CN104561781A - Q460 level shock resisting steel and method for producing Q460 level shock resisting steel by using steekle mill - Google Patents

Abstract

The invention relates to a Q460-grade anti-seismic steel and a method for producing the Q460-grade anti-seismic steel with a steel coil mill, belonging to the technical field of metal material processing and forming. The components of the Q460 anti-seismic steel are: C, Si, Mn, S, P, Nb, V, Ti, N, Als, and the rest are Fe and other impurities. Firstly, after the slab is heated and water sprayed to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact coil rolling mill, and the steel plate obtained from the finish rolling is sent to the coiler for coiling, and then naturally air-cooled To room temperature, the Q460 grade seismic steel plate with high strength and low yield ratio can be obtained. This Q460 anti-seismic steel has added micro-alloying elements such as Nb and V, which effectively improves the strength and toughness of the Q460 anti-seismic steel plate; potential, expanded the variety of strip products, and optimized the product structure.

Description

A kind of Q460 anti-seismic steel and the method for producing Q460 anti-seismic steel with a steel coil mill

technical field

The invention relates to a Q460-grade anti-seismic steel and a method for producing the Q460-grade anti-seismic steel with a steel coil mill, belonging to the technical field of metal material processing and forming.

Background technique

As a construction steel, the anti-seismic steel plate has the characteristics of high tensile strength, low yield ratio, excellent Z-direction performance, and good welding performance. With the development of high-rise buildings and the occurrence of geological disasters in recent years, the world and my country have paid attention to the development of seismic structural steel. The main anti-seismic steels used in the United States are ASTM A992 structural steel and ASTM A572 structural steel (additional yield ratio requirements). In recent years, Japan has developed a series of low yield ratio seismic structural steels, such as HT490 steel, HT590 steel and HT780 steel, etc., all of which have a narrow yield strength fluctuation range, and SN400 steel is specified in the JIS G3136-1994 special standard for structural steel And the yield strength ratio of SN490 steel is limited. my country's Anshan Iron and Steel Company, Wuhan Iron and Steel Group Corporation (Wuhan Iron and Steel Co., Ltd.), Baosteel Group Co., Ltd., and Wuyang Iron and Steel Co., Ltd. can all produce high-quality anti-seismic steel plates that meet foreign standards, such as SN490B steel, SN490B steel and A572 steel. . Yunnan is located in an earthquake-prone area, and destructive earthquakes occur almost every year, causing huge losses to people's lives and properties. must do. At present, the Q460 anti-seismic steel plate developed in my country mainly adopts the production process of medium and heavy plate, and all adopt hot continuous rolling technology. There is no report on the production of anti-seismic steel plate by using a single double-stand compact stove coil rolling mill. For this reason, Wuhan Iron and Steel Group Corporation ( Kunming Iron and Steel Co., Ltd.) double-stand compact steckel rolling mill, which continuously completes rough rolling, intermediate rolling and finish rolling, thereby developing high-strength, low-yield-ratio Q460-grade seismic steel plates, which has no precedent.

Contents of the invention

Aiming at the problems and deficiencies in the above-mentioned prior art, the present invention provides a Q460-grade anti-seismic steel and a method for producing Q460-grade anti-seismic steel with a steckel mill. This Q460 anti-seismic steel has added micro-alloying elements such as Nb and V, which effectively improves the strength and toughness of the Q460 anti-seismic steel plate; Potential, expanding the variety of strip products, optimizing the product structure, the present invention is realized through the following technical solutions.

A Q460-grade anti-seismic steel, the percentage composition of the Q460-grade anti-seismic steel is: C0.05~0.16wt%, Si0.25~0.40wt%, Mn1.20~1.70wt%, S≤0.030wt%, P≤ 0.030wt%, Nb0.035~0.090wt%, V0.05~0.15wt%, Ti0.05~0.10wt%, N≤0.015wt%, Als0.015~0.05wt%, the rest is Fe and other impurities.

A method for producing Q460-grade shock-resistant steel with a steel-steel rolling mill. Firstly, after heating the slab and spraying water to remove phosphorus, the rough rolling and finishing rolling are continuously completed on the same double-stand compact steel-steel rolling mill. The obtained steel plate is sent to a coiler for coiling, and then naturally air-cooled to room temperature to obtain a high-strength, low yield ratio Q460 seismic steel plate, wherein the percentage components of the slab are: C0.05~0.16wt%, Si0 .25~0.40wt%, Mn1.20~1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035~0.090wt%, V0.05~0.15wt%, Ti0.05~0.10wt% , N≤0.015wt%, Als0.015~0.05wt%, and the rest are Fe and other impurities.

The specific steps are as follows:

Step 1. First, heat the slab at a temperature of 1230-1270°C for 130-260 minutes, and control the time of the slab in the soaking section to 45-65 minutes;

Step 2, spray water scales on the front and back sides of the slab treated in step 1 for 11-16 seconds with high-pressure water with a pressure of 18-22 MPa;

Step 3. Send the descaled slab in step 2 to a double-stand compact steckel mill for rolling, and control the rolling start temperature to 1080-1170°C for 4-7 passes of continuous rough rolling. Cooling water between passes to obtain rough-rolled steel plates;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 25-50 seconds in the double-stand compact steckel mill, then make the rough-rolled steel plate temperature 860-890°C, perform 4 passes of continuous finish rolling, and Turn on the cooling water between passes, and control the final rolling temperature to 810~860°C to prepare a finished rolled steel plate;

Step 5, sending the finished rolled steel plate obtained in step 4 to a coiler for coiling, and controlling the coiling temperature to 570-630°C, and simultaneously controlling the laminar cooling rate to 11-16°C/s to obtain a steel coil;

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a high-strength, low-yield-ratio Q460-grade seismic steel plate.

In the step 4, the rough-rolled steel plate continues to be delayed for 25-50 seconds in the double-stand compact steckel rolling mill, and the rough-rolled steel plate is allowed to reciprocate on the ground roll for 25-50 seconds before finishing rolling, and the finish rolling is controlled. The total rolling deformation rate is greater than 48%, so that the slab after continuous rough rolling and large deformation undergoes relaxation and precipitation, and a rough rolled slab with uniform and fine austenite structure is obtained, which effectively prevents the occurrence of mixed crystals.

The number of passes and the rolling speed in the process of step 3 and step 4 are specifically determined according to different specification requirements.

The slab in the above step 1 is obtained by using the steelmaking method of the prior art, wherein Nb, V and other chemical elements are added and controlled during the steelmaking process.

The Q460 anti-seismic steel plate with a production thickness of 10-40 mm prepared by the present invention has the advantages of high strength, high plasticity, high toughness, yield strength ratio <0.8, excellent Z-direction performance, etc., and meets the current high-rise, super high-rise and long-span steel structures in my country. Building requirements for the seismic performance of steel.

The beneficial effects of the present invention are:

1. The use of the present invention to produce Q460-grade seismic steel plates has fully explored the potential of Kunming Steel's double-stand compact steckel mill, expanded the variety of plate and strip products, and optimized the product structure.

2. The delay rolling process is added in the rolling process, so that the microalloying elements such as Nb and V in the steel can fully play their roles, and obtain a fine and uniform structure, thereby preventing the appearance of mixed crystals and effectively improving the Q460 earthquake resistance. The strength and toughness of the steel plate.

3. Utilizing the composition and production process of the present invention, through the strict control of each link in the actual production process, the Q460 earthquake-resistant steel plate produced has the characteristics of high strength, low yield ratio, and good comprehensive performance. The performance indicators of the plates produced by welding the Q460-grade anti-seismic steel plates meet the national standards, and can fully meet the anti-seismic performance requirements of building steel structures.

4. Compared with other conventional products, the Q460 anti-seismic steel plate produced by this method has the characteristics of high technical content and high added value, and has remarkable economic benefits.

Detailed ways

The present invention will be further described below in combination with specific embodiments.

Example 1

The Q460 anti-seismic steel, the percentage components of the Q460 anti-seismic steel are: C0.08wt%, Si0.25wt%, Mn1.65wt%, S0.015wt%, P0.020wt%, Nb0.055wt%, V0.09wt% %, Ti0.07wt%, N0.010wt%, Als0.035wt%, and the rest are Fe and other impurities, which are unavoidable impurities.

The method for producing Q460 grade shock-resistant steel with this steckel mill: first, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate feeding and coiling machine is coiled, and then naturally air-cooled to room temperature to obtain a high-strength, low-yield ratio Q460 seismic steel plate, in which the percentage components of the slab are: C0.08wt%, Si0.25wt%, Mn1 .65wt%, S0.015wt%, P0.020wt%, Nb0.055wt%, V0.09wt%, Ti0.07wt%, N0.010wt%, Als0.035wt%, the rest is Fe and other impurities, impurities are unavoidable of impurities.

Specific steps are as follows:

Step 1. First, heat the slab at 1250°C for 180 minutes, and the time of the slab in the soaking section is controlled at 57 minutes, so as to ensure that the micro-alloys such as Nb and V precipitated in the slab are fully re-dissolved and refined. Tensitic grains and preparations for controlled cooling precipitation after rolling, so as to uniform the internal structure of the slab;

Step 2, the slab treated in step 1 is sprayed with water scales on the front and back sides of the slab with a pressure of 19 MPa for 13 seconds;

Step 3. Send the descaled slab in step 2 to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1120°C, conduct 4 passes of continuous rough rolling, and start cooling between passes at the same time water, and the rough rolling is carried out at a rolling speed of 2.6m/s to obtain a rough rolled steel plate;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 38 seconds in the double-stand compact steckel rolling mill, allow the rough-rolled steel plate to move back and forth on the ground roll for 38 seconds, and then carry out finish rolling, and control the finish rolling The total deformation rate is 56%, allowing the slab after continuous rough rolling to undergo relaxation and precipitation to obtain a rough-rolled slab with a uniform and fine austenite structure, which can effectively prevent the occurrence of mixed crystals, and then the temperature of the rough-rolled steel plate is 860 ℃, the rolling speed is controlled at 4.5m/s, 6 passes of continuous finish rolling are carried out, and the cooling water between passes is turned on, and the finish rolling temperature is controlled at 820°C to prepare a finish rolled steel plate;

Step 5. Send the finished steel plate obtained in step 4 to the coiler for coiling, and control the coiling temperature to 590°C, and simultaneously control the laminar cooling rate to 15°C/s to obtain a steel coil; the laminar cooling rate is 15°C/s s, is to control the precipitation strengthening and solid solution strengthening of the microalloy, and at the same time, by controlling the coiling temperature to achieve the purpose of controlling the transformation morphology, size, quantity and distribution state of pearlite, bainite, etc., so as to ensure that the product has sufficient strength and toughness.

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a Q460 grade earthquake-resistant steel plate with high strength, low yield ratio, and a thickness of 20 mm.

The mechanical properties of the Q460 seismic steel plate prepared in this example are shown in Table 1.

Table 1 Mechanical properties of Q460 grade seismic steel plate

Example 2

The Q460 anti-seismic steel, the percentage composition of the Q460 anti-seismic steel is: C0.10wt%, Si0.34wt%, Mn1.55wt%, S0.018wt%, P0.023wt%, Nb0.045wt%, V0.08wt% %, Ti0.09wt%, N0.008wt%, Als0.028wt%, the rest is Fe and unavoidable impurities.

The method for producing Q460 grade shock-resistant steel with this steckel mill: first, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate feeding and coiling machine is coiled, and then naturally air-cooled to room temperature to obtain a high-strength, low-yield ratio Q460 seismic steel plate. The percentage components of the slab are: C0.10wt%, Si0.34wt%, Mn1.55wt%, S0.018wt%, P0.023wt%, Nb0.045wt%, V0.08wt%, Ti0.09wt%, N0.008wt%, Als0.028wt%, the rest is Fe and unavoidable impurities .

Specific steps are as follows:

Step 1. First, heat the slab for 190 minutes at a temperature of 1260°C, and control the time of the slab in the soaking section to 59 minutes to ensure that the micro-alloys such as Nb and V precipitated in the slab are fully re-dissolved and refined. Tensitic grains and preparations for controlled cooling precipitation after rolling, so as to uniform the internal structure of the slab;

Step 2, the slab treated in step 1 is sprayed with water scales on the front and back sides of the slab with a pressure of 19 MPa for 14 seconds;

Step 3. Send the descaled slab in step 2 to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1140°C, conduct 4 passes of continuous rough rolling, and start cooling between passes at the same time water, and the rough rolling is carried out at a rolling speed of 2.3m/s to obtain a rough rolled steel plate;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 40 seconds in the double-stand compact steckel mill, allow the rough-rolled steel plate to move back and forth on the ground roll for 40 seconds, and then carry out finish rolling, and control the finish rolling The total deformation rate is 60%, allowing the slab after continuous rough rolling to undergo relaxation and precipitation to obtain a rough-rolled slab with a uniform and fine austenite structure, which can effectively prevent the occurrence of mixed crystals, and then the temperature of the rough-rolled steel plate is 870 ℃, the rolling speed is controlled at 4.2m/s, 5 passes of continuous finish rolling are carried out, and the cooling water between passes is turned on, and the finish rolling temperature is controlled at 850°C to prepare a finish rolled steel plate;

Step 5. Send the finished steel plate obtained in step 4 to the coiler for coiling, and control the coiling temperature to 620°C, and simultaneously control the laminar cooling rate to 15°C/s to obtain a steel coil; the laminar cooling rate is 15°C/s s, is to control the precipitation strengthening and solid solution strengthening of the microalloy, and at the same time, by controlling the coiling temperature to achieve the purpose of controlling the transformation morphology, size, quantity and distribution state of pearlite, bainite, etc., so as to ensure that the product has sufficient strength and toughness.

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a Q460 grade seismic steel plate with high strength, low yield ratio, and a thickness of 32 mm.

The mechanical properties of the Q460 seismic steel plate prepared in this example are shown in Table 2.

Table 2 Mechanical properties of Q460 seismic steel plate

Example 3

The Q460 anti-seismic steel, the percentage composition of the Q460 anti-seismic steel is: C0.14wt%, Si0.35wt%, Mn1.53wt%, S0.020wt%, P0.025wt%, Nb0.040wt%, V0.12wt% %, Ti0.08wt%, N0.009wt%, Als0.026wt%, the rest is Fe and unavoidable impurities.

The method for producing Q460 grade shock-resistant steel with this steckel mill: first, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate feeding and coiling machine is coiled, and then naturally air-cooled to room temperature to obtain high-strength, low-yield-ratio Q460-grade anti-seismic steel plates. The percentage components of the slab are: C0.14wt%, Si0.35wt%, Mn1.53wt%, S0.020wt%, P0.025wt%, Nb0.040wt%, V0.12wt%, Ti0.08wt%, N0.009wt%, Als0.026wt%, the rest is Fe and unavoidable impurities .

Specific steps are as follows:

Step 1. First, heat the slab for 220 minutes at a temperature of 1270°C, and control the time of the slab in the soaking section to 60 minutes, so as to ensure that the microalloys such as Nb and V precipitated in the slab are fully re-dissolved and refined. Tensitic grains and preparations for controlled cooling precipitation after rolling, so as to uniform the internal structure of the slab;

Step 2, the slab treated in step 1 is sprayed with water scales on the front and back sides of the slab with a pressure of 21 MPa for 15 seconds;

Step 3. Send the descaled slab in step 2 to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1170°C, conduct 6 passes of continuous rough rolling, and start cooling between passes at the same time water, and the rough rolling is carried out at a rolling speed of 2.5m/s to obtain a rough rolled steel plate;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 50 seconds in the double-stand compact steckel rolling mill, and allow the rough-rolled steel plate to move back and forth on the ground roller for 50 seconds before performing finish rolling, and control the finish rolling The total deformation rate is 65%, allowing the slab after continuous rough rolling to undergo relaxation and precipitation to obtain a rough-rolled slab with a uniform and fine austenite structure, which can effectively prevent the occurrence of mixed crystals, and then the temperature of the rough-rolled steel plate is 890 ℃, the rolling speed is controlled at 4.5m/s, 8 passes of continuous finish rolling are carried out, and the cooling water between passes is turned on, and the finish rolling temperature is controlled at 860°C to prepare a finish-rolled steel plate;

Step 5. Send the finished rolled steel plate obtained in step 4 to the coiler for coiling, and control the coiling temperature to 610°C, and simultaneously control the laminar cooling rate to 16°C/s to obtain a steel coil; the laminar cooling rate is 16°C/s s, is to control the precipitation strengthening and solid solution strengthening of the microalloy, and at the same time, by controlling the coiling temperature to achieve the purpose of controlling the transformation morphology, size, quantity and distribution state of pearlite, bainite, etc., so as to ensure that the product has sufficient strength and toughness.

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a Q460 grade earthquake-resistant steel plate with high strength, low yield ratio, and a thickness of 38 mm.

The mechanical properties of the Q460 seismic steel plate prepared in this example are shown in Table 3.

Table 3 Mechanical properties of Q460 grade seismic steel plate

Example 4

The Q460 anti-seismic steel, the percentage composition of the Q460 anti-seismic steel is: C0.05wt%, Si0.25wt%, Mn1.70wt%, S0.032wt%, P0.025wt%, Nb0.035wt%, V0.15wt% %, Ti0.05wt%, N0.005wt%, Als0.015wt%, the rest is Fe and unavoidable impurities.

The method for producing Q460 grade shock-resistant steel with this steckel mill: first, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate feeding and coiling machine is coiled, and then naturally air-cooled to room temperature to obtain a high-strength, low-yield ratio Q460 seismic steel plate. The percentage components of the slab are: C0.05wt%, Si0.25wt%, Mn1.70wt%, S0.032wt%, P0.025wt%, Nb0.035wt%, V0.15wt%, Ti0.05wt%, N0.005wt%, Als0.015wt%, the rest is Fe and unavoidable impurities .

Specific steps are as follows:

Step 1. First, heat the slab at 1230°C for 260 minutes, and the time in the soaking section of the slab is controlled at 45 minutes, so as to ensure that the microalloys such as Nb and V precipitated in the slab are fully re-dissolved and refined. Tensitic grains and preparations for controlled cooling precipitation after rolling, so as to uniform the internal structure of the slab;

Step 2, the slab treated in step 1 is sprayed with water scales on the front and back sides of the slab with a pressure of 18 MPa for 11 seconds;

Step 3. Send the descaled slab in step 2 to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1080°C, conduct 7 passes of continuous rough rolling, and start cooling between passes at the same time water, and the rough rolling is carried out at a rolling speed of 2.4m/s to obtain a rough rolled steel plate;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 25 seconds in the double-stand compact steckel rolling mill, and allow the rough-rolled steel plate to move back and forth on the ground roller for 25 seconds before performing finish rolling, and control the finish rolling The total deformation rate is 55%, allowing the slab after continuous rough rolling to undergo relaxation and precipitation to obtain a rough-rolled slab with a uniform and fine austenite structure, which can effectively prevent the occurrence of mixed crystals, and then the temperature of the rough-rolled steel plate is 870 ℃, the rolling speed is controlled at 4.4m/s, 4 passes of continuous finish rolling are carried out, and the cooling water between passes is turned on, and the finish rolling temperature is controlled at 810°C to prepare a finish rolled steel plate;

Step 5. Send the finished rolled steel plate obtained in step 4 to the coiler for coiling, and control the coiling temperature to 570°C, and simultaneously control the laminar cooling rate to 11°C/s to obtain a steel coil; the laminar cooling rate is 11°C/s s, is to control the precipitation strengthening and solid solution strengthening of the microalloy, and at the same time, by controlling the coiling temperature to achieve the purpose of controlling the transformation morphology, size, quantity and distribution state of pearlite, bainite, etc., so as to ensure that the product has sufficient strength and toughness.

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a Q460 grade earthquake-resistant steel plate with high strength, low yield ratio, and a thickness of 40 mm.

The mechanical properties of the Q460 seismic steel plate prepared in this example are shown in Table 4.

Table 4 Mechanical properties of Q460 seismic steel plate

Example 5

The Q460 anti-seismic steel, the percentage composition of the Q460 anti-seismic steel is: C0.16wt%, Si0.40wt%, Mn1.20wt%, S0.030wt%, P0.025wt%, Nb0.090wt%, V0.05wt% %, Ti0.10wt%, N0.010wt%, Als0.05wt%, the rest is Fe and unavoidable impurities.

The method for producing Q460 grade shock-resistant steel with this steckel mill: first, after heating the slab and spraying water to remove phosphorus, the rough rolling and finish rolling are continuously completed on the same double-stand compact steck The steel plate feeding and coiling machine is coiled, and then naturally air-cooled to room temperature to obtain high-strength, low-yield-ratio Q460-grade seismic steel plates, in which the percentage components of the slab are C0.11wt%, Si0.40wt%, Mn1 .20wt%, S0.030wt%, P0.025wt%, Nb0.090wt%, V0.05wt%, Ti0.10wt%, N0.010wt%, Als0.05wt%, the rest is Fe and unavoidable impurities.

Specific steps are as follows:

Step 1. First, heat the slab at a temperature of 1250°C for 180 minutes, and control the time of the slab in the soaking section to 65 minutes to ensure that the micro-alloys such as Nb and V precipitated in the slab are fully re-dissolved and refined. Tensitic grains and preparations for controlled cooling precipitation after rolling, so as to uniform the internal structure of the slab;

Step 2, the slab treated in step 1 is sprayed with water scales on the front and back sides of the slab with a pressure of 22 MPa for 16 seconds;

Step 3. Send the slab descaled in step 2 to a double-stand compact steckel rolling mill for rolling, and control the rolling start temperature to 1150°C, conduct 6 passes of continuous rough rolling, and start cooling between passes at the same time water, and the rough rolling is carried out at a rolling speed of 2.1m/s to obtain a rough rolled steel plate;

Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 35 seconds in the double-stand compact steckel rolling mill, allow the rough-rolled steel plate to move back and forth on the ground roller for 35 seconds, and then carry out finish rolling, and control the finish rolling The total deformation rate is 50%, allowing the slab after continuous rough rolling to undergo relaxation and precipitation to obtain a rough rolled slab with a uniform and fine austenite structure, which can effectively prevent the occurrence of mixed crystals, and then the temperature of the rough rolled steel plate is 880 ℃, the rolling speed is controlled at 4.2m/s, 8 passes of continuous finish rolling are carried out, and the cooling water between passes is turned on, and the finish rolling temperature is controlled at 850°C to prepare a finish rolled steel plate;

Step 5. Send the finished rolled steel plate obtained in step 4 to the coiler for coiling, and control the coiling temperature to 630°C, and simultaneously control the laminar cooling rate to 16°C/s to obtain a steel coil; the laminar cooling rate is 16°C/s s, is to control the precipitation strengthening and solid solution strengthening of the microalloy, and at the same time, by controlling the coiling temperature to achieve the purpose of controlling the transformation morphology, size, quantity and distribution state of pearlite, bainite, etc., so as to ensure that the product has sufficient strength and toughness.

Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a Q460 grade seismic steel plate with high strength, low yield ratio, and a thickness of 16 mm.

The mechanical properties of the Q460 seismic steel plate prepared in this example are shown in Table 5.

Table 5 Mechanical properties of Q460 grade seismic steel plate

The specific embodiments of the present invention have been described in detail above, but the present invention is not limited to the above-mentioned embodiments, and various changes can also be made without departing from the gist of the present invention within the scope of knowledge possessed by those of ordinary skill in the art. .

Claims (5)

1. A Q460-grade anti-seismic steel, characterized in that: the percentage components of the Q460-grade anti-seismic steel are: C0.05~0.16wt%, Si0.25~0.40wt%, Mn1.20~1.70wt%, S≤ 0.030wt%, P≤0.030wt%, Nb0.035~0.090wt%, V0.05~0.15wt%, Ti0.05~0.10wt%, N≤0.015wt%, Als0.015~0.05wt%, the rest is Fe and other impurities. 2. A method for producing the Q460-grade shock-resistant steel according to claim 1 with a steel coil mill, characterized in that: first, after the slab is heated and sprayed with water to remove phosphorus, the same double-stand compact coil coil Rough rolling and finish rolling are completed continuously on the rolling mill, and the steel plate obtained from the finish rolling is sent to the coiler for coiling, and then naturally air-cooled to room temperature, that is, high-strength, low-yield ratio Q460 seismic steel plate is obtained, and the percentage of slab The components are: C0.05~0.16wt%, Si0.25~0.40wt%, Mn1.20~1.70wt%, S≤0.030wt%, P≤0.030wt%, Nb0.035~0.090wt%, V0. 05~0.15wt%, Ti0.05~0.10wt%, N≤0.015wt%, Als0.015~0.05wt%, and the rest are Fe and other impurities. 3. the method for producing Q460 grade anti-seismic steel with a steel coil mill according to claim 2, is characterized in that concrete steps are as follows: Step 1. First, heat the slab at a temperature of 1230-1270°C for 130-260 minutes, and control the time of the slab in the soaking section to 45-65 minutes; Step 2, spray water scales on the front and back sides of the slab treated in step 1 for 11-16 seconds with high-pressure water with a pressure of 18-22 MPa; Step 3. Send the descaled slab in step 2 to a double-stand compact steckel mill for rolling, and control the rolling start temperature to 1080-1170°C for 4-7 passes of continuous rough rolling. Cooling water between passes to obtain rough-rolled steel plates; Step 4. Continue to delay the rough-rolled steel plate obtained in step 3 for 25-50 seconds in the double-stand compact steckel mill, then make the rough-rolled steel plate temperature 860-890°C, perform 4 passes of continuous finish rolling, and Turn on the cooling water between passes, and control the final rolling temperature to 810~860°C to prepare a finished rolled steel plate; Step 5, sending the finished rolled steel plate obtained in step 4 to a coiler for coiling, and controlling the coiling temperature to 570-630°C, and simultaneously controlling the laminar cooling rate to 11-16°C/s to obtain a steel coil; Step 6. Naturally air-cool the steel plate coil obtained in step 5 to room temperature to obtain a high-strength, low-yield-ratio Q460-grade seismic steel plate. 4. The method for producing Q460 grade shock-resistant steel with a steckel mill according to claim 3, characterized in that: in the step 4, the rough-rolled steel plate continues to be delayed for 25 to 50 seconds in the double-stand compact steckel mill, It is to let the rough-rolled steel plate reciprocate on the ground roller for 25-50 seconds, and then carry out the finish rolling, and control the total deformation rate of the finish rolling to be greater than 48%. 5. The method for producing Q460 shock-resistant steel with a steckel mill according to claim 3, characterized in that the number of passes and rolling speed in the steps 3 and 4 are determined according to different specification requirements.