Heat-Resistant Austenitic Stainless Steel Plate for High-Temperature, Welding, and Heavy Industrial Applications
Heat-resistant austenitic stainless steel plate designed for high-temperature service, oxidation resistance, and reliable performance in demanding industrial environments.
Hot rolled 309/309S/309H stainless steel plate is widely used in high-temperature environments where standard 304/316 may lose performance faster. These grades provide strong oxidation resistance and good corrosion resistance in many industrial atmospheres. The main difference between 309, 309S, and 309H is carbon content—this affects weldability and creep strength at elevated temperatures.
| Item | Details |
|---|---|
| Grades | 309 (UNS S30900) / 309S (UNS S30908) / 309H (UNS S30909) |
| Common Standards | ASTM A240 / ASTM A480 / ASME SA240 (common references) |
| Finish (Typical) | No.1 / 1D (Hot Rolled, Annealed & Pickled), Black, Mill Finish (options) |
| Form | Hot Rolled Plate / Cut-to-length |
| Test Certificate | EN 10204 3.1 (available) |
| Specification | Range | Notes |
|---|---|---|
| Thickness | ~1.2 – 10 mm (common hot rolled range) | Thicker ranges may be available depending on mill & finish |
| Width | 600 – 3300 mm | Wide plate availability varies by mill |
| Length | 500 – 12000 mm | Cut-to-length available |
| Pallet Weight | ~1.0 – 10 MT | Export packing customized by destination |
309/309S/309H are chromium-nickel austenitic stainless steels built for heat resistance. Their higher chromium and nickel content supports oxidation resistance and strength at elevated temperatures. These plates are commonly used in boilers, furnaces, chemical equipment, and high-temperature processing lines.
| Grade | Carbon Level | Best For | Buyer Notes |
|---|---|---|---|
| 309 (S30900) | C ≤ 0.20% | General heat-resistant applications | Balanced option; confirm welding + service temperature requirements |
| 309S (S30908) | C ≤ 0.08% | Welding + corrosion resistance near weld zones | Often the most commonly produced grade in supply chains |
| 309H (S30909) | C 0.04–0.10% | Creep strength at elevated temperature | Preferred for higher-temp structural stability (application-dependent) |
| ASTM / UNS | Typical EN / DIN | Typical JIS |
|---|---|---|
| 309 (S30900) | 1.4828 (commonly referenced) | SUS309 |
| 309S (S30908) | 1.4833 (commonly referenced) | SUS309S |
| 309H (S30909) | Varies by standard | Varies by standard |
Equivalents can differ slightly by standard and product form. For projects, match the required standard + UNS first.
Below is a practical spec-style summary. Final values follow mill heat analysis on MTC.
| Element | Requirement / Range (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Silicon (Si) | ≤ 0.75 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 22.0 – 24.0 |
| Nickel (Ni) | 12.0 – 15.0 |
| Iron (Fe) | Balance |
For 309 and 309H, chromium and nickel ranges are commonly similar; the main difference is carbon level (see comparison table above).
| Property | Value | Notes |
|---|---|---|
| Tensile Strength | ≥ 515 MPa | Room temperature, plate form |
| Yield Strength (0.2%) | ≥ 205 MPa | Room temperature |
| Elongation | ≥ 40% | Good ductility for fabrication |
| Hardness | ≤ 217 HB (typ.) | Varies by condition/thickness |
| Property | Typical Value | At / Notes |
|---|---|---|
| Density | ~8.0 g/cm³ | Room temperature |
| Melting Range | ~1450°C (approx.) | Alloy-dependent |
| Heat Resistance | High-temperature service | Confirm by duty cycle & atmosphere |
The biggest difference is carbon content. 309S has lower carbon, which helps improve weldability and reduces sensitization risk in many welded parts.
309H is commonly selected for high-temperature applications where better creep resistance is needed. It uses higher carbon than 309S to support strength at elevated temperature.
These grades are designed for high-temperature service and oxidation resistance. The real limit depends on the duty cycle, atmosphere (air, sulfur-bearing gas, carburizing conditions), and part design—share your details for a correct recommendation.
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