## Common ground
Both options refer to structural steel shapes made from iron or non-alloy steel, specifically U-shaped profiles used in construction and engineering.
## Options at a glance
**7216 – Angles, shapes and sections of iron or non-alloy steel**
- **Defining trait:** Made specifically from iron or non-alloy steel (carbon steel without alloying elements).
- **Typical examples:** U-sections, I-beams, angle bars made from plain carbon steel.
- **Best fit when:** The product is made of unalloyed steel (e.g., S235, SS400) and not heat-treated or alloyed.
**7222.40 – Angles, shapes and sections**
- **Defining trait:** Broader category covering all types of structural shapes, including those made from alloyed or stainless steel, and may include non-iron materials.
- **Typical examples:** U-sections, channels, angles made from stainless steel, high-strength alloy steel, or other metals.
- **Best fit when:** The product is not plain carbon steel (e.g., stainless, weathering, or alloyed steel), or if the material is unspecified.
## Key differences
| Feature | 7216 – Iron/non-alloy steel | 7222.40 – General shapes |
|--------------------------|-----------------------------------|-----------------------------------|
| Material focus | Only iron or non-alloy steel | All materials (including alloys) |
| Specificity | High | Low (broad category) |
| Applicability | Plain carbon steel only | Any structural shape, any material|
## How to choose
- Is the U-section made of plain carbon steel (no alloying elements)? → 7216
- Is it stainless steel, weathering steel, or alloyed? → 7222.40
## Overlaps & pitfalls
A U-section made of non-alloy steel fits both codes, but **7216 takes priority** when the material is plain carbon steel. The term "shapes and sections" in 7222.40 is vague and includes all types, so it should only be used if the product does not qualify under 7216. If unsure, prioritize the more specific code (7216) for non-alloy steel