Stainless Steel 409M Explained
Stainless Steel 409M is a stabilized and modified version of Grade 409, developed to deliver enhanced corrosion resistance and superior high-temperature strength. With improved resistance to scaling, oxidation, and exhaust gas corrosion, 409M is extensively used in automotive exhaust manifolds, emission control systems, and thermal processing equipment. Its improved alloy chemistry provides better durability under cyclic heating and cooling conditions. Combining thermal stability, mechanical reliability, and economic performance, Stainless Steel 409M is a preferred grade for demanding automotive and industrial heat-resistant applications.
409M STAINLESS STEEL SHEETS AND PLATES EQUIVALENT GRADES
| STANDARD | COMMON NAME |
|---|---|
| SS 409M | HYFAB 3/12 |
SPECIFICATION OF STAINLESS STEEL 409M SHEETS AND PLATES
| Standard | ASTM A240 / ASME SA240 |
|---|---|
| Dimension Standard | JIS, AISI, ASTM, GB, DIN, EN, etc |
| Width | 1000mm, 1219mm, 1500mm, 1800mm, 2000mm, 2500mm, 3000mm, 3500mm, etc |
| Length | 2000mm, 2440mm, 3000mm, 5800mm, 6000mm, etc |
| Thickness | 0.3 mm to 120 mm |
| Form | Coils, Foils, Rolls, Plain Sheet, Shim Sheet, Perforated Sheet, Chequered Plate, Strip, Flats, Blank (Circle), Ring (Flange) etc. |
| Surface Finishing | Hot rolled plate (HR), Cold rolled sheet (CR), 2B, 2D, BA, NO.1, NO.4, NO.8, 8K, mirror, Chequered, embossed, hair line, sand blast, Brush, etching, SATIN (Met with Plastic Coated) etc. |
CHEMICAL COMPOSITION OF STAINLESS STEEL 409M SHEETS AND PLATES
| Grade | C% | Si% | Mn% | Cr% | Ni% | P% | S% | N% | Other Elements |
|---|---|---|---|---|---|---|---|---|---|
| SS 409M | 0.030 max | 1.00 max | 0.5-1.5 | 10.80-12.50 | 1.5 max | 0.040 max | 0.030 max | 0.03 max | – |
MECHANICAL PROPERTIES OF STAINLESS STEEL 409M SHEETS AND PLATES
| Tensile Strength (N/mm²) | Yield Strength (N/mm²) | Elongation (%) | Hardness (HRB) max | Cold Bend |
|---|---|---|---|---|
| 450 min | 275 min | 22 min | 92 | 180° 1 t |
Industries That Use Stainless Steel 409M Sheets and Plates
Stainless Steel 409M is widely used in industries requiring improved corrosion and thermal resistance in mild to moderately corrosive environments.
Primary application for exhaust and thermal components.
Uses
Exhaust manifolds, mufflers, heat shields, catalytic converter parts.
Why SS 409M?
Better thermal and corrosion resistance than 409L, with excellent weldability.
Used for heat shields, ducting, and mild corrosion environments.
Uses
Industrial ducts, furnace components, storage tanks.
Why SS 409M?
Improved oxidation resistance and durability under moderate heat and corrosion.
Used in structural and fabricated components exposed to mild corrosion.
Uses
Mildly corrosive enclosures, storage tanks, fabricated panels, and sheet metal components.
Why SS 409M?
Cost-effective ferritic stainless steel with good corrosion resistance, strength, and weldability.
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