SS904L
SS904L is a high-alloy, low-carbon austenitic stainless steel containing elevated nickel and molybdenum plus copper. It provides improved resistance to reducing acids and chloride-induced localized corrosion compared with standard 300-series grades.
SS904L Grade Information
SS904L is a high-alloy, low-carbon austenitic stainless steel containing elevated nickel and molybdenum plus copper. It provides improved resistance to reducing acids and chloride-induced localized corrosion compared with standard 300-series grades.
Legacy British standard for stainless and heat-resisting steel plate, sheet and strip. Manufacturer BS/UK grade comparisons are provided for interpreting older material descriptions.
| Material specification | BS 1449-2 |
|---|---|
| Material identification | 904S13 (comparison) / N08904 |
| Product / supply condition | Historical flat-product requirements; check the original contract. |
SS904L Chemical Composition
Manufacturer typical composition, mass %; selected elements only.
| Element / description | Mass % / reference value |
|---|---|
| C | 0.01 |
| Cr | 20 |
| Ni | 25 |
| Mo | 4.3 |
| Other | Cu 1.5 |
SS904L Mechanical Properties
Published reference values for the stated form and condition. Typical values are not specification acceptance limits.
| Product form / condition | Tensile (MPa) | 0.2% proof / yield (MPa) | Elongation (%) | Data basis |
|---|---|---|---|---|
| Hot-rolled plate, usually 10–20 mm, transverse; room temperature | 600 | 260 | 50 | Manufacturer typical values; elongation A5. |
Manufacturer reference data is shown for comparison. Use the selected BS 1449-2 edition and certified material test results for acceptance. Confirm specimen direction, gauge length, thickness and heat treatment.
BS 1449-2 Grade Reference
904S13 (comparison) / N08904
| Material specification | BS 1449-2 |
|---|---|
| Source edition | BS 1449-2:1983 |
| Publication status | Withdrawn — 15 July 1999 |
| Product / supply condition | Historical flat-product requirements; check the original contract. |
| Specification information | The BS/UK designations are manufacturer cross-references, not a declaration that the corresponding UNS grade satisfies every clause of BS 1449-2. For new stainless flat-product enquiries review the BS EN 10088-2 route. |
| Comparison tables | View the BS 1449-2 comparison tables |
| Material overview | View SS904L in Materials |
| Source reference | BSI — BS 1449-2:1983 publisher record and withdrawal status |
| Source reference | Outokumpu — Steel Grades, Properties and Global Standards, Tables 4, 5 and 7 |
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