**1. Which steel is better, 204 or 304?**
Stainless Steel 304 is generally considered better than Stainless Steel 204 for most applications. The key difference is in their composition: SS 304 contains a higher percentage of nickel (8-10.5%), while SS 204 contains less nickel and often uses manganese instead. This makes SS 304 significantly more corrosion-resistant, more durable, and easier to form and weld. SS 204 is a lower-cost alternative designed to be a budget substitute for SS 304, but it will not perform as well in corrosive environments.
**2. What is the price of SS 204 steel per kg?**
The price of stainless steel is highly volatile and depends on the global prices of its raw materials (like nickel and chromium), the form of the product (sheet, coil, bar), and your geographical location. As a general guideline, SS 204 is typically **20-30% cheaper than SS 304** due to its lower nickel content. For a precise, real-time price, you must contact local steel suppliers or distributors directly.
**3. Which steel grade is better, 202 or 304?**
Stainless Steel 304 is better than Stainless Steel 202. Similar to the 204 vs. 304 comparison, the main difference is the nickel content. SS 304 has 8-10.5% nickel, granting it superior corrosion resistance and formability. SS 202 has a lower nickel content (around 4-6%) and uses more manganese and nitrogen, making it less resistant to rust and pitting, especially in harsh environments. SS 304 is the industry standard for a reason, while SS 202 is again a more economical, but less capable, alternative.
**4. How can I tell if my stainless steel is 304 or 202?**
Distinguishing between 304 and 202 by sight alone is very difficult. However, you can use these methods:
* **Magnet Test:** Both grades are generally non-magnetic or only very slightly magnetic. This test is not reliable for telling them apart.
* **Chemical Test Kits:** The most accurate method without lab equipment is to use a drop test kit that identifies the presence of molybdenum (which neither has) or measures nickel content. A kit that shows low nickel would suggest 202.
* **Spark Test (for experienced personnel):** A grinder can be used. SS 304 tends to have shorter, less sparky streaks than carbon steel, but telling it from 202 requires a trained eye and is not definitive.
* **Environment Observation:** If the steel shows signs of rust or pitting in a mildly corrosive environment (like a kitchen or outdoors), it is more likely to be SS 202. SS 304 is highly resistant to such conditions.
* **Supplier Documentation:** The most reliable method is to check the mill test certificate from your supplier.
**5. Is 304 stronger than 316?**
No, in terms of yield and tensile strength at room temperature, Stainless Steel 304 and 316 have very similar mechanical strength; they are nearly identical in this regard. The key difference is not strength but **corrosion resistance**. SS 316 contains 2-3% molybdenum, which makes it dramatically more resistant to chlorides and acids (like salt water and many chemicals) than SS 304. So, while 316 isn't significantly "stronger," it is far superior for harsh marine and industrial chemical environments.
