Stainless steel hot rolling laminar cooling device

Abstract

The utility model discloses a stainless steel hot rolling laminar cooling device, which relates to the technical field of steel rolling and comprises a cooling water main pipe, a manual ball valve, a cooling water branch pipe vertical pipe, a pneumatic ball valve, a metal hose, a cooling water transverse pipe support and a cooling water branch pipe transverse pipe. The cooling water main pipe is connected with the pneumatic ball valve; the pneumatic ball valve is connected with a turbid circulating water pipeline through an elbow; a plurality of cooling water branch vertical pipes are connected with the cooling water main pipe, and manual ball valves are mounted on the cooling water branch vertical pipes; the manual ball valve is connected with the metal hose, and the metal hose is connected with the cooling water branch pipe transverse pipe; the cooling water branch pipe transverse pipe is fixed on the cooling water transverse pipe bracket; and a plurality of nozzles are arranged on the transverse pipes of the cooling water branch pipes. The utility model can solve the problems in the prior art that the temperature of the hot-rolled stainless steel band cannot be effectively controlled and the uniformity of the cross section structure and the mechanical property of the band steel is difficult to guarantee and improve due to online cooling after rolling of the hot-rolled stainless steel band.

Description

TECHNICAL FIELD

[0001] The utility model relates to a rolling steel machinery technical field especially relates to a device for laminar cooling of stainless steel hot rolling strip after finishing rolling of stainless steel hot rolling production line. BACKGROUND

[0002] Hot rolling laminar cooling is a post-rolling online control cooling process of hot rolling steel plate or strip by using laminar water flow. The common laminar cooling method is to place several header pipes containing U-shaped pipes above the output roller way to form a cooling belt and then cool the upper surface of the plate strip.

[0003] If there is no laminar cooling facility after finishing rolling of the stainless steel hot rolling production line, the temperature of the steel strip after finishing rolling cannot be effectively controlled, the performance of the cross-section yield strength and tensile strength of the strip cannot be effectively guaranteed and improved, and the loss of the subsequent processing procedures such as solid solution annealing and the acid pickling re-washing rate and other indicators will also be affected. If a new set of laminar cooling devices is newly installed by using the latest equipment configuration and control method, the initial one-time investment and the subsequent maintenance cost are too high, which is not conducive to the lean control of the production cost. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a stainless steel hot rolling laminar cooling device, which can solve the problem that the post-rolling online cooling of the existing technology to the hot rolling stainless steel strip cannot effectively control the temperature of the hot rolling stainless steel strip and cannot guarantee and improve the uniformity of the cross-section organization and mechanical properties of the strip.

[0005] In order to solve the above problems, the technical scheme of the utility model is as follows: the stainless steel hot rolling laminar cooling device comprises a cooling water main pipe, a manual ball valve, a cooling water branch pipe stand pipe, a pneumatic ball valve, a metal hose, a cooling water cross pipe support and a cooling water branch pipe cross pipe.

[0006] One end of the cooling water main pipe is closed, and the other end is connected with the pneumatic ball valve; the pneumatic ball valve is connected with the turbid ring water pipe way beside the rolling way through an elbow; one end of a plurality of cooling water branch pipe stand pipes is connected with the cooling water main pipe in parallel and at intervals, and the other end of the cooling water branch pipe stand pipe is provided with a manual ball valve; one end of the manual ball valve is connected with the metal hose, and the other end of the metal hose is connected with the cooling water branch pipe cross pipe; the cooling water branch pipe cross pipe is transversely arranged above the rolling way and is fixed on the cooling water cross pipe support by bolts; a plurality of nozzles are arranged on the cooling water branch pipe cross pipe.

[0007] In the above technical scheme, a more specific scheme is that the cooling water main pipe is made of a seamless pipe with a diameter of 114 mm, a specification of DN100 and a length of 10 meters, and is connected with the pneumatic ball valve through a flange.

[0008] Further, the number of the cooling water branch pipe risers (3) is 20, each of which is made of a seamless pipe with a specification of DN40 and a length of 1000mm.

[0009] Further, the manual ball valve has a specification of DN40.

[0010] Further, the metal hose has a specification of DN40, and is connected to the cooling water branch pipe cross pipe through a direct head.

[0011] Further, the cooling water branch pipe cross pipe is made of a seamless pipe with a specification of DN40 and a length of 2000mm.

[0012] Further, the cooling water branch pipe cross pipe is provided with 19 nozzles, and two nozzles are spaced 50mm apart.

[0013] Further, the cooling water cross pipe support is made of a steel pipe with a specification of DN40 and an angle steel with a size of 50*5, and has a height of 1000mm.

[0014] Further, the elbow connected to the pneumatic ball valve has a specification of DN100, and the pneumatic ball valve and the elbow are connected through flanges, and a metal gasket is arranged between the flanges.

[0015] Further, the pipeline center line of the cooling water main pipe is parallel to the pipeline center line of the turbid ring water pipeline, and the pipeline center line of the cooling water branch pipe riser is perpendicular to the pipeline center line of the cooling water main pipe.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. After using the utility model, the temperature of the hot-rolled stainless steel strip after rolling can be reduced by more than 50℃, the temperature difference of the cross section of the strip and the precipitation of carbides in the organization are reduced, the uniformity of the cross section of the strip and the performance is improved, the yield strength uniformity of the cross section of the strip is improved by about 5%, and the tensile strength uniformity is improved by about 4%.

[0018] 2. After using the utility model, the amount of oxide skin generated during the air cooling process of the steel coil can be reduced, the solid solution annealing loss is reduced by more than 0.2%, the ton steel cost can be reduced by about 13 yuan / ton, and the pickling backwash rate can be reduced by about 0.9%.

[0019] 3. After using the utility model, the strip breakage rate of the black skin coil in the subsequent cold rolling process can be effectively reduced by about 5%.

[0020] 4. Under different production requirements, the utility model can be used to select and switch multiple cooling modes, and compared with the state of always opening the laminar cooling water, 10m³ of cooling water can be saved per shift. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a three-dimensional schematic view of the present application;

[0022] Figure 2 is a front view schematic view of the present application;

[0023] Figure 3 is a top view schematic view of the present application;

[0024] Figure 4 is a left view schematic view of the present application;

[0025] Figure 5 is Figure 4 is an enlarged schematic view of A in the middle

[0026] Figure 6 is a schematic view of the wiring of the electric control system;

[0027] Figure 7 is a schematic view of the electric control process of the pneumatic valve.

[0028] The reference signs in the drawing are as follows: 1-cooling water main pipe; 2-hand-operated ball valve; 3-cooling water branch pipe vertical pipe; 4-pneumatic ball valve; 5-metal hose; 6-cooling water cross pipe support; 7-cooling water branch pipe cross pipe; 8-nozzle; 9-roller edge plate; 10-turbid ring water pipe; 11-elbow; 12-roller. DETAILED DESCRIPTION

[0029] The present application is further described below in combination with the drawings and examples:

[0030] Figures 1 to 5 The stainless steel hot-rolling laminar cooling device comprises a cooling water main pipe 1, a cooling water branch pipe, a pneumatic ball valve 4 and a cooling water cross pipe support 6. The cooling water branch pipe comprises a cooling water branch pipe vertical pipe 3, a hand-operated ball valve 2, a metal hose 5 and a cooling water branch pipe cross pipe 7.

[0031] The pipe of the cooling water entering the cooling water main pipe 1 is connected from the turbid ring water pipe 10 beside the roller 12, the turbid ring water pipe 10 beside the roller is connected through welding of an elbow 11 with a specification and model of DN100, the pneumatic ball valve 4 with a specification and model of DN100 is installed behind the elbow 11, flanges are used for connection, and metal gaskets are installed between the flanges to prevent water leakage. The cooling water main pipe 1 is made of a seamless pipe with a diameter of 114mm, a specification and model of DN100 and a length of 10 meters, and is connected to the pneumatic ball valve 4 through flanges, and the pipe center line of the cooling water main pipe 1 is parallel to the turbid ring water pipe 10.

[0032] Twenty 1000mm long cooling water branch pipe risers 3 are fabricated using DN40 seamless steel pipe. Twenty 45mm diameter circular holes are cut into the main cooling water pipe 1, and one end of each cooling water branch pipe riser 3 is welded to it. The centerline of each cooling water branch pipe riser 3 is perpendicular to the main cooling water pipe 1. One end of each cooling water branch pipe riser 3 is connected to one end of a DN40 manual ball valve 2, and the other end of the manual ball valve 2 is connected to one end of a DN40 metal flexible hose 5. The manual ball valve 2 can adjust the flow rate of each cooling water branch pipe. One end of the metal flexible hose 5 is connected to the horizontal cooling water branch pipe 7 via a direct connector. The horizontal cooling water branch pipe 7 is fabricated using DN40 seamless steel pipe, 2000mm long, with 19 12mm diameter holes cut at 50mm intervals on the horizontal pipe. 12mm diameter nozzles 8 are welded to these nozzles, for a total of 19.

[0033] The horizontal cooling water branch pipe 7 is supported by the horizontal cooling water branch pipe bracket 6 and fixed to the bracket 6 with bolts, spanning across the roll table. The horizontal cooling water branch pipe bracket 6 is made of DN40 steel pipe and 50×5 angle steel, with a height of 1000mm. Bolts are vertically welded to the horizontal surface of the roll table side plate 9, and the bracket is fitted over the bolts. The bracket is a split type for easy disassembly and can be removed together with the corresponding roll table side plate 9. Throughout the stainless steel rolling production process, the pneumatic ball valve 4 is controlled by the PLC electrical control system in the mill control room.

Claims

1. A laminar flow cooling device for hot-rolled stainless steel, characterized in that: Includes cooling water main pipe (1), manual ball valve (2), cooling water branch pipe riser (3), pneumatic ball valve (4), metal hose (5), cooling water horizontal pipe support (6) and cooling water branch pipe horizontal pipe (7); One end of the main cooling water pipe (1) is closed, and the other end is connected to the pneumatic ball valve (4); the pneumatic ball valve (4) is connected to the turbid circulating water pipe (10) beside the rolling mill through an elbow (11); one end of several cooling water branch risers (3) is connected to the main cooling water pipe (1), and a manual ball valve (2) is installed at the other end of the cooling water branch risers (3); the manual ball valve (2) is connected to one end of the metal hose (5), and the other end of the metal hose (5) is connected to the cooling water branch horizontal pipe (7); the cooling water branch horizontal pipe (7) is fixed on the cooling water horizontal pipe support (6); several nozzles (8) are provided on the cooling water branch horizontal pipe (7).

2. The stainless steel hot-rolled laminar flow cooling device according to claim 1, characterized in that: The cooling water main pipe (1) is made of a seamless pipe with a diameter of 114mm, a specification of DN100, and a length of 10 meters, and is connected to the pneumatic ball valve (4) through a flange.

3. The stainless steel hot-rolled laminar flow cooling device according to claim 1 or 2, characterized in that: The number of cooling water branch pipes (3) is 20; each is made of seamless pipe with a specification of DN40 and a length of 1000mm.

4. The stainless steel hot-rolled laminar flow cooling device according to claim 3, characterized in that: The manual ball valve (2) has a specification of DN40.

5. The stainless steel hot-rolled laminar flow cooling device according to claim 4, characterized in that: The metal hose (5) is DN40; the metal hose (5) is connected to the cooling water branch pipe (7) via a direct connector.

6. The stainless steel hot-rolled laminar flow cooling device according to claim 5, characterized in that: The horizontal cooling water branch pipe (7) is made of a DN40 seamless pipe with a length of 2000mm.

7. The stainless steel hot-rolled laminar flow cooling device according to claim 6, characterized in that: The horizontal pipe (7) of the cooling water branch pipe is provided with 19 nozzles (8); the two nozzles (8) are spaced 50 mm apart.

8. The stainless steel hot-rolled laminar flow cooling device according to claim 7, characterized in that: The cooling water horizontal pipe support (6) is made of DN40 steel pipe and 50×5 angle steel, with a height of 1000mm.

9. The stainless steel hot-rolled laminar flow cooling device according to claim 8, characterized in that: The elbow connected to the pneumatic ball valve (4) is DN100. The pneumatic ball valve (4) and the elbow are connected by a flange, and a metal gasket is installed between the flanges.

10. The stainless steel hot-rolled laminar flow cooling device according to claim 8, characterized in that: The centerline of the cooling water main pipe (1) is parallel to the centerline of the turbid circulating water pipe (10); the centerline of the cooling water branch riser (3) is perpendicular to the centerline of the cooling water main pipe (1).

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