At Namo Alloy, we stock and export specialized Heat-Resistant Stainless Steel Sheets and Plates designed to perform where standard grades fail. Our range includes high-chromium and high-nickel alloys such as Grade 310/310S, 309, and 321, which offer exceptional resistance to oxidation and scaling at intermittent temperatures up to 1150°C. These sheets maintain high creep strength and structural integrity under extreme thermal cycling, making them indispensable for furnace linings, heat exchangers, boiler baffles, and exhaust systems. Every sheet is 100% mill-certified to ASTM A240 standards, ensuring the precise metallurgical balance required to prevent embrittlement and surface degradation in high-heat industrial environments.
| Grade | C (Max) | Mn (Max) | Si (Max) | P (Max) | S (Max) | Cr (Chromium) | Ni (Nickel) | N (Max) |
|---|---|---|---|---|---|---|---|---|
| SS 310 / 310S | 0.08 / 0.25 | 2.00 | 1.50 | 0.045 | 0.030 | 24.0 - 26.0 | 19.0 - 22.0 | - |
| SS 309 / 309S | 0.08 / 0.20 | 2.00 | 1.00 | 0.045 | 0.030 | 22.0 - 24.0 | 12.0 - 15.0 | - |
| Grade | Tensile Strength (MPa) min. | Yield Strength 0.2% Proof (MPa) min. | Elongation (% in 50mm) min. | Hardness (Rockwell B) max. | Scaling Temp (°C) |
|---|---|---|---|---|---|
| SS 310 / 310S | 515 | 205 | 40% | 95 HRB | 1150°C |
| SS 309 / 309S | 515 | 205 | 40% | 95 HRB | 1050°C |
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Specifications / Standards
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ASTM A240 / ASME SA240 ASTM A480 EN 10095 (Heat Resisting Steels) DIN 1.4845 / 1.4841 / 1.4828 UNS S31000 / S31008 / S30908 |
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Available Heat-Resistant Grades
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SS 310 / 310S (The Furnace Grade) SS 309 / 309S SS 321 / 321H (Titanium Stabilized) SS 347 / 347H 253MA / S30815 |
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SS 310S: Continuous up to 1050°C | Intermittent 1150°C SS 309S: Continuous up to 950°C | Intermittent 1050°C SS 321: Continuous up to 800°C - 900°C (Excellent resistance to carburizing and reducing environments) |
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Dimensions & Thickness
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Thickness: 0.5 mm to 50 mm Width: 1000mm, 1250mm, 1500mm, 2000mm Length: 2000mm to 6000mm & Custom Cut (Heavy thickness plates available for furnace hearth applications) |
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Surface Finishes
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No.1 (Hot Rolled, Annealed & Pickled) 2B (Cold Rolled) BA (Bright Annealed) Sand Blasted / Shot Blasted |
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Key Technical Features
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High Creep Strength Low Magnetic Permeability Oxidation Resistance Thermal Expansion Stability Sulphidation Resistance |
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Testing & Certificates
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EN 10204 3.1 MTC High-Temp Tensile Test Radiography & Ultrasonic Testing Intergranular Corrosion (IGC) Test Positive Material Identification (PMI) |
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Export Packaging
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Heavy-Duty Wooden Pallets Steel Edge Protectors Waterproof VCI Plastic Film Reinforced Metal Banding |
Namo Alloy is a leading stockist and global exporter of premium Stainless Steel, Carbon Steel, and High Nickel Alloys.
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