Two sheets of 5052 aluminum can have the same thickness, chemical composition and surface finish, yet behave differently when they are bent or put under load. The difference often comes down to temper.
5052-H32 and 5052-H34 are both commonly specified for sheet-metal fabrication. H32 provides a useful balance of strength and formability, while H34 offers higher strength and hardness with less room for deformation. Neither is automatically the better choice.
Short answer: Choose 5052-H32 aluminum sheet when bending, stamping and forming flexibility are important. Choose 5052-H34 when the finished part needs greater resistance to permanent deformation and the forming requirements are less demanding. Always check sheet thickness, bend radius and the applicable material standard before making a substitution.
| Feature | 5052-H32 | 5052-H34 |
|---|---|---|
| Temper | Strain-hardened and stabilized, quarter-hard | Strain-hardened and stabilized, half-hard |
| Strength | Lower | Higher |
| Hardness | Lower | Higher |
| Formability | Generally better | More limited |
| Tight bending | More forgiving | May require a larger radius |
| Elastic stiffness | Essentially the same | Essentially the same |
| Corrosion resistance | Good | Comparable |
| Typical selection | Bent enclosures, covers and formed parts | Panels and components requiring higher yield strength |
Both tempers belong to the same 5052 aluminum-magnesium alloy. Their main difference is mechanical condition, not chemical composition.
5052 is a non-heat-treatable 5xxx-series aluminum alloy containing approximately 2.2–2.8% magnesium. It develops strength primarily through alloying and cold working rather than precipitation-hardening treatments such as T6.
The temper designation explains the condition of the material after processing.
The letter H indicates strain hardening. The number 3 identifies material that has been strain-hardened and stabilized, while the final digit 2 indicates a quarter-hard condition.
5052-H32 has higher strength than fully annealed 5052-O but retains useful ductility for many bending and forming operations. This makes it a practical choice for fabricated sheet-metal components.
5052-H34 follows the same processing classification, but the final digit 4 indicates a half-hard condition.
Compared with H32, H34 has higher strength and generally higher hardness. The trade-off is reduced ductility, which can make sharp bends and demanding forming operations more difficult.
Both H32 and H34 are stabilized tempers. This does not mean that H34 has received a conventional precipitation-hardening heat treatment or that it has a different alloy composition.
Mechanical properties offer a useful starting point, but the type of values being compared matters. Typical test results should not be confused with minimum or maximum requirements in a material standard.
The following comparison uses ASTM B209/B209M-21a reference requirements for 5052 sheet and plate. Metric strength figures are approximate conversions from the listed inch-pound values.
| Mechanical Property | 5052-H32 | 5052-H34 |
|---|---|---|
| Tensile strength | 214–262 MPa (31–38 ksi) | 234–283 MPa (34–41 ksi) |
| Minimum yield strength (0.2% offset) | Approximately 159 MPa (23 ksi) | Approximately 179 MPa (26 ksi) |
| Minimum elongation at 1.30–2.87 mm thickness | 7% | 6% |
| Relative hardness | Lower | Higher |
| Elastic modulus | Broadly similar | Broadly similar |
The strength figures describe specified material requirements, not guaranteed actual test results for every individual sheet. The elongation figures apply only to the stated thickness band. Other thicknesses have different elongation requirements.
Yield strength indicates the stress level at which permanent deformation begins under a specified test condition.
If two components have the same dimensions and load arrangement, H34 generally provides a higher resistance to yielding than H32 in the unwelded material.
This can be valuable for protective covers, equipment panels and components exposed to handling loads.
However, higher yield strength does not automatically mean higher elastic stiffness.
Both tempers have essentially the same elastic modulus because they share the same base alloy. If a flat panel bends too much under a load but returns to its original shape afterward, changing from H32 to H34 alone may not solve the deflection problem. Increasing thickness, adding reinforcement or changing the panel geometry may be more effective.
Elongation is one measure of ductility, but it must be interpreted together with the test method and product thickness.
For example, ASTM B209/B209M-21a gives different minimum elongation requirements for the following thickness bands:
| Sheet Thickness | H32 Minimum Elongation | H34 Minimum Elongation |
|---|---|---|
| 0.51–1.27 mm (0.020–0.050 in.) | 5% | 4% |
| 1.30–2.87 mm (0.051–0.113 in.) | 7% | 6% |
| 2.90–6.32 mm (0.114–0.249 in.) | 9% | 7% |
These are thickness-dependent specification minimums, not predictions of the elongation measured on a particular shipment.
This is why a supplier’s general statement that H32 has 12% elongation and H34 has 10% elongation should not be used as a universal purchasing requirement. Such figures may be useful as typical reference values, but certified acceptance limits depend on the ordered standard and product dimensions.
For many fabricators, the most important difference between 5052-H32 and 5052-H34 appears during bending rather than in a tensile test.
5052-H32 generally offers more forming margin than H34. It is often easier to work with when a part has multiple bends, narrow flanges or limited space around the bend.
H34 can also be bent successfully, but it may require a larger inside bend radius to reduce the risk of cracking.
There is no single bend radius that applies to every 5052-H32 or H34 sheet. Bendability depends on thickness, rolling direction, material condition, cut-edge quality, tooling and the bending process.
For a drawing with a critical inside bend radius, confirm the requirement with the material supplier and fabrication shop before selecting the temper.
Both H32 and H34 can be used in suitable stamping and roll-forming operations.
H32 is generally the better starting point when the process involves more deformation or several forming stages. H34 is worth considering when the geometry is relatively simple and the finished component benefits from higher strength.
For deep drawing or severe forming, even H32 may not provide sufficient ductility. In such cases, 5052-O should be evaluated rather than assuming that H32 is the softest available option.
Springback is the elastic recovery that occurs after the bending force is removed.
Because H34 has a higher yield strength, it may show greater springback under comparable forming conditions. Tooling and bend allowance may therefore need adjustment.
Rolling direction also matters. Bends made in different orientations relative to the grain structure can behave differently, particularly when the inside radius is small.
For repeat production, test the actual material with the intended tooling before approving a change from H32 to H34.
H32 and H34 share the same base 5052 alloy chemistry, so their general corrosion-resistant characteristics are broadly comparable.
Both are used for industrial equipment, outdoor components, transportation applications and suitable marine-related fabrication.
A harder temper should not be selected simply because the component will be exposed to salt spray. Corrosion performance also depends on surface condition, drainage, fasteners, contact with dissimilar metals and the operating environment.
Both tempers are also weldable using appropriate aluminum welding procedures.
However, welding can soften strain-hardened aluminum in the heat-affected zone. The welded joint may therefore have lower strength than the original H32 or H34 sheet.
If the component is welded and load-bearing, the design should use appropriate welded-condition properties rather than relying solely on the strength of unwelded H34 material.
For more demanding marine structures, buyers should also review whether a different alloy and temper, such as those available in 5083 aluminum sheet and plate, is required by the project specification.
The right temper depends on the component’s geometry, manufacturing process and service requirements.
| Application | Starting Temper | Selection Reason |
|---|---|---|
| Electrical cabinets and equipment enclosures | H32 | Useful forming margin for multiple bends and flanges |
| Flat protective panels and machinery covers | H34 | Higher yield strength where forming is limited |
| Bent brackets and fabricated housings | H32 | More forgiving for controlled bending |
| Tanks and welded containers | H32 for initial evaluation | Formability and weldability; joint properties require review |
| Stamped or roll-formed components | H32 or H34 | Depends on forming severity and finished-part strength |
| Deep-drawn components | Consider O temper | Greater ductility may be necessary |
These are starting recommendations, not mandatory material assignments.
For example, a simple protective panel may benefit from H34 if resistance to permanent deformation is important. But if the same panel has several tight return bends, H32 may be easier to manufacture consistently.
Likewise, a bracket made from H34 may have higher unwelded yield strength, but an H32 bracket with a better section shape or suitable reinforcement may perform more effectively in the finished assembly.
The best choice should consider material cost, fabrication yield, tooling changes and the strength requirements of the finished part—not just the higher number on a material data sheet.
Not automatically.
Although both tempers have the same alloy composition, changing the temper can affect bending behavior, springback, dimensional consistency and finished-part performance.
Before approving a substitution, check:
If the drawing explicitly requires 5052-H32, supplying H34 without approval is not an appropriate substitution simply because H34 has higher strength.
A good purchase specification should identify more than the alloy number.
For example:
Material: AA 5052-H32 aluminum sheet
Standard: ASTM B209/B209M, agreed edition
Thickness: 2.0 mm
Width × Length: According to drawing
Surface: Mill finish
Inspection: Material test certificate and agreed dimensional requirements
For H34, replace the temper designation and confirm that the drawing and fabrication process are suitable for the harder condition.
Buyers should also specify quantity, edge condition, protective film, flatness requirements and delivery destination where applicable.
Worthwill supplies 5052 mill finish aluminum sheet, plate and coil in H32, H34 and other specified tempers, subject to product dimensions and production availability.
Our general minimum order quantity for standard bulk aluminum products is approximately 3 metric tons. Prices are quoted according to the aluminum market, temper, dimensions, quantity and processing requirements rather than a fixed published FOB rate.
For a wider selection of grades and product forms, see our mill finish aluminum sheet and coil range.
Yes. For comparable sheet products, H34 has higher specified tensile and yield strength. However, the actual properties depend on the material specification, thickness and production lot.
Generally, yes. H32 offers more ductility and a better forming margin. H34 can still be bent, but tighter bends require more careful assessment of the radius, rolling direction and tooling.
Not inherently. Both tempers use the same 5052 alloy chemistry and have broadly comparable general corrosion resistance. The environment, surface treatment and fabrication details often matter more.
Not without verification and approval. Higher strength does not guarantee equivalent forming performance. The revised temper should be checked against the drawing, manufacturing process and relevant acceptance requirements.
It depends on the application. 5052-H32 generally provides higher strength and useful corrosion resistance, while 3003 in a suitable temper may offer easier forming and a more economical solution for less demanding applications.
For a direct alloy comparison, read our guide to 3003 vs 5052 aluminum sheet.
5052-H32 and 5052-H34 are not competing alloys. They are two material conditions that solve different fabrication problems.
H32 is usually the more practical starting point for bent and formed sheet-metal components. H34 is useful when higher yield strength and resistance to permanent deformation are needed, provided the forming process can accommodate its lower ductility.
Before ordering, consider the complete part—not just the material strength.
If you are sourcing 5052 aluminum sheet or coil, contact Worthwill Aluminum with your drawings, required temper, dimensions, quantity and application. We can review the material specification and available supply options before quotation.