AISI 304LN Stainless Steel Plate | 304LN China steel mill-Direct Supply
What is AISI 304LN Stainless Steel Plate?
As a professional China steel mill-Direct Supply and stainless steel plate supplier, SHH STEEL is pleased to present AISI 304LN Stainless Steel Plate.
AISI 304LN (UNS S30453) is an optimized variant of the classic 304 family that combines two important improvements: extra-low carbon content (maximum 0.03%) and intentional nitrogen addition. The low carbon provides excellent resistance to intergranular corrosion after welding, while the nitrogen significantly increases yield and tensile strength compared with standard 304L.
This dual enhancement makes AISI 304LN particularly suitable for welded constructions that also require higher mechanical strength. The grade remains fully austenitic, non-magnetic in the annealed condition, and offers good formability and toughness.
SHH STEEL supplies AISI 304LN as true China steel mill-Direct Supply, sourcing directly from major Chinese stainless steel mills. This model delivers competitive mill pricing, consistent quality, complete heat traceability and reliable delivery. SHH STEEL offers AISI 304LN in plate and sheet form across a practical range of thicknesses and surface finishes.
AISI 304LN is frequently compared with a240 304, a240 304l, a240 304n, a240 316l and a240 321 when projects require both higher strength and excellent as-welded performance. SHH STEEL provides technical support to help customers select the most suitable grade.
Material Specification
| Specification Element | Requirement | SHH STEEL Compliance |
|---|---|---|
| Grade | AISI 304LN / UNS S30453 | Confirmed |
| Related Standards | ASTM A240, ASME SA240, EN, JIS related | Available |
| Product Form | Plate, Sheet | Available |
| Delivery Condition | Solution Annealed | Standard |
| Thickness Range | 0.5 mm – 80 mm (thicker available on request) | Custom sizes supported |
| Width | Up to 2000–3000 mm | Available |
| Length | Up to 12000 mm or cut-to-length | Available |
| Surface Finish | 2B, No.1, BA, No.4 | Available |
| Certification | EN 10204 3.1 / Mill Test Certificate | Available |
SHH STEEL can supply AISI 304LN dual-certified to ASTM A240 / ASME SA240 when required by the project.
Chemical Composition
Typical Chemical Composition of AISI 304LN (UNS S30453):
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.030 |
| Silicon (Si) | ≤ 1.00 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.00 – 20.00 |
| Nickel (Ni) | 8.00 – 12.00 |
| Nitrogen (N) | 0.10 – 0.16 |
| Iron (Fe) | Balance |
The combination of extra-low carbon (≤ 0.03%) and elevated nitrogen (0.10–0.16%) is the defining feature of AISI 304LN. Low carbon ensures excellent resistance to intergranular corrosion after welding, while nitrogen provides solid-solution strengthening that raises both yield and tensile strength. SHH STEEL carefully controls both elements to deliver consistent performance.
Mechanical Properties
Annealed Condition (typical values)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 550 MPa |
| Yield Strength (0.2%) | ≥ 240 MPa |
| Elongation (in 50 mm) | ≥ 35–40% |
| Hardness | ≤ 217 HB |
AISI 304LN offers higher strength than standard a240 304l while retaining the excellent ductility and toughness expected from the 304 family. The higher strength can allow thickness reduction in many designs. SHH STEEL supplies material with consistent nitrogen-enhanced mechanical properties.
Physical Properties
- Density: approximately 7.93 g/cm³
- Magnetic Response: Non-magnetic in the annealed condition
- Melting Range: approximately 1400–1450°C
Material Comparison
| Grade | Carbon | Nitrogen | Strength Level | Weldability & IGC Resistance | Key Advantage | Typical Preference |
|---|---|---|---|---|---|---|
| AISI 304 | ≤ 0.08 | Low | Standard | Good | Best overall balance | General purpose |
| AISI 304L | ≤ 0.03 | Low | Lower | Excellent | Superior weldability | Heavy welded constructions |
| AISI 304N | ≤ 0.08 | Elevated | Higher | Good | Higher strength | Strength-critical applications |
| AISI 304LN | ≤ 0.03 | Elevated | Higher | Excellent | Higher strength + excellent weldability | Welded high-strength service |
| AISI 316L | ≤ 0.03 | Low | Standard | Excellent | Better pitting resistance | Chloride environments |
| AISI 321 | ≤ 0.08 | Low | Standard | Good (stabilized) | High-temperature welded service | Elevated-temperature welding |
AISI 304LN is the preferred choice when both higher strength and excellent as-welded resistance to intergranular corrosion are required. When only higher strength is needed without extensive welding, a240 304n may be sufficient. For improved pitting resistance, SHH STEEL recommends a240 316l.
Corrosion Resistance
AISI 304LN offers corrosion resistance essentially equivalent to standard AISI 304 and 304L in most environments. It performs well in atmospheric conditions, fresh water, food products and many mild to moderate chemical media.
The low carbon content provides excellent resistance to intergranular corrosion after welding. The nitrogen addition has a neutral to slightly beneficial effect on pitting resistance. In chloride-containing service, however, AISI 304LN remains susceptible to pitting and stress corrosion cracking. For such conditions, SHH STEEL recommends upgrading to a240 316l or a240 2205.
Weldability
AISI 304LN has excellent weldability. The extra-low carbon content minimizes the risk of intergranular corrosion in the as-welded condition, while the nitrogen contributes to higher strength in both the base metal and the weld zone when proper filler metals are used.
Matching or 308L-type filler metals are commonly employed. Post-weld annealing is generally not required. This combination of higher strength and outstanding as-welded performance is the main reason SHH STEEL recommends AISI 304LN for demanding welded constructions.
Heat Treatment
AISI 304LN is normally supplied in the solution-annealed condition by SHH STEEL.
Recommended Solution Annealing Parameters
- Temperature range: 1010 – 1120°C
- Cooling: Rapid cooling (water quench preferred)
Proper solution annealing is important to retain nitrogen in solid solution and to optimize both strength and corrosion resistance. SHH STEEL controls heat treatment to ensure consistent performance.
Surface Finishes
| Finish | Description | Typical Use / Keywords |
|---|---|---|
| 2B | Cold-rolled, annealed, pickled, skin-passed | AISI 304LN 2B – most common for general fabrication |
| No.1 | Hot-rolled, annealed and pickled | AISI 304LN No.1 – industrial plate |
| BA | Bright Annealed | AISI 304LN BA – cleaner surface applications |
| No.4 | Brushed finish | AISI 304LN No.4 – architectural surfaces |
SHH STEEL regularly supplies AISI 304LN in 2B and No.1 finishes, and can provide other finishes according to project requirements.
Tolerances
Dimensional tolerances for AISI 304LN Stainless Steel Plate supplied by SHH STEEL generally conform to ASTM A480 practices.
Typical available size range:
- Thickness: 0.5 mm – 80 mm
- Width: up to 2000–3000 mm
- Length: up to 12000 mm or cut-to-length
SHH STEEL provides precise dimensional control and can support tighter tolerances when required.
Equivalent Material Grades
| Grade / Designation | Standard / UNS | Notes |
|---|---|---|
| AISI 304LN | — | — |
| UNS S30453 | — | Unified Numbering System |
| ASTM A240 Type 304LN | ASTM A240 | When dual certified |
| Related low-carbon N-strengthened 304 | EN / JIS / GB | Approximate national equivalents |
Related grades for comparison include a240 304, a240 304l, a240 304n, a240 316l and a240 321.
Applications
AISI 304LN is selected for welded constructions that also require higher strength than standard 304L. Typical applications of AISI 304LN include:
| Industry / Sector | Typical Components / Equipment (with keywords) |
|---|---|
| Pressure Vessels & Tanks | AISI 304LN storage tanks, pressure vessels, process containers |
| Chemical & Process Industry | AISI 304LN welded reactors, piping and process equipment |
| Structural Fabrication | AISI 304LN high-strength welded frames and structural parts |
| Food & Beverage | AISI 304LN processing equipment and storage tanks |
| Architecture & Construction | AISI 304LN load-bearing and decorative welded components |
| General Engineering | AISI 304LN high-strength welded fabrications |
SHH STEEL supplies AISI 304LN for these demanding applications with consistent quality. For related industry solutions, see our petrochemical industry, construction industry and equipment manufacturing pages. Supporting services include steel cutting services and steel welding services.
Why Choose SHH STEEL
SHH STEEL is a China steel mill-Direct Supply specializing in stainless steel plate and sheet. By working directly with major Chinese stainless steel mills, SHH STEEL supplies AISI 304LN with the following advantages:
- Genuine China steel mill-Direct Supply pricing
- Consistent quality and complete heat traceability
- Full Mill Test Certificates (EN 10204 3.1)
- Material combining higher strength with excellent weldability
- Flexible dimensions and surface finishes (including AISI 304LN 2B and AISI 304LN No.1)
- Technical support for selection among 304, 304L, 304N and 304LN grades
- Value-added services including steel cutting services, steel welding services and worldwide shipping service
For more information about our company and full product range, please visit China steel Mill Agent-SHH STEEL.
FAQ
- What is the main advantage of AISI 304LN over AISI 304L?The intentional nitrogen addition significantly increases yield and tensile strength while retaining the excellent weldability and intergranular corrosion resistance of 304L. SHH STEEL recommends 304LN when higher strength is required in welded constructions.
- How does AISI 304LN compare with AISI 304N?AISI 304LN has extra-low carbon in addition to elevated nitrogen, giving it better resistance to intergranular corrosion after welding. SHH STEEL recommends 304LN when extensive welding is involved.
- Is AISI 304LN magnetic?Non-magnetic in the annealed condition. SHH STEEL supplies fully annealed material as standard
- What is the density of AISI 304LN?Approximately 7.93 g/cm³. SHH STEEL provides material certificates confirming physical and mechanical properties.
- Does SHH STEEL supply dual-certified ASTM A240 / AISI 304LN material?Yes, SHH STEEL commonly supplies dual-certified material upon request.
Conclusion
AISI 304LN Stainless Steel Plate is a low-carbon, nitrogen-strengthened austenitic grade that successfully combines higher strength with excellent weldability and superior resistance to intergranular corrosion. It is an outstanding choice for pressure vessels, process equipment, structural fabrications and other welded applications where elevated mechanical properties are required.
As a professional China steel mill-Direct Supply, SHH STEEL provides high-quality AISI 304LN Stainless Steel Plate with competitive pricing, full certification and complete technical support.
Contact SHH STEEL today for stock availability, surface finish options (including AISI 304LN 2B and AISI 304LN No.1), or a competitive quotation.
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