904L 1.4539 UNS N08904 Hex Head Bolt ,Hex Cap Screw
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What is SS 904L?
Alloy 904L (UNS N08904) is a superaustenitic stainless steel designed for corrosion and pitting resistance in a wide range of process environments. It is used extensively in the chemical process industry including the production of phosphate-based fertilizers.
Grade 904L stainless steels have excellent resistance to warm seawater and chloride attack. The high resistance of grade 904L against stress corrosion cracking is due to the presence of high amounts of nickel in its composition. Moreover, the addition of copper to these grades develops resistance to sulphuric acid and other reducing agents in both aggressive and mild conditions.
The corrosion resistance of grade 904L is intermediate between super austenitic grades, with 6% molybdenum content, and standard 316L austenitic grades. Grade 904L is less resistant to nitric acid than grades 304L and 310L, which are free of molybdenum. This steel grade needs to be solution treated following cold working, to achieve maximum stress corrosion cracking resistance under critical environments.
corrosion resistant alloy 904L Equivalent material
| UNS | AISI/ASME | ID | W.Nr |
| NO8904 | 904L | F904L | 1.4539 |
Chemical composition of corrosion resistant alloy 904L
| Alloy | % | Ni | Cd | Mo | Cu | Fe | C | Mn | Cu | S |
| 904L | Min. | 24 | 19 | 4 | 1 | Bal | ||||
| Max. | 26 | 21 | 5 | 2 | 0.02 | 2 | 0.03 | 0.015 |
Physical properties of corrosion resistant alloy 904L
| Density | 8.0 g/cm³ |
| Melting point | 1300~1390 ºC |
Minimum value of mechanical properties of corrosion resistant alloy 904L at room temperature
| Tensile strengthRm N/mm² | Yield strength
RP0.2 N/mm² |
Elongation
A 5 % |
| 490 | 215 | 35 |
A 904L hex bolt is a fastener made from ASTM B649 UNS N08904 stainless steel, known for its high corrosion resistance, especially in acidic and chloride-rich environments. It is widely used in marine, chemical, and offshore applications.
Standard specifications for 904L Hex Bolts
-
DIN 933 / DIN 931 – Hex bolts with full or partial threading
- ASME B18.2.1
-
ISO 4014 / ISO 4017 – International standard hex bolts
Size Range: M6 to M100 (¼” to 4”)
Thread Type: UNC / UNF / Metric
Length Options: Standard & Custom lengths available
FAQ – 904L Hex Bolts
1. What are 904L Hex Bolts?
904L hex bolts are high-performance stainless steel fasteners made from UNS N08904 (ASTM B649). They provide exceptional corrosion resistance, especially in acidic, chloride-rich, and high-temperature environment
2. Application of 904L Hex Bolts?
Some of the major applications of grade 904L stainless steels include:
- Wiring in electrostatic precipitators
- Oil refinery components
- Seawater cooling devices
- Gas scrubbing plants
- Pulp and paper processing industries
- Acetic, phosphoric and sulphuric acid processing plants
