English 
Origin of Product：
Nippon Steel / Nippon Metallurgy / Otokunpu, Sweden
Standard：
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312, ASTM B625/ASME B625, ASTM B673/ASME B673
904L, Al-904L, UNS N08904 SUS890L, F904L, W.-Nr. 1.4539, NAS 255, 00Cr20Ni25Mo4.5Cu
Chemical Compositions:
% | Fe | Cr | Ni | Mo | C | Mn | Si | P | S | Cu |
MIN. | Surplus | 19.0 | 23 | 4.0 | 1.00 | |||||
MAX. | 23.0 | 28 | 5.0 | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 2.00 |
Physical Properties:
Density | 8.06 g/cm3 |
Melting Point | 1300-1390℃ |
Magnetism | None |
Mechanical Properties:
Tensile Strength: σb≥490Mpa
Yield Strength σb≥215Mpa
Elongation: δ≥35%
Hardness: 70-90 (HRB)
Corrosion Resistance：
Engineered for use in environments characterized by severe corrosive conditions, 904L is a highly alloyed austenitic stainless steel with a very low carbon content, offering superior corrosion resistance compared to both 316L and 317L. This material effectively balances price and performance, resulting in an advantageous price/performance ratio. The inclusion of 1.5% copper enhances its excellent resistance to reducing acids, such as sulphuric and phosphoric acids. Moreover, 904L demonstrates remarkable resilience against stress corrosion, pitting, and crevice corrosion induced by chloride ions, alongside commendable resistance to intergranular corrosion. When exposed to pure sulphuric acid within the concentration range of 0-98%, 904L can withstand temperatures of up to 40 degrees Celsius. Its corrosion resistance in the 0-85% concentration range of pure phosphoric acid is also notably high. However, in industrial phosphoric acid produced through the wet process, the presence of impurities significantly impacts corrosion resistance. Across all forms of phosphoric acid, 904L exhibits superior corrosion resistance in comparison to standard stainless steels. Conversely, in strongly oxidizing nitric acid, 904L's corrosion resistance is inferior to that of highly alloyed steel grades that lack molybdenum. Additionally, its application in hydrochloric acid is restricted to lower concentrations of 1-2%, within which 904L outperforms conventional stainless steels in terms of corrosion resistance. 904L steel exhibits significant resistance to pitting corrosion and demonstrates commendable resilience against crevice corrosion in chloride solutions. The elevated nickel content present in 904L effectively diminishes the corrosion rate at both pits and crevices. In contrast, standard austenitic stainless steels may experience sensitivity to stress corrosion when exposed to chloride-rich environments at temperatures exceeding 60 degrees Celsius. However, by enhancing the nickel content within the stainless steel, this sensitization can be mitigated. Owing to its high nickel composition, 904L steel possesses notable resistance to stress corrosion rupture in environments characterized by chloride solutions, concentrated hydroxide solutions, and hydrogen sulfide.
Application：
The equipment utilized in the petroleum and petrochemical sectors includes reactors, storage and transportation systems for sulfuric acid such as heat exchangers, and flue gas desulfurization apparatus for power plants. Key components in these systems comprise the tower body, flue, access door plates, internal structures of absorption towers, and spray systems, along with scrubbers and fans used in organic acid treatment processes. Additionally, seawater treatment devices, seawater heat exchangers, equipment for the paper industry, and apparatus for sulfuric and nitric acid production are essential. Other relevant machinery encompasses pressure vessels, food processing equipment, and pharmaceutical manufacturing tools such as centrifuges and reactors. In the food sector, there are specialized tanks for soy sauce, spirits, and salt, while for handling strong corrosive media like dilute sulfuric acid, the appropriate steel grade is 904L.
Matching Welding Consumables：
ER385 wire and E385 electrode are used for welding 904L, with sizes Φ1.6, 2.4, 2.5, 3.2, 4.0
Supply Style：
Plate, strip, bar, wire, forgings, light bars, welding consumables, flanges, etc., as per the drawing
Origin of Product：
Nippon Steel / Nippon Metallurgy / Otokunpu, Sweden
Standard：
ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312, ASTM B625/ASME B625, ASTM B673/ASME B673
904L, Al-904L, UNS N08904 SUS890L, F904L, W.-Nr. 1.4539, NAS 255, 00Cr20Ni25Mo4.5Cu
Chemical Compositions:
% | Fe | Cr | Ni | Mo | C | Mn | Si | P | S | Cu |
MIN. | Surplus | 19.0 | 23 | 4.0 | 1.00 | |||||
MAX. | 23.0 | 28 | 5.0 | 0.020 | 2.00 | 1.00 | 0.045 | 0.035 | 2.00 |
Physical Properties:
Density | 8.06 g/cm3 |
Melting Point | 1300-1390℃ |
Magnetism | None |
Mechanical Properties:
Tensile Strength: σb≥490Mpa
Yield Strength σb≥215Mpa
Elongation: δ≥35%
Hardness: 70-90 (HRB)
Corrosion Resistance：
Engineered for use in environments characterized by severe corrosive conditions, 904L is a highly alloyed austenitic stainless steel with a very low carbon content, offering superior corrosion resistance compared to both 316L and 317L. This material effectively balances price and performance, resulting in an advantageous price/performance ratio. The inclusion of 1.5% copper enhances its excellent resistance to reducing acids, such as sulphuric and phosphoric acids. Moreover, 904L demonstrates remarkable resilience against stress corrosion, pitting, and crevice corrosion induced by chloride ions, alongside commendable resistance to intergranular corrosion. When exposed to pure sulphuric acid within the concentration range of 0-98%, 904L can withstand temperatures of up to 40 degrees Celsius. Its corrosion resistance in the 0-85% concentration range of pure phosphoric acid is also notably high. However, in industrial phosphoric acid produced through the wet process, the presence of impurities significantly impacts corrosion resistance. Across all forms of phosphoric acid, 904L exhibits superior corrosion resistance in comparison to standard stainless steels. Conversely, in strongly oxidizing nitric acid, 904L's corrosion resistance is inferior to that of highly alloyed steel grades that lack molybdenum. Additionally, its application in hydrochloric acid is restricted to lower concentrations of 1-2%, within which 904L outperforms conventional stainless steels in terms of corrosion resistance. 904L steel exhibits significant resistance to pitting corrosion and demonstrates commendable resilience against crevice corrosion in chloride solutions. The elevated nickel content present in 904L effectively diminishes the corrosion rate at both pits and crevices. In contrast, standard austenitic stainless steels may experience sensitivity to stress corrosion when exposed to chloride-rich environments at temperatures exceeding 60 degrees Celsius. However, by enhancing the nickel content within the stainless steel, this sensitization can be mitigated. Owing to its high nickel composition, 904L steel possesses notable resistance to stress corrosion rupture in environments characterized by chloride solutions, concentrated hydroxide solutions, and hydrogen sulfide.
Application：
The equipment utilized in the petroleum and petrochemical sectors includes reactors, storage and transportation systems for sulfuric acid such as heat exchangers, and flue gas desulfurization apparatus for power plants. Key components in these systems comprise the tower body, flue, access door plates, internal structures of absorption towers, and spray systems, along with scrubbers and fans used in organic acid treatment processes. Additionally, seawater treatment devices, seawater heat exchangers, equipment for the paper industry, and apparatus for sulfuric and nitric acid production are essential. Other relevant machinery encompasses pressure vessels, food processing equipment, and pharmaceutical manufacturing tools such as centrifuges and reactors. In the food sector, there are specialized tanks for soy sauce, spirits, and salt, while for handling strong corrosive media like dilute sulfuric acid, the appropriate steel grade is 904L.
Matching Welding Consumables：
ER385 wire and E385 electrode are used for welding 904L, with sizes Φ1.6, 2.4, 2.5, 3.2, 4.0
Supply Style：
Plate, strip, bar, wire, forgings, light bars, welding consumables, flanges, etc., as per the drawing
