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• Stainless Steel Grade
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• Grease Interceptor / Oil Interceptor
Type of Stainless Steel Comparison
1. SUS 202 – Non Magnetic
. 4% nickel alloy.
. Bad resistance to corrosion and oxidation as compared to SUS 304 and SUS 439
2. SUS 304 – Non Magnetic
. 8% nickel, 18% chromium alloy, No titanium content.
. Excellent resistance to stress cracking.
. Good resistance to corrosion.
. Good oxidation resistance.
. Good weldability.
3. SUS 316 – Slightly magnetic after forming
. Highly corrosion resistance
4. SUS 439 - Magnetic
. A Titanium stabilized, 18% chromium alloy. No nickel content.
. Excellent resistance to stress cracking.
. Good resistance to corrosion.
. Good oxidation resistance.
. Good weldability.
. High thermal conductivity coefficient.
. Low thermal expansion coefficient.
5. SUS 444 – Magnetic
. Equal in corrosion resistance to SUS 316.
Test Result-Comparison SUS 304 and SUS 439
1. Typical Chloride Stress Cracking test results in boiling solutions
| Alloy | 42%MgC | 33%LiCI | 26%NaCI |
| SUS 304 | 20 hours | 96 hours | 744 hours |
| SUS 316 | 21 hours | 21 hours | 1000 hours |
| SUS 439 | 1000 hours | 1000 hours | 1000 hours |
Conclusion : SUS 439 Seems to have better chloride stress cracking resistance as compared to SUS 304 and SUS 316.
2. Typical General Corrosion (Rusty) Data
| Boiling Solution |
|
|||||
| 20% Phosphoric Acid | 0.0002(0.006) | 0.0002(0.006) | ||||
| 10% Sodium Bisulfate | 0.0001(0.003) | 0.005(1.53) | ||||
| 10% Sulfamic Acid | 0.0008(0.025) | 0.013(4.0) | ||||
Conclusion: SUS 439 appears to have better corrosion (rusty) resistance as compared to SUS 304 at the above mentioned boiling solutions.
LAKASA commitment to deliver Good Quality Products & 1 Year Warranty on material welding defects
Stainless steel 439, 304, 444 and 316 are proved good and suitable for fabrication of Water Tanks and Interceptors and thus are among our material options. Stainless steel 202 (non magnetic), is relatively weak and bad resistance to corrosion and oxidation as compared to SUS 439, 304, 444 and 316. As such, SUS202 is excluded from the list of our choices.
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