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Unlock superior high-temperature performance with ASME SA240 ASTM A240 UNS S33400 stainless steel sheet, a titanium- and aluminum-stabilized austenitic alloy tailored for enhanced scaling resistance. As Gangsteel, your reliable manufacturer and exporter, we produce this specialized grade in state-of-the-art Chinese mills, fully compliant with ASME and ASTM specifications for international projects. Also known as AISI 334 or Incoloy 840, UNS S33400 excels in oxidizing and carburizing atmospheres, making it indispensable for furnace components, heat exchangers, and pressure vessels in petrochemical and aerospace sectors. Our ASME SA240 ASTM A240 UNS S33400 stainless steel sheets provide the edge in durability under thermal stress.
With Gangsteel's ISO 9001 and PED certifications, we ensure seamless worldwide supply chains. Integrate our sa240/a240 uns s33400 into your designs—contact for customized pricing and expedited delivery. Discover parallels in sa240/a240 uns s33228, sa240/a240 uns s34565, or sa240/a240 uns s34800.
Gangsteel Comprehensive Guide to ASME SA240 ASTM A240 UNS S33400 stainless steel sheets, a Ti/Al-stabilized austenitic grade offering improved high-temperature scaling resistance. Covering chemical composition, mechanical properties, international equivalents, specifications, applications, advantages, and pricing from Gangsteel, it highlights why this material is ideal for furnace parts, heat exchangers, and oxidizing environments. With detailed tables and FAQs, discover how Gangsteel's expertise ensures quality and global delivery.
ASME SA240 ASTM A240 UNS S33400 stainless steel sheetis a hot-rolled or cold-rolled plate from the austenitic stainless steel family, stabilized with titanium and aluminum for superior resistance to scaling and sensitization. Designated as UNS S33400 under ASME SA240 for pressure vessels and ASTM A240 for general applications, it's optimized for wrought products in annealed condition. The Ti and Al additions enhance high-temperature stability, preventing carbide precipitation and promoting a protective oxide layer.
Compared to standard 304 or 316, UNS S33400 stainless steel sheets deliver better performance in continuous service up to 900°C, with improved creep resistance and weldability. Density: 8.0 g/cm³ for balanced weight and strength. Versatile for fabricating furnace rolls, expansion joints, and thermal shields. Gangsteel has delivered thousands of tons globally, with full ISO 9001/PED traceability. Related grades: sa240/a240 uns s34809 or sa240/a240 uns s35045.
ASME SA240 ASTM A240 UNS S33400 stainless steel sheet's formulation ensures thermal endurance. Per ASTM A240/SA240:
|
Element |
Composition Range (%) |
Role in Alloy |
|---|---|---|
|
Carbon (C) |
≤0.080 |
Limits carbide formation for weldability |
|
Silicon (Si) |
≤1.000 |
Enhances scaling resistance |
|
Manganese (Mn) |
≤1.000 |
Improves hot ductility |
|
Phosphorus (P) |
≤0.030 |
Reduces brittleness |
|
Sulfur (S) |
≤0.015 |
Minimizes hot cracking |
|
Chromium (Cr) |
18.00-22.00 |
Forms protective oxide for oxidation resistance |
|
Nickel (Ni) |
18.00-22.00 |
Stabilizes austenite, boosts high-temp strength |
|
Titanium (Ti) |
0.20-0.40 |
Stabilizes against sensitization |
|
Aluminum (Al) |
≤0.20 |
Aids in oxide layer formation |
|
Iron (Fe) |
Balance |
Base structure |
This equips UNS S33400 stainless steel sheets for scaling-prone heat. Gangsteel's PMI confirms compliance. Comparable: sa240/a240 uns s35135 or sa240/a240 uns s35315.
ASME SA240 ASTM A240 UNS S33400 stainless steel sheetsprovide reliable high-temp mechanics:
|
Property |
Value (Minimum) |
Test Condition |
|---|---|---|
|
Tensile Strength |
515 MPa (75 ksi) |
Annealed |
|
Yield Strength |
205 MPa (30 ksi) |
0.2% Offset |
|
Elongation |
40% in 50mm |
Transverse |
|
Hardness |
≤217 HB (Brinell) |
As-rolled |
Annealed/pickled delivery; custom tempering. ASME SA240 for vessels; ASTM A240 for fittings. Gangsteel's cut-to-size streamlines. Related: sa240/a240 uns s38100 or sa240/a240 uns s38815.
Gangsteel supplies international equivalents:
|
Country/Region |
Designation |
Standards |
Key Notes |
|---|---|---|---|
|
USA |
UNS S33400 / AISI 334 |
ASTM A240, ASME SA240 |
Ti/Al stabilized austenitic |
|
Europe |
1.4878 |
EN 10088 |
High-temp scaling resistant |
|
Germany |
X6CrNiTi1810 |
DIN 17460 |
Stabilized for heat service |
|
Japan |
SUS 334 (equiv.) |
JIS G 4303 |
Wrought heat-resistant |
|
China |
0Cr18Ni11TiAl (equiv.) |
GB/T 1220 |
Domestic stabilized analog |
Match on thermal properties. Details: sa240/a240 uns s31200 or sa240/a240 uns s31260.
Gangsteel's ASME SA240 ASTM A240 UNS S33400 stainless steel sheets:
|
Specification |
Range/Details |
|---|---|
|
Thickness |
0.5 mm to 200 mm |
|
Width |
Up to 3000 mm |
|
Length |
Up to 12000 mm |
|
Surface Finish |
Hot-rolled (No.1), Cold-rolled (2B, BA), Annealed & Pickled |
|
Forms |
Sheets, Plates, Coils, Cut-to-Size |
|
Cutting Options |
Plasma, Laser, Waterjet |
Density: 8.0 g/cm³. Precision for sa240/a240 uns s32001.
UNS S33400 stainless steel sheetsfor thermal challenges:
Gangsteel's sheets extend life 25%. Pair: sa240/a240 uns s32003.
Gangsteel's ASME SA240 ASTM A240 UNS S33400 stainless steel sheets:
Elite support. More: sa240/a240 uns s32101.
ASME SA240 ASTM A240 UNS S33400 stainless steel sheetsresist scaling to 900°C via Ti/Al stabilization, forming durable oxides. Outperforms 321 in sensitization. NACE validates welds.
Gangsteel's prep ensures readiness. Compare sa240/a240 uns s32900.
Gangsteel's UNS S33400 pricing:
Min 1 ton; 15% bulk. Quote: admin@gangsteel.com. https://gangsteel.net. See sa240/a240 uns s32906.
UNS S33400(AISI 334/Incoloy 840) is a Ti/Al-stabilized austenitic stainless steel for high-temperature applications like furnace expansion joints, heat exchanger tubes, and pressure vessel components in petrochemical and aerospace. Its stabilization prevents sensitization during welding/heat exposure, offering scaling resistance up to 900°C in oxidizing/carburizing atmospheres, superior to 321 SS in continuous service. Gangsteel provides ASME/ASTM sheets for vessels/fittings, with real-world use in reformer tubes reducing downtime 20%. Alternatives: sa240/a240 uns s32950.
UNS S33400improves on 321 (S32100) with dual Ti/Al stabilization for better high-temp scaling (up to 900°C vs. 870°C) and reduced carbide precipitation, plus higher Si (≤1% vs. 0.8%) for oxide adherence. S33400 UTS 515 MPa matches 321, but excels in creep at 800°C+; 321 suits intermittent heat, S33400 continuous. Cost: S33400 15% higher but extends life 25%. Gangsteel recommends for furnace upgrades. Equiv: sa240/a240 uns s32803.
Yes, UNS S33400 welds readily with GTAW/SMAW using ER321 or E347 fillers; Ti/Al minimize sensitization, no post-weld anneal needed for most, but optional 1050°C for optimization. Preheat 100°C, interpass <150°C to avoid cracking. Tests show no intergranular corrosion post-thermal cycle. Gangsteel supplies weld certs, supporting thick-plate fabrication with low distortion. Guides: sa240/a240 uns s31200.
ASME SA240 ASTM A240 UNS S33400 stainless steel sheetdensity is 8.0 g/cm³ (0.289 lb/in³), akin to austenitics, facilitating 10-15% lighter designs vs. ferritics in heat apps without strength trade-off. This optimizes furnace efficiency. Gangsteel integrates in logistics for cost savings.
Gangsteel: ~$2.40-$3.25/kg standard sheets (FOB), driven by Ti/Al; custom/thick +15%. 1+ ton: 15% off. Metals volatility applies; latest via admin@gangsteel.com. Vs. 321: 10% premium for stability. Compare sa240/a240 uns s31260.
UNS S33400solution anneals 1050-1120°C (quench) to dissolve carbides, restoring resistance; Ti/Al stabilize, no aging needed, but stress-relieve 650-800°C for formed parts. Avoid 425-900°C prolonged to prevent sigma. Gangsteel treats in-house, verifying via micro for 900°C service. Cycles on sa240/a240 uns s32001.
Gangsteel's UNS S33400 sheets feature EN 10204/3.1 MTCs (chem/mech), PMI/UT, third-party (SGS/BV) for integrity/ASME/ASTM/PED. ISO 9001 full traceability; optional NACE MR0175 for sour. Supports vessel code stamping. More: sa240/a240 uns s32003.
Acquire premium ASME SA240 ASTM A240 UNS S33400 stainless steel sheets through Gangsteel. https://gangsteel.net or admin@gangsteel.com for samples/quotes. Shanghai/Rotterdam for global reach—advance with Gangsteel! View sa240/a240 uns s32101.
Keywords: ASME SA240 UNS S33400, Incoloy 840 stainless steel sheet, Gangsteel exporter
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