When it comes to fasteners, stainless steel is often the go-to material. Not only is stainless steel corrosion-resistant, but it also offers excellent durability and versatility. One type of stainless steel particularly sought for fasteners is the 904L grade. But what exactly is 904L stainless steel, and what makes it so special? This blog post explores the chemistry, properties, uses, and heat treatment of stainless steel 904L fasteners.
What are Stainless Steel 904L Fasteners?
904l Bolts are corrosion-resistant fastening systems with high strength and durability. They resist oxidation, are suitable for applications in harsh environments, and offer exceptional tensile strength. It is an austenitic grade of stainless steel with low carbon content and excellent weldability properties.
Stainless Steel 904L Fasteners Composition
904l Washer is an austenitic alloy that contains nickel, molybdenum, and chromium. It also has a higher percentage of nickel and molybdenum than most other austenitic stainless steels, making it extremely corrosion-resistant, particularly in aggressive environments containing chloride ions. Additionally, the 904l hex bolts contains a small amount of copper, which enhances its resistance to strong reducing acids such as sulfuric acid.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 904L | min. | – | – | – | – | – | 19.0 | 4.00 | 23.00 | 0.10 |
| max. | 0.20 | 2.00 | 1.00 | 0.045 | 0.035 | 23.0 | 5.00 | 28.00 | 0.25 | |
Stainless Steel 904L Fasteners Physical Properties
Regarding physical properties, Stainless Steel 904L Stud Bolts is similar to other austenitic stainless steels. It has a density of 8.05 g/cm³, a melting point of 1350-1390°C, and a specific heat capacity of 480 J/(kg·K). Its thermal conductivity is slightly lower than other austenitic grades but still high enough for many applications. The 904L grade also has a high electrical resistivity, making it suitable for electrical applications.
| Grade | Density (kg/m3) | Elastic Modulus (GPa) | Mean Coefficient of Thermal Expansion (m/m/0C) | Thermal Conductivity (W/m.K) | Specific Heat 0-1000C (J/kg.K) | Electrical Resistivity (n.m) | |||
| 0-1000C | 0-3150C | 0-5380C | at 1000C | at 5000C | |||||
| 904L | 8000 | 200 | 15.0 | – | – | 13.0 | – | 500 | 850 |
Stainless Steel 904L Fasteners Mechanical Properties
AISI 904L Bolts has excellent mechanical properties, including good tensile and yield strength, good elongation and reduction of area, and excellent hardness. It also has a low magnetic permeability, making it suitable for applications where magnetic interference can be an issue. The SS 904L Screws can be easily formed, welded, and machined using standard methods.
|
Grade
|
Yield Strength 0.2% Proof (MPa) min
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Elongation (% in 50mm) min
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Tensile Strength (MPa) min
|
Hardness
|
|
|
Brinell (HB) max
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Rockwell B (HR B) max
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||||
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904L
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220
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35
|
490
|
–
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70-90 typical
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Stainless Steel 904L Fasteners Equivalent
|
Grade
|
Yield Strength 0.2% Proof (MPa) min
|
Elongation (% in 50mm) min
|
Tensile Strength (MPa) min
|
Hardness
|
|
|
Brinell (HB) max
|
Rockwell B (HR B) max
|
||||
|
904L
|
220
|
35
|
490
|
–
|
70-90 typical
|
Stainless Steel 904L Fasteners Uses
SS 904L Screws is used in various applications, including chemical processing, pollution control equipment, the oil and gas industry, pharmaceuticals, and pulp and paper production. It is particularly suitable for use in harsh environments where other materials may fail due to corrosion. SS904L fasteners, in particular, are used in many industrial applications, including fastening piping systems, pressure vessels, and heat exchangers.
Stainless Steel 904L Fasteners Heat Treatment
SS 904L Nuts is hardened and strengthened by cold working, but it can also be heat treated to improve its properties. Annealing at temperatures between 1100-1250°C can improve the alloy’s resistance to intergranular corrosion. Solution annealing at 1090-1175°C followed by water quenching can enhance its mechanical properties.
Stainless Steel 904L Fasteners Corrosion Resistance
904L SS Bolts is highly corrosion-resistant in many environments, such as seawater, sulfuric acid, and chlorides. Its resistance to pitting and crevice corrosion is particularly exceptional. This is due to the high levels of nickel, chromium, and molybdenum, as well as the presence of copper. The alloy’s corrosion resistance can be further improved by adding small amounts of nitrogen, titanium, or niobium.
Conclusion:
SS 904L Fasteners is a high-performance austenitic alloy that offers exceptional resistance to corrosion and mechanical properties, making it an ideal material for many industrial applications. Its high nickel and molybdenum content provide excellent corrosion resistance, and the small amount of copper enhances its performance even further. The 904L grade also has good physical and mechanical properties, making it easy to process and work with. Overall, if you’re looking for a reliable, long-lasting, and highly resistant material for your fastening applications, stainless steel 904L is worth considering.
Meet Bhavesh, a seasoned blogger with a wealth of knowledge and experience. From metal products manufacturing to retail, Bhavesh has a diverse background in various industries and is dedicated to sharing his insights and expertise with readers.
