## Common ground
All options refer to iron wire made from different types of steel based on composition.
## Options at a glance
**7217 – Non-alloy steel**
- **Defining trait:** Made from plain iron or low-carbon steel without significant alloying elements.
- **Typical examples:** Wire for fencing, binding, basic construction ties.
- **Best fit when:** The wire is uncoated, not rust-resistant, and used in general-purpose applications.
**7223.00 – Stainless steel**
- **Defining trait:** Contains chromium (typically ≥10.5%) for corrosion resistance.
- **Typical examples:** Wire for kitchenware, medical tools, outdoor fixtures.
- **Best fit when:** The wire resists rust and is used in harsh or hygienic environments.
**7229 – Other alloy steel**
- **Defining trait:** Contains alloying elements (e.g., nickel, manganese, vanadium) for enhanced strength or hardness.
- **Typical examples:** Spring wire, high-tensile cables, automotive components.
- **Best fit when:** The wire is stronger or more durable than standard steel and used in demanding mechanical applications.
## Key differences
| Feature | 7217 (Non-alloy) | 7223.00 (Stainless) | 7229 (Alloy steel) |
|------------------|------------------|---------------------|--------------------|
| Corrosion resistance | Low | High | Medium to high |
| Alloy content | None or minimal | Chromium-rich | Significant additives |
| Typical use | General-purpose | Hygienic, outdoor | High-stress systems |
## How to choose
- Is the wire resistant to rust or corrosion? → 7223.00
- Does it contain added elements like nickel or vanadium for strength? → 7229
- Is it plain iron or low-carbon steel with no special coating or additives? → 7217
## Overlaps & pitfalls
A wire may appear stainless but still be classified under 7229 if it contains non-standard alloys. Conversely, some alloy steels may resist rust but lack sufficient chromium to qualify as stainless. If uncertain, prioritize the **main function**: use 7223.00 only for true corrosion-resistant applications; otherwise, classify by material composition