3003 H18 aluminum alloy is a manganese (Mn)-containing alloy belonging to the 3xxx series and reaches maximum strain-hardened condition due to the H18 temper. This alloy is preferred especially in applications requiring surface durability and form stability due to its high work hardening. Its corrosion resistance is very high and provides long-term durability especially in atmospheric conditions, humid environments, and areas exposed to mild chemical effects. Compared to pure aluminum, it offers better mechanical properties while maintaining environmental resistance.

In terms of strength, 3003 H18 provides significantly higher strength compared to softer tempers in the same series. However, this results in reduced ductility. For example, compared to 3003 H112, it offers much higher strength but lower formability. Compared to 5052-H32, 5052 offers higher strength and better seawater resistance, while 3003 H18 provides a more economical and sufficient performance. Compared to 6061-T6, 6061 provides much higher strength, but 3003 H18 offers better corrosion resistance and surface stability.

In terms of machinability, 3003 H18 is moderate, but machining operations may be difficult due to its high hardness. This alloy is mostly used in sheet form. Its bending capability is limited due to the H18 temper; the risk of cracking increases during bending because of high hardness. Therefore, it is preferred in applications requiring low deformation or pre-formed products. Its cold forming capability is lower than H14 or H12 tempers.

In terms of coating capability, it performs very well. It is suitable for anodizing, painting, and other surface treatments. This provides an advantage especially for decorative surfaces and architectural applications. Additionally, its surface hardness provides higher resistance against scratches. In terms of vibration response, it offers good damping characteristics and provides vibration control in thin sheet applications.

Its weldability is generally good, although mechanical properties may change in the weld zone due to high hardness. It can be welded using MIG and TIG methods. The 3003 H18 alloy is used in many sectors such as automotive trim parts, cladding panels, signage production, packaging industry, HVAC systems, and architectural applications. It stands out especially in applications requiring surface quality, corrosion resistance, and lightness.

3003 H18 Choosing Factors

• Round Rod/Flat
• Tube/Profile