Background
904L is a non-stabilised low carbon high alloy austenitic stainless steel. The addition of copper to this grade gives it greatly improved resistance to strong reducing acids, particularly sulphuric acid. It is also highly resistant to chloride attack - both pitting / crevice corrosion and stress corrosion cracking.
This grade is non-magnetic in all conditions and has excellent weldability and formability. The austenitic structure also gives this grade excellent toughness, even down to cryogenic temperatures.
904L does have very substantial contents of the high cost ingredients nickel and molybdenum. Many of the applications in which this grade has previously performed well can now be fulfilled at lower cost by duplex stainless steel 2205 (S31803 or S32205), so it is used less commonly than in the past.
Product specification
Range:
0.5 mm To 200 mm thick in 1000 mm TO 2500 mm width & 2500 mm to 12500 mm Length available with NACE MR 01-75.
Composition
Table 1. Composition ranges for 904L grade of stainless steels.
Grade | C | Mn | Si | P |
| Cr | Mo | Ni | Cu | |
904L | min. max. | - 0.020 | - 2.00 | - 1.00 | - 0.045 | - 0.035 | 19.0 23.0 | 4.0 5.0 | 23.0 28.0 | 1.0 2.0 |
| Place of Origin | Not Given |
| Minimum Order Quantity | Not Given |
| Supply Ability | Not Given |
| Packaging Details | Not Given |
| Delivery Details | Not Given |
