Aluminum 3003 car radiator | 3003 aluminum car radiator

Why 3003 Aluminum Is The Most Common Aluminum Alloy


Aluminum ore is the most abundant metal element in the Earth’s crust. It is converted from bauxite, a sedimentary rock that is comprised of a number of aluminum and other compounds. While aluminum has become invaluable to a range of industries, it is not easy to access and undergoes a complex conversion process before becoming the lightweight metal that we rely on every day.

More than that, it is not pure aluminum that is most commonly used in manufacturing, but aluminum alloy. Aluminum alloys are preferred for their superior properties over pure aluminum, achieved by adding metallic elements like magnesium, zinc, and copper to the aluminum base.

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Aluminum Spec Sheet

There are so many aluminum alloys that the Aluminum Association developed a four-digit classification based on both their alloying elements and their characteristics to keep them organized. Aluminum 3003, part of the 3xxx alloy series, is not just a common alloy. It is among the most common of aluminum alloys in the 3xxx series and among all alloys and is considered one of the best general-purpose aluminum alloys around. Why is that?

What Is The Chemical Composition of 3003 Aluminum?

Alloy Si Fe Cu Mn Mg Cr Zn Ti
3003 0. 0.7 0.05- 1.0 0.0 0.0 0.1 0.0<

The alloy gets a 20% boost in strength beyond 1100 grade aluminum, otherwise known as pure aluminum, thanks to the addition of Manganese and Copper. While the increase in strength is beneficial, aluminum 3003 is generally considered moderate strength compared to other aluminum tempers and metals. When it comes to formability, however, its strength turns out to be an asset.

What Are The Typical Mechanical Properties of 3003 & Its Tempers?

Mechanical Properties

Strength (KSI) Elongation % in 2 In.
Alloy & Temper Ultimate Min. – Max. (KSI) Yield Set 0.2% 1/16” Thick ½” Dia. Brinell Hardness
3003-0 14 – 19 6 30% 40 28
3003-H12 17 – 23 18 10% 20 35
3003-H14 20 – 26 21 8 16 40
3003-H16 24 – 30 25 5% 14 47
3003-H18 27 – – 27 4% 10 55

What Are Its Comparative Characteristics & Applications?

In addition to its moderate strength, aluminum 3003 is easily welded and brazed. It has excellent corrosion resistance, workability, and it may be deep drawn or spun.

Resistance to Corrosion Weldability
Alloy General Stress-Corrosion Cracking Workability (Cold) Machinability Brazeability Gas Arc Resistance Spot & Seam
3003-0 A A A E A A A B
3003-H14 A A B D A A A A

How to Understand the Ratings

Ratings A through E are ratings that are relative in decreasing order of merit. They are based on exposures to sodium chloride solution by immersion or intermittent spraying. You can use alloys in industrial and seacoast atmosphere without protection if they have ratings of A or B. You should protect alloys, at least on surfaces with joints, if they have C, D, or E ratings. This data was pulled from the 2013 Aluminum Standards & Data. For more information, please refer to documentation by the Aluminum Association

Can you Harden 3003 Aluminum?

Aluminum 3003 is a “wrought” alloy because it is comprised of less than 4% alloying elements. This is in comparison to “cast” alloys that contain up to 22% alloying elements. There are two kinds of wrought alloys, heat-treated or work-hardened. 3003, like the other 3xxx alloys, as well as 5052, another common alloy that can sometimes be used interchangeably with 3003, is work-hardened. As a work-hardened alloy, aluminum 3003 is also frequently described as non-heat-treatable. Work hardening uses mechanical deformation like rolling or hammering to change to the structure of the metal to be stronger and less ductile.

Can You Weld 3003 Aluminum?

3003 aluminum is readily welded with conventional methods. The filler rod is typically aluminum 1100. When welding 3003 to other aluminum alloys, such as 5052, 6061, or 6062, the filler rod should be 4043 aluminum.

Can You Bend 3003 Aluminum?

One of the most beneficial properties of aluminum is its formability. Bending is one of the main ways to form metal and bending aluminum is both useful and cost-effective. Some aluminum alloys are more suited to bending than others. Bending depends upon a few factors, including formability, thickness and bend radius, and percentage of elongation. When considering all three, 3003 aluminum is an excellent, arguably the best among other alloyed grades, candidate for bending. Between moderate strength, good cold workability, and high elongation, it offers one of the biggest differences between yield and tensile strength, making it suitable for bending.

What are 3003 Aluminum’s Physical Properties:

Property 3003 Data
Density, lb/in3 0.099
Modulus of Elasticity, psi 10.0 x 106
Coefficient of Thermal Expansion, 68-212˚F, /˚F 12.9 x 10-6
Thermal Conductivity, Btu/ft hr ˚F 112
Specific Heat, Btu/lb ˚F 0.213
Electrical Resistivity, Microohm-in 1.374

What Are The Applications of 3003 Aluminum?

In general, you will find aluminum 3003 in settings that require both moderate strength and good weldability. Because it is so widely used, it is called a general-use alloy.

  • Building Products: Aluminum 3003 is used in roofs, folded sheets, sidings, garage doors, and acoustic ceilings
  • Food & Chemical Industry: The alloy is used in storage containers, fabricated metal products, pipes, cooking utensils, refrigerator panels, ice cube traps, chemical handling equipment, appliance components, and more
  • Automotive: 3003 is used in truck and trailer roofing
  • HVAC: Aluminum 3003 is used in the cooling units of heat engines including radiators since it is light and thermal conducive. In heating and cooling systems, it is also used in conditioning evaporators, car radiators, and heat exchangers
  • Oil & Gas: The alloy is used in gas lines, pipe jacketing, fuel tanks, pressure vessels, and more
  • Architectural: You will also see 3003 in architectural and outdoor applications

Aluminum 3003 car radiator

How Much Does The Alloy Cost?

Depending on availability and market conditions, 3003 is generally slightly cheaper on a per pound basis than similar alloys like 5052. However, the higher density of 3003 may cancel out the lower price. To calculate the weights of aluminum sheet, you would use the following formula:

  • Decimal thickness * width * length * density = aluminum sheet weight.

3003 aluminum has a density of .099 pounds/inch cubed and 5052 has a density of .097 pounds/inch cubed. So, for example, to calculate the weight of 3003 aluminum sheet with a decimal thickness of .125 and non-standard dimensions of 48” and 82”, you would multiple .125 * 48 * 82 * .099, for a value of 48.71lb.

You can already see how the higher density of .099 may offset the higher cost of aluminum alloy 5052. In this case, the 5052 sheets would be 47.72lb. Of course, the larger the purchase, the larger the impact of the difference in density will be. 3003 can also be purchased as coil, but in that situation, it would normally be sold to scale weight.

What is the Difference Between 3003 and 5052 Aluminum?

We frequently get this question and we answered it at length in a separate blog post on the difference between 5052 & 3003 aluminum. In general, 3003 is fairly soft and has good corrosion resistance, good drawing, good workability, moderate strength, and is weldable, while 5052 is stronger and has better corrosion resistance, good drawing, good formability, higher strength, and is also weldable. Both are also non-heat-treatable. But, for all the differences, 3003 and 5052 are interchangeable in many applications and, after you factor in their difference in density, the cost can be very similar.

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Kloeckner Metals is a full-line aluminum supplier and service center. Kloeckner Metals combines a national footprint with the latest fabrication and processing technologies and most innovative customer service solutions.

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Natalie Spira
Natalie Spira is Kloeckner's Acquisition Marketing Manager. Previously, she was the Founder and CEO of Fraction Marketing, a marketing agency providing fractional support to scaling startups with a focus on acquisition marketing and demand generation. Natalie holds a MBA from Tel Aviv University with concentrations in entrepreneurship and marketing and a BA in English from UCLA.
Aluminum 3003 car radiator | 3003 aluminum car radiator
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