904L Corrosion Resistant Steel
Gnee Steel
Advantages of 904L Corrosion Resistant Steel
904L stainless steel offers excellent resistance to pitting, crevice, and general corrosion, making it particularly suitable for aggressive environments such as acids, chlorides, and saltwater, thanks to its high molybdenum, nickel, and chromium contents. It also exhibits excellent weldability and formability, retains strength at both high and low temperatures, and provides a long service life in demanding applications such as chemical processing, oil and gas, and the marine industry.
Gnee Steel
What are the benefits of using 904L steel?
The advantages and benefits of 904L stainless steel are as follows:
Excellent corrosion resistance, especially suitable for harsh environments.
High resistance to acid corrosion, including sulfuric and phosphoric acids.
High resistance to pitting and crevice corrosion.
Excellent durability at both high and low temperatures.
Applications of 904L Stainless Steel
| Industry | Application |
| Chemical Processing | Heat exchangers, Tanks, Piping systems, Valves |
| Oil and Gas | Offshore platforms, Pipelines, Pumps, Wellhead equipment |
| Pharmaceutical | Mixing tanks, Sterilizers, Process reactors, Storage vessels |
| Power Generation | Flue gas scrubbers, Nuclear waste containers, Turbine blades, Cooling systems |
Advantages and Disadvantages of 904L Stainless Steel
The advantages and benefits of 904L stainless steel are as follows:
Excellent corrosion resistance, especially for harsh environments.
Resistant to acid attack, including sulfuric and phosphoric acids.
Resistant to pitting and crevice corrosion.
Excellent durability at both high and low temperatures.
Good weldability and formability, suitable for a wide range of applications.
The disadvantages and limitations of 904L stainless steel are as follows:
Higher cost compared to other stainless steel grades.
Due to its high strength and toughness, it can be difficult to machine.
Specialized tools are required for welding and fabrication.
Limited supply compared to more common stainless steel grades.
Heavy weight may limit its use in some applications.
Equivalent Grades of 904L Stainless Steel
| Country/Region | Standard | Equivalent Grade |
| EU | EN 10088-1 | X1NiCrMoCu25-20-5 (1.4539) |
| USA | ASTM A240 | 904L, N08904 |
| France | NF A35-576 | Z2NCDU25-20 |
| England | BS 1449 | 904S13 |
| Sweden | SS 14 25 62 | 2562 |
| Poland | PN 67/H-86020 | 00H22N24M4TCu |
Heat and Corrosion Resistance of 904L Stainless Steel
Heat Resistance
904L stainless steel has good heat resistance and performs well at temperatures up to 400°C (752°F). However, it is not suitable for long-term use at higher temperatures. Above 400°C, its strength and corrosion resistance decrease. While 904L resists oxidation, it is more suitable for corrosion protection rather than extreme high-temperature environments.
Corrosion Resistance
904L stainless steel has excellent corrosion resistance. Its high molybdenum content provides excellent protection against pitting and crevice corrosion, especially in chloride-rich environments. The addition of copper enhances its corrosion resistance in all concentrations of sulfuric acid, making it superior to many other stainless steels in this regard.
While 904L is more resistant to chloride stress corrosion cracking than other austenitic stainless steels, it remains susceptible to corrosion at high temperatures or in high chloride concentrations. Its low carbon content also minimizes the risk of intergranular corrosion during welding, making it an ideal choice for applications where both corrosion resistance and weldability are critical, such as chemical processing and seawater environments.
Chemical Composition of 904L Stainless Steel
Check the table below for the chemical composition of 904L stainless steel:
| Element | Carbon, C | Chromium, Cr | Copper, Cu | Iron, Fe | Manganese, Mn | Molybdenum, Mo | Nickel, Ni | Silicon, Si | Sulfur, S |
| Wt% | ≤ 0.020 % | 19 – 23 % | 1.0 – 2.0 % | 38.9 – 53 % | ≤ 2.0 % | 4.0 – 5.0 % | 23 – 28 % | ≤ 1.0 % | ≤ 0.035 % |
Characteristics of 904L Stainless Steel
904L stainless steel is unique in three key areas:
It offers exceptional corrosion resistance in corrosive environments such as seawater and acidic environments.
It exhibits exceptional toughness and durability even at low temperatures.
It also offers excellent weldability and formability, making it suitable for complex industrial applications.
Gnee Steel specializes in the production and sale of a wide range of stainless steel products, including 304, 316, 321, 904, 904L, 2205 Duplex, 2205 Duplex, and 316L stainless steel. Gnee Steel's products are widely used in the kitchen, aerospace, chemical, power, automotive, and nuclear energy sectors. We also provide custom stainless steel solutions tailored to customer needs. For stainless steel pricing or custom alloy solutions, please email ru@gneesteelgroup.com for a quote.
