446 Stainless Steel Sheet – Premium High-Temperature Ferritic Stainless for 1100 °C Service
When your equipment must survive continuous exposure above 900 °C, only 446 Stainless Steel Sheet delivers the reliability you need. With 27 % chromium and minimal nickel, this ferritic grade offers outstanding oxidation resistance up to 1100 °C, excellent thermal conductivity, and the lowest thermal expansion among stainless steels—making it the first choice for engineers, furnace builders, and petrochemical EPCs who demand maximum heat resistance at minimum cost.
Caption: 446 Stainless Steel Sheet – Mirror-finish coil, ready for high-temperature serviceIntroduction – Why Choose 446 Stainless Steel Sheet?
Unlike austenitic grades such as 304 or 310, 446 Stainless Steel Sheet is fully ferritic. This means:
- No nickel-induced thermal expansion spikes
- Superior thermal fatigue resistance under cyclic heating
- Full magnetic properties for induction heating applications
- 30–40 % lower cost than nickel-bearing grades
Whether you need 446 Stainless Steel Sheet for radiant tubes, exhaust manifolds, or architectural cladding, our mill-direct supply ensures full traceability, rapid delivery, and competitive pricing.
Key Features & Benefits
- Maximum heat resistance – continuous service to 1100 °C
- Excellent oxidation & sulfidation resistance in petrochemical atmospheres
- Low thermal expansion – reduced distortion at temperature
- High thermal conductivity – superior to 304/310
- Fully magnetic – ideal for sensors & induction heating
- Cost-effective – 30–40 % cheaper than 310S
- Wide finish range – 2B, BA, No.1, brushed, embossed
Technical Specifications
Table 1 – Chemical Composition (ASTM A240)
| Element | Min % | Max % |
|---|---|---|
| Cr | 27.0 | 30.0 |
| Mn | — | 1.50 |
| Si | — | 1.00 |
| C | — | 0.20 |
| P | — | 0.04 |
| S | — | 0.03 |
| Fe | Balance | Balance |
Table 2 – Mechanical Properties (ASTM A240)
| Condition | Yield MPa | Tensile MPa | Elongation % | Hardness HRB |
|---|---|---|---|---|
| Annealed | ≥275 | ≥515 | ≥20 | ≤95 |
| 800 °C | ≥150 | ≥320 | ≥15 | — |
| 1000 °C | ≥80 | ≥180 | ≥10 | — |
Data extracted from general industry specifications.
Table 3 – Available Sizes & Dimensions
| Thickness (mm) | Width (mm) | Length (mm) | Finish |
|---|---|---|---|
| 0.3–3.0 | 1000–1524 | 2000–6000 | 2B, BA |
| 3.0–12.0 | 1250–2000 | 2000–12000 | No.1 |
| 12–50 | 1500–2500 | 2000–12000 | HRAP |
| 50–100 | 1500–3000 | 2000–12000 | Forged |
Custom cut-to-size available.
Applications of 446 Stainless Steel Sheet
- Furnace radiant tubes – continuous 1100 °C flue gas
- Petrochemical crackers – reactor liners, collector boxes
- Power-station superheaters – tubesheets, shields
- Automotive exhaust manifolds – turbo-charger ducts
- High-temp architectural panels – magnetic, thermal-stable
- Magnetic white goods – induction-compatible skins
- Thermal fatigue parts – cyclic heating/cooling loops
- Catering equipment – magnetic, food-safe surfaces
Benefits vs Other Grades
| Feature | 446 | 310S | 304 |
|---|---|---|---|
| Max Temp | 1100 °C | 1150 °C | 800 °C |
| Thermal Expansion | 10.4 µm/m·K | 15.9 µm/m·K | 17.2 µm/m·K |
| Thermal Conductivity | 25 W/m·K | 16 W/m·K | 16 W/m·K |
| Price Ratio | 0.7× | 1.4× | 1.0× (base) |
Processing & Fabrication Tips
- Annealing: 800–900 °C, air cool
- Forming: Use generous bend radii; pre-heat above 200 °C for thick sections
- Welding: Use 309 or 446 filler; post-weld anneal optional for most services
- Cutting: Laser, plasma, waterjet; avoid excessive heat input
Why Choose Our 446 Stainless Steel Sheet
- Mill-direct pricing – 30–40 % cheaper than 310S
- 500 000 t annual capacity – 5-day lead time
- ISO 9001 & PED certified – EN 10204 3.1 MTC supplied
- In-house brushing & embossing – Ra ≤0.2 μm mirror finish
- Same-day cutting & protective film – tolerances ±0.2 mm
- Real-time stock portal – 24/7 visibility for any thickness
Caption: 446 Stainless Steel Sheet – High-Temperature Production Line, Ready for Furnace ApplicationsGrade Comparison Table: 446 vs 310S vs 304 vs 441 vs 409
| Grade | Cr % | Ni % | Thermal Conductivity | Relative Cost | Best Use |
|---|---|---|---|---|---|
| 446 | 27–30 | ≤0.6 | 25 W/m·K | 0.7× | High-temp radiant |
| 310S | 24–26 | 19–22 | 16 W/m·K | 1.4× | Furnace linings |
| 304 | 18–20 | 8–10.5 | 16 W/m·K | 1.0× (base) | General corrosion |
| 441 | 17.5–19.5 | ≤0.5 | 25 W/m·K | 0.7× | Automotive exhaust |
| 409 | 10.5–11.75 | ≤0.5 | 25 W/m·K | 0.5× | Car exhaust pipes |
Frequently Asked Questions (FAQ)
Q1: What is the maximum service temperature for 446 Stainless Steel Sheet?
A: 1100 °C continuous, 1150 °C intermittent in clean air.
Q2: Is 446 Stainless Steel Sheet magnetic?
A: Fully ferritic – ideal for induction heating and sensor applications.
Q3: How does the price compare to 310S?
A: 30–40 % cheaper than equivalent 310S finish.
Q4: Can I get a mirror finish?
A: Yes – BA or 8K mirror up to Ra ≤0.2 μm.
Q5: Is welding difficult?
A: Use 309 or 446 filler; post-weld anneal optional for most services.
Q6: What embossed patterns are available?
A: Diamond, linen, ripple, custom logos – 430 embossed sheet stainless steel equivalent.
Q7: What is the minimum order?
A: One sheet 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.
Call-to-Action
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Caption: Massive Stock – 446 Hot Rolled Stainless Steel Sheet for Sale Factory & Wholesaler, Mill-Direct Prices Worldwide