3000 series aluminum sheet plate alloy metal

SAYA. Material Science Fundamentals and Alloy Positioning

1.1 Alloy Classification and Strengthening Mechanisms

Itu 3000 series aluminum alloy belongs to the Aluminum-Manganese (Al-Mn) sistem​ and is classified as a non-heat-treatable aluminum alloy​ in international alloy designation systems. Its core strengthening mechanisms rely on penguatan larutan padat​ dan pengerasan tegang (work hardening).

In this series, mangan (M N) serves as the primary alloying element. Its atomic radius is larger than that of aluminum (Al). When Mn atoms dissolve into the face-centered cubic lattice of the aluminum matrix, they cause lattice distortion. This distortion not only hinders dislocation movement, thereby significantly increasing the yield strength and tensile strength at room temperature, but also further improves the overall mechanical properties of the material by refining the grain structure.

1.2 Core Physical and Chemical Properties

• Kepadatan: Sekitar 2.73 gram/cm³ (sedikit lebih tinggi dari 2.70 g/cm³ for pure aluminum).
• Rentang Peleburan: Approximately 643°C – 654°C.
• Konduktivitas Termal: Sekitar 192 Dengan/(m·K), performing well in heat dissipation applications.
• Electrochemical Properties: Since the standard electrode potential of manganese (-1.18V) is relatively close to that of aluminum (-1.66V), the solid solution formed between them does not produce a significant potential difference during electrochemical corrosion. This gives 3000 series aluminum alloys excellent microstructural resistance to localized corrosion (such as pitting and crevice corrosion).

II. In-Depth Analysis of Core Grades and Parameter Comparison

Itu 3000 series includes several derivative grades. Their performance differences are primarily determined by the proportioning of trace elements (seperti magnesium, tembaga, dan silikon). The following is an in-depth analysis of mainstream grades and detailed parameter comparisons.

2.1 Comparison of Key Grade Characteristics

2.2 Detailed Mechanical Property Parameter Comparison Table

Catatan: The following data are typical values; actual performance is affected by processing technology and heat treatment condition.

AKU AKU AKU. Microstructure and Work Hardening Behavior

3.1 Work Hardening Exponent (nilai-n) and Plastic Strain Ratio (r-value)

Two core material parameters are crucial when evaluating the forming limit of 3000 paduan aluminium seri:

• Work Hardening Exponent (nilai-n): 3000 seri (especially 3003-O) exhibits a relatively high n-value, meaning that as plastic deformation increases, the local tensile strength of the material rises rapidly. This characteristic effectively prevents “leher” during stretching and is key to achieving extreme deep drawing.
• Plastic Strain Ratio (r-value): Represents the material’s ability to resist deformation in the thickness direction. The r-value of 3003 aluminum alloy is typically greater than 1, indicating that its deformation capacity within the plane is superior to its thinning capacity in the thickness direction. This is crucial for manufacturing complex stamped parts that do not fracture (such as the bottom arc of cookware).

3.2 Anisotropy and Its Impact

Karena butiran memanjang sepanjang arah penggulungan selama proses penggulungan dan membentuk tekstur, 3000 pelat aluminium seri menunjukkan anisotropi yang jelas. Selama pemrosesan mendalam (seperti tes bekam), anisotropi ini menyebabkan ketinggian yang tidak rata pada tepi benda kerja, umumnya dikenal sebagai “subang.”

• Metode Pengendalian: Dengan mengatur parameter proses pengerolan panas sebelum pengerolan dingin (seperti suhu akhir) dan proses anil menengah, tekstur kristalisasi dapat dilemahkan secara efektif, mengendalikan tingkat perolehan dalam 3%~5%, sehingga mengurangi sisa stempel dan meningkatkan tingkat hasil.

IV. Proses Produksi Inti dan Kontrol Struktur Mikro

4.1 Pengecoran dan Homogenisasi Annealing

• Pengecoran Dingin Langsung (DC): Digunakan untuk menghasilkan billet canai panas berkualitas tinggi. Setelah casting, anil homogenisasi suhu tinggi harus dilakukan (biasanya antara 560°C-620°C) untuk menghilangkan segregasi dendritik, membulatkan fase non-ekuilibrium (seperti Al₆Mn), dan mendistribusikannya secara merata untuk mencegah struktur terikat selama penggulungan berikutnya.
• Pengecoran Berkelanjutan (CC): Logam cair langsung membeku menjadi blanko berukuran 6-10 mm di antara rol berpendingin air. Metode ini mempunyai laju pendinginan yang sangat cepat (hingga puluhan °C/detik), menghasilkan senyawa intermetalik yang sangat halus, tetapi ia mengalami tekanan internal dan segregasi komposisi yang signifikan. Ini sebagian besar digunakan untuk pelat umum dengan persyaratan lebih rendah untuk penyelesaian permukaan dan gambar dalam.

4.2 Penggulungan Dingin dan Anil Menengah

Total tingkat pengurangan pengerolan dingin untuk 3000 paduan seri biasanya dapat mencapai 70%-90%. Jika anil menengah (MISALNYA., 300°C-400 °C) dilakukan selama pengerolan dingin multi-pass, bahan yang dikeraskan dengan kerja dapat mengkristal kembali, memulihkan plastisitas dan nilai-n. Hal ini sangat penting terutama untuk material deep-drawing yang memerlukan deformasi signifikan (seperti stok kaleng).

V. Pengolahan, Pembentukan, dan Pedoman Bergabung

5.1 Pembentukan Rekomendasi Parameter Proses

5.2 Spesifikasi Proses Pengelasan

3000 paduan aluminium seri memiliki kemampuan las yang baik dan tidak mudah retak panas.

• Pengelasan TIG (Pengelasan Busur Tungsten Gas): Catu daya AC direkomendasikan. Filler wire should be selected to match the base metal composition, such as ER3003 or ER4043 (higher silicon content, fluiditas yang baik, strong crack resistance). Oxide films on the groove and both sides must be thoroughly removed before welding (stainless steel wire brushes can be used).
• MIG Welding (Gas Metal Arc Welding): Suitable for automated welding of medium-thick plates. Due to the high thermal conductivity of aluminum, preheating (60°C-100°C) is required for thick plates (>6mm).
• Pengelasan Resistansi (Spot Welding/Seam Welding): The surface has a high-resistance oxide film that needs to be “blasted” clean via high current under electrode pressure. Copper alloy electrodes with spherical ends are recommended, applying higher electrode pressure (increase by 30%-50% compared to steel).

VI. Common Production Defects and Failure Analysis

During actual processing and usage, 3000 series aluminum plates may encounter the following issues and solutions:

1. Stretcher Strains / Lüders Lines
   • Phenomenon: Visible rough diagonal lines appear on the sheet surface after shallow drawing or bending.
   • Menyebabkan: The material developed Lüders bands during skin pass rolling with a small reduction.
   • Larutan: Select pre-stretched plates, or perform 1%-2% micro-cold rolling (secondary cold rolling) before stamping to eliminate the yield point plateau.
2. Kulit jeruk
   • Phenomenon: The surface of the deep-drawn part exhibits a rough texture similar to an orange peel.
   • Menyebabkan: Raw material grains are too coarse, or secondary phase particles are unevenly distributed, leading to uncoordinated deformation.
   • Larutan: Require the supplier to provide fine-grained materials (ASTM 1-3 nilai) and control the stamping deformation within a reasonable range.
3. Retak Korosi Stres (SCC)
   • Phenomenon: Brittle fracture under the combined action of tensile stress and specific corrosive media.
   • Menyebabkan: Residual stress after cold working was not eliminated.
   • Larutan: Perform low-temperature stress relief annealing on cold-worked parts (120°C-150°C, holding for 1-2 jam).

VII. Surface Treatment and Anti-Corrosion Technology

7.1 Perawatan Konversi Kimia (Chromating / Pasifasi)

Before painting, 3000 series aluminum plates usually require chromate or chrome-free passivation processes to generate a nanoscale conversion film. This film not only improves the bonding force between the substrate and organic coatings (such as PVDF fluorocarbon paint) to reach standard level 0 but also acts as a barrier to cathodic phases, slowing down galvanic corrosion.

7.2 Anodisasi

Meskipun 3000 series does not produce uniform, high-gloss anodic films as easily as the 1000 atau 6000 seri, through special electrolyte formulations (such as sulfuric acid solutions with added organic acids) and AC/DC superimposed power supplies, 3004 alloys can also be used to manufacture wear-resistant, insulating oxide coatings, typically controlled at 5-20μm thickness.

VIII. Sustainable Development and Frontier Application Trends

8.1 Closed-Loop Recycling and Life Cycle Assessment (LCA)

3000 series aluminum alloys have excellent recycling regenerability. When scrapped 3000 series aluminum is remelted, its inherent alloying elements (especially manganese) not only do not burn off but also act as deoxidizers and alloying agents. Compared to primary aluminum production, using scrap aluminum for remelting can reduce energy consumption by up to 95%, membuat 3000 series a benchmark material for practicing “carbon neutrality” sasaran.

8.2 New Energy Vehicles and Battery Technology

With the increase in power battery energy density, requirements for heat dissipation and safety of battery casings are becoming increasingly stringent. Leveraging its good thermal conductivity, kekuatan sedang, and mature deep-drawing process, 3003 aluminum alloy is gradually replacing some traditional steels to become the mainstream material for square power battery shells and liquid cooling thermal management systems.

8.3 High-Performance Clad Aluminum Plates

Through composite rolling technology, 3003 aluminum alloy is used as the core layer, clad on both sides with pure aluminum (1070) or zinc sacrificial anode material to create three-layer composite plates. This material demonstrates excellent electrochemical protection performance and structural strength in seawater desalination equipment and specialized chemical storage tanks.

IX. Pertanyaan yang Sering Diajukan (Pertanyaan Umum)

Q1: How do I choose between 3003 Dan 3004 lembaran aluminium?

• A: It mainly depends on strength and application. If you are making stamped parts, tangki bahan bakar, or cookware​ that do not require high mechanical strength, memilih 3003​ (kinerja biaya tinggi, sifat mampu bentuk yang sangat baik). If you need to make fasad bangunan, beverage cans, or structural parts that need to withstand certain pressures, memilih 3004​ (contains magnesium, kekuatan yang lebih tinggi, better wind pressure resistance).

Q2: Why did my 3003 aluminum plate crack after bending?

• A: Usually caused by three reasons: ① Wrong temper selected: If you bought H18 (full hard temper), the elongation is very low, and forced bending will inevitably cause cracking. Switch to H14 or O temper. ② Grain direction: Aluminum plates have a rolling direction; bending perpendicular to the rolling direction is prone to cracking. Try to bend parallel to the grain. ③ Excessive impurities: Inferior aluminum plates may contain too many impurities causing increased brittleness.

Q3: Bisa 3000 series aluminum plates be used in seawater?

• A: Tidak disarankan untuk perendaman jangka panjang. Meskipun 3000 seri lebih tahan korosi dibandingkan 1000 seri, ketahanan korosinya jauh lebih rendah 5000 seri (Al-mg) paduan di lingkungan air laut yang kaya ion klorida. Jika perlu, berat pelapis epoksi​ atau perlindungan anoda korbanharus diterapkan.

Q4: Terdapat banyak minyak pada permukaan pelat alumunium. Apakah saya perlu membersihkannya sebelum digunakan?

• A: Pembersihan adalah wajib. Minyak linting dan minyak stamping, jika tidak dihilangkan, akan menyebabkan porositas pengelasan, lapisan terkelupas, atau noda anodisasi. Disarankan untuk menggunakan yang berdedikasi pembersih aluminium​ atau aseton untuk menyeka. Avoid using strong alkaline cleaners to prevent surface corrosion.

Q5: How to quickly distinguish between 3003 Dan 5052 pelat aluminium?

• A: The most intuitive method is kekerasan. 5052-H32 is usually very hard and difficult to bend by hand, with significant springback; 3003-H14 is relatively softer and shows obvious plastic deformation under force, with smaller springback. Selain itu, 5052 produces fewer sparks that are dark red when grinding, ketika 3003 sparks are relatively bright white (for auxiliary judgment only; precise distinction requires spectral analysis).