440A is the lowest-carbon member of the 440 family. It is used for budget folders and some kitchen knives.
440A Steel at a Glance
| Type | Stainless steel |
|---|---|
| Made by | Many mills (AISI 440A) |
| Typical hardness | 55-58 HRC |
| Key elements | Carbon about 0.65 to 0.75%, chromium 16 to 18%, molybdenum up to 0.75% |
| Edge retention | 2/10 (low) |
| Toughness | 5/10 (good) |
| Rust resistance | 8/10 (very good) |
| Ease of sharpening | 8/10 (easy) |
| Best for | Budget folders |
Ratings are relative 1 to 10 scores for typical factory heat treatments. See how 440A ranks against 46 other steels in our Knife Steel Chart.
What Is 440A Steel?
440A has high chromium for strong corrosion resistance, but less carbon than 440C, so it is softer and holds an edge for less time.
440A Steel Properties
- Edge retention: Low.
- Toughness: Good.
- Rust resistance: Very good.
- Ease of sharpening: Easy.
440A Equivalents and Alternatives
7Cr17MoV is a close Chinese equivalent. AUS-6 is similar in performance.
440A vs Other Steels
440A vs 440C
Compared with 440C, 440A is slightly tougher, resists rust slightly better and is easier to sharpen. 440C holds an edge longer. Read our 440C guide.
440A vs 7Cr17MoV
Compared with 7Cr17MoV, 440A resists rust slightly better. 7Cr17MoV holds an edge slightly longer. Read our 7Cr17MoV guide.
440A vs 420HC
Compared with 440A, 420HC is slightly tougher and is slightly easier to sharpen. Read our 420HC guide.
Is 440A Steel Good for Knives?
Yes, for budget knives where rust resistance matters more than edge holding.
Pros:
- Very good rust resistance
- Easy to sharpen
- Cheap
Cons:
- Modest edge retention
Knives That Use 440A Steel
Makers sometimes change blade steels between versions, so check the listing to confirm the steel before you buy.
Frequently Asked Questions
Is 440A steel stainless?
Yes. 440A is a stainless steel, though no knife steel is completely rust proof. Wipe it dry after use.
How hard is 440A steel?
Knives in 440A are usually heat treated to around 55-58 HRC.
Is 440A easy to sharpen?
Easy. Most standard stones and pull-through sharpeners work.