High-manganese low-magnesium aluminum alloy blank and hot rolling and vibration aging process thereof

Abstract

The invention provides a high-manganese low-magnesium aluminum alloy blank and a hot rolling and vibration aging process thereof. The blank comprises the following chemical components in percentage by mass: Mngt; 1.5% of Al, less than or equal to 0.2% of Mg, less than or equal to 1.7% of Si, less than or equal to 0.7% of Fe, less than or equal to 0.5% of Ni, less than or equal to 1.0% of Sn and the balance Al and inevitable According to the hot rolling and vibration aging process, an aluminum alloy ingot is heated to 550 DEG C, heat preservation is conducted according to the time of 2 min / mm, then the aluminum alloy ingot is taken out of a furnace, hot rolling is conducted, rolling is conducted in two sections, the rolling reduction rate of the first section is larger than or equal to 20%, the rolling reduction rate of each pass is adjusted to be smaller than or equal to 10% when the aluminum alloy ingot is rolled to be smaller than half of the thickness, second-section rolling continues, the final rolling temperature is larger than or equal to 400 DEG C, and a blank is prepared through shearing and trimming; and the rolled blank is subjected to vibration aging through a vibration bed within 12 hours, the vibration time is larger than or equal to 30 min, and the vibration frequency is larger than or equal to 75 Hz. The tensile strength of the aluminum alloy blank can reach 180 MPa or above, the elongation can reach 10% or above, and the product of strength and elongation is larger than or equal to 2 GPa.%. The method has the outstanding advantages that the rolled blank is excellent in comprehensive performance, low in internal stress and good in corrosion resistance, and annealing-free treatment can be used by downstream customers.

Description

Technical Field

[0001] The invention belongs to the field of nonferrous metal materials and relates to a high-manganese and low-magnesium aluminum alloy billet and a hot rolling and vibration aging process thereof. Background Art

[0002] As we all know, aluminum-plastic panels are made of multiple layers of materials. The upper and lower layers are high-quality aluminum alloy strips, and the middle layer is a non-toxic low-density polyethylene core board. It is a composite material processed on special aluminum-plastic panel production equipment. Aluminum-plastic panels are composed of metals and non-metals with completely different properties. They not only retain the main characteristics of aluminum alloys and polyethylene plastics, but also overcome the shortcomings of the original component materials, thereby obtaining excellent comprehensive characteristics; specifically, they include decorative properties, weather resistance, corrosion resistance, fire resistance, moisture resistance, sound insulation, heat insulation, and earthquake resistance; they are light in weight, easy to process and shape, and easy to carry and install. Since the early 1990s, aluminum-plastic panels have been widely used in various construction projects, such as counters, furniture, elevators, billboards, factories, etc.

[0003] In fact, the aluminum-plastic panel cleverly utilizes the mechanical principles of I-beams to give it unique mechanical properties. In addition, the upper and lower layers of aluminum strips are under a certain tension during the production process. After forming and cooling, the difference in shrinkage between the aluminum strip and the polyethylene core board causes the material to produce greater internal stress and stiffness.

[0004] Aluminum-plastic plate metal strip is made of aluminum alloy billets with high strength and plasticity. Due to the large internal stress in hot rolling, annealing heat treatment is often used to eliminate it. It is well known that although annealing heat treatment obtains higher plasticity, its strength decreases. Since the annealing treatment cycle is long and consumes a lot of energy. In order to solve this technical problem, vibration aging treatment is used after hot rolling. Under the condition of ensuring the strength of the aluminum alloy billet, the plasticity is significantly improved. Compared with annealing treatment, vibration aging only takes more than 30 minutes to complete the stress elimination treatment, which can save more than 90% of energy and save the huge investment in building a large annealing furnace.

[0005] This patent discloses a high-manganese and low-magnesium aluminum alloy billet and its hot rolling and vibration aging process, and mainly prepares aluminum alloy billets with good ductility through hot rolling and vibration aging process technology. Summary of the invention

[0006] In view of this, the present invention provides a high-manganese and low-magnesium aluminum alloy billet and a hot rolling and vibration aging process thereof.

[0007] The invention provides a high-manganese and low-magnesium aluminum alloy billet, the chemical composition and mass percentage of which are: Mn>1.5%, Mg≤0.2%, Si≤1.7%, Fe≤0.7%, Ni≤0.5%, Sn≤1.0%, and the balance is Al and inevitable impurities.

[0008] The present invention also provides a high-manganese and low-magnesium aluminum alloy billet with simple process steps and hot rolling and vibration aging process thereof, comprising the following steps:

[0009] (1) Heating: placing an aluminum alloy ingot having a chemical composition of Mn>1.5%, Mg≤0.2%, Si≤1.7%, Fe≤0.7%, Ni≤0.5%, Sn≤1.0%, and the balance being Al and unavoidable impurities into a heating furnace and heating it to 550° C., and keeping it warm for 2 min / mm;

[0010] (2) Hot rolling: After being taken out of the furnace, hot rolling is started, which is divided into two stages. The first stage has a rolling reduction ratio of ≥20%. When the rolling reduction ratio is less than half of the thickness, the rolling reduction ratio is adjusted to ≤10% and the second stage rolling is continued. The billet is prepared by shearing and trimming.

[0011] (3) Vibration: The rolled billet is passed through a vibrating bed within 12 hours to eliminate the rolling internal stress. The vibration time is ≥30 min and the vibration frequency is ≥75 Hz.

[0012] The aluminum alloy blank provided by the invention has a tensile strength of more than 180 MPa, an elongation of more than 10%, and a strength-ductility product of ≥2 GPa·%. The blank rolled by the method has excellent comprehensive performance, low internal stress, and good corrosion resistance, and can be used by downstream customers without annealing treatment. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the embodiments.

[0014] Example 1

[0015] A high manganese and low magnesium aluminum alloy billet and a hot rolling and vibration aging process thereof, comprising the following steps:

[0016] (1) Heating: placing an aluminum alloy ingot having a chemical composition of Mn 1.6%, Mg 0.17%, Si 0.9%, Fe 0.31%, Ni 0.17%, Sn 0.3%, and the balance Al and unavoidable impurities in a heating furnace, heating it to 550° C., and keeping it warm for 2 min / mm;

[0017] (2) Hot rolling: After being taken out of the furnace, hot rolling is started. The rolling is divided into two stages. The rolling reduction ratios of each pass in the first stage are 20%, 20%, and 22% respectively. When the rolling reduction ratios are less than half of the thickness, the rolling reduction ratios of each pass are adjusted to 9%, 8%, 7%, and 6% respectively. The second stage rolling is continued. The final rolling temperature is 460°C. The billet is prepared by shearing and trimming.

[0018] (3) Vibration: The rolled billet is passed through a vibrating bed within 12 hours to eliminate rolling internal stress. The vibration time is 39 minutes and the vibration frequency is 79 Hz.

[0019] The rolling reduction per rolling pass is shown in Table 1, and the billet mechanical properties test results are shown in Table 3.

[0020] Table 1

[0021]

[0022] Example 2

[0023] A high manganese and low magnesium aluminum alloy billet and a hot rolling and vibration aging process thereof, comprising the following steps:

[0024] (1) Heating: placing an aluminum alloy ingot having a chemical composition of Mn 1.61%, Mg 0.18%, Si 0.8%, Fe 0.3%, Ni 0.18%, Sn 0.3%, and the balance Al and unavoidable impurities in a heating furnace, heating it to 550° C., and keeping it warm for 2 min / mm;

[0025] (2) Hot rolling: After being taken out of the furnace, hot rolling is started, which is divided into two stages. The first stage rolling reduction ratio is 20%, 21%, and 21% respectively. When the rolling reduction ratio is less than half of the thickness, the rolling reduction ratio of each pass is adjusted to 9%, 8%, 8%, and 7% in sequence. The second stage rolling is continued. The final rolling temperature is 479°C. The billet is prepared by shearing and trimming.

[0026] (3) Vibration: The rolled billet is passed through a vibrating bed within 12 hours to eliminate the rolling internal stress. The vibration time is 37 minutes and the vibration frequency is 76 Hz.

[0027] The rolling reduction per rolling pass is shown in Table 2, and the billet mechanical properties test results are shown in Table 3.

[0028] Table 2

[0029]

[0030] Table 3

[0031]

Claims

1. A high manganese and low magnesium aluminum alloy billet, characterized in that: The chemical composition and mass percentage of the blank are: Mn>1.5%, Mg≤0.2%, Si≤1.7%, Fe≤0.7%, Ni≤0.5%, Sn≤1.0%, and the balance is Al and unavoidable impurities.

2. A hot rolling process for a high manganese and low magnesium aluminum alloy billet as claimed in claim 1, characterized in that: The aluminum alloy ingot is heated to 550°C and kept warm for a period of time, then kept warm for 2 min / mm, taken out of the furnace and hot rolled. The rolling is divided into two stages, wherein the first stage has a rolling reduction rate of ≥20% per pass, and when the rolling is less than half of the thickness, the rolling reduction rate per pass is adjusted to ≤10% and the second stage rolling is continued. The final rolling temperature is ≥400°C, and the billet is prepared by shearing and trimming.

3. A vibration aging process for a high manganese and low magnesium aluminum alloy billet as claimed in claim 1, characterized in that: Within 12 hours, the rolled billet is passed through a vibrating bed to eliminate the rolling internal stress, the vibration time is ≥30min, and the vibration frequency is ≥75Hz.

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