Mill Finished Hot Cold Rol Aluminium Coil
Mill Finished Hot Cold Rol Aluminium Coil is a versatile aluminum product supplied directly from the rolling mill without additional surface coating, polishing, or anodizing. It is widely used in construction, transportation, insulation, electrical equipment, and general fabrication because it combines light weight, corrosion resistance, good formability, and cost efficiency.
For buyers and engineers, mill finish aluminum coil is valued for its clean metallic appearance and its suitability for further processing such as slitting, stamping, bending, roll forming, and surface treatment. Whether produced through hot rolling or cold rolling, the coil can be tailored in different alloys, tempers, widths, and thicknesses to meet a broad range of industrial requirements.
What Is Mill Finished Hot Cold Rol Aluminium Coil?
Mill finish refers to the natural surface condition of aluminum after rolling and annealing, with no extra decorative or protective coating added. The surface may show slight rolling marks, minor tonal variations, or processing lines, which are normal for mill-finished material.
Hot rolled aluminum coil is generally produced from cast slabs at elevated temperature. It offers better internal structure, improved ductility, and is often used as the base material for further cold rolling.
Cold rolled aluminum coil is processed further at room temperature to achieve tighter thickness tolerance, smoother surface, and improved mechanical properties. In practice, many finished coils have gone through both hot and cold rolling stages.
Main Functions of Mill Finished Aluminium Coil
Mill finished hot cold rolled aluminum coil performs several important functions across industries:
| Function | Description |
|---|---|
| Structural support | Provides lightweight strength for panels, covers, casings, and fabricated parts |
| Corrosion resistance | Natural oxide film helps resist moisture, atmosphere, and many chemicals |
| Heat reflection | Bright metallic surface offers good thermal and light reflectivity |
| Formability | Suitable for bending, deep drawing, stamping, spinning, and roll forming |
| Conductivity | Good electrical and thermal conductivity for industrial and electrical uses |
| Processing substrate | Ideal base material for coating, anodizing, embossing, perforating, and laminating |
Hot Rolled vs Cold Rolled Aluminium Coil
Both production routes are important, but they serve slightly different purposes.
| Item | Hot Rolled Aluminium Coil | Cold Rolled Aluminium Coil |
|---|---|---|
| Processing temperature | Rolled at elevated temperature | Rolled at room temperature |
| Surface condition | Relatively rougher | Smoother and more uniform |
| Thickness capability | Suitable for thicker gauges | Better for thinner precision gauges |
| Mechanical structure | Better internal grain refinement from hot working | Higher strength after work hardening |
| Tolerance | Moderate | More precise |
| Common use | Base stock, heavy gauge applications | Finishing stock, appliance, roofing, closure, sheet fabrication |
Common Applications
Mill finished aluminum coil is used in a very wide range of sectors because it is easy to fabricate and economical.
| Industry | Typical Applications |
|---|---|
| Building and construction | Roofing sheets, gutters, curtain wall backing, insulation jacketing, ceilings |
| Transportation | Trailer panels, body sheets, heat shields, fuel tank parts |
| HVAC and insulation | Pipe jacketing, duct cladding, insulation covers |
| Electrical | Cable wrap, bus components, transformer strips, electrical housings |
| Packaging and closures | Bottle caps, closure stock, can components |
| Household and appliance | Cookware parts, refrigerator panels, washing machine parts |
| General manufacturing | Stamping parts, signs, lighting components, machine covers |
Common Alloys and Temper Conditions
The alloy and temper determine strength, corrosion resistance, and forming performance. The most common alloys for mill finished coils belong to the 1xxx, 3xxx, 5xxx, and 8xxx series.
| Alloy | Main Characteristics | Common Tempers | Typical Uses |
|---|---|---|---|
| 1050 | Very high purity, excellent corrosion resistance, high conductivity | O, H14, H24 | Insulation, reflectors, chemical equipment |
| 1060 | High aluminum content, good formability | O, H18, H24 | Electrical, signage, general sheet metal |
| 1100 | Soft, workable, corrosion resistant | O, H14, H16 | Decorative parts, utensils, chemical handling |
| 3003 | Mn alloy, good strength and formability | O, H14, H24 | Roofing, cladding, insulation jacketing |
| 3004 | Higher strength than 3003 | H14, H16, H24 | Containers, building materials |
| 3105 | Good corrosion resistance and moderate strength | H14, H24, H26 | Roofing, siding, closures |
| 5005 | Better appearance after anodizing, good corrosion resistance | H14, H24, H34 | Architectural panels |
| 5052 | Higher strength, excellent marine corrosion resistance | O, H32, H34 | Tanks, transport, industrial parts |
| 8011 | Good formability and practical utility | O, H14, H18 | Caps, packaging, insulation |
Typical Temper Meanings
| Temper | Meaning |
|---|---|
| O | Annealed, soft condition with maximum ductility |
| H14 | Strain hardened to half-hard |
| H16 | Strain hardened to three-quarter hard |
| H18 | Strain hardened to full hard |
| H24 | Strain hardened and partially annealed, half-hard |
| H32 | Strain hardened and stabilized |
| H34 | Strain hardened and stabilized to higher strength |
Technical Specifications
The actual supply range depends on alloy, mill capability, and end use, but the following parameters are common.
| Parameter | Typical Range |
|---|---|
| Thickness | 0.2 mm – 10.0 mm |
| Width | 20 mm – 2650 mm |
| Coil inner diameter | 150 mm, 300 mm, 405 mm, 505 mm, 508 mm |
| Coil outer diameter | Up to customer requirement |
| Coil weight | 1 ton – 8 tons or customized |
| Surface | Mill finish |
| Edge | Mill edge or slit edge |
| Rolling type | Hot rolled, cold rolled, hot rolled + cold rolled |
| Flatness | Industrial standard, depending on temper and thickness |
| Thickness tolerance | According to EN, ASTM, GB, or customer agreement |
Implementation Standards
Mill finished aluminum coil can be manufactured and inspected according to major international standards.
| Standard System | Common Standards |
|---|---|
| ASTM | ASTM B209 |
| EN | EN 485, EN 573, EN 515 |
| GB/T | GB/T 3880 |
| JIS | JIS H4000 |
| AMS | Available for selected aerospace-grade materials |
Typical Mechanical Properties
The values below are representative only. Actual properties vary by alloy, temper, and thickness.
| Alloy / Temper | Tensile Strength MPa | Yield Strength MPa | Elongation % |
|---|---|---|---|
| 1050 O | 55–95 | ≥20 | ≥25 |
| 1060 H24 | 95–135 | ≥75 | ≥4 |
| 1100 H14 | 95–125 | ≥75 | ≥3 |
| 3003 H14 | 120–160 | ≥95 | ≥4 |
| 3003 O | 95–130 | ≥35 | ≥20 |
| 3105 H24 | 145–185 | ≥115 | ≥3 |
| 5052 H32 | 210–260 | ≥160 | ≥7 |
Typical Chemical Composition
Below are common reference values for several popular alloys. Exact composition should comply with the requested standard.
| Alloy | Si % | Fe % | Cu % | Mn % | Mg % | Zn % | Others % | Al % |
|---|---|---|---|---|---|---|---|---|
| 1050 | ≤0.25 | ≤0.40 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.05 | ≤0.03 each | ≥99.50 |
| 1060 | ≤0.25 | ≤0.35 | ≤0.05 | ≤0.03 | ≤0.03 | ≤0.05 | ≤0.03 each | ≥99.60 |
| 1100 | Si+Fe ≤0.95 | - | 0.05–0.20 | ≤0.05 | - | ≤0.10 | ≤0.05 each | ≥99.00 |
| 3003 | ≤0.60 | ≤0.70 | 0.05–0.20 | 1.0–1.5 | - | ≤0.10 | ≤0.05 each | Remainder |
| 3105 | ≤0.60 | ≤0.70 | ≤0.30 | 0.30–0.80 | 0.20–0.80 | ≤0.40 | ≤0.05 each | Remainder |
| 5052 | ≤0.25 | ≤0.40 | ≤0.10 | ≤0.10 | 2.2–2.8 | ≤0.10 | Cr 0.15–0.35 | Remainder |
| 8011 | 0.5–0.9 | 0.6–1.0 | ≤0.10 | ≤0.20 | ≤0.05 | ≤0.10 | ≤0.05 each | Remainder |
Surface and Processing Features
Mill finished aluminum coil is often selected because it is easy to process in downstream manufacturing.
| Property | Performance |
|---|---|
| Surface appearance | Natural metallic finish with rolling marks permissible |
| Corrosion behavior | Good in atmosphere, better with suitable alloy selection |
| Weldability | Good for many non-heat-treatable alloys |
| Forming ability | Excellent in O temper, good in H tempers depending on hardness |
| Anodizing suitability | Very good for selected alloys such as 5005 |
| Coating suitability | Good substrate for PE, PVDF, epoxy, and laminated finishes |
Advantages for Buyers
For customers seeking a balance between performance and price, mill finished hot cold rolled aluminum coil offers several practical benefits.
| Advantage | Customer Value |
|---|---|
| Lightweight | Reduces transport cost and structural load |
| Corrosion resistant | Extends service life in outdoor and industrial environments |
| Easy fabrication | Supports cutting, bending, punching, and roll forming |
| Wide alloy choice | Matches electrical, architectural, insulation, or structural use |
| Cost-effective | No extra finishing process means lower material cost |
| Recyclable | Environmentally friendly and sustainable material option |
How to Choose the Right Coil
Selection should be based on the final application, fabrication method, and service environment. For deep drawing or heavy forming, softer tempers such as O temper are preferred. For roofing, cladding, and general sheet metal, 3003, 3105, or 5052 in H tempers are common choices. For electrical conductivity, 1050 or 1060 is often selected. If appearance after anodizing matters, 5005 is a strong option.
Buyers should confirm the following before ordering:
| Selection Factor | What to Confirm |
|---|---|
| Alloy | Strength, corrosion resistance, conductivity, appearance |
| Temper | Softness or hardness required for fabrication |
| Thickness and width | Match processing equipment and end-product design |
| Standard | ASTM, EN, GB/T, JIS, or custom requirement |
| Surface quality | Mill finish grade and allowable defects |
| Tolerance | Thickness, width, camber, flatness |
| Packaging | Export seaworthy packing, eye to sky, eye to wall |
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