## Common ground
All options refer to steel wire, differentiated by the type of steel used in manufacturing.
## Options at a glance
**7217 – Iron or non-alloy steel**
- **Defining trait:** Made from plain carbon steel without significant alloying elements.
- **Typical examples:** Fence wire, binding wire, basic construction reinforcement.
- **Best fit when:** The wire is used in general-purpose applications where corrosion resistance isn’t required.
**7223.00 – Stainless steel**
- **Defining trait:** Contains chromium (typically ≥10.5%) for high corrosion and heat resistance.
- **Typical examples:** Surgical instruments, food processing equipment, outdoor architectural fittings.
- **Best fit when:** The wire must resist rust, maintain hygiene, or endure harsh environments.
**7229 – Other alloy steel**
- **Defining trait:** Contains significant alloying elements (e.g., nickel, molybdenum, vanadium) for enhanced strength or hardness.
- **Typical examples:** Spring wire, high-tensile cables, automotive suspension components.
- **Best fit when:** The wire needs superior mechanical performance beyond standard steel.
## Key differences
| Feature | 7217 (Non-alloy) | 7223.00 (Stainless) | 7229 (Alloy) |
|---------------------|------------------|----------------------|--------------------|
| Corrosion resistance | Low | High | Moderate to high |
| Primary use | General purpose | Hygienic/harsh env. | High-stress apps |
| Alloying elements | None or minimal | Chromium only | Multiple (e.g., Ni, Mo) |
## How to choose
- Is the wire used in a corrosive environment (e.g., outdoors, food industry)? → 7223.00
- Does it need high strength or durability beyond standard steel? → 7229
- Is it plain carbon steel with no special coatings or additives? → 7217
## Overlaps & pitfalls
A wire may combine traits (e.g., stainless steel with alloying elements), but **7223.00 takes priority** if chromium content meets stainless criteria. If unsure, check material composition: stainless steel is defined by ≥10.5% Cr. Do not assume "stainless" means "alloy"—some alloy steels are not stainless