Brass strip suitable for high speed stamping and process for producing the same

Abstract

The present application relates to the technical field of metal processing, in particular to a brass strip suitable for high-speed stamping and a preparation process thereof, the preparation process comprises seven procedures, which are (1) copper melting, (2) rough rolling, (3) hot rolling, (4) face milling, (5) first cold rolling, (6) second cold rolling and (7) pickling, the Vickers hardness HV of the prepared brass strip suitable for high-speed stamping is 145-160, the surface roughness Ra is 0.08-0.14 microns, the surface is smooth and defect-free, and the demand of high-speed stamping is met.

Description

Technical Field

[0001] The present invention relates to the technical field of metal processing, in particular to a brass strip suitable for high-speed stamping and a preparation process thereof. Background Art

[0002] With the rapid development of electrical equipment-related technologies, the production capacity of press lines continues to increase. Currently, high-speed servo automatic press lines can achieve a trouble-free stroke rate of 20 strokes / min, and stamping dies can achieve a trouble-free stroke rate of 15 strokes / min, and even as high as 18 strokes / min. With this increase in stroke rate, the instantaneous impact force of the stamping process is also greater, which places higher demands on the surface quality of the stamping material. Currently, existing brass strip can no longer meet the demand for higher stroke rates.

[0003] Brass is an alloy of copper and zinc. Brass composed solely of copper and zinc is called common brass, while alloys composed of two or more elements are called specialty brass. Brass strip is produced through a process of ingot casting, cold rolling, hot rolling, annealing, pickling, and polishing. Because brass contains 30-46% zinc, dezincification can occur during annealing, leading to surface defects. During pickling, the high zinc content can lead to acid dezincification, further affecting surface quality. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a brass strip suitable for high-speed stamping and a preparation process thereof, so as to solve the problem that the surface quality of the existing brass strip cannot meet the requirements of high-speed stamping.

[0005] Based on the above objectives, the present invention provides a process for preparing brass strip suitable for high-speed stamping, and the specific preparation steps are as follows:

[0006] (1) Copper melting: After the electrolytic copper plate and zinc ingot are weighed according to the composition standard of H65 brass, the electrolytic copper plate is first added to the copper water furnace for heating and melting according to the different melting points of the two materials, and then the zinc ingot is added to melt. After stirring, slag removal, and composition inspection, when the temperature of the molten copper water is adjusted to 1040-1070℃, the molten copper water in the copper water furnace is poured into the water-cooled crystallizer through the flow pipe body, and a special casting machine is used to cast an ingot with a thickness of 260mm;

[0007] (2) Rough rolling: the ingot with a thickness of 260 mm in step (1) is placed in a walking beam heating furnace for heating at a temperature of 855-870°C for 4 hours, and then enters a two-roll hot rolling mill for multi-pass rolling. The hot rolling mill specification is that the main engine speed does not exceed 150 m / min. After the ingot is rolled to 17.0 mm, it is water-cooled online and finally coiled and unloaded using a five-roll coreless coiler to obtain a strip with a thickness of 17.0 mm;

[0008] (3) Hot rolling: The strip with a thickness of 17.0 mm in step (2) is subjected to two hot rolling processes at a temperature of 700-800° C. The thicknesses before the two hot rolling processes are 17.0 mm and 11.0 mm, respectively, to obtain a strip with a thickness of 7.0 mm;

[0009] (4) Milling: The upper and lower surfaces of the strip blank with a thickness of 7.0 mm in step (2) are milled using a milling machine at a milling speed of 7-8 m / min. The milling amount of the upper and lower surfaces of the strip blank is 0.55 mm each, and a strip blank with a thickness of 5.9 mm is obtained;

[0010] (5) Primary cold rolling: The strip with a thickness of 5.9 mm obtained in step (4) is annealed in a bell furnace, cooled, wetted in a zirconium oxide dispersion having a particle size of 50-100 nm, and then cold rolled using a rolling roll with a roughness Ra of 1.2-1.8 μm to obtain a strip with a thickness of 3.5 mm;

[0011] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) is placed in a bell-type furnace for annealing. After cooling, it is wetted in a zirconium oxide dispersion with a particle size of 20-40 nm. Then, it is cold rolled using a rolling mill with a roughness Ra of 0.8-1 μm to obtain a strip with a thickness of 1.8 mm.

[0012] (7) Pickling: The strip with a thickness of 1.8 mm obtained in step (6) is placed in a dilute sulfuric acid washing tank at a pickling speed of 20-40 m / min. After the pickling is completed, the strip is placed in a water tank for water washing to obtain a brass strip suitable for high-speed stamping.

[0013] Preferably, the composition of the electrolytic copper plate in step (1) is 98-99.9wt% copper, 0.001-0.03wt% iron, 0.001-0.03wt% lead, and the remainder is zinc.

[0014] Preferably, the zirconium oxide dispersion in step (5) is an aqueous dispersion of zirconium oxide, wherein the concentration of zirconium oxide is 10-15 wt%.

[0015] Preferably, the zirconium oxide dispersion in step (6) is an aqueous dispersion of zirconium oxide, wherein the concentration of zirconium oxide is 5-8 wt%.

[0016] Preferably, the annealing temperature in step (5) is 430-550° C. and the time is 5 hours.

[0017] Preferably, the annealing temperature in step (6) is 380-460° C. and the time is 5 hours.

[0018] Preferably, the concentration of dilute sulfuric acid in step (7) is 10-12 wt%.

[0019] Furthermore, the present invention also provides a brass strip suitable for high-speed stamping, wherein the brass strip suitable for high-speed stamping is obtained according to the above-mentioned preparation process of the brass strip suitable for high-speed stamping.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a process for preparing a brass strip suitable for high-speed stamping, comprising seven steps: (1) copper melting, (2) rough rolling, (3) hot rolling, (4) face milling, (5) primary cold rolling, (6) secondary cold rolling, and (7) pickling. The prepared brass strip suitable for high-speed stamping has a Vickers hardness HV of 145-160 and a surface roughness Ra of 0.08-0.14 μm. The surface is smooth and defect-free, meeting the requirements of high-speed stamping.

[0022] The present invention improves the traditional cold rolling process into a single cold rolling and a double cold rolling. In the single cold rolling, a low annealing temperature slows down the dezincification phenomenon. In the cold rolling process, a layer of zirconium oxide is attached to the surface of the copper strip in advance to make up for surface defects. In addition, a rolling roll with low surface roughness is used to improve the surface quality of the copper strip after rolling. In the double cold rolling, the annealing temperature, the particle size of zirconium oxide and the surface roughness of the rolling roll are further reduced to further improve the surface quality. In the subsequent pickling, tiny protrusions and oxide films on the surface are corroded and removed, and then the zirconium oxide falls off. Photoelectron spectroscopy detection on the surface of the finished product does not detect the presence of zirconium. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to specific embodiments.

[0024] The present invention relates to the source of materials as follows

[0025] In the specific embodiment of the present invention, the electrolytic copper plate is purchased from outside, and its composition is 99.845wt% copper, 0.001wt% iron, 0.001wt% lead, and the balance is zinc.

[0026] Example 1

[0027] A preparation process for brass strip suitable for high-speed stamping, the specific preparation steps are as follows:

[0028] (1) Copper melting: After the electrolytic copper plate and zinc ingot are weighed according to the composition standard of H65 brass, the electrolytic copper plate is first added to the copper water furnace for heating and melting according to the different melting points of the two materials, and then the zinc ingot is added to melt. After stirring, slag removal, and composition inspection, when the temperature of the molten copper water is adjusted to 1040°C, the molten copper in the copper water furnace is poured into the water-cooled crystallizer through the flow pipe body, and a special casting machine is used to cast an ingot with a thickness of 260 mm;

[0029] (2) Rough rolling: the ingot with a thickness of 260 mm in step (1) is placed in a walking beam heating furnace for heating at a temperature of 855° C. for 4 h, and then enters a two-roll hot rolling mill for multi-pass rolling. The hot rolling mill specification is that the main engine speed is 100 m / min. After the ingot is rolled to 17.0 mm, it is water-cooled online and finally coiled and unloaded using a five-roll coreless coiler to obtain a strip with a thickness of 17.0 mm;

[0030] (3) Hot rolling: The strip with a thickness of 17.0 mm in step (2) is subjected to two hot rolling processes at a temperature of 700° C. The thicknesses before the two hot rolling processes are 17.0 mm and 11.0 mm, respectively, to obtain a strip with a thickness of 7.0 mm;

[0031] (4) Milling: The upper and lower surfaces of the strip blank with a thickness of 7.0 mm in step (2) were milled using a milling machine at a milling speed of 7 m / min. The milling amount of the upper and lower surfaces of the strip blank was 0.55 mm each, and a strip blank with a thickness of 5.9 mm was obtained;

[0032] (5) Primary cold rolling: The strip with a thickness of 5.9 mm obtained in step (4) was annealed in a bell-type furnace at a temperature of 430° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 10 wt % and a zirconium oxide particle size of 50 nm. The strip was then cold rolled using a rolling roll with a roughness of Ra = 1.2 μm to obtain a strip with a thickness of 3.5 mm.

[0033] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was annealed in a bell-type furnace at a temperature of 380° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 5 wt % and a particle size of 20 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 0.8 μm to obtain a strip with a thickness of 1.8 mm.

[0034] (7) Pickling: The strip with a thickness of 1.8 mm obtained in step (6) is placed in a dilute sulfuric acid washing tank with a dilute sulfuric acid concentration of 10 wt % and a pickling speed of 20 m / min. After the pickling is completed, the strip is placed in a water tank for water washing to obtain a brass strip suitable for high-speed stamping.

[0035] Example 2

[0036] A preparation process for brass strip suitable for high-speed stamping, the specific preparation steps are as follows:

[0037] (1) Copper melting: After the electrolytic copper plate and zinc ingot are weighed according to the composition standard of H65 brass, the electrolytic copper plate is first added to the copper water furnace for heating and melting according to the different melting points of the two materials, and then the zinc ingot is added to melt. After stirring, slag removal, and composition inspection, when the temperature of the molten copper water is adjusted to 1055°C, the molten copper water in the copper water furnace is poured into the water-cooled crystallizer through the flow pipe body, and a special drawing machine is used to draw out an ingot with a thickness of 260 mm;

[0038] (2) Rough rolling: the ingot with a thickness of 260 mm in step (1) is placed in a walking beam heating furnace for heating at a temperature of 863° C. for 4 h, and then enters a two-roll hot rolling mill for multi-pass rolling. The hot rolling mill specification is that the main engine speed is 100 m / min. After the ingot is rolled to 17.0 mm, it is water-cooled online and finally coiled and unloaded using a five-roll coreless coiler to obtain a strip with a thickness of 17.0 mm;

[0039] (3) Hot rolling: The strip with a thickness of 17.0 mm obtained in step (2) is subjected to two hot rolling processes at a temperature of 750° C. The thicknesses before the two hot rolling processes are 17.0 mm and 11.0 mm, respectively, to obtain a strip with a thickness of 7.0 mm;

[0040] (4) Milling: The upper and lower surfaces of the strip blank with a thickness of 7.0 mm in step (2) were milled using a milling machine at a milling speed of 7.5 m / min. The milling depth of the upper and lower surfaces of the strip blank was 0.55 mm each, and a strip blank with a thickness of 5.9 mm was obtained;

[0041] (5) Primary cold rolling: The strip with a thickness of 5.9 mm obtained in step (4) was annealed in a bell-type furnace at a temperature of 490° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 12.5 wt % and a zirconium oxide particle size of 76 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 1.5 μm to obtain a strip with a thickness of 3.5 mm.

[0042] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was annealed in a bell-type furnace at a temperature of 420° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 6 wt % and a zirconium oxide particle size of 30 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 0.9 μm to obtain a strip with a thickness of 1.8 mm.

[0043] (7) Pickling: The strip with a thickness of 1.8 mm obtained in step (6) is placed in a dilute sulfuric acid washing tank with a dilute sulfuric acid concentration of 11 wt % and a pickling speed of 30 m / min. After the pickling is completed, the strip is placed in a water tank for water washing to obtain a brass strip suitable for high-speed stamping.

[0044] Example 3

[0045] A preparation process for brass strip suitable for high-speed stamping, the specific preparation steps are as follows:

[0046] (1) Copper melting: After the electrolytic copper plate and zinc ingot are weighed according to the composition standard of H65 brass, the electrolytic copper plate is first added to the copper water furnace for heating and melting according to the different melting points of the two materials, and then the zinc ingot is added to melt. After stirring, slag removal, and composition inspection, when the temperature of the molten copper water is adjusted to 1070°C, the molten copper in the copper water furnace is poured into the water-cooled crystallizer through the flow pipe body, and a special casting machine is used to cast an ingot with a thickness of 260 mm;

[0047] (2) Rough rolling: the ingot with a thickness of 260 mm in step (1) is placed in a walking beam heating furnace for heating at a temperature of 870° C. for 4 h, and then enters a two-roll hot rolling mill for multi-pass rolling. The hot rolling mill specification is that the main engine speed is 100 m / min. After the ingot is rolled to 17.0 mm, it is water-cooled online and finally coiled and unloaded using a five-roll coreless coiler to obtain a strip with a thickness of 17.0 mm;

[0048] (3) Hot rolling: The strip with a thickness of 17.0 mm in step (2) is subjected to two hot rollings at a temperature of 800° C. The thicknesses before the two hot rollings are 17.0 mm and 11.0 mm, respectively, to obtain a strip with a thickness of 7.0 mm;

[0049] (4) Milling: The upper and lower surfaces of the strip blank with a thickness of 7.0 mm in step (2) were milled using a milling machine at a milling speed of 8 m / min. The milling amount of the upper and lower surfaces of the strip blank was 0.55 mm each, and a strip blank with a thickness of 5.9 mm was obtained;

[0050] (5) Primary cold rolling: The strip with a thickness of 5.9 mm obtained in step (4) was annealed in a bell-type furnace at a temperature of 550° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 15 wt % and a zirconium oxide particle size of 100 nm. The strip was then cold rolled using a rolling roll with a roughness of Ra = 1.8 μm to obtain a strip with a thickness of 3.5 mm.

[0051] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was annealed in a bell-type furnace at a temperature of 460° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 8 wt % and a zirconium oxide particle size of 40 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 1 μm to obtain a strip with a thickness of 1.8 mm.

[0052] (7) Pickling: The strip with a thickness of 1.8 mm obtained in step (6) is placed in a dilute sulfuric acid washing tank with a dilute sulfuric acid concentration of 12 wt % and a pickling speed of 40 m / min. After the pickling is completed, the strip is placed in a water tank for water washing to obtain a brass strip suitable for high-speed stamping.

[0053] Comparative Example 1

[0054] A preparation process for a brass strip, the specific preparation steps are as follows:

[0055] (1) Melting copper: same as in Example 2;

[0056] (2) Rough rolling: same as in Example 2;

[0057] (3) Hot rolling: same as in Example 2;

[0058] (4) Milling surface: same as in Example 2;

[0059] (5) Primary cold rolling: The strip with a thickness of 5.5 mm obtained in step (4) was placed in a bell-type furnace for annealing at a temperature of 430° C. for 5 h. After cooling, the strip was cold rolled using a rolling mill with a roughness of Ra = 1.4 μm to obtain a strip with a thickness of 3.5 mm.

[0060] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was placed in a bell-type furnace for annealing at a temperature of 380° C. for 5 h. After cooling, it was cold rolled using a rolling mill with a roughness of Ra = 0.9 μm to obtain a strip with a thickness of 1.8 mm.

[0061] (7) Pickling: same as in Example 2;

[0062] Comparative Example 2

[0063] A preparation process for a brass strip, the specific preparation steps are as follows:

[0064] (1) Melting copper: same as in Example 2;

[0065] (2) Rough rolling: same as in Example 2;

[0066] (3) Hot rolling: same as in Example 2;

[0067] (4) Milling surface: same as in Example 2;

[0068] (5) Primary cold rolling: The strip with a thickness of 5.5 mm obtained in step (4) was annealed in a bell-type furnace at a temperature of 490° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 12.5 wt % and a zirconium oxide particle size of 76 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 3 μm to obtain a strip with a thickness of 3.5 mm.

[0069] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was annealed in a bell-type furnace at a temperature of 420° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 6 wt % and a zirconium oxide particle size of 30 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 3 μm to obtain a strip with a thickness of 1.8 mm.

[0070] (7) Pickling: Same as Example 2.

[0071] Comparative Example 3

[0072] A preparation process for a brass strip, the specific preparation steps are as follows:

[0073] (1) Melting copper: same as in Example 2;

[0074] (2) Rough rolling: same as in Example 2;

[0075] (3) Hot rolling: same as in Example 2;

[0076] (4) Milling surface: same as in Example 2;

[0077] (5) Primary cold rolling: The strip with a thickness of 5.5 mm obtained in step (4) was annealed in a bell-type furnace at a temperature of 800° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 12.5 wt % and a zirconium oxide particle size of 76 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 1.5 μm to obtain a strip with a thickness of 3.5 mm.

[0078] (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) was annealed in a bell-type furnace at a temperature of 800° C. for 5 h. After cooling, the strip was wetted in a zirconium oxide dispersion having a zirconium oxide concentration of 6 wt % and a zirconium oxide particle size of 30 nm. The strip was then cold rolled using a rolling mill with a roughness of Ra = 0.9 μm to obtain a strip with a thickness of 1.8 mm.

[0079] (7) Pickling: Same as Example 2.

[0080] Performance Testing

[0081] Surface roughness: Referring to the national standard GB / T 29847-2013, the surface roughness of the brass strips prepared in Examples 1-3 and Comparative Examples 1-3 was tested. Five different positions were selected for each brass strip sample for measurement. Each position was measured three times, and the average value of each group of samples was finally taken. The test results are shown in Table 1.

[0082] Vickers hardness: According to the national standard GB / T4340.1-2009, five points at different locations on the brass strips prepared in Examples 1-3 and Comparative Examples 1-3 were tested. The test force was 20 kN, and the hardness symbol was HV20. The average value was taken as the Vickers hardness value. The test results are shown in Table 1.

[0083] Surface defects: Use a metallographic microscope to observe whether there are obvious defects on the surfaces of the copper strips prepared in Examples 1-3 and Comparative Examples 1-3, with a magnification of 300 times.

[0084] Photoelectron spectroscopy detection: Detect zirconium element using Al Kα X-ray as the excitation source, with a detection limit of 0.1%.

[0085] Table 1 Performance test results

[0086]

[0087] Data analysis: It can be seen from Examples 1-3 that the brass strip suitable for high-speed stamping prepared by the present invention has a Vickers hardness HV of 145-160, a surface roughness Ra of 0.07-0.09 μm, a smooth surface without defects, and meets the requirements of high-speed stamping. It can be seen from Example 2 and Comparative Examples 1-3 that the annealing temperature in the cold rolling of the present invention, the surface roughness of zirconium oxide and the rolling roll jointly promote the improvement of the surface quality of the brass strip.

[0088] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Within the scope of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0089] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, 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 process for preparing brass strip suitable for high-speed stamping, characterized in that: The specific preparation steps are as follows: (1) Copper melting: After the electrolytic copper plate and zinc ingot are weighed according to the composition standard of H65 brass, the electrolytic copper plate is first added to the copper water furnace for heating and melting according to the different melting points of the two materials, and then the zinc ingot is added to melt. After stirring, slag removal, and composition inspection, when the temperature of the molten copper water is adjusted to 1040-1070℃, the molten copper water in the copper water furnace is poured into the water-cooled crystallizer through the flow pipe body, and a special casting machine is used to cast an ingot with a thickness of 260mm; (2) Rough rolling: the ingot with a thickness of 260 mm in step (1) is placed in a walking beam heating furnace for heating at a temperature of 855-870°C for 4 hours, and then enters a two-roll hot rolling mill for multi-pass rolling. The hot rolling mill specification is that the main engine speed does not exceed 150 m / min. After the ingot is rolled to 17.0 mm, it is water-cooled online and finally coiled and unloaded using a five-roll coreless coiler to obtain a strip with a thickness of 17.0 mm; (3) Hot rolling: The strip with a thickness of 17.0 mm in step (2) is subjected to two hot rolling processes at a temperature of 700-800° C. The thicknesses before the two hot rolling processes are 17.0 mm and 11.0 mm, respectively, to obtain a strip with a thickness of 7.0 mm; (4) Milling: The upper and lower surfaces of the strip blank with a thickness of 7.0 mm in step (2) are milled using a milling machine at a milling speed of 7-8 m / min. The milling amount of the upper and lower surfaces of the strip blank is 0.55 mm each, and a strip blank with a thickness of 5.9 mm is obtained; (5) Primary cold rolling: The strip with a thickness of 5.9 mm obtained in step (4) is annealed in a bell furnace, cooled, wetted in a zirconium oxide dispersion having a particle size of 50-100 nm, and then cold rolled using a rolling roll with a roughness Ra of 1.2-1.8 μm to obtain a strip with a thickness of 3.5 mm; (6) Secondary cold rolling: The strip with a thickness of 3.5 mm obtained in step (5) is placed in a bell-type furnace for annealing, cooled, wetted in a zirconium oxide dispersion with a particle size of 20-40 nm, and then cold rolled using a rolling mill with a roughness of Ra = 0.8-1 μm to obtain a strip with a thickness of 1.8 mm; (7) Pickling: The strip with a thickness of 1.8 mm obtained in step (6) is placed in a dilute sulfuric acid washing tank at a pickling speed of 20-40 m / min. After the pickling is completed, the strip is placed in a water tank for water washing to obtain a brass strip suitable for high-speed stamping.

2. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: The composition of the electrolytic copper plate in step (1) is 98-99.9wt% copper, 0.001-0.03wt% iron, 0.001-0.03wt% lead, and the remainder is zinc.

3. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: The zirconium oxide dispersion in step (5) is an aqueous dispersion of zirconium oxide, wherein the concentration of zirconium oxide is 10-15 wt%.

4. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: The zirconium oxide dispersion in step (6) is an aqueous dispersion of zirconium oxide, wherein the concentration of zirconium oxide is 5-8 wt %.

5. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: In the step (5), the annealing temperature is 430-550° C. and the time is 5 hours.

6. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: In the step (6), the annealing temperature is 380-460° C. and the time is 5 h.

7. The process for preparing brass strip suitable for high-speed stamping according to claim 1, characterized in that: The concentration of the dilute sulfuric acid in step (6) is 10-12 wt%.

8. A brass strip suitable for high-speed stamping, characterized in that: The brass strip suitable for high-speed stamping is obtained according to the preparation process of the brass strip suitable for high-speed stamping according to any one of claims 1 to 7.

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