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Conventional stainless steels such as 304L and 316L are susceptible to chloride stress corrosion cracking (SSC) under certain conditions. Resistance to SSC increases with the increased content of nickel and molybdenum. Therefore, the higher performance austenitic stainless steels such as 904L have very good resistance to SSC. High performance austenitic steels and duplex stainless steels clearly outperform 316L.
Alloy 904L Steel Chemical Analysis:
| Nickel | 23.0 min.-28.0 max. | Silicon | 1.00 |
| Chromium | 19.0 min.-23.0 max. | Phosphorus | 0.045 |
| Molybdenum | 4.0 min.-5.0 max. | Sulfur | 0.035 |
| Copper | 1.0-2.0 max. | Iron | Balance |
| Manganese | 2.00 |
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Alloy 904L Steel Mechanical Properties:
| Yield Strength | Ultimate Tensile | Elongation | Hardness | ||
| psi (min.) | (MPa) | psi (min.) | (MPa) | % (min.) | (max.) |
| 31,000 | 220 | 71,000 | 490 | 36 | 70-90 Rockwell B |
904L is quite ductile and forms easily. The addition of molybdenum and nitrogen implies more powerful processing equipment may be necessary when compared with the standard 304/304L grades.
The high content of alloying elements in 904L gives the alloy exceptionally good resistance to uniform corrosion.
Address: Zhengzhou city in China.
Phone: 0086-371-86151827
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