Two Types of Stainless Steel: Differences in Composition
When comparing 304 and 201 stainless steel for door and window hardware based on composition, the key factors are nickel content (crucial for corrosion resistance), corrosion resistance (salt spray performance), strength and hardness (201 is slightly higher), and cost (price difference).
Industry experts note that the distinction lies primarily in nickel content and corrosion resistance: 304 (contains approx. 8–10% nickel, offers high corrosion resistance, suitable for coastal or high-end applications) versus 201 (low nickel content, lower cost, suitable for indoor or standard applications).
Selection should be based on the installation environment.
Differences Based on Composition
- Nickel content: High in 304 / Low in 201 (composition); affects corrosion resistance;
- Corrosion resistance: Salt spray resistance (304 is superior); key to preventing corrosion;
- Strength and hardness: 201 is slightly harder; the difference is minimal;
- Cost: 201 is cheaper; significant price difference;
- Suitable environments: Coastal vs. indoor;
matching material to the environment.
Selection Key Points
First, environmental suitability.
Match the material to the environment: use 304 for coastal or humid areas and 201 for indoor use to prevent rust and corrosion.
Second, verify corrosion resistance.
Use salt spray testing to verify performance and prevent the use of inferior materials.
Third, check markings.
Verify material markings (304/201) to avoid mixing up grades.
Fourth, weigh costs.
Evaluate the performance-to-cost ratio to make a sensible choice.
Pitfalls to Avoid
First, “passing off 201 as 304” (risk of corrosion); material testing is essential.
Second, “misleading labeling” (material mismatch);
verification is required.
Third, “environmental mismatch” (risk of corrosion);
ensure the material suits the environment.
Trends and Reminders
Door and window hardware is trending toward “high corrosion resistance,” characterized by the widespread adoption of 304 stainless steel (upgraded corrosion protection) and the use of nickel-free, eco-friendly alternatives (cost-effective substitutes).
Buyers are advised to prioritize “environmental suitability, corrosion resistance verification, and label verification.”
Distinguishing between 304 and 201 grades ensures a trouble-free purchasing process.
