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Published: November 7, 2025 | Updated: November 7, 2025By Gangsteel Engineering Team – 25+ Years in Stainless Steel Export Excellence
Navigating the world of stainless steel sheets for high-stakes industrial applications can feel overwhelming, but ASTM A240 UNS S41500 stands out as a reliable, cost-effective choice for engineers and fabricators alike.
As a leading Chinese producer and exporter of premium stainless alloys, Gangsteel has been at the forefront of supplying UNS S41500 sheets under the ASTM A240 specification for over two decades. From the bustling refineries of the Middle East to the precision demands of European power plants, we've delivered this martensitic grade to keep projects on track and budgets intact.
In this in-depth guide, we'll unpack the ASTM A240 UNS S41500 sheet specifications—from chemical makeup to mechanical performance—while addressing the burning question: what's the current price? Drawing on our hands-on expertise in melting, rolling, and testing thousands of tons annually, we'll share practical insights, real project stories, and tips to secure the best deal. If you're spec'ing out corrosion-resistant sheets for valves, heat exchangers, or structural components, this is your roadmap to smarter sourcing. Let's roll up our sleeves and get into the details.
ASTM A240 UNS S41500 sheets are the go-to for applications blending moderate corrosion resistance with robust strength, especially in sour service environments. This standard covers chromium and chromium-nickel stainless steel plates, sheets, and strips for pressure vessels and general use—think seamless integration into ASME Section VIII designs. UNS S41500, a low-carbon martensitic alloy (often called F6NM in forging contexts), delivers a PREN (Pitting Resistance Equivalent Number) around 18, making it tougher than basic 410 SS but more machinable than duplex grades.
At Gangsteel, we've rolled S41500 sheets in thicknesses from 1mm to 200mm, witnessing firsthand how its normalized-and-tempered condition yields consistent flatness and edge quality. Unlike austenitic sheets that might warp under heat, S41500 holds tolerances down to ±0.1mm, crucial for gasket seating in flanges. And with global energy transitions pushing for lighter, longer-lasting materials, these sheets are seeing a surge—our 2025 exports are up 25% year-over-year for oil & gas alone.
For broader options in UNS stainless steel plates, ASTM A240 UNS S41500 fits perfectly as a mid-range performer: weldable, heat-treatable, and compliant with NACE MR0175 for H2S exposure. But specs are just the start—let's drill down.
ASTM A240 mandates rigorous testing for UNS S41500 sheets, ensuring they meet the alloy's dual role in pressure containment and corrosion mitigation. Gangsteel mills produce to these specs using vacuum induction melting (VIM) for ultra-low inclusions, followed by hot-rolling and pickling for pristine surfaces (No. 1 or 2B finish standard).
The chemistry is engineered for balance: enough Cr for passivation, Ni for austenite control during tempering, and Mo to fend off pitting in brackish waters. All values are heat analysis maxima unless noted.
|
Element |
% Range (ASTM A240) |
Gangsteel Typical Melt |
Why It Matters for Sheets |
|---|---|---|---|
|
Carbon (C) |
0.05 max |
0.05 |
Keeps sheets ductile post-weld; low C avoids sensitization. |
|
Manganese (Mn) |
0.5-1.00 |
0.50-1.0 |
Improves hot workability during rolling—reduces edge cracks. |
|
Silicon (Si) |
0.6 max |
0.40-0.60 |
Deoxidizes melt; ensures uniform sheet thickness. |
|
Phosphorus (P) |
0.030 max |
<0.020 |
Minimizes brittleness; vital for thin-gauge bends. |
|
Sulfur (S) |
0.030 max |
<0.010 |
Enhances machinability without pitting risks. |
|
Chromium (Cr) |
11.50-14.0 |
12.20-12.80 |
Forms protective oxide layer; core for 316-equivalent corrosion in mild acids. |
|
Molybdenum (Mo) |
0.50-1.00 |
0.50-0.70 |
Boosts chloride resistance—key for offshore sheet cladding. |
|
Nickel (Ni) |
3.50-5.50 |
4.00-4.80 |
Stabilizes martensite; prevents sigma phase in heat-affected zones. |
|
Nitrogen (N) |
0.10 max |
<0.05 |
Strength booster; controlled to avoid porosity in sheets. |
|
Iron (Fe) |
Balance |
>82.00 |
The matrix—our ESR (Electroslag Remelting) process hits 99.9% purity. |
These compositions ensure ASTM A240 compliance, with Gangsteel adding value through optional low-P/S variants for ultra-critical apps. Every coil comes with a chemistry cert, traceable to the heat number— we've never had a rejection in 15 years of A240 exports.
Tested per ASTM A240 Annex A3 (transverse direction), UNS S41500 sheets post-anneal (1010-1120°C) and temper (565-760°C) deliver:
|
Property |
Min Value (Annealed) |
Typical Gangsteel Sheet |
Test Notes & Sheet Implications |
|---|---|---|---|
|
Tensile Strength (MPa) |
795 |
760-820 |
Exceeds for thin sheets (<6mm); supports high-pressure forming. |
|
Yield Strength (MPa, 0.2%) |
620 |
450-550 |
Critical for sheet buckling resistance in vessels. |
|
Elongation (%) |
15 (in 50mm) |
25-30 |
High ductility for deep drawing; we've formed 1.5mm sheets into complex ducts. |
|
Hardness (HRB) |
32 max |
32 max |
Soft enough for shearing; hardens to HRC 25 post-temper for wear. |
|
Impact Toughness (CVN, J) |
27 @ 0°C |
40-50 @ -46°C |
Ensures sheet integrity in cold bends; NACE-tested for sour gas. |
At elevated temps (up to 425°C), tensile drops <15%; cryogenic down to -196°C, it retains 90% yield. Gangsteel's sheets undergo 100% ultrasonic testing (ASTM A435) to catch laminations early—zero defects in our last 100 coils.
These specs make ASTM A240 UNS S41500 sheets ideal for ASTM A240 /A240M compliance in global projects.
UNS S41500 sheets under A240 align with international calls, simplifying cross-border sourcing. Gangsteel dual-certs to cut red tape.
Compared to 316L sheets (austenitic), S41500 offers 20% higher hardness at half the price, but trades some pitting resistance (PREN 18 vs. 24). Vs. 410 sheets, it's 2x tougher in impacts. In a 2024 UAE desalination swap, clients ditched 316 for S41500 sheets, slashing costs 35% while maintaining 5-year warranties. For ASME variants, check our ASME SA240/SA240M lineup.
These sheets are battle-tested in corrosive, high-load zones. In oil & gas, they clad API 650 tanks against H2S. Chemical processing? Lining reactors for acetic acid. Power? Cladding superheaters per ASME Section I.
Gangsteel story: In 2023, a Scottish wind farm used 12 tons of 6mm S41500 sheets for nacelle housings—resisted North Sea salt for 18 months without pitting, per client UT reports. Another: Indonesian palm oil mill's heat exchanger sheets (20mm thick) handled 150°C vapors, extending MTBF by 40%.
Pricing for ASTM A240 UNS S41500 sheets fluctuates with nickel/chromium indices and demand—up 8% in Q3 2025 on energy sector booms. From Gangsteel's China mills, expect $2,600-2,800 USD per ton FOB Tianjin for standard 2B finish, 6-12mm thick. Breakdown:
Lead times: 7-14 days stock, 21-28 custom. Get a quote; we've locked rates for Q4 2025 amid volatility.
Gangsteel: Mill-direct savings, 99% on-time.
Q: What are the key ASTM A240 specs for UNS S41500 sheets?
A: Covers Cr-Ni sheets for pressure vessels; UNS S41500 requires 11.5-13.5% Cr, tensile ≥795 MPa, elongation 20%. Thickness 0.5-50mm, tested per A240 Annex A. Gangsteel exceeds with 760 MPa typical tensile, ideal for UNS S41500 stainless steel plate forming.
Q: How does UNS S41500 sheet pricing compare to 316L?
A: $2,600-2,800/ton vs. 316L's $3,800-4,200—30% savings for similar corrosion in non-extreme apps. Price holds steady Q4 2025; bulk buys dip to $2,500. Our exports beat premiums by leveraging China efficiency.
Q: Is ASTM A240 UNS S41500 suitable for welding sheets?
A: Yes—low C (0.15 max) and CE <0.40 enable GTAW/SMAW with E410 filler, 150°C preheat. PWHT at 620°C/2hrs restores ductility. We've welded 10mm sheets into exchangers without cracks; full WPS available.
Q: What equivalents exist for ASTM A240 UNS S41500 sheets?
A: ASME SA240 (pressure qual), EN 1.4313 (EU sheets). Use SA240 for boilers; 1.4313 for CE-marked vessels. Gangsteel dual-certs; swapped for a German client, saving 20% on cert fees.
Q: Can UNS S41500 sheets handle sour service per NACE?
A: Absolutely—MR0175 compliant <22 HRC, HIC-resistant. Yield 550 MPa suits H2S up to 10% at 150°C. Supplied 20 tons to QatarGas; passed 30-day immersion tests.
Q: What's the lead time and MOQ for ASTM A240 UNS S41500 sheets?
A: MOQ 1 ton (samples 10kg); stock 7 days, custom 21 days. Pricing $2,600-2,800/ton FOB; air freight adds $0.50/kg. We've rushed 5 tons to Houston in 5 days.
Q: How do you ensure sheet quality at Gangsteel?
A: VIM+ESR melting, 100% UT (A435), PMI, and mill certs. ISO 9001/14001 certified; zero claims in 2024. For standards, see ASTM A240 /A240M or ASME SA240/SA240M.
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