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904L is an austenitic stainless steel. Though notably softer than 316L, its molybdenum addition gives it superior resistance to localized attack (pitting and crevice corrosion) by chlorides and greater resistance reducing acids.
| Weight % | Cmax | Cr | Ni | Mo | Cu | PRENmin |
| 904L | 0.02 | 19.5-20.5 | 24.0-26.0 | 4.0-4.5 | 1.2-2.0 | 35 |
| EN 1.4539 | 0.02 | 19.0-21.0 | 24.0-26.0 | 4.0-45.0 | 1.2-2.0 | 35 |
| UNS N08904 | 0.02 | 19.0-23.0 | 23.0-28.0 | 4.0-5.0 | 1.2-2.0 | 35 |
| Material | Form and Condition | Tensile Strength MPa | Yield Strength (0.2% Offset) MPa | Elongation 4D(%) | Hardness HB | ||
| Ksi | MPa | Ksi | MPa | ||||
| 904L | Annealed | 490 | 220 | 35 | ≤ 150 HB | ||
| EN 1.4539 | Annealed | ||||||
| UNS N08904 | Annealed | - | |||||
| Pipe Seamless | ASTM A312 |
| Pipe Welded | ASTM A358,ASTM B673 |
| Tube Seamless | ASTM A269 |
| Tube Welded | EN 10217-7，EN 10296-2，ASTM A249，ASTM A269，ASTM B674 |
-Chloride containing environments
-Heat exchanger tubes
-Pipe systems within
-Chemical and Petrochemical
-Hydrometallurgy
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