When sourcing pure aluminum for industrial manufacturing, selecting the right alloy is only half the battle. The temper-how the metal is processed and treated-determines whether the material will bend smoothly or crack on your production line. For the 1050 aluminum series (99.5% purity), the two most commonly debated tempers are H111 and O.
The main difference between 1050 H111 and 1050 O aluminum lies in their mechanical properties and processing conditions. 1050 O is fully annealed, offering maximum ductility and softness for extreme forming. In contrast, 1050 H111 undergoes slight strain hardening, giving it a higher yield strength and better handling stability while still retaining excellent formability.
- 1050 H111 = Slightly strain-hardened for higher strength and flat stability.
- 1050 O = Fully annealed, the softest temper for maximum deep drawing.
Choosing the wrong temper can lead to high scrap rates, tooling damage, or structural failure. In this comprehensive guide, we will break down the exact differences in mechanical properties, applications, and manufacturing behavior to help you make the right purchasing decision.
Struggling with cracked parts or deformed plates during fabrication? Don't waste money on the wrong material. Contact GNEE's engineering team today for free technical advice and sample support to test 1050 H111 and O tempers on your actual production line.
What is 1050 O Aluminum Sheet?
The "O" designation stands for "annealed." A 1050 O aluminum sheet is heated in a specialized furnace to a specific temperature and then cooled slowly. This thermal process completely relieves any internal stresses created during the rolling process and recrystallizes the metal's grain structure.
Key characteristics of 1050 O:
- Fully Annealed: It is in the softest possible condition for this alloy.
- Maximum Ductility: It can stretch and deform significantly without breaking.
- Zero Springback: When bent, it holds the exact shape of the die.
- Best for Extreme Forming: It is the undisputed choice for deep drawing, metal spinning, and complex stamping.
What is 1050 H111 Aluminum Plate?
The "H" designation means the aluminum is strain-hardened (cold-worked). However, the "111" suffix is very specific. A 1050 H111 aluminum plate is not rolled to a fully hard state. Instead, it undergoes a slight amount of work hardening, typically during post-rolling processes like tension leveling or stretching to ensure absolute flatness.
Key characteristics of 1050 H111:
- Slightly Strain-Hardened: It has absorbed a minimal amount of cold work.
- Higher Yield Strength: It is stiffer and holds its flat shape much better than the O temper.
- Excellent Formability: While not as extreme as the O temper, it easily handles 90-degree bends and moderate forming.
- Better Machinability: It cuts cleaner on CNC lasers and shears without gumming up the tools like the overly soft O temper can.
1050 H111 vs 1050 O Aluminum Comparison Overview
To give you a clear picture of how these two tempers stack up against each other, review the basic property comparison below.
| Property | 1050 O Aluminum | 1050 H111 Aluminum |
| Temper Type | Fully Annealed (Soft) | Slight Work Hardening |
| Tensile Strength | Lower | Slightly Higher |
| Yield Strength | Very Low | Higher |
| Ductility | Excellent | Very Good |
| Formability | Best | Very Good |
| Hardness | Very Soft | Slightly Harder |
| Typical Use | Deep drawing, spinning | General fabrication, tank rolling |
1050 O vs 1050 H111 Aluminum Mechanical Properties
For engineers and buyers, hard data is essential. The mechanical properties dictate how much force your press brake needs and how much load the final part can bear.
| Mechanical Property | 1050 O Temper | 1050 H111 Temper |
| Tensile Strength (Rm) | 60 – 80 MPa | 65 – 95 MPa |
| Yield Strength (Rp0.2) | ≥ 20 MPa | ≥ 30 MPa |
| Elongation (A50mm) | ≥ 25% | ≥ 20% |
Note: The exact values may vary slightly depending on the thickness of the plate and the specific EN or ASTM standard applied.
1050 O vs 1050 H111 Aluminum Key Differences Explained
1. Strength and Handling
Because the yield strength of 1050 O is only around 20 MPa, it is incredibly soft. If you buy a large 1050 O aluminum sheet (e.g., 2000mm x 4000mm) in a thin gauge, it will literally sag and flop when lifted by a crane. It is highly susceptible to surface dents and edge damage during transport.
1050 H111, with a yield strength of ≥ 30 MPa, has just enough rigidity to stay flat. It is much easier to load onto a laser cutting bed or punch press without warping the sheet under its own weight.
2. Formability and Deep Drawing Limits
If you are manufacturing cylindrical chemical containers or kitchen pots using a deep drawing process, the metal needs to flow into the die without tearing. 1050 O is the winner here. Its ≥ 25% elongation allows it to be stretched deeply. 1050 H111, while formable, may experience micro-tearing if pushed to extreme drawing depths because the slight work-hardening has already used up a fraction of its ductility.
3. Welding Stability
Both tempers offer excellent weldability (TIG and MIG) due to the 99.5% pure aluminum base. However, when welding thick plates, 1050 O can sometimes distort heavily due to heat input because it lacks inherent rigidity. 1050 H111 maintains its structural integrity better during the welding of large structures like storage tanks.
How to choose the appropriate 1050 aluminum temper?
Match the temper to your specific end-product to avoid manufacturing headaches.
Applications of 1050 O Aluminum Sheet
- Deep drawing parts: Pots, pans, and mixing bowls.
- Metal spinning: Lighting reflectors, lamp shades, and ventilation funnels.
- Chemical equipment: Gaskets, seals, and complex heat exchanger components.
- Packaging: Foil blanks and flexible packaging containers.
Applications of 1050 H111 Aluminum Plate
- Chemical storage tanks: Silos, transport tanks, and low-pressure vessels.
- Electrical busbars: Heavy-duty electrical conductors requiring flat profiles.
- Sheet metal fabrication: Enclosures, covers, and cabinets requiring 90-degree bending.
- Architectural panels: Decorative facades and reflective panels.
How to Choose Between 1050 H111 and O?
If you are still unsure which 1050 aluminum temper to order, use this simple checklist:
Choose 1050 O Aluminum if:
- You are performing extreme deep drawing or metal spinning.
- Your design requires the material to be stretched into complex, tight shapes.
- You need zero springback after pressing.
- You require the absolute highest elongation percentage possible.
Choose 1050 H111 Aluminum if:
- You are fabricating large tanks, silos, or flat panels.
- You need to bend the metal (e.g., press brake folding) but don't need to stretch it deeply.
- You need better dimensional stability and handling strength on the shop floor.
- You are performing CNC laser cutting or routing and need the plate to stay perfectly flat.
GNEE Supply Advantage: Your Trusted 1050 Aluminum Plate Supplier
- Heavy Inventory: We stock hundreds of tons of both 1050 O aluminum sheet and 1050 H111 aluminum plate, ranging from 1mm to over 100mm in thickness.
- Custom Cutting: We don't just sell standard sizes. We offer precision cut-to-size services to reduce your internal scrap rates.
- Mixed Loading: Need 1050 pure aluminum, 5083 marine grade, and 6061 structural plates? We support multi-alloy combined container orders to optimize your cash flow.
- Certified Quality: Every batch comes with a detailed Mill Test Certificate (MTC) proving EN 573 / EN 485 compliance.
Request a Quote Today
Not sure whether to choose 1050 H111 or O aluminum for your next project? Let our experts help you calculate the costs and technical requirements.
Ready to streamline your procurement? Send us your drawing or material list today for a fast, competitive quotation.
Contact GNEE for:
- Free technical advice and temper selection.
- Direct-from-factory competitive pricing.
- Sample support and international shipping rates.
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