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LORK is a special stainless steel manufacturer with 20 years of manufacturing experience.
904L stainless steel is a non-stabilized austenitic stainless steel with low carbon content. This high alloy stainless steel is added with copper to improve its resistance to strong reducing acids, such as sulphuric acid. The steel is also resistant to stress corrosion cracking and crevice corrosion. Grade 904L is non-magnetic, and offers excellent formability, toughness and weldability.
Grade 904L contains high amounts of expensive ingredients, such as molybdenum and nickel. Today, most of the applications that employ grade 904L are replaced by low-cost duplex stainless steel 2205.
Duplex Stainless 904L Applications
▪ Wiring in electrostatic precipitators
▪ Oil refinery components
▪ Seawater cooling devices
▪ Gas scrubbing plants
▪ Pulp and paper processing industries
▪ Acetic, phosphoric and sulphuric acid proc
| Grade | Reasons for choosing grade 904L |
| 316L | A lower cost alternative, but with much lower corrosion resistance. |
| 6Mo | A higher resistance to pitting and crevice corrosion is needed. |
| 2205 | A very similar corrosion resistance, with the 2205 having higher mechanical strength, and at a lower cost to 904L. (2205 not suitable for temperatures above 300°C.) |
| Super duplex | Higher corrosion resistance is needed, together with a higher strength than 904L. |
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Cu | |
| 904L | max. | 0.02 | 2 | 1 | 0.045 | 0.035 | 19-23 | 4-5 | 23-28 | 1-2 |
| Tensile strength Rm | 650 - 850 MPa |
| Yield point Rp0.2 | ≥ 300 MPa |
| Hardness | ≤ 260 HB |
| Elongation | ≥ 35% |
| Modulus of elasticity, E | 195 GPa |
| Density | 8.10 kg/dm³ |
| Annealing | 1050 - 1150ºC |
| 904L stainless steel plate sizes and specifications | |
| Grade | 904L |
| Cold rolled stainless steel plate | Thickness: 0.3mm- 16.0mm, Width: 1000mm - 2000mm, Length: as requirements, Surface: 2B/BA/SB/8K/HL/1D/2D etc |
| Hot rolled stainless steel sheet | Thickness: 3.0mm - 300mm, Width: 1000mm - 3000mm Length: as requirements, Surface: No.1/pickling |
| Standard | ASTM A240/A480, ASTM B688, ASTM B463/SB463, ASTM B168/SB168, ASTM B443/SB443/B424/SB424B625/SB625 B575/SB575, JIS G4303, BS 1449, DN17441, G4305 |
| Stainless steel plate | Thickness: 8.0mm - 300mm, Width: 1000mm - 3000mm Length: as requirements, Surface: No.1/pickling |
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