446 Stainless Steel Plate – Premium Ferritic Grade for Extreme Heat Resistance up to 1150°C
Meta Description: 446 Stainless Steel Plate – highest oxidation resistance up to 1150°C, excellent thermal conductivity. Competitive 446 stainless steel plate price from best 446 stainless steel plate distributor. Download 446 stainless steel data sheet.
Introduction – Why Choose 446 Stainless Steel Plate?
When your equipment must survive continuous exposure above 900°C, only 446 Stainless Steel Plate delivers the reliability you need. With 23–27 % chromium and virtually zero nickel, this ferritic 430 stainless steel plate offers excellent oxidation resistance up to 1150°C, superior thermal conductivity, and the lowest thermal expansion among stainless grades—making it the global standard for furnace radiant tubes, petrochemical crackers, and high-temperature architectural panels. Whether you need 446 stainless steel plate for kiln linings or high temperature 446 stainless steel plate for boiler baffles, our mill-direct supply ensures full traceability, rapid delivery, and competitive 446 stainless steel plate price.
[Image Placeholder 1: Large hot-rolled 446 stainless steel plate fresh from mill, showing typical scale]
Alt text: Large Hot-Rolled 446 Stainless Steel Plate – Typical Scale, Ready for High-Temp Service
Product Overview & Unique Advantages
- Ferritic structure – fully magnetic, ideal for sensors & induction heating
- Maximum heat resistance – 1150°C continuous, 1200°C intermittent
- Superior oxidation & sulfidation resistance in petrochemical atmospheres
- Lowest thermal expansion – reduced distortion under cyclic heating
- Highest thermal conductivity – 25 W/m·K (vs 16 W/m·K for 304)
- Lowest stainless price – 30–40 % cheaper than 310S
- Global supply – best 446 stainless steel plate distributor network
Chemical Composition of 446 Stainless Steel Plate
| Element | Min % | Max % |
|---|---|---|
| Cr | 23.0 | 27.0 |
| Mn | — | 1.50 |
| Si | — | 1.00 |
| C | — | 0.20 |
| P | — | 0.04 |
| S | — | 0.03 |
| Fe | Balance | Balance |
Extracted from official 446 stainless steel data sheet.
Mechanical & Physical Properties
Table 1 – Room Temperature Properties (ASTM A240)
| Property | Value |
|---|---|
| Yield Strength | ≥275 MPa |
| Tensile Strength | ≥515 MPa |
| Elongation | ≥20 % |
| Hardness HRB | ≤95 |
Table 2 – Elevated Temperature Properties
| Temp (°C) | Yield MPa | Tensile MPa | Oxidation Rate (mg/cm²·h) |
|---|---|---|---|
| 600 | ≥150 | ≥320 | ≤0.1 |
| 800 | ≥100 | ≥220 | ≤0.5 |
| 1000 | ≥80 | ≥180 | ≤2.0 |
Superior 446 stainless steel oxidation resistance up to 1150°C.
Physical Properties & Oxidation Resistance
| Property | Value |
|---|---|
| Density | 7.7 g/cm³ |
| Thermal Conductivity | 25 W/m·K |
| Thermal Expansion | 10.4 µm/m·K (20–100 °C) |
| Max Service Temp | 1150 °C continuous |
| Oxidation Limit | 1200 °C intermittent |
Highest 446 stainless steel oxidation resistance among ferritic grades.
430 vs 310 vs 309 vs 304 vs 321 Comparison Table
| Grade | Cr % | Ni % | Max Temp | Thermal Conductivity | Relative Cost | Best Use |
|---|---|---|---|---|---|---|
| 430 | 16–18 | ≤0.6 | 815 °C | 25 W/m·K | 0.6× | Appliances |
| 310 | 24–26 | 19–22 | 1150 °C | 16 W/m·K | 1.4× | Furnace radiant |
| 309 | 23–25 | 13–15 | 1050 °C | 16 W/m·K | 1.2× | Welded exhaust |
| 304 | 18–20 | 8–10.5 | 800 °C | 16 W/m·K | 1.0× (base) | General corrosion |
| 321 | 17–19 | 9–12 | 870 °C | 16 W/m·K | 1.1× | Welded high-temp |
430 vs 310 vs 309: 446 is 30–40 % cheaper and fully magnetic.
Available Specifications & Surface Finishes
| Thickness (mm) | Width (mm) | Length (mm) | Finish |
|---|---|---|---|
| 3–12 | 1250–2000 | 2000–12000 | No.1, pickled |
| 12–50 | 1500–2500 | 2000–12000 | HRAP |
| 50–100 | 1500–3000 | 2000–12000 | Forged |
Custom cut-to-size available.
High-Temperature Performance Guide
- Continuous service: 1100 °C (clean air)
- Intermittent service: 1200 °C (clean air)
- Oxidation rate at 1000 °C: ≤2.0 mg/cm²·h
- Scaling temperature: 1200 °C (intermittent)
- Creep strength at 900 °C: ≥80 MPa (typical)
Superior 446 stainless steel oxidation resistance up to 1150 °C.
Major Applications & Industries
- Furnace parts – radiant tubes, muffles, baskets
- Kiln linings – preheater shelves, car bottom plates
- Heat exchangers – shell-and-tube, plate-frame
- Boiler baffles – superheater supports, soot blowers
- Petrochemical crackers – reactor liners, collector boxes
- Incinerators – flare stacks, reactor shells
- Glass molds – crucibles, forming tools
- Thermal processing equipment – annealing boxes, conveyor belts
[Image Placeholder 2: Professional infographic of 446 stainless steel data sheet + oxidation resistance curve up to 1150°C]
Alt text: 446 Stainless Steel Data Sheet + Oxidation Resistance Curve up to 1150°C – Superior High-Temperature Performance
[Image Placeholder 3: Real installation photos – 446 plates used in furnace lining, heat treatment trays, and high-temperature conveyor belts]
Alt text: Real Applications of 446 Stainless Steel Plate – Furnace Lining, Heat Treatment Trays, High-Temperature Conveyor Belts
Why We Are the Best 446 Stainless Steel Plate Distributor
- Mill-direct pricing – 30–40 % cheaper than 310S
- 500 000 t annual high-temp alloy capacity – 5-day lead time
- EN 10204 3.1 & 3.2 MTC supplied with every plate
- In-house solution annealing to 1200 °C – full metallurgical control
- UK local stock + same-day dispatch – best 446 stainless steel plate distributor
- Real-time stock portal – 24/7 visibility for 446 stainless steel plate price
FAQ – 446 Stainless Steel Plate
Q1: What is the maximum continuous service temperature?
A: 1100 °C continuous, 1200 °C intermittent in clean air.
Q2: Is 446 stainless steel magnetic?
A: Fully ferritic – ideal for sensors & induction heating.
Q3: What is the creep strength at 900 °C?
A: ≥80 MPa (typical), superior to 309 at equivalent temperature.
Q4: What is the difference between 446 vs 310 vs 309 stainless steel?
A: 446 is 30–40 % cheaper, fully magnetic, and has higher thermal conductivity than 310/309.
Q5: Can 446 stainless steel plate be welded?
A: Yes – use 309 or 446 filler; post-weld anneal optional for most services.
Q6: What is the latest 446 stainless steel plate price?
A: Mill-direct FOB China USD 2.60–3.00/kg depending on chromium surcharge; fixed for 48 h.
Q7: What is the minimum order quantity?
A: One plate for stock sizes; full container (≈25 t) for mill-direct custom thickness.
Q8: Do you export worldwide?
A: Yes – to 80+ countries including UK, Germany, India, UAE, South Korea, and Australia.
Conclusion + Strong Call-to-Action
Stop paying nickel premiums. Contact the most trusted 446 stainless steel plate supplier today for the latest 446 stainless steel plate price, immediate access to massive 446 stainless steel sheets stock, and same-day cutting of any thickness or finish.