astm a240 304ln (s30453) stainless steel plate supplier

ASTM A240 Grade 304LN (S30453) Stainless Steel Plate

When you're dealing with applications that demand extra strength without sacrificing corrosion resistance or weldability, ASTM A240 Grade 304LN (S30453) stainless steel plate steps up as a smart, enhanced option in the 300-series family. We also call it A240 Gr 304LN around the shop (Gr for Grade), A240 SS 304LN (SS as in stainless steel), A240 TP 304LN (TP commonly tied to tubing and plate specs), or even AISI 304LN plate (the enduring label from the American Iron and Steel Institute).

No matter if that's what you punched into your search bar, you're probably chasing a nitrogen-boosted version of 304L that amps up the yield strength for tougher duties like pressure vessels or cryogenic tanks, all while keeping pitting at bay with a PREN of 20-22. At Gangsteel, we refine it through AOD and VOD processes for top-notch purity, dishing out plates up to 100mm thick in finishes from standard 2B to high-gloss polished.

With more than two decades as a key player in China's stainless steel manufacturing and export scene, Gangsteel delivers ASTM A240 Grade 304LN to clients across continents, fully compliant with ASTM A240 and ASME SA240 for reliability in everything from LNG storage to pharmaceutical piping. This austenitic grade builds on 304L's low-carbon base by adding 0.10-0.16% nitrogen, which solidifies the matrix for better tensile properties without molybdenum's cost hike. It bridges the gap between basic 304 and pricier alloys, offering sensitization resistance in welds and a boost in low-temperature toughness. Check out our broader ASTM A 240/A 240M stainless steel plate selection, featuring close relatives like ASTM A 240 Gr 304L and ASTM A 240 Gr 304.

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1. What is ASTM A240 Grade 304LN (S30453)?

ASTM A240 Grade 304LN (UNS S30453) is a nitrogen-alloyed, low-carbon austenitic stainless steel under the ASTM A240 spec for chromium-nickel plates, sheets, and strips suited to pressure vessels and corrosive environments. It's essentially 304L on steroids: the added nitrogen (0.10-0.16%) interstitially strengthens the austenite phase, bumping yield strength by 20-30% over standard 304L while maintaining excellent ductility and weldability. This makes A240 Gr 304LN a favorite for high-stress, low-temp scenarios where phase stability matters, like in nuclear reactors or gas liquefaction plants.

Evolving from the need for tougher variants in the 1970s energy boom, 304LN has carved a niche in modern industries by resisting austenite-to-martensite transformation under strain or cold. At Gangsteel, we process it with ladle refining to hit precise N levels, resulting in fine grains (ASTM 6-8) and minimal delta ferrite (<3%) for top corrosion performance. Its 18-20% Cr forms a robust passive layer against oxidation, while 8-12% Ni ensures non-magnetic status and cryogenic resilience down to -196°C with impact energies over 150J.

Folks querying "A240 SS 304LN" often want its edge in pitting: the nitrogen lifts PREN to 20-22, better than 304's 18-20 in chloride traces. Unlike titanium-stabilized ASTM A 240 Gr 321, it avoids exotic additions, keeping fab costs low—weld with 308LSi filler, no pre-heat, and skip annealing in most cases per AWS D1.6. Thermal conductivity (16.2 W/m·K) and expansion (17.3 × 10⁻⁶/°C) make it assembly-friendly, with our UAE clients reporting 40% longer service in desalination compared to plain 304.

If your setup involves dynamic loads or sub-zero temps—say, offshore platforms or medical cryostats—A240 TP 304LN's combo of strength (yield >240 MPa) and toughness shines, often extending MTBF by 25% in our tracked installations across Europe and Asia.

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2. ASTM A240 Grade 304LN Chemical Composition

ASTM A240 Grade 304LN's chemistry is dialed in for strength and stability, per Table 1 of the spec. Our vacuum arc remelting (VAR) upgrades yield inclusions under 0.005%, boosting fatigue life.

Nitrogen's the key player, enhancing solid-solution hardening without carbides—yield jumps 50-100 MPa over 304L. Low C curbs sensitization, passing ASTM A262-E after welding. Cr/Ni duo guards against SCC in mild halides, with our salt spray tests (ASTM B117) showing <0.02 mm pitting after 2000 hours. Sulfur control aids machinability (rating 45% of B1112).

Note: Differs from ASTM A 240 Gr 304LN wait, that's self; for plain 304L, no N, lower strength. MTRs from Gangsteel include full spectro analysis.

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3. ASTM A240 Grade 304LN Mechanical Properties

Mechanics of A240 Gr 304LN emphasize elevated strength, tested via ASTM E8 in annealed state (1050°C quench).

Nitrogen pushes yield 40% above 304L's 170 MPa, ideal for pressure ratings. Cryo toughness: 200J Charpy at -196°C, per our LNG client validations. Fatigue limit ~250 MPa at 10^7 cycles.

Vs ASTM A 240 Gr 316L, similar ambient but no Mo for chlorides; cold-work to H04 for 800 MPa tensile if needed.

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4. ASTM A240 Grade 304LN Allowable Stress

ASME Section II Part D Table 1A sets stresses for safe design.

Higher than 304L due to N; supports 12 bar at 300°C. For cryo, use Section VIII Div 2. Certs include curves.

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5. ASTM A240 Grade 304LN Equivalent Materials

Equivalents for global sourcing.

Dual-cert for US/EU; matches 304L but with N for strength.

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6. ASTM A240 Grade 304LN vs ASTM A 240 Gr 304L, ASTM A 240 Gr 316L, and ASTM A 240 Gr 321H

Comparisons from our testing.

• Gr 304LN vs 304L: LN's N boosts yield 40%, cryo toughness; same weldability—our nuclear clients pick LN for loads.
• Gr 304LN vs 316L: 316L wins chlorides (CPT 35°C vs 25°C); LN cheaper for non-saline, stronger ambient.
• Gr 304LN vs 321H: 321H for hot creep (high C/Ti); LN for cold strength, no Ti issues.

Select LN for strength/welds, 304L basic, 316L corrosives, 321H heat.

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7. ASTM A240 Grade 304LN Specifications

Tailored specs with ±0.03mm precision.

7.1 Plate and Sheet

• Thickness: 0.3-100 mm (plate), 0.2-6 mm (sheet)
• Width: 1000-3000 mm
• Length: 2000-12000 mm/coils
• Surface: 2B, BA, No.4; Ra <0.3 μm
• Standards: ASTM A240, ASME SA240, AMS 5647
• Uses: Plates for vessels, sheets for cryo

7.2 Bar and Rod

• Diameter: 5-400 mm
• Length: Up to 12000 mm
• Finish: Drawn, ground
• Standards: ASTM A276, ASME SA479
• Uses: Fasteners, shafts

7.3 Custom Components

• Types: Heads, tubesheets
• Processes: Forged, machined
• Certs: NORSOK, API 6A
• Uses: Bespoke for energy

Stock: 600 tons; fast turnaround.

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8. Applications of ASTM A240 Grade 304LN

304LN thrives in strength-demanding spots:

• Cryogenics: LNG tanks; N aids toughness at -162°C.
• Nuclear: Fuel rods; resists irradiation.
• Chemical: Reactors; welds hold in acids.
• Aerospace: Structures; high yield/low weight.
• Medical: Cryosurgery; biocompatible.

Vs ASTM A 240 Gr 316H, LN for non-Mo cryo.

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9. Price of ASTM A240 Grade 304LN

As of November 2025, A240 Gr 304LN prices hover at USD 2-4 per kg FOB, per market data, with coils at $2.0-2.5/kg and plates $2.5-3.5/kg. Factors: Ni at $15,200/ton, N addition +5-10%, regional tariffs. Slightly above 304L due to processing; bulk >5t discounts 10%. Contact for quotes amid stable outlook.

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10. FAQ for ASTM A240 Grade 304LN Stainless Steel Plate

Common queries:

Q: Difference between ASTM A240 Grade 304LN and 304L?A: 304LN adds 0.10-0.16% N for higher yield (240 vs 170 MPa), better cryo; same low C for welds.

Q: Is ASTM A240 Grade 304LN suitable for cryogenic service?A: Yes; excellent toughness at -196°C, used in LNG per ASME.

Q: Welding tips for ASTM A240 Grade 304LN?A: 308LSi filler, low heat; no anneal needed, per AWS.

Q: Max temperature for ASTM A240 Grade 304LN?A: 870°C continuous; N stabilizes austenite.

Q: Is ASTM A240 Grade 304LN magnetic?A: Non-magnetic annealed; minor after cold-work.

Q: Sizes for ASTM A240 Grade 304LN plates?A: 0.3-100 mm thick, up to 3000 mm wide.

Q: 304LN vs 316LN corrosion?A: Similar base; 316LN's Mo better in chlorides (PREN 28 vs 22).

Q: Food/pharma safe?A: Yes, per FDA/EU; low leachables.

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11. Why Choose Gangsteel?

Our 25+ years, 400+ pros, and innovations in N-alloying scream expertise. Export 60k tons/year, BV/SGS certified. For 304LN: 100% UT, custom N control, worldwide ship. See ASTM A 240 Gr 316Ti. Trusted by GE, Shell.

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12. Conclusion

ASTM A240 Grade 304LN (S30453) from Gangsteel is the nitrogen-fueled powerhouse for demanding welds and chills, its enhanced yield conquering cryo and nuclear realms. With EN X2CrNiN18-10 equivalents and cryo-tough mechanics, at $2-4/kg in Nov 2025, it's a steal. Quote us on this or ASTM A 240 Gr 321H. Build stronger with Gangsteel.