SS304L Stainless Steel
SS304L is the low-carbon version of SS304, combining general corrosion resistance, formability and weldability with reduced susceptibility to chromium carbide precipitation during welding.
SS304L Grade Information
SS304L, commonly designated AISI 304L, is a low-carbon austenitic chromium-nickel stainless steel. Its chemistry is closely related to SS304, but the lower carbon limit reduces the tendency for chromium carbide precipitation during welding.
For Spiral Wound Gaskets, SS304L may be selected as metallic winding material and for compatible ring components where its corrosion resistance, temperature capability and process compatibility meet the required service conditions.
| Common Designation | SS304L / AISI 304L |
|---|---|
| UNS Number | S30403 |
| EN / Werkstoff | 1.4307 / X2CrNi18-9 |
| Material Family | Low-carbon austenitic chromium-nickel stainless steel |
| Common Specification | ASTM A240 / A240M |
| Typical Gasket Use | Metallic winding and compatible ring components |
SS304L Chemical Composition
Typical composition limits for SS304L under ASTM A240 / A240M. Exact chemistry should be confirmed from the applicable specification and certified material documentation.
| Element | Symbol | Composition, % |
|---|---|---|
| Carbon | C | 0.030 max. |
| Manganese | Mn | 2.00 max. |
| Silicon | Si | 0.75 max. |
| Phosphorus | P | 0.045 max. |
| Sulfur | S | 0.030 max. |
| Chromium | Cr | 18.00 – 20.00 |
| Nickel | Ni | 8.00 – 12.00 |
| Nitrogen | N | 0.10 max. |
| Iron | Fe | Balance |
SS304L Mechanical Properties
Representative mechanical requirements for annealed SS304L sheet and strip. Requirements vary with product form, thickness, condition and governing material specification.
| Property | Requirement | Unit |
|---|---|---|
| Tensile Strength | 485 min. | MPa |
| 0.2% Offset Yield Strength | 170 min. | MPa |
| Elongation | 40 min. | % |
| Brinell Hardness | 201 max. | HBW |
| Rockwell B Hardness | 92 max. | HRB |
Mechanical values shown are reference requirements, not design allowables. Use the governing material standard and certified material test report for final engineering and procurement.
SS304L Physical & Service Information
Reference physical properties and service considerations relevant to SS304L material selection.
| Density | Approximately 8.0 g/cm³ |
|---|---|
| Elastic Modulus | Approximately 193 GPa |
| Thermal Conductivity | Approximately 16 W/m·K near 100°C |
| Mean Thermal Expansion | Approximately 17.2 µm/m·K from 20–100°C |
| Melting Range | Approximately 1400–1450°C |
| Structure | Austenitic |
| Carbon Level | Maximum 0.030%, lower than standard SS304 |
| Weldability | Good weldability; the low carbon content reduces susceptibility to chromium carbide precipitation in the heat-affected zone |
| Magnetic Behaviour | Generally non-magnetic in the annealed condition; cold working may introduce some magnetic response |
| Corrosion Behaviour | Good general corrosion resistance. Chloride-rich environments may cause pitting or crevice corrosion and can require a more resistant alloy |
| Heat Treatment | Normally supplied solution annealed. Treatment requirements depend on product form and governing specification |
| Spiral Wound Gasket Selection | Use where SS304L is compatible with the process medium, operating temperature, pressure and selected filler material |
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