Aluminum sheet H14 vs H32 – which is harder?

When buying aluminum sheet, many people get stuck on the temper code: Aluminum sheet H14 vs H32 – which is actually harder? Behind this question, there is often a more important one: which one should I choose?

Let’s give the short answer first, then explain.

For the same alloy (for example, common 3003 aluminum), H14 is harder than H32.

Here are the numbers:  

– 3003-H14 has a Brinell hardness of about 40 HB  

– 3003-H32 has a Brinell hardness of about 36 HB  

That means H14 is about 10% harder than H32. The difference is small, but in real processing, the two tempers behave very differently – not just in hardness.

Where does the hardness of H14 and H32 come from?

Why does the same aluminum sheet have different hardness depending on the temper? The answer lies in the production path.

H14 is pure work-hardening. The sheet is cold-rolled, which squeezes the internal grains together, raising hardness and strength. No heat treatment follows. H14 is a half-hard temper. Think of it like metal that has been hammered – hard, but also a bit more brittle.

H32 goes through a certain amount of cold work, then a low-temperature stabilization treatment. This heat treatment slightly releases internal stress, letting the material “relax”. H32 corresponds to a quarter-hard temper – softer than H14, but tougher.

> In one sentence: H14 gets its hardness by “muscling through”, while H32 balances hardness with toughness.

More than hardness: full comparison of strength, ductility, and formability

Hardness alone is not enough. Users really need to see the overall performance. Here are the key indicators for 3003 aluminum:

The table shows clearly: H14 is harder and stronger, but H32 has better elongation and is less likely to crack during forming.

If your part needs bending, flanging, or light stamping, H32 often works better than you might expect.

Real applications: which temper for which job?

– 3003-H14 is often used for:  

  Fuel tanks, chemical equipment linings, cabinet panels, signs, and parts that need rigidity but simple forming.

– 3003-H32 is better for:  

  Marine components, pressure vessels, auto parts, architectural panels – wherever bending or moderate forming is required, H32 performs more reliably.

One more note: if you work with the 5000 series (like 5052), H32 is also very common. 5052-H32 reaches about 60 HB in hardness and over 230 MPa in tensile strength, widely used in marine engineering and auto body panels. This helps you understand: the same temper can perform very differently across different alloy series.

How to choose between H14 and H32? Three rules

1. Look at whether you need bending  

Need 90° bends, tight radii, or multi-step stamping? → Choose H32.  

Mainly flat cutting or simple shearing, and you want higher strength? → Consider H14.

2. Consider cracking risk  

H14 cracks more easily than H32 when the bend is tight or deformation is large. If your processing conditions are rough, H32 is safer.

3. When in doubt, pick H32  

As long as basic strength requirements are met, H32 offers more process flexibility and higher yield rates. Many shops get used to H32 and rarely use H14 for formed parts.

Three common mistakes

> Mistake 1: Thinking H32 is harder than H14  

> Many people see “32” bigger than “14” and assume H32 is harder. Actually, H32 is quarter-hard and H14 is half-hard – the numbers only indicate different work-hardening levels, not hardness ranking.

> Mistake 2: Using H14 for deep bending or stamping  

> H14 has only about 8% elongation. It is hard but brittle. For 90° bends, tight radii, or multi-step forming, H14 cracks very easily. Unless you plan to anneal it first, H32 is the safer choice.

> Mistake 3: Looking only at temper, ignoring the alloy  

> Comparing H14 and H32 only makes sense for the same alloy series. For example, 3003-H32 and 5052-H32 – both H32, but 5052 is much harder and stronger. Comparing H14 of one alloy with H32 of another alloy is meaningless and leads to wrong choices.

FAQ

– Q: How much harder is 3003 H14 than H32?  

– A: About 10% – 40 HB vs 36 HB.

– Q: Which temper bends without cracking?  

– A: H32 – its stabilization treatment improves formability.

– Q: Can both H14 and H32 be welded?  

– A: Yes, but the heat-affected zone will lose some strength.

– Q: What is the single most important factor when choosing between H14 and H32?  

– A: Whether your part needs bending or stamping – if yes, choose H32; if mainly flat work with high hardness, choose H14.

– Q: Does Mingtai Aluminum supply reliable H14 and H32 sheets?  

– A: Mingtai Aluminum offers full-range H14 and H32 sheets with consistent quality for various fabrication needs.

That completes the full comparison of Aluminum sheet H14 vs H32. Keep one rule in mind – “look at forming requirements first, then decide hardness” – and you won’t go wrong.