Corrosion-resistant chain plate steel as well as preparation method and application thereof

Abstract

The invention relates to the technical field of steel for chain plates, and provides corrosion-resistant steel for a chain plate as well as a preparation method and application of the corrosion-resistant steel. The steel for the chain plate is prepared from the following components in percentage by weight: 0.43 percent to 0.49 percent of C, 0.26 percent to 0.86 percent of Mn, 0.03 percent to 0.07 percent of Co, 0.046 percent to 0.14 percent of Al, 0.25 percent to 0.35 percent of V, 0.12 percent to 0.25 percent of Ti, 0.07 percent to 0.38 percent of Cu, 0.14 percent to 0.26 percent of Mg, 0.006 percent to 0.025 percent of Tb, 0.04 percent to 0.16 percent of W, 0.01 percent to 0.06 percent of Mo, 0.015 percent to 0.036 percent of Sb, less than or equal to 0.022 percent of P, less than or equal to 0.013 percent of S and the balance of iron and inevitable impurities. Through the technical scheme, the problem of poor corrosion resistance of the steel for the chain plate in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chain plate steel, in particular, relates to a kind of corrosion-resistant chain plate steel and its preparation method and application. BACKGROUND

[0002] Chain plate steel is a kind of steel material specially used for manufacturing chain plate, and chain plate, as a key component of chain, plays an important role in the transmission and conveying system of many mechanical equipment. For example, the timing chain of automobile engine, the transmission chain of machine tool, etc., the chain plate made of chain plate steel can ensure that the chain can reliably transmit power under high-speed operation, frequent start-stop, and ensure the normal operation of the equipment. However, when the chain plate is applied in outdoor environment or some humid and corrosive industrial environment, especially in the environment rich in chloride salt, its surface is easily eroded, and rust phenomenon occurs, which not only affects the appearance of the chain plate, but also affects its performance. At present, the surface of steel is often treated to improve corrosion resistance, but the corrosion resistance is limited, and when the external coating is slightly damaged, it is difficult to determine the corrosion degree of the internal steel.

[0003] Therefore, it is necessary to develop a kind of chain plate steel, which can improve its internal corrosion resistance, which is of great significance to reduce the over-reliance of chain plate steel on surface treatment, prolong the service life of chain plate steel and reduce maintenance cost. SUMMARY

[0004] The present application provides a kind of corrosion-resistant chain plate steel and its preparation method and application, solve the problem of poor corrosion resistance of chain plate steel in the related art.

[0005] The technical scheme of the present application is as follows: The present application provides a kind of corrosion-resistant chain plate steel, which 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%, the rest is iron and its inevitable impurities.

[0006] As a further technical solution, the weight of Cu, Sb and W satisfies the following relationship: 0.5≤(2Sb+W) / Cu≤1.

[0007] When the weight of Cu, Sb and W satisfies 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 for chain plate.

[0008] As a further technical solution, the weight ratio of the W and the Sb is 3:1.

[0009] The application also provides a preparation method of the corrosion-resistant steel for chain plate, comprising the following steps: S1, according to the weight percentage of the component, the molten steel is obtained by smelting and slagging; S2, the molten steel is refined, continuous casting, slow cooling, and the cast blank is obtained; S3, the cast blank is heated, rough rolling, finish rolling, descaling, and the steel plate is obtained after rolling and controlled cooling; S4, the steel plate is heat treated to obtain the steel for chain plate.

[0010] As a further technical solution, the heat treatment is divided into first, second, third and fourth heat treatments.

[0011] In the application, the heat treatment is divided into multiple stages, which can accurately control the microstructure transformation of the steel at different stages. The heat treatment at different stages can gradually improve the microstructure of the steel, so that the strength and corrosion resistance of the steel reach the best balance state.

[0012] As a further technical solution, in the first heat treatment, the temperature is 900-1100 DEG C, the treatment time is 40-60 min, and the cooling rate is 70-80 DEG C / min to 150 DEG C; In the second heat treatment, the temperature is 750-850 DEG C, the treatment time is 30-50 min, and the cooling rate is 70-80 DEG C / min to room temperature; In the third heat treatment, the temperature is 400-540 DEG C, the treatment time is 40-60 min, and the cooling rate is 12-30 DEG C / min to room temperature; In the fourth heat treatment, the temperature is 525-625 DEG C, the treatment time is 2-3 h, and the cooling rate is 12-30 DEG C / min to room temperature.

[0013] During the heat treatment process, 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 process of segmented heat treatment has an important influence on the yield strength of the steel for chain plate. When the cooling rates of the first and second heat treatments are independently 70-80 DEG C / min, and the cooling rates of the third and fourth heat treatments are independently 12-30 DEG C / min, the yield strength of the steel for chain plate can be improved.

[0014] As a further technical solution, the cooling rate of the third heat treatment is less than the cooling rate of the fourth heat treatment.

[0015] In the present application, when the cooling rate of the third heat treatment is less than the cooling rate of the fourth heat treatment, the yield strength of the chain plate steel can be further improved, and when the cooling rate of the third heat treatment is greater than or equal to the cooling rate of the fourth heat treatment, the internal stress of the steel cannot be fully eliminated, the stability of the steel microstructure is poor, and the yield strength of the chain plate steel is affected.

[0016] As a further technical solution, the heating rate of the first heat treatment and the second heat treatment is independently 50~60℃ / min; The heating rate of the third heat treatment and the fourth heat treatment is independently 20~30℃ / min.

[0017] As a further technical solution, in step S3, during rough rolling, the rough rolling temperature is 900~1000℃, the finish rolling temperature is 550~750℃, and the total reduction is 40%~50%; During finish rolling, the rough rolling temperature is 800~950℃, the finish rolling temperature is 400~500℃, and the total reduction is 45%~55%.

[0018] As a further technical solution, in step S3, during descaling, a water pressure of 12~18MPa is used for descaling.

[0019] During descaling, appropriate water pressure can ensure the descaling effect and will not damage the surface of the steel, providing protection for subsequent processing and product quality.

[0020] The present application also proposes the use of the chain plate steel prepared by the preparation method of the corrosion-resistant chain plate steel or any one of the corrosion-resistant chain plate steels in chain plates.

[0021] The working principle and beneficial effects of the present application are as follows: In the present application, the chain plate steel is composed of Mn, Co, Al, V, Ti, Cu, Mg, Tb, W, Mo, Sb and other elements, among which Ti and Al can form stable compounds with C elements in the steel, which can ensure the structural integrity of the chain plate. Cu, W and Sb have a synergistic effect, and through the mutual cooperation of the three elements, a dense and stable internal structure can be obtained, which can effectively enhance the resistance to chloride ion corrosion, and obtain a chain plate steel with good corrosion resistance. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0023] In the following examples and comparative examples, the content of Mn in the manganese-iron alloy is 65wt%; the content of Co in the iron-cobalt alloy is 27wt%; the content of Al in the aluminum-iron alloy is 80wt%; the content of V in the vanadium-iron is 40wt%; the content of Ti in the titanium-iron alloy is 32wt%; the content of Cu in the copper-iron alloy is 90wt%; the content of Mg in the magnesium ingot is 99.9wt%; the content of Tb in the terbium-cobalt alloy is 15wt%; the content of W in the tungsten-iron alloy is 70wt%; the content of Mo in the molybdenum-iron alloy is 60wt%; and the content of Sb in the magnesium-antimony alloy is 20wt%.

[0024] Example 1 A kind of corrosion-resistant chain plate steel, which is composed of the following components by weight percentage: 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%, and the rest is iron and its inevitable impurities; A preparation method thereof, comprising the following steps: S1, the manganese-iron alloy, iron-cobalt alloy, aluminum-iron alloy, vanadium-iron powder, titanium-iron alloy, copper-iron alloy, magnesium ingot, terbium-cobalt alloy, tungsten-iron alloy, molybdenum-iron alloy, magnesium-antimony alloy and scrap steel are proportioned according to the above-mentioned weight percentage of components, melted, and slag is blocked to obtain a molten steel; S2, the molten steel is refined, continuous casting, slow cooling, and a casting blank is obtained; S3, the casting blank is heated, rough rolling, finish rolling, water pressure descaling of 12MPa is used, and controlled cooling after rolling to obtain a steel plate; wherein, the rough rolling temperature is 900℃, the finish rolling temperature is 550℃, and the total reduction rate is controlled to be 40%; the finish rolling temperature is 800℃, the finish rolling temperature is 400℃, and the total reduction rate is controlled to be 45%; S4, the steel plate is subjected to first heat treatment, heated to 900℃ at a heating rate of 50℃ / min, treated at 900℃ for 60min, cooled to 150℃ at a cooling rate of 50℃ / min; subjected to second heat treatment, heated to 750℃ at a heating rate of 50℃ / min, treated at 750℃ for 50min, cooled to room temperature at a cooling rate of 50℃ / min; subjected to third heat treatment, heated to 400℃ at a heating rate of 20℃ / min, treated at 400℃ for 60min, cooled to room temperature at a cooling rate of 50℃ / min; subjected to fourth heat treatment, heated to 525℃ at a heating rate of 20℃ / min, treated at 525℃ for 3h, cooled to room temperature at a cooling rate of 50℃ / min, to obtain the steel for chain plate.

[0025] Example 2 A corrosion-resistant steel for chain plate, consisting of the following components by weight percentage: 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%, the balance being iron and inevitable impurities thereof; A preparation method thereof, comprising the following steps: S1, the manganese iron alloy, iron cobalt alloy, aluminum iron alloy, vanadium iron powder, titanium iron alloy, copper iron alloy, magnesium ingot, terbium cobalt alloy, tungsten iron alloy, molybdenum iron alloy, magnesium antimony alloy and scrap steel are proportioned according to the above-mentioned weight percentage of components, melted, and slagged to obtain a molten steel; S2, the molten steel is refined, continuously cast, and slowly cooled to obtain a cast blank; S3, the cast blank is heated, rough rolled, finish rolled, descaled by water pressure of 15MPa, and controlled cooled after rolling to obtain a steel plate; wherein, the rough rolling temperature is 950℃, the finish rolling temperature is 650℃, and the total reduction rate is controlled to be 45%; the rough rolling temperature is 870℃, the finish rolling temperature is 450℃, and the total reduction rate is controlled to be 50%; S4, the steel plate is subjected to first heat treatment, heated to 1000℃ at a heating rate of 55℃ / min, treated at 1000℃ for 50min, cooled to 150℃ at a cooling rate of 50℃ / min; subjected to second heat treatment, heated to 800℃ at a heating rate of 55℃ / min, treated at 800℃ for 40min, cooled to room temperature at a cooling rate of 50℃ / min; subjected to third heat treatment, heated to 470℃ at a heating rate of 25℃ / min, treated at 470℃ for 50min, cooled to room temperature at a cooling rate of 50℃ / min; subjected to fourth heat treatment, heated to 575℃ at a heating rate of 25℃ / min, treated at 575℃ for 2.5h, cooled to room temperature at a cooling rate of 50℃ / min, to obtain the steel for chain plate.

[0026] Example 3 A corrosion-resistant steel for chain plate, consisting of the following components by weight percentage: 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%, the rest being iron and inevitable impurities thereof; A preparation method thereof, comprising the following steps: S1, the manganese iron alloy, iron cobalt alloy, aluminum iron alloy, vanadium iron powder, titanium iron alloy, copper iron alloy, magnesium ingot, terbium cobalt alloy, tungsten iron alloy, molybdenum iron alloy, magnesium antimony alloy and scrap steel are proportioned according to the above-mentioned components by weight percentage, melted, and slagged to obtain a molten steel; S2, the molten steel is refined, continuously cast, and slowly cooled to obtain a cast blank; S3, the cast blank is heated, rough rolled, finish rolled, descaled by water pressure of 18MPa, and controlled cooled after rolling to obtain a steel plate; wherein, the rough rolling temperature is 1000℃, the finish rolling temperature is 750℃, and the total reduction rate is controlled to be 50%; the rough rolling temperature is 950℃, the finish rolling temperature is 500℃; the total reduction rate is controlled to be 55% during rough rolling and finish rolling; S4, the steel plate is subjected to first heat treatment, heated to 1100℃ at a heating rate of 60℃ / min, treated at 1100℃ for 40min, and cooled to 150℃ at a cooling rate of 50℃ / min; subjected to second heat treatment, heated to 850℃ at a heating rate of 60℃ / min, treated at 850℃ for 30min, and cooled to room temperature at a cooling rate of 50℃ / min; subjected to third heat treatment, heated to 540℃ at a heating rate of 30℃ / min, treated at 540℃ for 40min, and cooled to room temperature at a cooling rate of 50℃ / min; subjected to fourth heat treatment, heated to 625℃ at a heating rate of 30℃ / min, treated at 625℃ for 2h, and cooled to room temperature at a cooling rate of 50℃ / min, to obtain the steel plate.

[0027] Example 4 The difference between this example and Example 2 is that in this example, 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%.

[0028] Example 5 The difference between this example and Example 2 is that in this example, 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%.

[0029] Example 6 The difference between this example and Example 2 is that in this example, 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%.

[0030] Example 7 The difference between this example and Example 6 is that in this example, the cooling rate of the first heat treatment and the second heat treatment is 90℃ / min, and the cooling rate of the third heat treatment and the fourth heat treatment is 5℃ / min.

[0031] Example 8 The difference between this example and Example 6 is that in this example, the cooling rate of the first heat treatment and the second heat treatment is 50℃ / min, and the cooling rate of the third heat treatment and the fourth heat treatment is 5℃ / min.

[0032] Example 9 The difference between this example and Example 6 is that in this example, the cooling rate of the first heat treatment and the second heat treatment is 90℃ / min, and the cooling rate of the third heat treatment and the fourth heat treatment is 50℃ / min.

[0033] Example 10 The difference between the present example and Example 6 is that, in the present example, the cooling rate of the first heat treatment and the second heat treatment is 70℃ / min, and the cooling rate of the third heat treatment and the fourth heat treatment is 12℃ / min.

[0034] Example 11 The difference between the present example and Example 6 is that, in the present example, the cooling rate of the first heat treatment and the second heat treatment is 80℃ / min, and the cooling rate of the third heat treatment and the fourth heat treatment is 30℃ / min.

[0035] Example 12 The difference between the present example and Example 11 is that, in the present example, the cooling rate of the fourth heat treatment is 15℃ / min.

[0036] Example 13 The difference between the present example and Example 11 is that, in the present example, the cooling rate of the third heat treatment is 15℃ / min.

[0037] Comparative Example 1 The difference between the present comparative example and Example 1 is that, in the present comparative example, Sb is not added, the weight percentage of W added is 0.055%, and the weight percentage of Cu added is 0.07%.

[0038] Comparative Example 2 The difference between the present comparative example and Example 1 is that, in the present comparative example, W is not added, the weight percentage of Sb added is 0.055%, and the weight percentage of Cu added is 0.07%.

[0039] Comparative Example 3 The difference between the present comparative example and Example 1 is that, in the present comparative example, Cu is not added, the weight percentage of Sb added is 0.03125%, and the weight percentage of W added is 0.9375%.

[0040] Comparative Example 4 The difference between the present comparative example and Example 1 is that, in the present comparative example, Sb and W are not added, and the weight percentage of Cu added is 0.125%.

[0041] Comparative Example 5 The difference between the present comparative example and Example 1 is that, in the present comparative example, Cu, Sb and W are not added.

[0042] Experimental Example 1: Corrosion Resistance Test 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% by mass of sodium chloride for 360h, and the salt spray corrosion rate of the chain plate steels was tested. The test results are shown in Table 1 below. Table 1 Corrosion resistance test results of Examples 1 to 6 and Comparative Examples 1 to 5

[0043] As can be seen from Table 1, compared with Comparative Examples 1 to 5, the salt spray corrosion rate of Example 1 is reduced to 0.43 g‧m -2 ‧h -1 , indicating that the addition of Cu, Sb and W improves the corrosion resistance of chain plate steel.

[0044] 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 weight of Cu, Sb and W satisfies 0.5≤(2Sb+W) / Cu≤1, the resistance to chloride ion corrosion can be further improved, and the corrosion resistance of the chain plate steel can be further improved.

[0045] Experimental Example 2 Yield Strength Test The chain plate steel prepared in Examples 6 to 13 was tested for yield strength according to the test method in GB / T 228.1-2021 "Tensile testing of metallic materials - Part 1: Room temperature test methods" at a test speed of 0.002s. -1 The test results are the average values ​​of 5 samples. The test results are shown in Table 2 below: Table 2 Yield strength test results of Examples 6 to 13

[0046] As can be seen from Table 2, compared with Examples 6 to 9, the yield strength of Examples 10 to 11 is improved, indicating that when the cooling rates of the first and second heat treatments are each independently 70 to 80°C / min, and the cooling rates of the third and fourth heat treatments are each independently 12 to 30°C / min, the yield strength of the chain plate steel can be improved.

[0047] Compared with Examples 11 to 12, the yield strength of Example 13 is improved, indicating that when the cooling rate of the third stage heat treatment is less than the cooling rate of the fourth stage heat treatment, the yield strength of the chain plate steel can be further improved.

[0048] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A corrosion-resistant steel for chain plates, characterized in that: It is composed of the following components in percentage by weight: 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 are iron and its inevitable impurities.

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

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

1.

4. The method for preparing corrosion-resistant chain plate steel according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1, according to the weight percentage of the components of the material, smelting, slag blocking, to obtain molten steel; S2, refining the molten steel, continuously casting, and slowly cooling to obtain a cast billet; S3, heating the ingot, performing rough rolling, finish rolling, descaling, and controlled cooling after rolling to obtain a steel plate; S4. Heat-treating the steel plate to obtain chain plate steel.

5. The method for preparing corrosion-resistant chain plate steel according to claim 4, characterized in that: The heat treatment is divided into a first stage heat treatment, a second stage heat treatment, a third stage heat treatment and a fourth stage heat treatment; During the first heat treatment, the temperature is 900~1100℃, the treatment time is 40~60min, and the cooling rate is 70~80℃ / min to 150℃; During the second heat treatment, the temperature is 750-850°C, the treatment time is 30-50 minutes, and the cooling rate is 70-80°C / min to room temperature; During the third heat treatment, the temperature is 400-540°C, the treatment time is 40-60 minutes, and the cooling rate is 12-30°C / min to room temperature; During the fourth heat treatment, the temperature is 525-625° C., the treatment time is 2-3 hours, and the material is cooled to room temperature at a cooling rate of 12-30° C. / min.

6. The method for preparing corrosion-resistant chain plate steel according to claim 5, characterized in that: The cooling rate of the third stage heat treatment is lower than the cooling rate of the fourth stage heat treatment.

7. The method for preparing corrosion-resistant chain plate steel according to claim 5, characterized in that: During the first heat treatment and the second heat treatment, the heating rates are independently 50-60°C / min; During the third heat treatment and the fourth heat treatment, the heating rates are independently 20-30° C. / min.

8. The method for preparing corrosion-resistant chain plate steel according to claim 4, characterized in that: In step S3, during the rough rolling, the starting rolling temperature is 900-1000°C, the finishing rolling temperature is 550-750°C, and the total reduction rate is 40%-50%; During the finish rolling, the starting rolling temperature is 800-950° C., the final rolling temperature is 400-500° C., and the total reduction rate is 45%-55%.

9. The method for preparing corrosion-resistant chain plate steel according to claim 4, characterized in that: In step S3, the descaling is performed using a water pressure of 12-18 MPa.

10. Application of the chain plate steel prepared by the method for preparing the corrosion-resistant chain plate steel according to any one of claims 1 to 3 or the corrosion-resistant chain plate steel according to any one of claims 4 to 9 in chain plates.

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