Corrosion-resistant steel for chain plates, method for manufacturing the same, and use thereof

Abstract

The application relates to the technical field of chain plate steel, and discloses a kind of corrosion-resistant chain plate steel and a preparation method and application thereof.The chain plate steel is composed of the following components by weight percentage: C 0.43%-0.49%, Mn 0.26%-0.86%, Co 0.03%-0.07%, Al 0.046%-0.14%, V 0.25%-0.35%, Ti 0.12%-0.25%, Cu 0.07%-0.38%, Mg 0.14%-0.26%, Tb 0.006%-0.025%, W 0.04%-0.16%, Mo 0.01%-0.06%, Sb 0.015%-0.036%, P<=0.022%, S<=0.013%, and the rest is iron and inevitable impurities.The above technical solution solves the problem of poor corrosion resistance of chain plate steel in related technologies.

Description

Technical Field

[0001] This invention relates to the field of steel for chain plates, specifically to a corrosion-resistant steel for chain plates, its preparation method, and its application. Background Technology

[0002] Chain plate steel is a type of steel specifically designed for manufacturing chain plates. As a key component of chains, chain plates play a crucial role in the transmission and conveying systems of numerous mechanical devices. For example, timing chains in automobile engines and drive chains in machine tools. Chain plates made of chain plate steel ensure reliable power transmission under high-speed operation and frequent start-stop cycles, guaranteeing normal equipment operation. However, when chain plates are used in outdoor environments or certain humid, corrosive industrial environments, especially those rich in chloride salts, their surfaces are highly susceptible to corrosion, leading to rust. This not only affects the appearance of the chain plates but also their performance. Currently, surface treatments are often used to improve corrosion resistance, but the improvement is limited, and when the external coating shows minor damage, it is difficult to determine the degree of corrosion of the internal steel.

[0003] Therefore, it is necessary to develop a type of steel for chain plates that can improve its internal corrosion resistance. This is of great significance for reducing the excessive reliance on surface treatment of chain plate steel, extending its service life, and reducing maintenance costs. Summary of the Invention

[0004] This invention proposes a corrosion-resistant steel for chain plates, its preparation method, and its application, solving the problem of poor corrosion resistance of chain plate steel in related technologies.

[0005] The technical solution of the present invention is as follows:

[0006] This invention proposes a corrosion-resistant steel for chain plates, composed of the following components by weight percentage:

[0007] C 0.43%~0.49%, Mn 0.26%~0.86%, Co 0.03%~0.07%, Al 0.046%~0.14%, V 0.25%~0.35%, Ti 0.12%~0.25%, Cu 0.07%~0.38%, Mg 0.14%~0.26%, Tb 0.006%~0.025%, W 0.04%~0.16%, Mo 0.01%~0.06%, Sb 0.015%~0.036%, P≤0.022%, S≤0.013%, with the remainder being iron and unavoidable impurities.

[0008] As a further technical solution, the weights of Cu, Sb and W satisfy the following relationship: 0.5≤(2Sb+W) / Cu≤1.

[0009] In this invention, when the weights of Cu, Sb, and W satisfy 0.5≤(2Sb+W) / Cu≤1, the resistance to chloride ion corrosion can be further improved, thereby further improving the corrosion resistance of the steel used for chain plates.

[0010] As a further technical solution, the weight ratio of W to Sb is 3:1.

[0011] This invention also proposes a method for preparing corrosion-resistant chain plate steel, comprising the following steps:

[0012] S1. The materials are prepared according to the stated weight percentages, smelted, and slag is removed to obtain molten steel;

[0013] S2. Refine the molten steel, continuously cast it, and slowly cool it to obtain a billet.

[0014] S3. Heat the billet, rough roll, finish roll, descale, and cool under controlled conditions after rolling to obtain a steel plate;

[0015] S4. The steel plate is heat-treated to obtain steel for chain plates.

[0016] As a further technical solution, the heat treatment is divided into a first heat treatment, a second heat treatment, a third heat treatment, and a fourth heat treatment.

[0017] In this invention, the heat treatment is divided into multiple stages, enabling precise control over the microstructural transformation of the steel at different stages. Different stages of heat treatment can gradually improve the microstructure of the steel, achieving an optimal balance between its strength and corrosion resistance.

[0018] As a further technical solution, during the first stage of heat treatment, the temperature is 900~1100℃, the treatment time is 40~60min, and the temperature is cooled to 150℃ at a cooling rate of 70~80℃ / min.

[0019] During the second stage of heat treatment, the temperature is 750~850℃, the treatment time is 30~50min, and the temperature is cooled to room temperature at a cooling rate of 70~80℃ / min.

[0020] During the third stage of heat treatment, the temperature is 400~540℃, the treatment time is 40~60min, and the temperature is cooled to room temperature at a cooling rate of 12~30℃ / min.

[0021] During the fourth stage of heat treatment, the temperature is 525~625℃, the treatment time is 2~3h, and the temperature is cooled to room temperature at a cooling rate of 12~30℃ / min.

[0022] During heat treatment, the cooling rate plays an important role in the stability of the internal structure of the steel plate. Reasonable control of the cooling rate in the segmented heat treatment process has an important impact on the yield strength of the steel for chain plates. When the cooling rates of the first and second heat treatments are each 70~80℃ / min, and the cooling rates of the third and fourth heat treatments are each 12~30℃ / min, the yield strength of the steel for chain plates can be improved.

[0023] As a further technical solution, the cooling rate of the third heat treatment is less than the cooling rate of the fourth heat treatment.

[0024] In this invention, when the cooling rate of the third heat treatment is less than that of the fourth heat treatment, the yield strength of the steel used for the chain plate can be further improved. However, when the cooling rate of the third heat treatment is greater than or equal to that of the fourth heat treatment, the internal stress of the steel cannot be fully eliminated, the structural stability of the steel is poor, and the yield strength of the steel used for the chain plate is affected.

[0025] As a further technical solution, the heating rate during the first heat treatment and the second heat treatment is independently 50~60℃ / min;

[0026] During the third and fourth heat treatment stages, the heating rate is independently 20~30℃ / min.

[0027] As a further technical solution, in step S3, during rough rolling, the initial rolling temperature is 900~1000℃, the final rolling temperature is 550~750℃, and the total reduction rate is 40%~50%;

[0028] During the finishing rolling process, the initial rolling temperature is 800~950℃, the final rolling temperature is 400~500℃, and the total reduction rate is 45%~55%.

[0029] As a further technical solution, in step S3, a water pressure of 12~18MPa is used for descaling.

[0030] During descaling, appropriate water pressure can ensure the descaling effect without damaging the steel surface, thus guaranteeing subsequent processing and product quality.

[0031] The present invention also proposes the application of the corrosion-resistant chain plate steel described above or the preparation method of the corrosion-resistant chain plate steel described above in the field of chain plates.

[0032] The working principle and beneficial effects of this invention are as follows:

[0033] In this invention, the steel used for the chain plates is composed of multiple elements such as Mn, Co, Al, V, Ti, Cu, Mg, Tb, W, Mo, and Sb. Among them, Ti and Al can form stable compounds with the C element in the steel, ensuring the structural integrity of the chain plates. Cu, W, and Sb have a synergistic effect; through the mutual cooperation of these three elements, a dense and stable internal structure can be obtained, which can effectively enhance the resistance to chloride ion corrosion, resulting in chain plate steel with good corrosion resistance. Detailed Implementation

[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] In the following examples and comparative examples, the content of Mn in the ferromanganese alloy is 65 wt%; the content of Co in the ferrocobalt alloy is 27 wt%; the content of Al in the ferroaluminum alloy is 80 wt%; the content of V in the ferrovanadium alloy is 40 wt%; the content of Ti in the ferrotitanium alloy is 32 wt%; the content of Cu in the ferrocopper alloy is 90 wt%; the content of Mg in the magnesium ingot is 99.9 wt%; the content of Tb in the terbium-cobalt alloy is 15 wt%; the content of W in the ferrotungsten alloy is 70 wt%; the content of Mo in the ferromolybdenum alloy is 60 wt%; and the content of Sb in the magnesium-antimony alloy is 20 wt%.

[0036] Example 1

[0037] A corrosion-resistant steel for chain plates is composed of the following components by weight percentage:

[0038] The composition is as follows: C 0.43%, Mn 0.26%, Co 0.03%, Al 0.046%, V 0.25%, Ti 0.12%, Cu 0.07%, Mg 0.14%, Tb 0.006%, W 0.04%, Mo 0.01%, Sb 0.015%, P 0.005%, S 0.003%, with the remainder being iron and unavoidable impurities.

[0039] Its preparation method includes the following steps:

[0040] S1. Manganese ferroalloy, iron cobalt alloy, aluminum ferroalloy, vanadium ferropowder, titanium ferroalloy, copper ferroalloy, magnesium ingot, terbium cobalt alloy, tungsten ferroalloy, molybdenum ferroalloy, magnesium antimony alloy and scrap steel are mixed according to the above weight percentages, smelted, and slag is removed to obtain molten steel.

[0041] S2. Refine the molten steel, continuously cast it, and slowly cool it to obtain a cast billet;

[0042] S3. The billet is heated, rough rolled, and finish rolled. Scale is descaled using 12MPa water pressure, followed by controlled cooling to obtain the steel plate. During rough rolling, the initial rolling temperature is 900℃, and the final rolling temperature is 550℃, with a total reduction rate of 40%. During finish rolling, the initial rolling temperature is 800℃, and the final rolling temperature is 400℃, with a total reduction rate of 45%.

[0043] S4. The steel plate undergoes a first stage of heat treatment: heating to 900℃ at a heating rate of 50℃ / min, treating at 900℃ for 60 minutes, and cooling to 150℃ at a cooling rate of 50℃ / min; a second stage of heat treatment: heating to 750℃ at a heating rate of 50℃ / min, treating at 750℃ for 50 minutes, and cooling to room temperature at a cooling rate of 50℃ / min; a third stage of heat treatment: heating to 400℃ at a heating rate of 20℃ / min, treating at 400℃ for 60 minutes, and cooling to room temperature at a cooling rate of 50℃ / min; and a fourth stage of heat treatment: heating to 525℃ at a heating rate of 20℃ / min, treating at 525℃ for 3 hours, and cooling to room temperature at a cooling rate of 50℃ / min to obtain the steel for the chain plate.

[0044] Example 2

[0045] A corrosion-resistant steel for chain plates is composed of the following components by weight percentage:

[0046] The composition is as follows: C 0.46%, Mn 0.56%, Co 0.05%, Al 0.08%, V 0.3%, Ti 0.17%, Cu 0.12%, Mg 0.2%, Tb 0.015%, W 0.102%, Mo 0.035%, Sb 0.034%, P 0.01%, S 0.006%, with the remainder being iron and unavoidable impurities.

[0047] Its preparation method includes the following steps:

[0048] S1. Manganese ferroalloy, iron cobalt alloy, aluminum ferroalloy, vanadium ferropowder, titanium ferroalloy, copper ferroalloy, magnesium ingot, terbium cobalt alloy, tungsten ferroalloy, molybdenum ferroalloy, magnesium antimony alloy and scrap steel are mixed according to the above weight percentages, smelted, and slag is removed to obtain molten steel.

[0049] S2. Refine the molten steel, continuously cast it, and slowly cool it to obtain a cast billet;

[0050] S3. The billet is heated, rough rolled, and finish rolled. Descaling is performed using 15MPa water pressure, followed by controlled cooling to obtain the steel plate. During rough rolling, the initial rolling temperature is 950℃, the final rolling temperature is 650℃, and the total reduction rate is controlled at 45%. During finish rolling, the initial rolling temperature is 870℃, the final rolling temperature is 450℃, and the total reduction rate is controlled at 50%.

[0051] S4. The steel plate undergoes a first stage of heat treatment: heating to 1000℃ at a heating rate of 55℃ / min, treating at 1000℃ for 50 min, and cooling to 150℃ at a cooling rate of 50℃ / min. A second stage of heat treatment is then performed: heating to 800℃ at a heating rate of 55℃ / min, treating at 800℃ for 40 min, and cooling to room temperature at a cooling rate of 50℃ / min. A third stage of heat treatment is performed: heating to 470℃ at a heating rate of 25℃ / min, treating at 470℃ for 50 min, and cooling to room temperature at a cooling rate of 50℃ / min. A fourth stage of heat treatment is performed: heating to 575℃ at a heating rate of 25℃ / min, treating at 575℃ for 2.5 h, and cooling to room temperature at a cooling rate of 50℃ / min, yielding the steel for the chain plate.

[0052] Example 3

[0053] A corrosion-resistant steel for chain plates is composed of the following components by weight percentage:

[0054] The composition is as follows: C 0.49%, Mn 0.86%, Co 0.07%, Al 0.14%, V 0.35%, Ti 0.25%, Cu 0.38%, Mg 0.26%, Tb 0.025%, W 0.16%, Mo 0.06%, Sb 0.036%, P 0.022%, S 0.013%, with the remainder being iron and unavoidable impurities.

[0055] Its preparation method includes the following steps:

[0056] S1. Manganese ferroalloy, iron cobalt alloy, aluminum ferroalloy, vanadium ferropowder, titanium ferroalloy, copper ferroalloy, magnesium ingot, terbium cobalt alloy, tungsten ferroalloy, molybdenum ferroalloy, magnesium antimony alloy and scrap steel are mixed according to the above weight percentages, smelted, and slag is removed to obtain molten steel.

[0057] S2. Refine the molten steel, continuously cast it, and slowly cool it to obtain a cast billet;

[0058] S3. The billet is heated, rough-rolled, and finish-rolled. Descaling is performed using 18MPa water pressure, followed by controlled cooling to obtain the steel plate. During rough rolling, the initial rolling temperature is 1000℃, and the final rolling temperature is 750℃, with a total reduction rate of 50%. During finish rolling, the initial rolling temperature is 950℃, and the final rolling temperature is 500℃. The total reduction rate is controlled at 55% during both rough and finish rolling.

[0059] S4. The steel plate undergoes a first stage of heat treatment: heating to 1100℃ at a heating rate of 60℃ / min, treating at 1100℃ for 40 minutes, and cooling to 150℃ at a cooling rate of 50℃ / min. A second stage of heat treatment is then performed: heating to 850℃ at a heating rate of 60℃ / min, treating at 850℃ for 30 minutes, and cooling to room temperature at a cooling rate of 50℃ / min. A third stage of heat treatment is performed: heating to 540℃ at a heating rate of 30℃ / min, treating at 540℃ for 40 minutes, and cooling to room temperature at a cooling rate of 50℃ / min. A fourth stage of heat treatment is performed: heating to 625℃ at a heating rate of 30℃ / min, treating at 625℃ for 2 hours, and cooling to room temperature at a cooling rate of 50℃ / min to obtain the steel for the chain plate.

[0060] Example 4

[0061] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Cu is 0.22%, the weight percentage of W is 0.048%, and the weight percentage of Sb is 0.016%.

[0062] Example 5

[0063] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Cu is 0.2%, the weight percentage of W is 0.06%, and the weight percentage of Sb is 0.02%.

[0064] Example 6

[0065] The only difference between this embodiment and Embodiment 2 is that in this embodiment, the weight percentage of Cu is 0.15%, the weight percentage of W is 0.09%, and the weight percentage of Sb is 0.03%.

[0066] Example 7

[0067] The only difference between this embodiment and embodiment 6 is that in this embodiment, the cooling rate of the first and second heat treatment stages is 90°C / min, and the cooling rate of the third and fourth heat treatment stages is 5°C / min.

[0068] Example 8

[0069] The only difference between this embodiment and embodiment 6 is that in this embodiment, the cooling rate of the first and second heat treatment stages is 50°C / min, and the cooling rate of the third and fourth heat treatment stages is 5°C / min.

[0070] Example 9

[0071] The only difference between this embodiment and embodiment 6 is that in this embodiment, the cooling rate of the first and second heat treatment stages is 90°C / min, and the cooling rate of the third and fourth heat treatment stages is 50°C / min.

[0072] Example 10

[0073] The only difference between this embodiment and embodiment 6 is that in this embodiment, the cooling rate of the first and second heat treatment stages is 70°C / min, and the cooling rate of the third and fourth heat treatment stages is 12°C / min.

[0074] Example 11

[0075] The only difference between this embodiment and embodiment 6 is that in this embodiment, the cooling rate of the first and second heat treatment stages is 80°C / min, and the cooling rate of the third and fourth heat treatment stages is 30°C / min.

[0076] Example 12

[0077] The only difference between this embodiment and Embodiment 11 is that, in this embodiment, the cooling rate of the fourth stage of heat treatment is 15°C / min.

[0078] Example 13

[0079] The only difference between this embodiment and embodiment 11 is that in this embodiment, the cooling rate of the third heat treatment stage is 15°C / min.

[0080] Comparative Example 1

[0081] The only difference between this comparative example and Example 1 is that Sb was not added in this comparative example, the weight percentage of W added was 0.055%, and the weight percentage of Cu added was 0.07%.

[0082] Comparative Example 2

[0083] The only difference between this comparative example and Example 1 is that W was not added in this comparative example, the weight percentage of Sb added was 0.055%, and the weight percentage of Cu added was 0.07%.

[0084] Comparative Example 3

[0085] The only difference between this comparative example and Example 1 is that Cu was not added in this comparative example, the weight percentage of Sb added was 0.03125%, and the weight percentage of W added was 0.9375%.

[0086] Comparative Example 4

[0087] The only difference between this comparative example and Example 1 is that Sb and W were not added in this comparative example, and the weight percentage of Cu added was 0.125%.

[0088] Comparative Example 5

[0089] The only difference between this comparative example and Example 1 is that Cu, Sb, and W were not added in this comparative example.

[0090] Experiment Example 1: Corrosion Resistance Test

[0091] The chain plate steels prepared in Examples 1-6 and Comparative Examples 1-5 were placed in a neutral salt spray corrosion environment containing 0.5% sodium chloride by mass for 360 hours. The salt spray corrosion rate of the chain plate steels was tested, and the test results are shown in Table 1 below:

[0092] Table 1. Corrosion resistance test results of Examples 1-6 and Comparative Examples 1-5

[0093]

[0094] As can be seen from Table 1, compared with Comparative Examples 1-5, the salt spray corrosion rate of Example 1 was reduced to 0.43 g·m. -2 ‧h -1 This indicates that the addition of Cu, Sb, and W improves the corrosion resistance of the steel used for chain plates.

[0095] Compared with Examples 2 and 4, the salt spray corrosion rate of Examples 5 and 6 was reduced to 0.27 g·m. -2 ‧h -1 The following shows that when the weights of Cu, Sb, and W satisfy 0.5 ≤ (2Sb + W) / Cu ≤ 1, the resistance to chloride ion corrosion can be further improved, and the corrosion resistance of the steel used for chain plates can be further improved.

[0096] Experimental Example 2: Yield Strength Test

[0097] The steel used for chain plates prepared in Examples 6-13 was subjected to yield strength testing according to the test methods in GB / T 228.1-2021 "Metallic materials, tensile testing—Part 1: Test at room temperature" at a test speed of 0.002 s. -1 The test results are the average of the five samples, and are shown in Table 2 below:

[0098] Table 2. Yield strength test results for Examples 6-13

[0099]

[0100] As can be seen from Table 2, the yield strength of Examples 10-11 is improved compared with Examples 6-9, indicating that the yield strength of the steel for the chain plate can be improved when the cooling rates of the first and second heat treatments are independently 70-80℃ / min, and the cooling rates of the third and fourth heat treatments are independently 12-30℃ / min.

[0101] Compared with Examples 11-12, the yield strength of Example 13 is improved, indicating that the yield strength of the steel for the chain plate can be further improved when the cooling rate of the third heat treatment is less than that of the fourth heat treatment.

[0102] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of corrosion-resistant steel for chain plates, characterized in that, It consists of the following components by weight percentage: C 0.43%~0.49%, Mn 0.26%~0.86%, Co 0.03%~0.07%, Al 0.046%~0.14%, V 0.25%~0.35%, Ti 0.12%~0.25%, Cu 0.07%~0.38%, Mg 0.14%~0.26%, Tb 0.006%~0.025%, W 0.04%~0.16%, Mo 0.01%~0.06%, Sb 0.015%~0.036%, P≤0.022%, S≤0.013%, with the remainder being iron and unavoidable impurities; The method for preparing corrosion-resistant chain plate steel includes the following steps: S1. The materials are prepared according to the stated weight percentages, smelted, and slag is removed to obtain molten steel; S2. Refine the molten steel, continuously cast it, and slowly cool it to obtain a billet. S3. Heat the billet, rough roll, finish roll, descale, and cool under controlled conditions after rolling to obtain a steel plate; S4. The steel plate is heat-treated to obtain steel for chain plates; The heat treatment is divided into a first heat treatment stage, a second heat treatment stage, a third heat treatment stage, and a fourth heat treatment stage. During the first stage of heat treatment, the temperature is 900~1100℃, the treatment time is 40~60min, and the temperature is cooled to 150℃ at a cooling rate of 70~80℃ / min. During the second stage of heat treatment, the temperature is 750~850℃, the treatment time is 30~50min, and the temperature is cooled to room temperature at a cooling rate of 70~80℃ / min. During the third stage of heat treatment, the temperature is 400~540℃, the treatment time is 40~60min, and the temperature is cooled to room temperature at a cooling rate of 12~30℃ / min. During the fourth stage of heat treatment, the temperature is 525~625℃, the treatment time is 2~3h, and the temperature is cooled to room temperature at a cooling rate of 12~30℃ / min.

2. The corrosion-resistant steel for chain plates according to claim 1, characterized in that, The weights of Cu, Sb, and W satisfy the following relationship: 0.5 ≤ (2Sb + W) / Cu ≤ 1.

3. The corrosion-resistant steel for chain plates according to claim 2, characterized in that, The weight ratio of W to Sb is 3:

1.

4. The corrosion-resistant steel for chain plates according to claim 1, characterized in that, The cooling rate of the third heat treatment stage is less than that of the fourth heat treatment stage.

5. The corrosion-resistant steel for chain plates according to claim 1, characterized in that, During the first and second heat treatment stages, the heating rate is independently 50~60℃ / min; During the third and fourth heat treatment stages, the heating rate is independently 20~30℃ / min.

6. The corrosion-resistant steel for chain plates according to claim 1, characterized in that, In step S3, during rough rolling, the initial rolling temperature is 900~1000℃, the final rolling temperature is 550~750℃, and the total reduction rate is 40%~50%. During the finishing rolling process, the initial rolling temperature is 800~950℃, the final rolling temperature is 400~500℃, and the total reduction rate is 45%~55%.

7. The corrosion-resistant steel for chain plates according to claim 1, characterized in that, In step S3, the descaling process is performed using a water pressure of 12-18 MPa.

8. The application of the corrosion-resistant steel for chain plates according to any one of claims 1 to 7 in the field of chain plates.

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