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：
Designed for environments with harsh corrosive conditions, 904L is a very low carbon content, highly alloyed austenitic stainless steel with better corrosion resistance than 316L and 317L, while balancing price and performance for a better price/performance ratio. Excellent corrosion resistance for reducing acids such as sulphuric and phosphoric acids due to the addition of 1.5% copper. It also has excellent resistance to stress corrosion, pitting and crevice corrosion caused by chloride ions, and has good resistance to intergranular corrosion. In the 0-98% concentration range of pure sulphuric acid, 904L can be used at temperatures of up to 40 degrees Celsius. In the 0-85% concentration range of pure phosphoric acid, its corrosion resistance is very good. In industrial phosphoric acid produced by the wet process, impurities have a strong influence on the corrosion resistance. In all types of phosphoric acid, 904L corrosion resistance is superior to that of ordinary stainless steel. In strongly oxidising nitric acid, 904L has lower corrosion resistance compared to highly alloyed steel grades without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range. 904L has better corrosion resistance than conventional stainless steels. 904L steel has a high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions is also good. The high nickel content of 904L reduces the rate of corrosion at pits and crevices. Ordinary austenitic stainless steels can be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 degrees C. By increasing the nickel content of the stainless steel, this sensitisation can be reduced. Due to the high nickel content, 904L has a high resistance to stress corrosion rupture in chloride solutions, concentrated hydroxide solutions and hydrogen sulphide-rich environments.
Application：
Petroleum, petrochemical equipment, such as reactors in petrochemical equipment, etc., storage and transport equipment for sulphuric acid, such as heat exchangers, etc., power plant flue gas desulphurisation equipment, the main parts used are: tower body, flue, stall door plate, internal parts of absorption towers, spray systems, etc., scrubbers and fans in organic acid treatment systems, seawater treatment devices, seawater heat exchangers, equipment for the paper industry, sulphuric acid and nitric acid equipment, acid making, pharmaceutical industrial and other chemical equipment, pressure vessels, food equipment, pharmaceutical plants: centrifuges, reactors, etc., plant food: soy sauce tanks, spirits, salt tanks, equipment and dressings, for dilute sulphuric acid strong corrosive media 904L is a matching steel grade.
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：
Designed for environments with harsh corrosive conditions, 904L is a very low carbon content, highly alloyed austenitic stainless steel with better corrosion resistance than 316L and 317L, while balancing price and performance for a better price/performance ratio. Excellent corrosion resistance for reducing acids such as sulphuric and phosphoric acids due to the addition of 1.5% copper. It also has excellent resistance to stress corrosion, pitting and crevice corrosion caused by chloride ions, and has good resistance to intergranular corrosion. In the 0-98% concentration range of pure sulphuric acid, 904L can be used at temperatures of up to 40 degrees Celsius. In the 0-85% concentration range of pure phosphoric acid, its corrosion resistance is very good. In industrial phosphoric acid produced by the wet process, impurities have a strong influence on the corrosion resistance. In all types of phosphoric acid, 904L corrosion resistance is superior to that of ordinary stainless steel. In strongly oxidising nitric acid, 904L has lower corrosion resistance compared to highly alloyed steel grades without molybdenum. In hydrochloric acid, the use of 904L is limited to a lower concentration of 1-2%. In this concentration range. 904L has better corrosion resistance than conventional stainless steels. 904L steel has a high resistance to pitting corrosion. Its resistance to crevice corrosion in chloride solutions is also good. The high nickel content of 904L reduces the rate of corrosion at pits and crevices. Ordinary austenitic stainless steels can be sensitive to stress corrosion in a chloride-rich environment at temperatures above 60 degrees C. By increasing the nickel content of the stainless steel, this sensitisation can be reduced. Due to the high nickel content, 904L has a high resistance to stress corrosion rupture in chloride solutions, concentrated hydroxide solutions and hydrogen sulphide-rich environments.
Application：
Petroleum, petrochemical equipment, such as reactors in petrochemical equipment, etc., storage and transport equipment for sulphuric acid, such as heat exchangers, etc., power plant flue gas desulphurisation equipment, the main parts used are: tower body, flue, stall door plate, internal parts of absorption towers, spray systems, etc., scrubbers and fans in organic acid treatment systems, seawater treatment devices, seawater heat exchangers, equipment for the paper industry, sulphuric acid and nitric acid equipment, acid making, pharmaceutical industrial and other chemical equipment, pressure vessels, food equipment, pharmaceutical plants: centrifuges, reactors, etc., plant food: soy sauce tanks, spirits, salt tanks, equipment and dressings, for dilute sulphuric acid strong corrosive media 904L is a matching steel grade.
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
