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At Mitchell Stainless in Hamilton, New Zealand, we supply high-quality stainless steel sheets and plates built to perform in high-temperature and demanding industrial environments. Our Stainless Steel 309H Sheets and Plates are specifically designed for elevated temperature service, offering excellent resistance to oxidation, scaling, and heat-related corrosion. With higher carbon content for added strength at high temperatures, 309H is a trusted choice for thermal and industrial applications. Backed by Mitchell Stainless’ local expertise and commitment to quality, these sheets and plates deliver reliability, durability, and long-term performance where heat resistance truly matters.
Stainless Steel 309H Sheets and Plates are an austenitic stainless steel alloy containing high levels of chromium and nickel, along with increased carbon content. This composition enhances high-temperature strength while maintaining excellent resistance to oxidation and corrosion. The material offers good tensile strength, toughness, and structural stability under prolonged heat exposure. Stainless Steel 309H retains its mechanical integrity at elevated temperatures, making it suitable for applications requiring sustained thermal resistance, durability, and reliable performance in harsh industrial environments.
| Specifications | : | ASTM A240 / ASME SA240 |
| Standard | : | ASTM, ASME and API |
| Thickness | : | 4.0mm – 100mm |
| Specialize | : | Shim Sheet, Perforated Sheet, B. Q. Profile. |
| Form | : | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) |
| Finish | : | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA NO(8), SATIN (Met with Plastic Coated) |
| Hardness | : | Soft, Hard, Half Hard, Quarter Hard, Spring Hard etc. |
| Grade | : | SS 309H, (UNS S30909) |
| Grade | Si | Cr | Ni | Mn | Si | C | P | S |
| SS 309H | 0.75 | 22.0-24.0 | 12.0-15.0 | 2.00 | 0.75 | 0.04-0.10 | 0.045 | 0.030 |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 309H | 515 | 205 | 40 | 95 | 217 |
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Due to excellent corrosion resistance, these sheets are manufactured at very high temperatures. Mechanical properties are improved by that manufacturing process. They are available with thicknesses in range of 3 mm up to 50 mm and width up to 2000 mm for structural and industrial applications.
The cold rolled plates were produced at room temperature with a polish finish. The plates come in various thicknesses from 0.5 mm to 6 mm and widths as much as 1500 mm making it very ideal for precision and aesthetic purposes.
These plates offer excellent corrosion resistance and a textured surface for improved grip and slip resistance. They are usually available in thicknesses from 3 mm to 10 mm and dimensions up to 2000 mm x 1000 mm, and are used in flooring and safety applications.
The perforated sheet has strong resistance to corrosion with various hole patterns for functional as well as for aesthetic purposes. Sizes are commonly between 0.5 and 6 mm in thickness, and up to 2000 mm x 1000 mm in dimensions to be used in filtration and ventilation.
These thin sheets give good corrosion resistance and are applied to spacing and levelling accurately. The availability is as thin as 0.1 mm, with up to 1000 mm width. These sheets are of crucial use for aligning machinery and construction work.
Polished plates offer excellent resistance to corrosion with a highly reflective finish through polishing. They have thicknesses in the range of 1-20 mm, and their dimensions could go up to 2000 mm x 1000 mm, commonly being used in decoration and architecture applications.
Mitchell Stainless is a leading supplier and stockist of high-quality stainless steel 309H sheet and plates in Hamilton, New Zealand. Our products are widely used in various applications, and we are committed to delivering excellent service, resulting in high customer satisfaction. Our unique finishing techniques further distinguish us in the stainless steel industry. We are dedicated to consistently providing superior products and effectively meeting our customer’s needs.
Stainless Steel 309H Sheets and Plates are widely used in high-temperature industrial applications. Common uses include furnace components, heat exchangers, boilers, kilns, petrochemical equipment, and thermal processing systems. They are also suitable for power generation facilities and industrial structures exposed to continuous heat. At Mitchell Stainless, we supply 309H Sheets and Plates for projects where strength and oxidation resistance at elevated temperatures are essential. Their excellent heat resistance and mechanical stability make them a dependable choice for industrial, thermal, and heavy engineering applications requiring long-lasting stainless steel solutions.
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