be above the phase transformation temperature (called Ar ₃ temperature) at which the Worthfield iron phase transforms into the fertile iron phase, for example, no more than 950°C, and preferably 800°C to 900°C. .

After operation 130 , the hot-rolled steel material is cooled to obtain a cooled steel material, as shown in operation 140 . During the cooling process, the aforementioned Worthfield iron phase transforms into the fertile iron phase, the pulverized iron phase and the toughened iron phase, and carbides are precipitated, so that the steel has the required mechanical properties. The cooling rate of the cooling treatment is not less than 10°C/s, and preferably is 10°C/s to 100°C/s. If the cooling rate is less than 10°C/s, the Worthfield iron phase will easily transform into too much fat iron phase, so the strength of the steel will be lower than the predetermined range.

During cooling treatment, the hot-rolled steel is cooled to 550°C to 720°C. Based on the mechanical properties to be obtained, the hot-rolled steel can be cooled to 550°C to 650°C or greater than 650°C and not greater than 720°C. The aforementioned cooling temperature can control the number of carbides precipitated in the metallographic structure, thereby affecting the strength of the steel produced. For example, lower temperatures (such as 550°C to 650°C) can refine the metallographic structure and precipitate more toughened iron phases of carbides, so that the steel has higher strength. Higher temperatures (such as greater than 650°C and not greater than 720°C) can cause less carbide precipitation to produce steel with lower strength.

To elaborate, when the cooling temperature of the cooling treatment is 550°C to 650°C, the yield strength of the steel produced is greater than 480MPa, the tensile strength is greater than 650MPa, and the elongation is not less than 19%. When the cooling temperature is greater than 650°C and not greater than 720°C, the yield strength of the steel produced is not greater than 480MPa, the tensile strength is not greater than 650MPa, and the elongation is not less than 19%. Accordingly, the method 100 for manufacturing corrosion-resistant steel can simply use different cooling temperatures to produce corrosion-resistant steel with predetermined mechanical properties. Furthermore, compared with the conventional manufacturing method of corrosion-resistant steel using coating, the manufacturing method 100 of the present invention is simpler, less time-consuming, and lower in cost.

After operation 140 , the cooled steel material is coiled to obtain corrosion-resistant steel material, as shown in operation 150 .

After the coiling process, the manufacturing method 100 may optionally include pickling the corrosion-resistant steel material to remove scale formed on the surface of the corrosion-resistant steel material during the manufacturing process.

Another aspect of the present invention provides a corrosion-resistant steel material. This corrosion-resistant steel material is produced using the aforementioned manufacturing method of corrosion-resistant steel material. The corrosion resistance of this steel is evaluated by the corrosion rate. At a temperature of 197°C to 203°C and a pressure of 15.5 bar (bar), the corrosion rate of the fluid on the steel is less than 0.3mm/y (i.e. mm/year) , and preferably less than 0.2mm/y. The aforementioned fluid contains 850 ppm to 1100 bicarbonate ions, 200 ppm to 400 ppm chloride ions, and 550 ppm to 750 ppm sodium ions, and its pH value is 6.7 to 9.5. Preferably, this fluid system is derived from geothermal fluid to truly reflect the corrosion resistance of geothermal fluid to steel.

As mentioned before, the strength of corrosion-resistant steel is controlled by the cooling temperature of the cooling process. For example, in some embodiments, the corrosion-resistant steel has a yield strength of no more than 480 MPa, a tensile strength of no more than 650 MPa, and an elongation of no less than 19%. In other embodiments, the corrosion-resistant steel has a yield strength greater than 480 MPa, a tensile strength greater than 650 MPa, and an elongation not less than 19%. With good corrosion resistance and predetermined mechanical properties, steel can be produced by using different cooling temperatures of the cooling process in response to the different requirements (such as high strength and workability) generated by the location where geothermal fluid is transported, so it can be used in transportation Geothermal fluid tube. In some specific examples, the yield strength, tensile strength and elongation of the pipe body made of corrosion-resistant steel can meet the specifications of various pipe bodies.

In some embodiments, the metallographic structure of the corrosion-resistant steel includes a ferrite phase, a pulverized iron phase and a toughened iron phase. The volume fraction of the fertile iron phase is not greater than 60%, and the pulverized iron phase and toughened iron phase are not more than 60%. The overall integral rate of the iron phase is not less than 40%. When the metallographic structure of corrosion-resistant steel meets the above conditions, the steel will have superior corrosion resistance and its mechanical properties will be more in line with expectations.

In some specific examples, the ratio of the volume fraction of the fat-grained iron phase to the total integral fraction of the wavelet iron phase and the toughened iron phase is not greater than 1.5, and is preferably 0.5 to 1.5. When the aforementioned ratio is within the aforementioned range, the mechanical properties of the steel can be more in line with expectations.

In these embodiments, the metallographic structure of the corrosion-resistant steel material does not substantially contain the Asada iron phase, so that the mechanical properties of the steel material are more in line with expectations. In addition, the wave iron phase in the metallographic structure can include carbides, such as snow carbon iron and chromium carbide, to make the mechanical properties of the steel more in line with expectations.

On the other hand, the corrosion-resistant steel of the present invention has a dense oxide layer formed on the surface of the steel by combining phosphorus, chromium, copper and nickel with oxygen. This oxide layer improves the corrosion resistance of the steel. Therefore, the corrosion-resistant steel of the present invention does not Contains plating. Accordingly, compared with conventional corrosion-resistant steel materials, in addition to better corrosion resistance, the corrosion-resistant steel material of the present invention can also have better processability (eg, facilitate welding).

Manufacturing of corrosion-resistant steel

Example 1

The steel blanks were prepared according to the composition shown in Table 1 below, and were reheated, hot rolled, cooled and coiled to obtain the corrosion-resistant steel of Example 1. Then, the corrosion-resistant steel material was sequentially subjected to pipe making processing to obtain a pipe body with a pipe wall thickness of 10 mm, and the steel material was evaluated using the evaluation method described below.

Example 2 and Comparative Examples 1 to 2

The steel materials of Example 2 and Comparative Examples 1 to 2 were produced by the same method as Example 1. The difference is that Example 2 and Comparative Examples 1 to 2 change the composition of the steel blank and the cooling conditions. The specific conditions and evaluation results of the aforementioned Examples 1 to 2 and Comparative Examples 1 to 2 are shown in Table 1 below.

Evaluation method

1. Yield strength, tensile strength and elongation

According to the standard method API 5CT, the yield strength, tensile strength and elongation of the pipe made of corrosion-resistant steel were measured.

2. Corrosion rate measured by autoclave test

The pipe body made of corrosion-resistant steel is immersed in the solution retrieved from the geothermal field. At a temperature of 197°C to 203°C and a pressure of 15.5 bar, the corrosion thickness of the pipe body is recorded over the immersion time. And converted into the corrosion thickness of the pipe body soaked for one year, that is, the thickness reduction rate per year, it represents the corrosion rate, and the measured corrosion rate is used to evaluate the corrosion resistance of the corrosion-resistant steel. When the corrosion rate is smaller, the corrosion resistance of corrosion-resistant steel is better.

The composition of the aforementioned solution includes 950 ppm bicarbonate ions, 653 ppm sodium ions, 331 ppm chloride ions, 58 ppm sulfate ions, 4 ppm fluoride ions, 3 ppm lithium ions, 32 ppm potassium ions, 1 ppm ammonium ions, 2ppm magnesium ions and 4ppm calcium ions, the pH value of the solution is 8.9, the conductivity is 2.820mS/cm, and the suspended solids are 1.8ppm.

3. Corrosion rate measured by hanging test at geothermal field

Pipes made of corrosion-resistant steel are used for solution transportation in geothermal sites. Over time, the corrosion thickness of the heat pipe is recorded and converted into the corrosion thickness of the pipe for one year, that is, the thickness decreases every year. The corrosion rate is expressed in mm/y (millimeters/year), and the measured corrosion rate is used to evaluate the corrosion resistance of corrosion-resistant steel. When the corrosion rate is smaller, the corrosion resistance of corrosion-resistant steel is better. For example, as far as the geothermal field hanging test is concerned, when the corrosion rate is not greater than 0.08mm/y (i.e. mm/year), the steel has good corrosion resistance.

Table 1

Please refer to Table 1. Examples 1 to 2 use steel blanks with appropriate compositions to produce steel with good corrosion resistance. Furthermore, corrosion-resistant steel materials of different strengths can be produced by adjusting the cooling temperature. For example, Example 1 uses a lower temperature to refine the metallographic structure and precipitate more high-strength carbides, thereby forming the wave iron phase and the toughened iron phase, thereby improving the strength of the steel (such as Yield strength and tensile strength).

However, both Comparative Examples 1 and 2 used steel blanks with inappropriate composition, such as too low phosphorus content, copper content and nickel content, and too high manganese content. In addition, the chromium content of the steel blank in Comparative Example 2 is also too low, so the steel materials produced in Comparative Examples 1 and 2 do not have good corrosion resistance.

In summary, in the corrosion-resistant steel material and its manufacturing method of the present invention, the steel blank of a specific composition is reheated, hot-rolled, cooled at a specific temperature, and coiled, so that the steel produced has high corrosion resistance and Predetermined mechanical properties. Specifically, high-strength steel is produced using low cooling temperatures; conversely, low-strength steel is produced using high cooling temperatures.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the technical field to which the present invention belongs can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended patent application scope.

100:Method 110,120,130,140,150: Operation

In order to have a more complete understanding of the embodiments of the present invention and its advantages, please refer to the following description together with the corresponding drawings. It must be emphasized that various features are not drawn to scale and are for illustration purposes only. The relevant diagram content is explained as follows: FIG. 1 is a flow chart illustrating a method for manufacturing corrosion-resistant steel according to an embodiment of the present invention.

100:Method

110,120,130,140,150: Operation

Claims (10)

A method of manufacturing corrosion-resistant steel, including: A steel blank is provided, wherein the steel blank contains: 0.05 to 0.15 weight percent phosphorus; 0.1 to 0.7 weight percent chromium; 0.3 to 1.0 weight percent copper; 0.3 to 1.0 weight percent nickel; 0.15 to 0.30 weight percent carbon; 0.5 to 1.20 weight percent manganese; 0.1 to 0.5 weight percent silicon; 0.01 to 0.07 weight percent aluminum; Not more than 0.05 weight percent sulfur; Not more than 0.05% by weight of calcium; Not more than 0.1 weight percent molybdenum; Not more than 0.02 weight percent nitrogen; balance of iron; and unavoidable impurities, The steel blank does not substantially contain niobium, titanium and vanadium; Performing a reheating process on the steel blank to obtain a heated steel blank, wherein a heating temperature of the reheating process is 1200°C to 1350°C; Performing a hot rolling process on the heated steel blank to obtain a hot rolled steel product, wherein the completion temperature of the hot rolling process is no more than 950°C; Performing a cooling process on the hot-rolled steel material to obtain a cooled steel material, wherein a cooling rate of the cooling process is not less than 10°C/s and is cooled to 550°C to 720°C; and The cooled steel material is subjected to a coil processing to obtain the corrosion-resistant steel material. The manufacturing method of corrosion-resistant steel as described in claim 1, wherein the steel blank does not substantially contain at least one of zinc, tin, zirconium, tungsten and cobalt. The manufacturing method of corrosion-resistant steel as described in claim 1, wherein when the hot-rolled steel is cooled to 550°C to 650°C, a yield strength of the corrosion-resistant steel is greater than 480MPa, and a tensile strength of the corrosion-resistant steel is The strength is greater than 650MPa, and the elongation of one of the corrosion-resistant steel materials is not less than 19%, or when the hot-rolled steel is cooled to greater than 650℃ and not greater than 720℃, the yield strength of one of the corrosion-resistant steel materials is not greater than 480MPa, The tensile strength of the corrosion-resistant steel material is not greater than 650MPa, and the elongation of the corrosion-resistant steel material is not less than 19%. The manufacturing method of corrosion-resistant steel as claimed in claim 1, wherein after the coiling process, the manufacturing method further includes performing a pickling treatment on the corrosion-resistant steel. The manufacturing method of corrosion-resistant steel as claimed in claim 1, wherein the manufacturing method does not include a coating treatment. A kind of corrosion-resistant steel material, produced by the manufacturing method of corrosion-resistant steel material as described in any one of claims 1 to 5, wherein at a temperature of 197°C to 203°C and a pressure of 15.5 bar, a fluid The corrosion rate of the corrosion-resistant steel is less than 0.3mm/year, the fluid contains 200ppm to 400ppm chloride ions, 850ppm to 1100ppm bicarbonate ions, and 550ppm to 750ppm sodium ions, and a pH value of the fluid is 6.7 to 9.5. The corrosion-resistant steel material as described in claim 6, wherein the metallographic structure of the corrosion-resistant steel material includes a fat-grained iron phase, a wave iron phase and a toughened iron phase, and the volume fraction of the fat-grained iron phase is not It is greater than 60%, and the total integral ratio of one of the wavered iron phase and the toughened iron phase is not less than 40%. The corrosion-resistant steel as claimed in claim 7, wherein a ratio of the volume fraction of the ferrous iron phase to the total integral fraction of the wave iron phase and the toughened iron phase is not greater than 1.5. The corrosion-resistant steel as claimed in claim 7, wherein the metallographic structure does not substantially contain a loose iron phase. The corrosion-resistant steel material of claim 6, wherein the corrosion-resistant steel material does not include a coating.

Images