What are the temper of 5052 aluminum sheet and what do they represent?

Direct answer: 5052 is a non-heat-treatable aluminum-magnesium alloy. Its sheet temper describes the strain-hardened and stabilization or partial-annealing condition, which changes strength, formability and fabrication behavior.

How the 5052 Temper Designation Works

The temper follows the alloy number because the same 5052 chemistry can be delivered with very different strength and forming response. O identifies the annealed condition. H identifies a strain-hardened condition. The digits after H describe the processing route and the degree of strain hardening or the stabilized condition.

O temper

5052-O is annealed for high ductility and forming capability. It is often considered when severe forming is more important than the higher strength of a strain-hardened sheet. The finished component still needs validation for load, fatigue, joining and service environment.

H1x strain-hardened conditions

H12, H14, H16 and H18 represent increasing degrees of strain hardening. In general, strength rises while elongation and forming margin decrease as the second digit increases. Exact limits must come from the applicable material standard for the ordered thickness.

H2x partially annealed conditions

H22, H24, H26 and H28 reach the required strength through strain hardening followed by partial annealing. They may provide a different balance of strength and formability from an H1x condition, so the two families should not be substituted without engineering approval.

H3x stabilized conditions

H32, H34, H36 and H38 are strain hardened and then stabilized. Stabilization is relevant to aluminum-magnesium alloys because it helps control property changes over time. H32 and H34 are common procurement choices, but that does not make them universal defaults.

What Changes When the Temper Changes

• Strength and hardness: generally increase with greater strain hardening.
• Elongation and bendability: generally decrease as the condition becomes harder.
• Forming sequence: deep drawing, bending and roll forming may require a softer starting condition.
• Welding: the heat-affected zone can lose strain-hardened strength; joint design must use the applicable design basis.
• Surface and flatness: handling, leveling, forming and cutting requirements should be stated separately from temper.

A Practical Selection Workflow

1. Define the final part geometry, loads, corrosion exposure and governing standard.
2. Identify forming severity, minimum bend radius, welding and downstream processing.
3. Select a candidate 5052 temper and thickness range from the applicable product standard.
4. Confirm directional mechanical properties, dimensional tolerances and surface requirements.
5. Prototype or qualify critical forming and joining operations before production release.

Information to Include in the RFQ

• 5052 alloy and full temper designation
• Governing material standard and required edition
• Thickness, width, length, quantity and dimensional tolerances
• Surface finish, protective film and acceptable appearance
• Testing, certificate, traceability and packing requirements
• Forming, welding or service conditions that affect selection

Temper selection should support the finished part rather than optimize only one headline property. When a drawing permits alternatives, compare strength, formability, joining and total processing risk before approving a substitute.