ASTM A240 446 Stainless Steel Hot-Rolled Plate
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Why Choose ASTM A240 446 Stainless Steel Plate?
ASTM A240 446 hot-rolled stainless steel plate is a high-chromium ferritic stainless steel engineered for exceptional high-temperature oxidation resistance and thermal stability. With a chromium content of approximately 23%–27%, it exhibits excellent resistance to oxidation and scale spalling at temperatures up to 1,100°C, making it widely used in industrial furnaces, heat treatment equipment, burner components, kiln linings, glass manufacturing, and petrochemical heating systems.
SS 446 Plate Manufacturer, Supplier, and Exporter
Whether for furnace construction, heat exchanger structures, thermal processing equipment, or other high-temperature industrial applications, GNEE supplies ASTM A240 446 stainless steel plates of consistent quality-ideal for scenarios where 304 or 430 stainless steels often fail to meet service life requirements. Grade 446 stainless steel offers superior resistance to corrosion in sulfur-bearing atmospheres, thermal fatigue, and high-temperature corrosion, helping to reduce maintenance frequency and replacement costs in continuous high-temperature operations.
446 Hot Rolled Steel Plate production process
GNEE supplies ASTM A240/ASME SA240 446 hot-rolled plates with thicknesses ranging from 3.0 mm to 100 mm, widths up to 2,500 mm, and lengths up to 12,000 mm. Compared to cold-rolled sheets, these hot-rolled plates offer advantages in heavier gauges, featuring a uniform internal microstructure and stable mechanical properties. They are well-suited for manufacturing medium-to-heavy structural components and high-temperature pressure-bearing parts, maintaining resistance to scale spalling during long-term high-temperature use. The continuous service temperature reaches 1093°C (2000°F), with intermittent service temperatures up to 1100°C (2012°F).
In addition, we offer 446 stainless steel perforated plates, 446 Checkered plates,446 cold-rolled sheets, and 446 SS coils/strips.
Stainless Steel 446 Plate Specification
Plate Standards: ASTM A240 / ASME SA240
Plate Type: ASTM A240 Type 446 Plate
Specification:
Cold rolled: 1219mm * 2438mm (4′ x 8′), 1219mm * 3048mm (4′ x 10′), 1220mm * 2440mm, 1250mm * 2500mm or as your requirement.
Hot rolled: 1500mm * 2000mm, 1000mm * 3000mm, 1500mm * 4000mm, 1500m * 6000mm or as your requiremnt.
Plates Technique: Hot Rolled And Cold Rolled. 446 Stainless Steel plate
Plates Width: 1000-2000mm
Plates Thickness: 0.2-6.0mm for cold rolled,3.0-300mm for hot rolled
Plates Length: 1000-6000mm
SS 446 Plate Size: 6000mm x 2000mm / 4000mm x 2000mm / 4000mm x 1500mm / 3000mm x 1500mm / 2500mm x 1250mm / 2000mm x 1000mm. Please contact us for non-standard sizes and lengths
SS 446 Plate Chemical Composition
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
Fe |
|
SS 446 |
0.2 max |
1.5 max |
0.75 max |
0.04 max |
0.030 max |
23 – 30 |
– |
0.50 max |
0.10 – 0.25 |
Balance |
Stainless Steel 446 Plate Mechanical Properties
|
Density |
Melting Point |
Tensile Strength |
Yield Strength (0.2%Offset) |
Elongation |
|
7.5 g/cm3 |
1510 °C (2750 °F) |
Psi – 75,000 , MPa – 485 |
Psi – 40,000 , MPa – 275 |
20 % |
Equivalent Grades for 446 Stainless Steel Plate
| USA/ Canada ASME-AISI | European | UNS Designation | Japan/JIS |
|
AISI 446 |
DIN 1.4762 |
UNS S44600 |
SUS 446 |
ASTM A240 Stainless Steel 446 Plate Sizes Chart
| Thickness | Thickness | Size Range | Surface Area per Unit weight | Approx Weight per Plate | ||
| inches | mm | lbs/ft² | kg/m² | lbs | kg | |
|---|---|---|---|---|---|---|
| 0.015 | 0.381 | 36 x 96 | 0.630 | 3.07566 | 15.12 | 6.84936 |
| 0.015 | 0.381 | 36 x 120 | 0.630 | 3.07566 | 18.90 | 8.5617 |
| 0.0178 | 0.45212 | 36 x 96 | 0.756 | 3.690792 | 18.15 | 8.22195 |
| 0.0178 | 0.45212 | 36 x 120 | 0.756 | 3.690792 | 22.68 | 10.27404 |
| 0.0178 | 0.45212 | 48 x 96 | 0.756 | 3.690792 | 24.19 | 10.95807 |
| 0.0178 | 0.45212 | 48 x 120 | 0.756 | 3.690792 | 30.24 | 13.69872 |
| 0.0235 | 0.5969 | 30 x 96 | 1.008 | 4.921056 | 20.16 | 9.13248 |
| 0.0235 | 0.5969 | 30 x 120 | 1.008 | 4.921056 | 25.20 | 11.4156 |
| 0.0235 | 0.5969 | 36 x 96 | 1.008 | 4.921056 | 24.19 | 10.95807 |
| 0.0235 | 0.5969 | 36 x 120 | 1.008 | 4.921056 | 30.24 | 13.69872 |
| 0.0235 | 0.5969 | 36 x 144 | 1.008 | 4.921056 | 36.29 | 16.43937 |
ASTM A240 Type 446 Sheet Weight Chart
| Size (mm) | Weight per (Kg) | Size(mm) | Weight per (Kg) |
|---|---|---|---|
| 4000 * 2000 * 2.0 | 136.0 | 3000 * 1500 * 5.0 | 191.0 |
| 4000 * 2000 * 3.0 | 204.0 | 4000 * 2000 * 5.0 | 340.0 |
| 2500 * 1250 * 4.0 | 106.0 | 2500 * 1250 * 6.0 | 159.0 |
| 3000 * 1500 * 4.0 | 153.0 | 3000 * 1500 * 6.0 | 230.0 |
| 4000 * 2000 * 4.0 | 272.0 | 4000 * 2000 * 6.0 | 408.0 |
| 2500 * 1250 * 5.0 | 133.0 |
Applications of ASTM A240 Type 446 Plate
Glass Manufacturing: Furnace rolls, annealing boxes, glass melting furnace components
Petrochemicals: High-temperature heaters, thermocouple protection tubes, combustion chambers
Power/Boilers: Boiler components, burner nozzles, heat exchangers
Exhaust Systems: Industrial flues, waste gas treatment equipment
446 SS Plates Price per ton
The price of Type 446 stainless steel (SS) plate typically ranges from $1,500 to $3,500 per metric ton (or net ton). The final price depends heavily on the producing mill, plate thickness, surface finish, and total order volume.
Regarding the procurement of ASTM A240 Type 446 plate, costs vary based on order quantity: small-batch or cut-to-size orders generally command higher prices. Thinner plates and special finishes (such as 2B or No. 1) often fall at the higher end of the price spectrum ($3,000 to $5,000 per ton), whereas the cost per ton for standard industrial heavy plates is relatively lower.
To get an accurate assessment for your project, consider the following details:What thickness and dimensions do you require?What volume or tonnage are you looking to purchase?Is there a specific finish (e.g., Hot Rolled Annealed, Polished) you need?
ASTM A240 Type 446 hot-rolled stainless steel plates Export records
1.Turkish industrial furnace manufacturer:
Supplied 48.6 metric tons of ASTM A240 Type 446 hot-rolled stainless steel plates (12 mm thick, 1,500 mm wide) for use in heat treatment furnace linings, burner components, and furnace doors operating at temperatures exceeding 1,000°C.
2.Saudi Arabian petrochemical furnace project:
Delivered 55.2 metric tons of Type 446 heat-resistant hot-rolled stainless steel plates for reformer furnace internals and radiant heat shields; surface finish: Hot-Rolled Annealed and Pickled (HRAP).
3.Egyptian glass manufacturing plant:
Supplied 29.5 metric tons of ASTM A240 Type 446 plates (8 mm to 16 mm thick) for glass furnace structural components and heat-resistant supports.
We provide EN 10204 3.1 material certificates (quality certificates) and can arrange inspections by third-party agencies such as SGS, BV, TUV, or Lloyd's Register upon customer request.
Quality Inspection
Each steel plate undergoes comprehensive quality inspections prior to shipment-including chemical composition analysis, tensile testing, hardness testing, ultrasonic testing (UT), dimensional verification, flatness checks, and Positive Material Identification (PMI)-to ensure material authenticity and full traceability.
High-Quality Packaging
Packaging: Each sheet or coil is wrapped in moisture-proof paper with a plastic film lining and secured with steel strapping. They are protected by wooden pallets or wooden crates to ensure safety during international transport.
Marking: Each package is marked with the heat number, grade, dimensions, and standard specifications.
FAQ
Q: What is the difference between 446 and 310S stainless steel?
A: Grade 446 stainless steel has a continuous service temperature of up to 1,100°C (2,000°F) and an intermittent service temperature of up to 1,150°C, making it highly suitable for furnace linings and heat-resistant structural components. Grade 310S stainless steel offers a higher continuous service temperature of up to 1,150°C (2,100°F) and is better suited for components subjected to frequent heating and cooling cycles.
Q: How can 475°C embrittlement in 446 stainless steel be avoided?
A: Grade 446 becomes brittle if held for extended periods within the 400°C–540°C temperature range; therefore, its use is not recommended for operating conditions falling within this range. Embrittlement resulting from processing can be eliminated by heating the material above 760°C followed by rapid water quenching.
Q: What is the hardness of hot-rolled 446 stainless steel plate?
A: According to the ASTM A240 standard, the maximum hardness for Grade 446 is 201 Brinell (HBW) and 92 Rockwell B (HRB). It cannot be hardened by heat treatment.
