What are the key differences between 1100 H14, H18, and O tempers?
The H14 temper is strain-hardened to a 1/2-hard condition, balancing strength and formability, while H18 is fully hard with higher strength but reduced ductility. The O temper (annealed) is the softest state, optimized for deep drawing or bending. H14 has ~10% elongation vs. H18's ~5%, making H14 better for moderate forming. O temper sheets are used where maximum malleability is required. All share AA1100's 99%+ purity but differ in mechanical properties.
What applications suit 1100 H14 Aluminium Sheet?
Common uses include decorative trim, lighting reflectors, and chemical equipment linings due to its corrosion resistance. Its moderate strength works for HVAC components and food packaging. The temper's formability allows for stamped or spun parts. It's also chosen for architectural panels where slight shaping is needed. Unlike H18, it avoids cracking during complex bends.
Why select 1100 H18 for industrial flooring or truck beds?
The H18 temper's high hardness (Brinell ~35 HB) resists abrasion from heavy loads. Its tensile strength (~150 MPa) outperforms H14 in structural applications. The surface withstands impacts without denting easily. However, welding requires preheating to prevent brittleness. It's less formable than H14 but ideal for flat, load-bearing surfaces.
How does 1100 O temper support deep-drawing processes?
The annealed state (O temper) offers elongation up to 35%, permitting extreme deformation without cracking. It's used for kitchen utensils, cans, and capacitor shells. The absence of strain hardening ensures uniform material flow. Post-forming, heat treatment can restore hardness if needed. Its low yield strength (~35 MPa) minimizes tool wear during pressing.
What are the corrosion resistance properties of 1100 series sheets?
All tempers (H14/H18/O) inherit excellent corrosion resistance from 99% aluminum content. They form a protective oxide layer, suitable for marine or chemical exposures. Anodizing further enhances durability for harsh environments. Unlike alloyed sheets, 1100 won't galvanically corrode when paired with other metals. Regular cleaning prevents pitting from salt or pollutants.
