A production method of a 700mpa-grade high-strength container steel plate with an extremely thin gauge

Abstract

The present application relates to the technical field of container steel plate, in particular to a production method of an extremely thin 700MPa high-strength container steel plate. 1) Heating: the slab heating tapping temperature is controlled to be 1260-1280 DEG C, the hot material slab is controlled to be in the furnace for 180-200 min, the inter-furnace temperature difference of the slab is controlled to be within 20 DEG C, and the head-tail temperature difference of the slab is controlled to be within 20 DEG C; 2) Rough rolling: the R1 rough rolling machine and the R2 rough rolling machine only add dephosphorizing water in the last pass, and the temperature is controlled to be 1100-1130 DEG C; 3) Finish rolling: the F2 and F3 finish rolling machines are controlled to have a guide ruler surplus of 10-20 mm, the F4 and F5 finish rolling machines are controlled to have a guide ruler surplus of 10-30 mm, and the F6 and F7 finish rolling machines are controlled to have a guide ruler surplus of 10-30 mm; the finish rolling final rolling temperature is controlled to be 930-960 DEG C; 4) Laminar cooling: the head is controlled by high-temperature process, the coiling temperature of the head 50-100 m is 700-730 DEG C, the cooling speed is 50-80 DEG C / s; 5) Coiling: the coiling machine guide ruler short stroke amount is controlled to be 50-100 mm. The extremely thin 700MPa high-strength container steel plate with a thickness of 2.0 mm or less can be successfully produced.

Description

Technical Field

[0001] This invention relates to the field of container steel plate technology, specifically to a method for producing ultra-thin 700MPa grade high-strength container steel plates. Background Technology

[0002] A container is a modular tool that can carry packaged or unpackaged goods for transport and is easy to load and unload using mechanical equipment. The standardization of containers and the resulting transportation system enables the standardization of a massive object weighing tens of tons, and on this basis, a global logistics system integrating ships, ports, shipping routes, highways, transit stations, bridges, tunnels, and multimodal transport is gradually being realized.

[0003] With the development of the global economy and the growth of international trade, the shipping industry has maintained a rapid growth trend. The demand for container manufacturing is constantly increasing, and container steel plates are developing towards higher strength and lighter weight. The demand for special containers is gradually increasing, requiring the use of high-strength steel plates with a yield strength of 700MPa. The development of high-strength container steel will directly promote the development of containerized combined water and land transportation and the lightweighting of containers and their transport vehicles, thereby improving transport efficiency.

[0004] However, the current production process of ultra-thin 700MPa grade high-strength container steel plates with a thickness of less than 2.0mm faces the following intractable technical challenges: 1) High load, making it easy for the finishing mill current to exceed the limit and shut down; 2) Extremely thin strip with high alloy content, making it difficult to control the strip shape and prone to deviation; 3) Large temperature fluctuations, making it difficult to guarantee thickness and width; 4) Extremely thin strip, with the head running on the laminar flow roller conveyor posing a risk of slippage, affecting normal coiling and biting. Consequently, it is impossible to successfully produce ultra-thin 700MPa grade high-strength container steel plates with a thickness of less than 2.0mm. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention provides a method for producing ultra-thin 700MPa grade high-strength container steel plates, which can successfully produce ultra-thin 700MPa grade high-strength container steel plates with a thickness of less than 2.0mm.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A method for producing ultra-thin 700MPa grade high-strength container steel plates, wherein the steel plate thickness is ≤2mm and the yield strength is above 700MPa.

[0008] The steel plate is composed of the following chemical composition by weight percentage:

[0009] C: 0.06%–0.10%, Si: 0.05%–0.25%, Mn: 1.45%–1.90%, Als: 0.010%–0.055%, Nb: 0.030%–0.075%, Ti: 0.08%–0.15%, P≤0.050%, S≤0.050%, balance being Fe and unavoidable impurities.

[0010] The production method specifically includes the following steps:

[0011] 1) Heating:

[0012] The slab heating and tapping temperature is controlled at 1260-1280℃, the hot slab time in the furnace is controlled at 180-200 min, the second heating section is controlled at 70-90 min, the soaking section is controlled at 70-90 min, the temperature difference between slabs in the furnace is controlled within 20℃, and the temperature difference between the head and tail of the slab is controlled within 20℃.

[0013] 2) Rough rolling:

[0014] Dephosphorization water is added only in the last pass of the R1 roughing mill and the R2 roughing mill, and the temperature is controlled at 1100-1130℃.

[0015] 3) Finish rolling:

[0016] The guide length allowance for F2 and F3 finishing mills is controlled at 10-20mm, the guide length allowance for F4 and F5 finishing mills is controlled at 10-30mm, and the guide length allowance for F6 and F7 finishing mills is controlled at 10-30mm.

[0017] The finishing rolling temperature is controlled at 930–960℃;

[0018] 4) Laminar flow cooling:

[0019] The head section is manufactured using a high-temperature process, with a winding temperature of 700–730℃ for 50–100 meters; the cooling rate is 50–80℃ / s.

[0020] 5) Winding:

[0021] The short stroke of the winding machine guide ruler should be controlled between 50 and 100 mm.

[0022] Furthermore, in step 1), the time of the cold slab in the furnace is controlled at 185-205 min, the time of the second heating section is controlled at 75-95 min, and the time of the soaking section is controlled at 75-95 min.

[0023] Furthermore, in step 1), the camber trend of the slabs from different heating furnaces is controlled to be consistent.

[0024] Furthermore, in step 2), the camber of the intermediate billet is controlled within 15mm.

[0025] Furthermore, in step 3), 500mm ≤ flying shear head length ≤ 700mm.

[0026] Furthermore, in step 3), phosphorus is removed from the finishing mill.

[0027] Furthermore, in step 3), the cooling water in the finishing mill stand that is in contact with the strip is turned off.

[0028] Furthermore, in step 3), the convexity is ≤50μm.

[0029] Furthermore, in step 3), the absolute value of the wedge is ≤30μm.

[0030] Compared with existing methods, the beneficial effects of the present invention are:

[0031] This invention employs a high-temperature and uniform steel-firing process, with a heating temperature not lower than 1260℃ and a furnace time not lower than 180 minutes, effectively solving the problem of high load during the production of ultra-thin high-strength steel. By limiting the guide length allowance, the mill's centering capability is improved. Specifically, the guide length allowance for F2 and F3 finishing mills is controlled at 10–20 mm, for F4 and F5 finishing mills at 10–30 mm, and for F6 and F7 finishing mills at 10–30 mm, thus controlling strip deviation and improving production rolling efficiency. The stability of the strip is ensured by controlling the process temperature and combining it with the alloy precipitation strengthening mechanism. The RT2 temperature is reasonably controlled within the range of 1100-1130℃, and the final rolling temperature is controlled within the range of 930-960℃. This effectively avoids the precipitation of Nb (C, N) and other precipitates during the rolling process, achieving good control of width and thickness. High-temperature process control reduces the amount of laminar cooling water at the strip head, reduces strip running resistance, and effectively solves the problem of strip stacking on the laminar flow roller table, allowing the coiler to bite in normally. This invention can successfully produce ultra-thin 700MPa grade high-strength container steel plates with a thickness of less than 2.0mm. Detailed Implementation

[0032] This invention discloses a method for producing ultra-thin 700MPa high-strength container steel plates. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired result. It should be particularly noted that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments, and those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention.

[0033] A method for producing ultra-thin 700MPa grade high-strength container steel plates, wherein the steel plate thickness is ≤2mm and the yield strength is above 700MPa.

[0034] The steel plate is composed of the following chemical composition by weight percentage:

[0035] C: 0.06%–0.10%, Si: 0.05%–0.25%, Mn: 1.45%–1.90%, Als: 0.010%–0.055%, Nb: 0.030%–0.075%, Ti: 0.08%–0.15%, P≤0.050%, S≤0.050%, balance being Fe and unavoidable impurities.

[0036] The production method specifically includes the following steps:

[0037] 1. Heating process

[0038] (1) Considering that the 700MPa grade high-strength container steel has a high alloy content and high material strength, the slab heating and tapping temperature should be strictly controlled within the range of 1260~1280℃.

[0039] (2) To ensure uniform steelmaking, the hot slab should be in the furnace for 180 to 200 minutes, and the time in the second heating section and the soaking section should be 70 to 90 minutes; the time in the cold slab should be extended by 5 minutes based on the above requirements.

[0040] (3) Considering the difficulty of rolling 700MPa grade high-strength container steel with a thickness of less than 2.0mm, the slab heating process in different heating furnaces should be consistent:

[0041] A. The temperature difference between furnaces and the temperature difference between the beginning and end of the furnace should be controlled within 20℃.

[0042] B. The camber trend of slabs from different heating furnaces should be controlled consistently.

[0043] 2. Rough rolling process

[0044] (1) To ensure the final rolling temperature and reduce the temperature drop of the intermediate billet:

[0045] A. The intermediate billet in the rough rolling mill is not allowed to be swung or oscillated.

[0046] B, R1, and R2 are only added to the final descaling water.

[0047] (2) To ensure the final rolling temperature, the final rolling temperature RT2 of the roughing mill is controlled at 1100~1130℃.

[0048] (3) To ensure the stability of the head threading and tail steel throwing process of the finishing mill, the camber of the intermediate billet is controlled within 15mm.

[0049] 3. Finishing rolling process

[0050] (1) To ensure the stability of steel threading and steel pouring for high-strength containers with a diameter of less than 2.0mm:

[0051] A. 500mm ≤ flying shear head length ≤ 700mm.

[0052] B. Roller requirements: Rollers should be matched according to the target elevation close to zero to ensure the stability of the strip threading process.

[0053] C. Control the guide length allowance of the finishing mill to reduce the tendency of the strip to deviate.

[0054] The guide length allowance for finishing mills F2 and F3 is controlled at 10-20mm, for finishing mills F4 and F5 at 10-30mm, and for finishing mills F6 and F7 at 10-30mm.

[0055] (2) The 700MPa grade high-strength container steel has a high alloy content and a large rolling mill load. In particular, the alloying element Nb is a precipitation strengthening element, and its precipitation temperature range is within the control range of finishing rolling. High-strength containers with a thickness of less than 2.0mm are prone to problems such as strip deviation and steel piling. Therefore, the cooling water and temperature in the rolling process must be controlled.

[0056] A. Descaling water input status: Fine milling single descaling.

[0057] B. The FDT temperature should be controlled within the range of 930 to 960℃.

[0058] C. Turn off the cooling water in the finishing mill stand that is in contact with the strip.

[0059] (3) For high-strength containers with a thickness of less than 2.0mm, the finished product is thin and the plate shape is difficult to control. The convexity is controlled within the range of ≤50μm, the absolute value of the wedge is ≤30μm, and the plate shape of the finished product is controlled according to the micro-wave pattern.

[0060] 4. Laminar flow cooling

[0061] Because the strip steel is relatively thin, it is easy for it to accumulate on the laminar flow roller conveyor.

[0062] A. The head is controlled by a high-temperature process, and the head temperature is controlled within the range of 50-100 meters from the target value + 50-80℃.

[0063] B. The cooling method adopted is the Great Wall cooling system.

[0064] 5. Winding process

[0065] To ensure that ultra-thin 700MPa high-strength container strips can be properly bitten into the coiler, the short stroke of the coiler guide ruler is controlled within the range of 50-100mm.

[0066] Example 1:

[0067] A method for producing an ultra-thin 700MPa grade high-strength container steel plate, wherein the steel plate is composed of the following chemical composition by weight percentage: C: 0.06%, Si: 0.05%, Mn: 1.45%, Als: 0.010%, Nb: 0.030%, Ti: 0.08%, P: 0.030%, S: 0.0150%, with the balance being Fe and unavoidable impurities.

[0068] The production method specifically includes the following steps:

[0069] 1. Planning

[0070] (1) The plan is to control the roll changing when all 700MPA grade high-strength container slabs enter the heating furnace.

[0071] (2) The plan is to start compiling the high-strength container steel plan from the 25th roll after the roll change.

[0072] (3) The plan is to compile no more than 20 2.0mm thick standard blocks in a single cycle.

[0073] 2. Heating process

[0074] (1) Control the slab heating and tapping temperature according to the target value of 1260℃.

[0075] (2) The hot slab should be in the furnace for 180 minutes, and the time in the second heating section and the soaking section should be 80 minutes; the time in the cold slab should be extended by 5 minutes based on the above requirements.

[0076] (3) The slabs must be fired in the same way in different heating furnaces:

[0077] A. The temperature difference between furnaces and the temperature difference between the beginning and end of the furnace should be controlled within 15℃.

[0078] B. The camber trend of slabs from different heating furnaces should be controlled consistently.

[0079] 3. Rough rolling process

[0080] (1) To ensure the final rolling temperature and reduce the temperature drop of the intermediate billet:

[0081] A. The intermediate billet in the rough rolling mill is not allowed to be swung or oscillated.

[0082] B, R1, and R2 are only added to the final descaling water.

[0083] (2) To ensure the final rolling temperature, the final rolling temperature RT2 of the roughing mill is controlled according to the target value of 1110℃.

[0084] (3) To ensure the stability of the head threading and tail steel throwing process of the finishing mill, the camber of the intermediate billet is controlled within 15mm.

[0085] 4. Finishing rolling process

[0086] (1) To ensure the stability of steel threading and steel throwing for 2.0mm high-strength containers:

[0087] A. Set the length of the flying shear head to 500mm.

[0088] B. Roller requirements: Rollers should be matched according to the target elevation close to zero to ensure the stability of the strip threading process.

[0089] C. Control the guide length allowance of the finishing mill to reduce the tendency of the strip to deviate.

[0090] The margin of guide rulers F2 and F3 on the frame is controlled at 10mm, F4 at 15mm, F5 at 20mm, F6 at 30mm, and F7 at 30mm.

[0091] (2) Control the cooling water and temperature during the rolling process:

[0092] A. Descaling water input status: Fine milling single descaling.

[0093] B. The finishing rolling temperature (FDT) is controlled according to the target value of 940℃.

[0094] C. Turn off the cooling water in the finishing mill stand that is in contact with the strip.

[0095] (3) 2.0mm specification high strength container plate shape control requirements: the convexity is controlled according to the target value of 45μm, the wedge absolute value is controlled to be ≤30μm, and the fine rolling exit plate shape is controlled according to the target value of 10I.

[0096] 5. Laminar flow cooling

[0097] Because the strip steel is relatively thin, it is easy for it to accumulate on the laminar flow roller conveyor.

[0098] A. The head is controlled by a high-temperature process, and the head temperature is set at 50°C above the target value for 50 meters.

[0099] B. The cooling method adopted is the Great Wall cooling system.

[0100] 6. Winding process

[0101] To ensure that ultra-thin 700MPa high-strength container strip can be properly bitten into the coiler, the short stroke of the coiler guide ruler is controlled at 80mm.

[0102] In this embodiment, the steel plate has a thickness of 2mm, a yield strength of 700MPa, a tensile strength of 820MPa, and an elongation of 20%. The steel plate of this invention has excellent comprehensive performance, possessing high strength, high and low temperature toughness, high strain resistance, high crack arrest capability, and good weldability, meeting the requirements of high-strength containers.

[0103] Example 2:

[0104] A method for producing an ultra-thin 700MPa grade high-strength container steel plate, wherein the steel plate is composed of the following chemical composition by weight percentage: C: 0.07%, Si: 0.06%, Mn: 1.6%, Als: 0.015%, Nb: 0.040%, Ti: 0.10%, P: 0.020%, S: 0.0120%, with the balance being Fe and unavoidable impurities.

[0105] The production method specifically includes the following steps:

[0106] 1. Planning

[0107] (1) The plan is to control the roll changing when all 700MPA grade high-strength container slabs enter the heating furnace.

[0108] (2) The plan is to start compiling the high-strength container steel plan from the 25th roll after the roll change.

[0109] (3) The plan is to compile no more than 20 2.0mm thick standard blocks in a single cycle.

[0110] 2. Heating process

[0111] (1) Control the slab heating and tapping temperature according to the target value of 1270℃.

[0112] (2) The hot slab should be in the furnace for 190 minutes, and the time in the second heating section and the soaking section should be 85 minutes; the time in the cold slab should be extended by 5 minutes based on the above requirements.

[0113] (3) The slabs must be fired in the same way in different heating furnaces:

[0114] A. The temperature difference between furnaces and the temperature difference between the beginning and end of the furnace should be controlled within 15℃.

[0115] B. The camber trend of slabs from different heating furnaces should be controlled consistently.

[0116] 3. Rough rolling process

[0117] (1) To ensure the final rolling temperature and reduce the temperature drop of the intermediate billet:

[0118] A. The intermediate billet in the rough rolling mill is not allowed to be swung or oscillated.

[0119] B, R1, and R2 are only added to the final descaling water.

[0120] (2) To ensure the final rolling temperature, the final rolling temperature RT2 of the roughing mill is controlled according to the target value of 1115℃.

[0121] (3) To ensure the stability of the head threading and tail steel throwing process of the finishing mill, the camber of the intermediate billet is controlled within 15mm.

[0122] 4. Finishing rolling process

[0123] (1) To ensure the stability of steel threading and steel pouring for 1.8mm high-strength containers:

[0124] A. Set the length of the flying shear head to 600mm.

[0125] B. Roller requirements: Rollers should be matched according to the target elevation close to zero to ensure the stability of the strip threading process.

[0126] C. Control the guide length allowance of the finishing mill to reduce the tendency of the strip to deviate.

[0127] The margin of guide rulers F2 and F3 on the frame is controlled at 8mm, the margin of guide ruler F4 is controlled at 12mm, the margin of guide ruler F5 is controlled at 15mm, the margin of guide ruler F6 is controlled at 25mm, and the margin of guide ruler F7 is controlled at 25mm.

[0128] (2) Control the cooling water and temperature during the rolling process:

[0129] A. Descaling water input status: Fine milling single descaling.

[0130] B. The finishing rolling temperature (FDT) is controlled according to the target value of 945℃.

[0131] C. Turn off the cooling water in the finishing mill stand that is in contact with the strip.

[0132] (3) 2.0mm specification high strength container plate shape control requirements: the convexity is controlled according to the target value of 40μm, the wedge absolute value is controlled to be ≤25μm, and the fine rolling exit plate shape is controlled according to the target value of 9I.

[0133] 5. Laminar flow cooling

[0134] Because the strip steel is relatively thin, it is easy for it to accumulate on the laminar flow roller conveyor.

[0135] A. The head is controlled by a high-temperature process, and the head is controlled at 65 degrees Celsius above the target value.

[0136] B. The cooling method adopted is the Great Wall cooling system.

[0137] 6. Winding process

[0138] To ensure that ultra-thin 700MPa high-strength container strip can be properly bitten into the coiler, the short stroke of the coiler guide ruler is controlled at 80mm.

[0139] In this embodiment, the steel plate has a thickness of 2mm, a yield strength of 760MPa, a tensile strength of 850MPa, and an elongation of 21%. The steel plate of this invention has excellent comprehensive performance, possessing high strength, high and low temperature toughness, high strain resistance, high crack arrest capability, and good weldability, meeting the requirements of high-strength containers.

[0140] Example 3:

[0141] A method for producing an ultra-thin 700MPa grade high-strength container steel plate, wherein the steel plate is composed of the following chemical composition by weight percentage: C: 0.08%, Si: 0.08%, Mn: 1.70%, Als: 0.025%, Nb: 0.055%, Ti: 0.080%, P≤0.015%, S≤0.010%, with the balance being Fe and unavoidable impurities.

[0142] The production method specifically includes the following steps:

[0143] 1. Planning

[0144] (1) The plan is to control the roll changing when all 700MPA grade high-strength container slabs enter the heating furnace.

[0145] (2) The plan is to start compiling the high-strength container steel plan from the 25th roll after the roll change.

[0146] (3) The plan is to compile no more than 20 2.0mm thick standard blocks in a single cycle.

[0147] 2. Heating process

[0148] (1) Control the slab heating and tapping temperature, and control it according to the target value of 1280℃.

[0149] (2) The hot slab should be in the furnace for 200 minutes, and the time in the second heating section and the soaking section should be 90 minutes; the time in the cold slab should be extended by 5 minutes based on the above requirements.

[0150] (3) The slabs must be fired in the same way in different heating furnaces:

[0151] A. The temperature difference between furnaces and the temperature difference between the beginning and end of the furnace should be controlled within 15℃.

[0152] B. The camber trend of slabs from different heating furnaces should be controlled consistently.

[0153] 3. Rough rolling process

[0154] (1) To ensure the final rolling temperature and reduce the temperature drop of the intermediate billet:

[0155] A. The intermediate billet in the rough rolling mill is not allowed to be swung or oscillated.

[0156] B, R1, and R2 are only added to the final descaling water.

[0157] (2) To ensure the final rolling temperature, the final rolling temperature RT2 of the roughing mill is controlled according to the target value of 1125℃.

[0158] (3) To ensure the stability of the head threading and tail steel throwing process of the finishing mill, the camber of the intermediate billet is controlled within 15mm.

[0159] 4. Finishing rolling process

[0160] (1) To ensure the stability of steel threading and steel throwing for 2.0mm high-strength containers:

[0161] A. Set the length of the flying shear head to 700mm.

[0162] B. Roller requirements: Rollers should be matched according to the target elevation close to zero to ensure the stability of the strip threading process.

[0163] C. Control the guide length allowance of the finishing mill to reduce the tendency of the strip to deviate.

[0164] The margin of guide rulers F2 and F3 on the frame is controlled at 5mm, F4 at 10mm, F5 at 15mm, F6 at 20mm, and F7 at 20mm.

[0165] (2) Control the cooling water and temperature during the rolling process:

[0166] A. Descaling water input status: Fine milling single descaling.

[0167] B. The finishing rolling temperature (FDT) is controlled according to the target value of 960℃.

[0168] C. Turn off the cooling water in the finishing mill stand that is in contact with the strip.

[0169] (3) 2.0mm specification high strength container plate shape control requirements: the convexity is controlled according to the target value of 35μm, the wedge absolute value is controlled to be ≤20μm, and the fine rolling exit plate shape is controlled according to the target value of 6I.

[0170] 5. Laminar flow cooling

[0171] Because the strip steel is relatively thin, it is easy for it to accumulate on the laminar flow roller conveyor.

[0172] A. The head is controlled by a high-temperature process, and the head is controlled at 80°C above the target value.

[0173] B. The cooling method adopted is the Great Wall cooling system.

[0174] 6. Winding process

[0175] To ensure that ultra-thin 700MPa high-strength container strip can be properly bitten into the coiler, the short stroke of the coiler guide ruler is controlled at 80mm.

[0176] In this embodiment, the steel plate has a thickness of 2mm, a yield strength of 780MPa, a tensile strength of 890MPa, and an elongation of 23%. The steel plate of this invention has excellent comprehensive performance, possessing high strength, high and low temperature toughness, high strain resistance, high crack arrest capability, and good weldability, meeting the requirements of high-strength containers.

[0177] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for producing ultra-thin 700MPa grade high-strength container steel plates, characterized in that, The steel plate has a thickness of ≤2mm and a yield strength of ≥700MPa. The production method specifically includes the following steps: 1) Heating: The slab heating and tapping temperature is controlled at 1260–1280℃, the hot slab time in the furnace is controlled at 180–200 min, the second heating section of the hot slab is controlled at 70–90 min, the soaking section of the hot slab is controlled at 70–90 min, the temperature difference between slabs in different furnaces is controlled within 20℃, and the temperature difference between the head and tail of the slab is controlled within 20℃; the camber trend of slabs in different heating furnaces is kept consistent. 2) Rough rolling: R1 and R2 roughing mills only add dephosphorization water in the last pass, and the final rolling temperature of roughing mill is controlled at 1100-1130℃; the sickle bend of intermediate billets is controlled within 15mm. 3) Finish rolling: The guide length allowance for F2 and F3 finishing mills is controlled at 10~20mm, the guide length allowance for F4 and F5 finishing mills is controlled at 10~30mm, and the guide length allowance for F6 and F7 finishing mills is controlled at 10~30mm. The finishing rolling temperature is controlled at 930–960℃; Convexity ≤ 50μm; wedge absolute value ≤ 30 μm; 4) Laminar flow cooling: The head section is manufactured using a high-temperature process, with a winding temperature of 700-730℃ for the first 50-100 meters. Cooling rate: 50–80°C / s; 5) Winding: The short stroke of the winding machine guide ruler should be controlled between 50 and 100 mm.

2. The method for producing an ultra-thin 700MPa grade high-strength container steel plate according to claim 1, characterized in that, In step 1), the time of the cold slab in the furnace is controlled at 185-205 min, the second heating section of the cold slab is controlled at 75-95 min, and the soaking section of the cold slab is controlled at 75-95 min.

3. The method for producing an ultra-thin 700MPa grade high-strength container steel plate according to claim 1, characterized in that, In step 3), the length of the flying shear head is 500mm ≤ 700mm.

4. The method for producing an ultra-thin 700MPa grade high-strength container steel plate according to claim 1, characterized in that, In step 3), phosphorus is removed from the finishing mill.

5. The method for producing an ultra-thin 700MPa grade high-strength container steel plate according to claim 1, characterized in that, In step 3), the cooling water in the finishing mill stand that is in contact with the strip is turned off.

6. The method for producing an ultra-thin 700MPa grade high-strength container steel plate according to claim 1, characterized in that, The steel plate is composed of the following chemical composition by weight percentage: C: 0.06%~0.10%, Si: 0.05%~0.25%, Mn: 1.45%~1.90%, Als: 0.010%~0.055%, Nb: 0.030%~0.075%, Ti: 0.08%~0.15%, P≤0.050%, S≤0.050%, with the balance being Fe and unavoidable impurities.