A leaded brass alloy, its preparation method and application

Abstract

The present application relates to a lead brass alloy, comprising: Cu, Pb, and Zn; and, 56.0%≤m Cu ≤59.0%, 2.2%≤m Pb ≤3.2%; wherein, m Cu represents the mass percentage of the Cu in the brass alloy, m Pb represents the mass percentage of the Pb in the brass alloy; and, the lead brass alloy comprises: a matrix phase and a second phase; the matrix phase comprises: an alpha phase and a beta phase, the second phase comprises: a gamma phase, a Pb phase, and an intermetallic compound; the intermetallic compound comprises: at least one of FeAlCe, Fe3B, AlB2, FeNiB, or AlZrEr; wherein, the area percentage of the beta phase is 64%-68%, the area percentage of the Pb phase is 0.1%-0.5%, and the area percentage of the intermetallic compound is 0.01%-0.1%. The lead brass alloy of the present application exhibits excellent cutting properties when machining, avoids the common curling phenomenon of traditional materials, and produces easy-to-handle chippings when drilling, the cutting edges are round and uniform, without any broken edges and powder problems, the surface flatness is below 0.05mm, the surface hardness fluctuation is within 5%, the length is between ±0.10, the width is between ±0.10, and the thickness is between ±0.05, which significantly improves the production quality and efficiency of floor drains.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical materials, and particularly relates to a lead brass alloy and a preparation method and application thereof. BACKGROUND

[0002] Floor drain, as a key component connecting drainage pipe system and indoor floor, plays a vital role in the drainage system of residential and commercial buildings. Its performance not only affects the smooth operation of the drainage system, but also is directly related to the sanitary condition of the living environment and human health. With the continuous improvement of people's living standards, the demand for living quality is increasing, and the floor drain, as a detail part, has gradually become an important element to reflect high-end design and material application.

[0003] Lead brass floor drain is widely used in high-end hotels, villas, luxury residences and indoor and outdoor landscape projects due to its unique material advantages, such as excellent corrosion resistance, good mechanical strength and unique metal texture. Lead brass floor drain not only has elegant appearance, but also has high durability and easy maintenance characteristics, which meets the dual needs of consumers for aesthetics and practicality.

[0004] However, the production process of traditional floor drain plate, red punching sample method (continuous casting, red punching, sand throwing, turning, fine carving, polishing, electroplating, assembly), has significant defects. This series of lengthy procedures not only increases the production cost, but also increases the difficulty of product quality control due to the complexity of the process flow. Especially for products with very high flatness requirements, it is a challenge to achieve a flatness standard of less than 0.05 mm, which to a large extent limits the further development of the floor drain industry.

[0005] Therefore, there is an urgent need for a lead brass alloy and a preparation method and application thereof. SUMMARY

[0006] The purpose of the present application is to provide a lead brass alloy and a preparation method and application thereof to overcome the deficiencies in the prior art.

[0007] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0008] The first aspect of the present application is to provide a lead brass alloy, comprising: Cu, Pb, and Zn; and,

[0009] 56.0%≤m Cu ≤59.0%, 2.2%≤m Pb ≤3.2%;

[0010] wherein, m Cu represents the mass percentage of Cu in the brass alloy, m Pb represents the mass percentage of Pb in the brass alloy.

[0011] and the lead brass alloy comprises: a matrix phase and a second phase; the matrix phase comprises: an alpha phase and a beta phase, and the second phase comprises: a gamma phase, a Pb phase, and an intermetallic compound; the intermetallic compound comprises: at least one of FeAlCe, Fe3B, AlB2, FeNiB, or AlZrEr;

[0012] wherein the area percentage of the beta phase is 64%-68%, the area percentage of the Pb phase is 0.1%-0.5%, and the area percentage of the intermetallic compound is 0.01%-0.1%.

[0013] The present application forms an intermetallic compound (at least one of FeAlCe, Fe3B, AlB2, FeNiB, or AlZrEr) as a fine crystal core by adding specific impurities such as copper boron rare earth particles, induces a large number of heterogeneous nucleation, effectively refines the grain structure, eliminates developed columnar dendrites and local crystallization abnormal phenomena such as mixed crystals and weak crystallization, thereby significantly improving the mechanical properties and processing performance of the plate, and the specific principle is that:

[0014] Fe+Al+Ce→FeAlCe;

[0015] 3Fe+B→Fe3B;

[0016] Al+2B→AlB2;

[0017] Ni+Fe+B→FeNiB;

[0018] Al+Zr+Er→AlZrEr.

[0019] Preferably, further comprising: Fe; and,

[0020] m Fe ≤0.7%;

[0021] wherein m Fe represents the mass percentage of the Fe in the brass alloy.

[0022] Preferably, the particle size of the alpha phase is 20-35 μm.

[0023] Preferably, the particle size of the Pb phase is 1-5 μm.

[0024] Preferably, the particle size of the intermetallic compound is 0.1-1.0 μm.

[0025] The second aspect of the present application is to provide a preparation method of the lead brass alloy as described above, and the steps comprise:

[0026] The raw materials are sequentially subjected to smelting treatment and direct chill casting to obtain a casting blank;

[0027] The casting blank is sequentially subjected to hot rolling treatment, first intermediate rolling treatment, annealing treatment, second intermediate rolling treatment, pickling treatment and finish rolling treatment to obtain the lead brass alloy.

[0028] Preferably, the steps include:

[0029] Step one, the processed return material is subjected to first melting treatment; scrap copper is added and the material is subjected to second melting treatment;

[0030] Step two, a slag remover is added and the material is subjected to slag skimming treatment; a refining agent is added and the material is subjected to refining treatment;

[0031] Step three, the material is sampled and the sampled sample is subjected to composition testing to determine whether the composition of the sample meets:

[0032] 56.0%≤m Cu ≤59.0%, 2.2%≤m Pb ≤3.2%;

[0033] If not, the corresponding material is supplemented and the step three is returned to;

[0034] If yes, step four is entered;

[0035] Step four, the material is subjected to direct chill casting to obtain the casting blank;

[0036] Step five, the casting blank is sequentially subjected to the hot rolling treatment, the first intermediate rolling treatment, the annealing treatment, the second intermediate rolling treatment, the pickling treatment, the finish rolling treatment to obtain the lead brass alloy.

[0037] Preferably, the voltage of the first melting treatment is 300V-500V; the temperature of the second melting treatment is 980℃-1020℃.

[0038] Preferably, the temperature of the slag skimming treatment is 1030℃-1050℃; the temperature of the refining treatment is 1010℃-1040℃.

[0039] Preferably, the initial temperature of the direct chill casting is 1060℃-1180℃, the stable temperature is 1000℃-1040℃, the speed is 80mm / min-120mm / min, and the temperature difference between the water inlet and the water outlet of the water cooling is 15℃-20℃.

[0040] Preferably, the rolling temperature of the hot rolling treatment is 750℃-850℃; the annealing temperature of the interpass annealing treatment is 620℃-680℃, the heating time is 1h-3h, and the annealing time is 5h-7h.

[0041] The application optimizes the hot rolling treatment parameters, controls the proportion and morphology of the phase organization inside the material, makes the lead element uniformly distributed, suppresses the generation of reticular Pb phase organization, promotes the formation of easy cutting beta phase organization, solves the powder dropping and edge breaking problems in the plate cutting process, and improves the surface integrity and aesthetics of the finished product.

[0042] The application adopts high-temperature long-time passage annealing treatment, promotes the full diffusion of the segregated elements in the solid state, realizes the balanced distribution of the composition of the casting blank, eliminates the composition segregation problem in the casting process, and ensures the uniformity and stability of the alloy material.

[0043] The passage annealing treatment of the application adopts a stepped heat treatment strategy, precisely controls the recovery and recrystallization process of the lattice distortion of the plate after rolling, ensures sufficient recrystallization grain refinement, effectively eliminates the plate warping and edge warping angle phenomenon, and realizes the high-precision requirement that the flatness of the plate is less than 0.05mm.

[0044] The third aspect of the application is to provide a lead brass alloy as described above or a lead brass alloy prepared by the preparation method as described above for use in a floor drain.

[0045] The application adopts the above technical scheme, and has the following technical effects compared with the prior art:

[0046] The lead brass alloy of the application exhibits excellent cutting characteristics during machining, avoids the common curling and crumb phenomenon of traditional materials, generates only easy-to-handle debris during drilling, and the cutting edge is round and uniform without any edge breaking and powder dropping problem, the surface flatness is below 0.05mm, the surface hardness fluctuation is within 5%, the length is between ±0.10, the width is between ±0.10, and the thickness is between ±0.05, which significantly improves the production quality and efficiency of the floor drain. BRIEF DESCRIPTION OF DRAWINGS

[0047] Fig. 1 It is a microstructure diagram of the lead brass alloy in Example 1 of the application;

[0048] Fig. 2 It is a Pb phase distribution diagram of the lead brass alloy in Example 1 of the application;

[0049] Fig. 3 It is a microstructure diagram of the lead brass alloy in Example 2 of the application;

[0050] Fig. 4 It is a Pb phase distribution diagram of the lead brass alloy in Example 2 of the application;

[0051] Fig. 5 It is a microstructure diagram of the lead brass alloy in Comparative Example 1 of the application;

[0052] Fig. 6 This is a Pb phase distribution diagram of the lead-brass alloy in Comparative Example 1 of the present invention. Detailed Implementation

[0053] The specific embodiments of the present invention will be described in detail below.

[0054] Unless otherwise defined, the technical or scientific terms used in the claims and description shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0055] The word "comprising" or similar terms used in the specification and claims of this patent application mean that the objects preceding "comprising" include the objects listed after "comprising" or their equivalents, and do not exclude other objects.

[0056] The numerical values ​​mentioned in this invention include all values ​​increasing one unit at a time from low to high, assuming that there is at least a two-unit interval between any lower and higher value. For example, if it is said that a component quantity or a physical quantity is better from 1 to 100, 10 to 90, and 20 to 80, it means that values ​​such as 5 to 95, 14 to 76, 23 to 67, 32 to 58, and 41 to 49 are clearly listed in this specification; for values ​​less than 1, 0.0001, 0.001, 0.01, or 0.1 are considered to be a suitable unit. The foregoing examples are for illustrative purposes only; in practice, all combinations of values ​​between the lowest and highest listed values ​​are considered to be clearly listed in this specification in a similar manner.

[0057] Example 1

[0058] This embodiment provides a leaded brass alloy comprising, by mass percentage: 56.5% Cu, 2.8% Pb, 0.4% Fe, and the balance being zinc and unavoidable impurity elements.

[0059] This embodiment also provides a method for preparing the lead-brass alloy as described above, the steps of which include:

[0060] Step 1: Transfer 1000kg of processed waste material to a 2.5t industrial frequency furnace, and adjust the voltage of the industrial frequency furnace to 400V to perform the first melting treatment on the processed waste material in the industrial frequency furnace;

[0061] 1000 kg of scrap copper is transferred to the industrial frequency furnace, and the material in the industrial frequency furnace is subjected to a second melting treatment, while the temperature of the industrial frequency furnace is maintained at 1000°C.

[0062] Step 2: Adjust the temperature of the industrial frequency furnace to 1050℃, transfer 3kg of slag removal agent into the industrial frequency furnace, and perform slag removal treatment on the material in the industrial frequency furnace;

[0063] The temperature of the industrial frequency furnace is adjusted to 1010℃, 3 kg of refining agent is transferred into the industrial frequency furnace, and the material in the industrial frequency furnace is refined.

[0064] Step 3: Take samples of the material in the industrial frequency furnace and perform composition testing on the samples to determine whether the composition of the samples meets the aforementioned mass percentage.

[0065] If the requirements are not met, add the corresponding materials to the industrial frequency furnace and return to step three.

[0066] If the conditions are met, the temperature of the industrial frequency furnace is adjusted to 1060℃, and the process proceeds to step four.

[0067] Step 4: The material in the industrial frequency furnace is subjected to pull casting. The initial temperature of the pull casting is 1070℃, the stable temperature is 1040℃, the speed is 90mm / min, and the temperature difference between the water cooling inlet and outlet is 18℃, resulting in a billet with a length of 205mm and a thickness of 70mm.

[0068] Step 5: The billet is subjected to hot rolling, first intermediate rolling, pass annealing, second intermediate rolling, pickling, finish rolling, and slitting to obtain the lead-brass alloy.

[0069] The hot rolling process is carried out using a 450-type two-roll mill at a rolling temperature of 800℃, resulting in a rolled length of 2500mm and a rolled thickness of 4.0mm.

[0070] The first intermediate rolling process is carried out using a 250-type two-roll mill, and the thickness after rolling is 3.7mm.

[0071] The passageway annealing process is carried out in an 80-type annealing furnace with an annealing temperature of 680℃, a heating time of 2 hours, and an annealing time of 6 hours.

[0072] The second intermediate rolling process is carried out using a 250-type two-roll mill, and the thickness after rolling is 3.15mm.

[0073] The pickling process is used to remove the surface oxide layer;

[0074] The finishing rolling process is used to correct the outer shape, and the thickness after rolling is 3.1 mm;

[0075] After the slitting process, the alloy has dimensions of 90.04mm × 90.04mm × 3.06mm, which conforms to the specification of 90mm × 90mm × 3.1mm.

[0076] This embodiment provides another application of the leaded brass alloy as described above in a floor drain.

[0077] like Figs. 1-2 As shown, in the lead-brass alloy of this embodiment, the grains are mainly island-shaped, round and full, without dendritic structure and local agglomeration. The α phase has a grain size of 25 μm, the β phase has an area percentage of 65%, the Pb phase has a grain size of 2.9 μm, the Pb phase has an area percentage of 0.4%, the intermetallic compound has a grain size of 0.3 μm, and the intermetallic compound has an area percentage of 0.05%.

[0078] The leaded brass alloy of this embodiment exhibits excellent cutting characteristics during machining, avoiding the curling and shavings common in traditional materials. The drilling produces easily manageable scrap, and the cut edges are rounded and uniform, without any chipping or powdering issues. The surface flatness is 0.04mm, the surface hardness fluctuates between 118HV5 and 121HV5, and the dimensional tolerances meet high standards (i.e., length within ±0.10, width within ±0.10, and thickness within ±0.05), ensuring seamless panel bonding in practical applications.

[0079] Example 2

[0080] This embodiment provides a leaded brass alloy comprising, by mass percentage: 59% Cu, 3.1% Pb, 0.5% Fe, and the balance being zinc and unavoidable impurity elements.

[0081] This embodiment also provides a method for preparing the lead-brass alloy as described above, the steps of which include:

[0082] Step 1: Transfer 1000kg of processed waste material to a 2.5t industrial frequency furnace, and adjust the voltage of the industrial frequency furnace to 400V to perform the first melting treatment on the processed waste material in the industrial frequency furnace;

[0083] 1000 kg of scrap copper is transferred to the industrial frequency furnace, and the material in the industrial frequency furnace is subjected to a second melting treatment, while the temperature of the industrial frequency furnace is maintained at 1010°C.

[0084] Step 2: Adjust the temperature of the industrial frequency furnace to 1030℃, transfer 3kg of slag removal agent into the industrial frequency furnace, and perform slag removal treatment on the material in the industrial frequency furnace;

[0085] The temperature of the industrial frequency furnace is adjusted to 1010℃, 3 kg of refining agent is transferred into the industrial frequency furnace, and the material in the industrial frequency furnace is refined.

[0086] Step 3: Take samples of the material in the industrial frequency furnace and perform composition testing on the samples to determine whether the composition of the samples meets the aforementioned mass percentage.

[0087] If the requirements are not met, add the corresponding materials to the industrial frequency furnace and return to step three.

[0088] If the conditions are met, the temperature of the industrial frequency furnace is adjusted to 1040℃, and the process proceeds to step four.

[0089] Step 4: The material in the industrial frequency furnace is subjected to pull casting. The initial temperature of the pull casting is 1080℃, the stable temperature is 1020℃, the speed is 90mm / min, and the temperature difference between the water cooling inlet and outlet is 15℃, resulting in a billet with a length of 275mm and a thickness of 70mm.

[0090] Step 5: The billet is subjected to hot rolling, first intermediate rolling, pass annealing, second intermediate rolling, pickling, finish rolling, and slitting to obtain the lead-brass alloy.

[0091] The hot rolling process is carried out using a 450-type two-roll mill at a rolling temperature of 850℃, resulting in a rolled length of 2500mm and a rolled thickness of 4.1mm.

[0092] The first intermediate rolling process is carried out using a 250-type two-roll mill, and the thickness after rolling is 3.7mm.

[0093] The passageway annealing process is carried out in an 80-type annealing furnace with an annealing temperature of 680℃, a heating time of 2 hours, and an annealing time of 6 hours.

[0094] The second intermediate rolling process is carried out using a 250-type two-roll mill, and the thickness after rolling is 3.15mm.

[0095] The pickling process is used to remove the surface oxide layer;

[0096] The finishing rolling process is used to correct the outer shape, and the thickness after rolling is 3.1 mm;

[0097] After the slitting and sawing process, the alloy has dimensions of 111.17mm × 111.17mm × 3.08mm, which conforms to the specification of 112mm × 112mm × 3.1mm.

[0098] This embodiment provides another application of the leaded brass alloy as described above in a floor drain.

[0099] like Figs. 3-4 As shown, in the lead-brass alloy of this embodiment, the grains are mainly island-shaped, round and full, without dendritic structure and local agglomeration. The α phase has a grain size of 20 μm, the β phase has an area percentage of 66%, the Pb phase has a grain size of 2.56 μm, the Pb phase has an area percentage of 0.2%, the intermetallic compound has a grain size of 0.4 μm, and the intermetallic compound has an area percentage of 0.03%.

[0100] The leaded brass alloy of this embodiment exhibits excellent cutting characteristics during machining, avoiding the curling and shaving phenomenon common in traditional materials. The drilling produces easily manageable scrap, and the cut edges are rounded and uniform, without any chipping or powdering issues. The surface flatness is 0.03mm, the surface hardness fluctuates between 121HV5 and 125HV5, and the dimensional tolerances meet high standards (i.e., length within ±0.10, width within ±0.10, and thickness within ±0.05), ensuring seamless panel bonding in practical applications.

[0101] Comparative Example 1

[0102] This comparative example provides a leaded brass alloy comprising, by mass percentage: 57.5% Cu, 2.9% Pb, 0.5% Fe, and the balance being zinc and unavoidable impurity elements.

[0103] This comparative example also provides a method for preparing the leaded brass alloy as described above, the steps of which include:

[0104] Step 1: Transfer 1000kg of processed waste material to a 2.5t industrial frequency furnace, and adjust the voltage of the industrial frequency furnace to 400V to perform the first melting treatment on the processed waste material in the industrial frequency furnace;

[0105] 1000 kg of scrap copper is transferred to the industrial frequency furnace, and the material in the industrial frequency furnace is subjected to a second melting treatment, while the temperature of the industrial frequency furnace is maintained at 1010°C.

[0106] Step 2: Adjust the temperature of the industrial frequency furnace to 1030℃, transfer 3kg of slag removal agent into the industrial frequency furnace, and perform slag removal treatment on the material in the industrial frequency furnace;

[0107] The temperature of the industrial frequency furnace is adjusted to 1010℃, 3 kg of refining agent is transferred into the industrial frequency furnace, and the material in the industrial frequency furnace is refined.

[0108] Step 3: Take samples of the material in the industrial frequency furnace and perform composition testing on the samples to determine whether the composition of the samples meets the aforementioned mass percentage.

[0109] If the requirements are not met, add the corresponding materials to the industrial frequency furnace and return to step three.

[0110] If the conditions are met, the temperature of the industrial frequency furnace is adjusted to 1040℃, and the process proceeds to step four.

[0111] Step 4: Perform pull casting on the material in the industrial frequency furnace. The initial temperature of the pull casting is 1080℃, the stable temperature is 1020℃, the casting speed is 70mm / min, and the temperature difference between the water cooling inlet and outlet is 25℃. The cast billet;

[0112] Step 5: The casting billet is subjected to peeling, length setting, hot pressing, sandblasting, and surface turning in sequence to obtain the leaded brass alloy.

[0113] The peeling process involves removing 1 mm of thickness from one side of the surface.

[0114] The length-cutting process is used for cutting samples according to specifications;

[0115] The hot pressing and shaping process is carried out using a 450-type press at a pressing temperature of 850℃, and the resulting dimensions are 114.5mm × 114.5mm × 5.25mm.

[0116] The particle size of the sandblasting treatment is 5mm;

[0117] After surface turning, the alloy's dimensions are 111.12mm × 111.13mm × 3.18mm, which does not conform to the specification of 112mm × 112mm × 3.1mm.

[0118] This comparative example further illustrates the application of the leaded brass alloy as described above in a floor drain.

[0119] like Figs. 5-6 As shown, the lead-brass alloy in this comparative example is mainly composed of dendrites, and island-like and short rod-like morphological features were also observed. This indicates that the grain morphology of the material is diverse, but the dendritic structure is dominant. The grain size of the α phase cannot be rated, the area percentage of the β phase is 52%, the grain size of the Pb phase is 6.5 μm and the area percentage of the Pb phase is 0.6%, the grain size of the intermetallic compound is 0.8 μm and the area percentage of the intermetallic compound is 0.002%.

[0120] The leaded brass alloy in this embodiment has poor machinability during machining, exhibits localized curling, partial cracking at the cut edges, localized missing pieces and powdering, a surface flatness of 0.1mm, surface hardness fluctuations between 104HV5 and 141HV5, and dimensional tolerances that do not meet requirements (i.e., length within ±0.10, width within ±0.10, and thickness within ±0.05). In practical applications, there is obvious warping between the panels.

[0121] In summary, the leaded brass alloy of this invention exhibits excellent cutting characteristics during machining, avoiding the curling and shaving phenomena common in traditional materials. The drilling produces easily manageable scrap, and the cut edges are rounded and uniform, without any chipping or powdering issues. The surface flatness is below 0.05mm, the surface hardness fluctuation is within 5%, the length is within ±0.10, the width is within ±0.10, and the thickness is within ±0.05, significantly improving the production quality and efficiency of floor drains.

[0122] The above description is merely a preferred embodiment of the present invention and does not limit the implementation and protection scope of the present invention. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present invention should be included within the protection scope of the present invention.

Claims

1. A lead brass alloy characterized in that, comprising: Cu, Pb, and the balance of Zn and inevitable impurity elements; and, 56.0% < m Cu ≤ 59.0%, 2.2% < m Pb ≤ 3.2%; wherein m Cu represents the mass percentage of the Cu in the lead brass alloy, m Pb represents the mass percentage of the Pb in the lead brass alloy; and, the lead brass alloy comprises: a matrix phase and a second phase; the matrix phase comprises: an α phase and a β phase, the second phase comprises: a γ phase, a Pb phase, and an intermetallic compound; the intermetallic compound comprises: at least one of FeAlCe, Fe3B, AlB2, FeNiB, or AlZrEr; wherein, the area percentage of the β phase is 64%-68%, the area percentage of the Pb phase is 0.1%-0.5%, and the area percentage of the intermetallic compound is 0.01%-0.1%.

2. The lead brass alloy according to claim 1, characterized in that, Further comprising: Fe; and, m Fe ≤ 0.7%； wherein m Fe represents the mass percentage of Fe in the lead brass alloy.

3. The lead brass alloy of claim 1, wherein the particle size of the α phase is 20 μm-35 μm.

4. The lead brass alloy of claim 1, wherein the particle size of the Pb phase is 1 μm-5 μm.

5. The lead brass alloy of claim 1, wherein the particle size of the intermetallic compound is 0.1 μm-1.0 μm.

6. A method of producing a lead brass alloy as claimed in any one of claims 1 to 5, characterized in that the steps comprising: subjecting raw materials to melting treatment and directional casting in sequence to obtain a cast blank; subjecting the cast blank to hot rolling treatment, first intermediate rolling treatment, annealing treatment, second intermediate rolling treatment, pickling treatment, and finish rolling treatment in sequence to obtain the lead brass alloy.

7. The method of claim 6, wherein step comprising: Step one, subjecting the processed return material to first melting treatment; adding scrap copper and subjecting the material to second melting treatment; Step two, adding slag remover and subjecting the material to slag removal treatment; adding refiner and subjecting the material to refining treatment; Step three, sampling the material and testing the composition of the sampled sample to determine whether the composition of the sample meets: 56.0% < m Cu ≤ 59.0%, 2.2% < m Pb ≤ 3.2%; if not, supplementing the corresponding material and returning to the step three; if yes, proceeding to step four; Step four, subjecting the material to directional casting to obtain the cast blank; Step five, subjecting the cast blank to the hot rolling treatment, the first intermediate rolling treatment, the annealing treatment, the second intermediate rolling treatment, the pickling treatment, and the finish rolling treatment in sequence to obtain the lead brass alloy.

8. The preparation method according to claim 7, characterized in that, the voltage of the first melting treatment is 300V-500V; the temperature of the second melting treatment is 980℃-1020℃.

9. The preparation method according to claim 7, characterized in that, the temperature of the slag removal treatment is 1030℃-1050℃; the temperature of the refining treatment is 1010℃-1040℃.

10. The production method according to claim 6 or 7, characterized by, the initial temperature of the directional casting is 1060℃-1180℃, the stable temperature is 1000℃-1040℃, the speed is 80mm / min-120mm / min, and the temperature difference between the water inlet and the water outlet of water cooling is 15℃-20℃.

11. The production method according to claim 6 or 7, characterized by, the rolling temperature of the hot rolling treatment is 750℃-850℃; the annealing temperature of the annealing treatment is 620℃-680℃, the heating time is 1h-3h, and the annealing time is 5h-7h.

12. The lead brass alloy of any one of claims 1-5 or prepared by the method of any one of claims 6-11 for use in a floor drain.

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