The high levels of chromium and nickel found in 304 and 316 stainless steel provides them with a strong resistance to heat, abrasion, and corrosion. Not only are they known for their resistance to corrosion, they are also known for their clean appearance and overall cleanliness.
The primary difference between 304 and 316 stainless steel fittings lies in their chemical composition, which influences their corrosion resistance and suitability for different applications.
1. Chemical Composition
304 Stainless Steel: Contains approximately 18% chromium and 8% nickel. This composition provides good corrosion resistance and overall strength but lacks added elements for extreme environments.
316 Stainless Steel: Contains around 16% chromium, 10% nickel, and 2-3% molybdenum. The molybdenum significantly enhances corrosion resistance, particularly against chloride ions.
2. Corrosion Resistance
304: Suitable for general-purpose environments, including low-salinity water, non-acidic chemicals, and indoor applications. However, it is less resistant to salt and acidic conditions.
316: Offers higher corrosion resistance, especially against salt water and acidic chemicals. This makes it ideal for marine environments, chemical processing, and pharmaceutical applications.
3. Cost
304: Generally less expensive due to the absence of molybdenum, making it more cost-effective for applications where high corrosion resistance is unnecessary.
316: Slightly more expensive due to the molybdenum content but is often the better choice for harsh environments, as it has a longer lifespan and requires less maintenance.
4. Applications
304: Commonly used in kitchen equipment, food processing, brewing, and dairy, where high resistance to everyday corrosion is sufficient.
316: Preferred for chemical processing, marine, medical, and pharmaceutical applications where exposure to chlorides or harsh chemicals is common.
In summary, 304 stainless steel fittings are suitable for general applications, while 316 stainless steel fittings are better for environments with high exposure to corrosive elements.
At QC Hydraulics, both 304 and 316 stainless steel hydraulic fittings are available to meet different customer’s requirements. Please contact our sales team for professional advice.