Cc Cold Rol Semi-hard Aluminum Strip
The CC Cold Rol Semi-hard Aluminum Strip is a premium-grade aluminum product manufactured through Cold Rolling (Cold Rol) and deposited in a semi-hard, or “H” temper state. This strip provides an excellent combination of strength, ductility, corrosion resistance, and surface finish — making it the ideal choice across multiple industries including packaging, automotive, electronics, and household goods.
Cold Rol aluminum strips essentially undergo iterative rolling processes at ambient temperatures, significantly enhancing mechanical properties through strain hardening without the need for heat treatment.
| Property | Description |
|---|---|
| Product Name | CC Cold Rol Semi-hard Aluminum Strip |
| Alloy Grade | Various, commonly 1060, 3003, 5052 |
| Temper | H14 / H16 (Semi-hard) |
| Thickness Range | 0.2 mm – 3.0 mm |
| Width Range | 10 mm – 300 mm |
| Surface Finish | Bright / Mill Finish / Smooth |
| Coil Weight | Up to 5 metric tons (custom available) |
Chemical Composition
Aluminum strips are produced in various alloy series according to their chemical constituents affecting their mechanical and corrosion properties. Below are common alloy compositions (wt.%):
Working with CC (continuous casting) cold rolled semi-hard aluminum strip presents a unique set of challenges compared to other temper grades. The semi-hard temper (typically H18 or similar) offers a good balance of strength and ductility, making it suitable for a wide range of applications, from automotive parts to building construction. However, achieving consistent properties throughout the coil is crucial. We often see minor variations in hardness across the coil width, attributed to subtle inconsistencies in the cooling process during continuous casting or slight variations in rolling parameters. This requires meticulous monitoring of both the casting and rolling processes, including precise control of temperature profiles and roll pressures, to minimize these variations and ensure consistent product quality for our customers. Careful attention to surface finish is also paramount, as any defects can significantly impact the final product's aesthetics and functionality, especially in applications requiring further processing.
Furthermore, the springback characteristics of semi-hard aluminum strip is vital for precise forming operations downstream. The inherent resilience of this temper means that components formed from it will exhibit a degree of springback after being bent or otherwise shaped. Accurate prediction and compensation for this springback are critical to achieving the desired final dimensions. We often employ advanced modeling techniques and rigorous testing to determine the optimal forming parameters for each specific application. This requires close collaboration with our clients to fully understand their processes and assist them in achieving optimal performance with our semi-hard aluminum strip, thereby minimizing waste and maximizing their manufacturing efficiency
| Element | 1060 | 3003 | 5052 |
|---|---|---|---|
| Aluminum (Al) | Min 99.6% | Balance (~96.8%) | Balance (~97.25%) |
| Si (Silicon) | ≤ 0.25 | 0.30 – 0.60 | ≤ 0.25 |
| Fe (Iron) | ≤ 0.35 | 0.7 – 1.2 | ≤ 0.40 |
| Cu (Copper) | ≤ 0.05 | ≤ 0.10 | ≤ 0.10 |
| Mn (Manganese) | ≤ 0.03 | 1.0 – 1.5 | ≤ 0.10 |
| Mg (Magnesium) | ≤ 0.03 | ≤ 0.10 | 2.2 – 2.8 |
| Zn (Zinc) | ≤ 0.10 | ≤ 0.10 | ≤ 0.10 |
| Cr (Chromium) | ≤ 0.01 | ≤ 0.10 | 0.15 – 0.35 |
| Others | ≤ 0.03 | Trace | Trace |
Tempering & Mechanical Properties
“Semi-hard” temper typically relates to hardness and strength balancing between fully annealed (O temper) and hard tempers, achievable mostly via cold rolling strain hardening. The designation H14 or H16 corresponds to temper in common specifications and typically defines:
- H14 — 75% of full hard rolling, characterized by good drawing and deformation capabilities.
- H16 — 80% cold rolling hardness, offering higher strength but less formability than H14.
| Parameter | H14 Temper | H16 Temper |
|---|---|---|
| Tensile Strength | 95 – 130 MPa | 130 – 170 MPa |
| Yield Strength | 50 – 90 MPa | 90 – 135 MPa |
| Elongation (%) | 3 – 10 | 2 – 7 |
| Hardness (MPa) | Increased from annealed, varies by alloy |
The semi-hard temper strain hardening process also enhances durability while retaining ample flexibility for shaping processes like bending, pressing, or drawing.
Manufacturing Process
- Casting: Alloy bars or billets are cast based on standardized alloys.
- Hot Rolling: Billets are rolled at elevated temperature to reduce thickness initially.
- Annealing: Achieves an appropriate soft temper (O) for subsequent processes.
- Cold Rolling: Multiple incremental passes reduce the thickness further while increasing material strength, eventually reaching H14 / H16 tempers.
- Slitting & Cutting: Custom widths and lengths package the final product.
- Surface Treatment: Requests involve polishing, brushing, or protective lamination depending on the customer requirements.
Implementation Standards
Our CC Cold Rol Semi-hard Aluminum Strips conform to international and industry production standards, including but not limited to:
- ASTM B209 – Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate
- EN 485-2 – Aluminum and Aluminium Alloys - Sheet, strip and plate – Mechanical properties
- JIS H4000 – Japanese Standard on Aluminum Alloy Sheets and Plates
- GB/T 3880 – Chinese National Standard for Aluminum and Aluminum Alloys
Each batch undergoes rigorous quality testing for dimensional accuracy, surface defects, mechanical quality, and corrosion resistance following these norms.
Applications
Thanks to its enhanced strength and toughness against bending fatigue, semi-hard copper-critical cold rolled aluminum strip enjoys extensive use in-line with these industries:
- Electrical components requiring lightweight & conductivity
- Automotive internal parts & decorative panels
- HVAC equipment casings and components
- Food and chemical container components (braises, interiors)
- Packaging requiring sturdy yet ductile base material
Packaging & Delivery
The aluminum strips are tightly coiled, secured, and labeled, then packaged on pallets within moisture- and dust-resistant wrappings suitable for transit. Typical coil weight ranges from 500 kg to 5,000 kg, depending on quantity and thickness. We accommodate special packaging or protective coatings as per client requirements.
Ordering & Technical Support
Customers seeking consultation for alloy choice, customization on temper or size, and performance testing are encouraged to contact our technical support team. Our experts provide tailored material selections to guarantee optimal performance in clients’ individual manufacturing operations.
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