Gnee Steel (Tianjin) Co., Ltd. is one of the most reliable manufacturers and suppliers of 3003-h18 aluminum sheet in China. With abundant experience, we warmly welcome you to wholesale high quality 3003-h18 aluminum sheet in stock here from our factory. Good service and reasonable price are available.
3003-H18 Aluminum Sheet Description
In simple terms, 3003-H18 is an aluminum-manganese alloy (3003 series) that has been strengthened to its maximum level through cold working. This is known as a "full-hard" temper, designated by "H18."
The key characteristics of the 3003-H18 Aluminum Sheet:
- High Strength: It is significantly stronger and harder than softer tempers of the same alloy.
- Excellent Corrosion Resistance: It performs very well in various atmospheric conditions.
- Not Formable: This is the most critical point to understand. Due to its full-hard state, it cannot be bent or formed without cracking. It is designed exclusively for flat applications.
It is a primary material for industries like construction, industrial manufacturing, and transportation where rigidity and durability in a panel form are essential.
Key Features of 3003-H18 Aluminum Sheet
- Full Hard Temper (H18): This provides maximum stiffness and resistance to denting and surface damage.
- Higher Strength than H14/H24 Tempers: When compared to other common tempers, H18 offers the highest tensile and yield strength, making it ideal for structural panels that do not require forming.
- Excellent Corrosion Resistance: The 1.2% manganese content gives this alloy superior resistance to weathering and corrosion, making it a long-lasting choice for outdoor use.
- Lightweight and Cost-Effective: Like all aluminum alloys, 3003 provides an excellent strength-to-weight ratio, reducing structural load and shipping costs. It is one of the most economical corrosion-resistant alloys available.
- Good Surface for Finishing: The standard mill finish is clean and uniform, making it an excellent base for painting, coating, or other decorative finishes.
Chemical Composition of the 3003 Aluminum Alloy
The performance of 3003-H18 is determined by its precise chemical composition, which we strictly control to meet international standards.
| Element | Content (%) |
| Aluminum (Al) | Balance |
| Manganese (Mn) | 1.0 – 1.5 |
| Copper (Cu) | 0.05 – 0.20 |
| Silicon (Si) | ≤0.6 |
| Iron (Fe) | ≤0.7 |
| Zinc (Zn) | ≤0.1 |
Manganese (Mn) is the key alloying element that provides the strength and corrosion resistance that the 3003 series is known for.
Mechanical Properties of 3003 H18 Temper
These values clearly illustrate the trade-off between strength and ductility. For engineers and buyers, these numbers are critical for material specification.
| Property | Typical Value Range |
| Tensile Strength | 140 – 180 MPa |
| Yield Strength | ≥120 MPa |
| Elongation (%) | ≤5% |
| Hardness | ~45–55 HB |
What This Means for You: The most important figure here is Elongation (≤5%). A low elongation value means the material has very little "stretch." It will fracture before it bends. This is the technical reason why 3003-H18 is a non-formable material and should only be used for flat sheet applications.
Specifications of 3003-H18 Aluminum Sheet
| Specification | Details |
|---|---|
| Thickness | 0.3 mm – 200.0 mm |
| Width | 100 mm – 2500 mm |
| Regular width | 1000/1250/1500/2000 |
| Length | 1000 mm – 12000 mm |
| Standards | ASTM B209 / EN 485 / GB/T 3880 |
|
Forms |
3003-H18 Aluminum Sheet: Cut to specific lengths and widths, ready for immediate use. read more:3003-h18-forming-limitations |
| Surfaces | Polished (for a reflective finish), Brushed (for a satin, decorative look), Stucco Embossed (hides fingerprints and minor dings), and Color Coated. PE (Polyester) or PVDF (Polyvinylidene Fluoride) coating in a wide variety of colors. These are commonly used for architectural roofing and facade panels. Anodizing: An electrochemical process that increases surface hardness and corrosion resistance while also allowing for coloring. |
Manufacturing Process of 3003 H18 Temper
The unique properties of H18 are created through a precise manufacturing process:
- Melting and Casting: We start by melting high-purity aluminum ingots with the specified alloying elements.
- Hot Rolling: The cast slab is passed through rollers at high temperatures to significantly reduce its thickness.
- Cold Rolling: This is the key step. The sheet is then rolled at room temperature. This cold-working process compresses the metal's grain structure, which increases its hardness and strength. To achieve the H18 temper, the material is strain-hardened to its maximum practical extent.
- Leveling and Cutting: The final coil is precision-leveled to ensure excellent flatness and then cut to your required sheet or coil dimensions.
Common Applications of 3003-H18 Aluminum
You will find the 3003-H18 aluminum sheet in many common applications where a flat, strong panel is needed:
Building and Construction:
Roofing Sheets: Their corrosion resistance and rigidity make them perfect for industrial and commercial standing seam or corrugated roofing.
Exterior Wall Panels (Cladding): Used in facade systems where flat, durable decorative panels are required.
Building and Construction:
Equipment Casings and Enclosures: Protects machinery and electronics.
Protective Plates and Shields: Used as kick plates or guards in high-traffic areas.
Transportation:
Truck Trailer Linings: The interior walls of truck trailers are often lined with 3003-H18 for impact resistance and durability.
Signage Boards: Provides a perfectly flat and weather-resistant backing for road signs and commercial signage.
Read more: What is 3003 H18 Aluminum Sheet Used For?
Advantages vs. Other Tempers (H14, H24)
This is one of the most common questions we receive. Understanding the difference is key to choosing the right material.
| Temper | Strength | Formability | Typical Use |
| H14 | Medium | Good | General-purpose applications requiring some bending and forming. |
| H24 | Medium-High | Moderate | Structural panels or parts requiring limited forming. |
| H18 | Highest | Very Low | Strictly flat applications: roofing, wall panels, flat stock. |
Choosing the right temper is critical. Selecting H18 for a project that needs forming will lead to material failure and budget overruns. If you are unsure whether H18, H24, or H14 is the correct choice for your application, don't guess. Contact our technical team for a free material consultation to ensure you get it right the first time.
Why Choose GNEE Aluminum
Our Quality Control Process
As a professional aluminum sheet supplier, we guarantee quality through rigorous inspection at every stage:
- Chemical Composition Analysis: We test every melt to ensure it meets the 3003 alloy standard.
- Mechanical Property Testing: We conduct tensile, yield, and elongation tests to verify the H18 temper.
- Surface Quality Inspection: Every sheet is inspected for scratches, oil stains, or other defects.
- Dimensional Tolerance Control: We use precision equipment to ensure thickness, width, and length are within the agreed-upon tolerances.
- Third-Party Certification: We can provide inspection reports from SGS, BV, or other third-party agencies upon request.
Packaging and Logistics for Global Shipping
We understand that protecting your material during transit is non-negotiable. Our standard export packaging is designed to prevent moisture, oxidation, and scratches.
- Standard Packaging: Sheets are stacked on standard export wooden pallets. The entire package is wrapped in a waterproof plastic film with desiccant bags placed inside to absorb moisture.
- Coil Packaging: Coils can be shipped eye-to-wall or eye-to-sky, with robust protection to prevent core damage and unwinding.
- Custom Packaging: For high-value or surface-critical orders, we offer fully enclosed wooden crate packaging.
Why Choose GNEE Aluminum?
- Professional China-based Supplier: We have years of experience focusing exclusively on aluminum products.
- Stable Inventory & Fast Delivery: We maintain a ready stock of common 3003-H18 specifications to ensure quick turnaround times.
- Multiple Alloy Expertise: Beyond 3003, we are experts in 5052, 5083, 6061, and other major alloys.
- Global Export Experience: We have successfully shipped to clients worldwide and understand the logistics and documentation requirements for your region.
Get Your Quote and Free Sample
Ready to move forward? We understand that pricing and material verification are key to your decision. We provide fast, transparent quotes and can arrange for free samples to be sent for your evaluation. Click here to get your quote within 24 hours and request a free sample.
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