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Located in the heart of Hamilton, New Zealand, Will Sheetsandplates is a trusted name for high-performance metals. We pride ourselves on connecting local industry with the materials it needs to thrive, and our Stainless Steel 309H sheets and plates are a perfect example. This grade is a specialist solution designed for extreme environments, offering exceptional resistance to heat and corrosion. We supply these robust materials to businesses across the region, ensuring they have the durable foundation required for their most demanding projects and applications.
The strength of Stainless Steel 309H comes from its carefully balanced composition, which includes higher levels of chromium and nickel for outstanding oxidation resistance. This is further enhanced by a controlled carbon content, which gives it superior creep strength, meaning it can handle sustained stress under high temperatures without deforming. Essentially, this combination of elements creates a material that doesn’t just withstand heat but actually performs consistently and reliably within those intense operating conditions.
| Specifications | ASTM A240 / ASME SA240 |
| Size | 1/4″ to 4″ |
| Range | 5mm To 150mm |
| Thickness | 4mm-100mm |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Surface | 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, checkered, embossed, hair line, sand blast, Brush, etching, etc |
| Finish | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated) |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Grade | C | Mn | Si | P | S | Cr | Ni | Fe | |
| SS 309 | 0.20 | 2 | 1 | 0.045 | 0.030 | 23 | 14 | 60 | |
| SS 309H | 0.04-0.10 | 2.0 | 0.75 | 0.045 | 0.03 | 22.0-24.0 | 15.0 | 58.0-63.0 | |
| Grade | Tensile Strengtd ksi (min) | Yield Strength 0.2% ksi (min) | Elongation % | Hardness (Brinell) max |
| 309/S | 75 | 30 | 40 | 95 |
| 309/H | 40 | 30 | 40 | 217 |
| STANDARD | WERKSTOFF NR. | UNS |
| SS 309H | 1.4833 | S30909 |
We provide products that come with both mill test certificates and third-party test certificates, ensuring the highest standards of quality and compliance.
Stainless steel 309H sheets and plates offer many advantages, including excellent resistance to high temperature oxidation and corrosion, making them ideal for harsh environments Due to the high carbon content they retain strength and staying power exist longer at high temperatures (up to 2000°F or 1093°C ). The material also boasts excellent resistance to heat fatigue, stress and cracking. Stainless steel 309H is highly weldable, ensuring ease of fabrication. It is also scratch resistant and can withstand acidic and basic environments. These properties make it suitable for industries such as aerospace, chemical processing and power generation.
You’ll typically find Stainless Steel 309H sheets and plates hard at work in some of industry’s toughest settings. They are a go-to material for constructing vital high-temperature components like industrial furnace parts, heat exchanger shells, and critical sections of thermal processing equipment. Their reliability also makes them an excellent choice for use in the petrochemical industry, as well as for manufacturing exhaust systems and other applications where materials are pushed to their thermal limits while needing to retain their structural integrity.
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