904L stainless steel is an austenitic stainless steel containing a high proportion of alloy elements. It is mainly composed of 18% chromium (Cr), 23% nickel (Ni) and 4.5% molybdenum (Mo). Its special chemical composition makes it It has many advantages in terms of corrosion resistance and mechanical properties. The following are the main advantages of 904L stainless steel:
1. Excellent corrosion resistance
Resistant to chloride stress corrosion cracking: 904L stainless steel contains a higher proportion of nickel and molybdenum elements, which significantly improves the resistance to chloride-induced stress corrosion cracking (SCC), especially suitable for seawater, chemical processing and petrochemical industries environment.
Resistance to pitting and pitting corrosion: The addition of molybdenum gives 904L stainless steel excellent resistance to pitting and pitting corrosion, especially in acidic or corrosive environments containing chloride ions.
Acid corrosion resistance: 904L stainless steel has high corrosion resistance in strong acidic environments such as sulfuric acid, phosphoric acid, and chloric acid. It is more durable than ordinary 304 or 316 stainless steel and is suitable for the storage and transportation of acidic chemicals.
2. Higher heat resistance
904L stainless steel has good oxidation resistance in high temperature environments, can withstand higher temperature oxidizing media, and is suitable for thermal processing and high temperature working environments.
3. Excellent mechanical properties
High strength: Although 904L stainless steel has a high content of alloying elements, it still maintains good strength and hardness and is suitable for applications that can withstand greater loads and pressures.
Good plasticity and formability: 904L has good processability, is easy to process in various forming processes, and is suitable for manufacturing parts with complex shapes.
4. Good welding performance
904L stainless steel can maintain good welding performance under various welding conditions. It will not show defects such as brittleness or cracks after welding. It requires almost no post-processing after welding, so it is also very suitable for engineering applications that require high welding performance.
5. High temperature oxidation resistance
904L has better high temperature oxidation resistance than 304 and 316. It is capable of operating at higher temperatures for extended periods of time without suffering oxidative damage, making it suitable for applications in high-temperature environments.
6. Adapt to harsh environments
904L stainless steel is widely used in petrochemical, pharmaceutical, seawater treatment, pulp and papermaking and other industries, and can be used for a long time under extremely harsh environmental conditions (such as high-concentration sulfuric acid, hydrogen chloride and other corrosive media).
7. Resistant to seawater corrosion
Due to its high molybdenum and nickel content, 904L stainless steel has excellent resistance to chloride corrosion in seawater and is often used in marine engineering and equipment manufacturing in marine environments, such as seawater pumps, offshore platforms, seawater pipelines, etc. .
8. Low carbon content
The low carbon content of 904L stainless steel makes it more stable at high temperatures, reduces carbide precipitation during the welding process, and reduces the risk of intergranular corrosion.
In general, 904L stainless steel has become the material of choice in many fields that require long-term corrosion resistance, high temperature resistance and harsh environments due to its excellent corrosion resistance, heat resistance and mechanical properties.
