In the demanding world of industrial fabrication, choosing a material that fails under heat is not an option. At Salem Stainless Steel Suppliers Pvt. Ltd., we recognize that your projects require materials that go beyond the capabilities of standard 304. That is why we specialize in the manufacturing and supply of premium SS 321 Plates. Whether you are looking for specialized Stainless Steel 312 Plates or high-strength 321 plates, our inventory is engineered to sustain the highest industry standards.
What makes SS 321 Plates Unique?
SS 321 (UNS S32100) is essentially the “big brother” to 304 stainless steel. While they share a similar base chemistry, 321 is stabilized with Titanium. According to industry norms, the titanium content in Stainless Steel 321 Plates must be at least five times the carbon content. This small chemical tweak creates a massive physical advantage: it prevents sensitization. SS 321 Plates are specially developed for applications where conventional 304 may become sensitized under elevated temperatures.
Many engineers face the dilemma of “sensitization”—a process where chromium carbides form at grain boundaries during welding or high-heat exposure, leading to rust and structural failure.
- Resistance to Sensitization: Unlike Alloy 304, which becomes vulnerable when heated, SS 321 Plates use titanium as a “decoy” to lock up carbon. This leaves the chromium free to protect the metal from corrosion.
- Advanced Potency at Soaring Temps: In environments where 312 plates or standard 304 lack hot potency (structural strength), 321 thrives. It maintains its mechanical integrity at temperatures where other steels begin to sag or scale.
Chemical Properties of Stainless Steel 321 Plates:
| Element | Symbol | Percentage (wt. %) |
|---|---|---|
| Chromium | Cr | 17.00 – 19.00 |
| Nickel | Ni | 9.00 – 12.00 |
| Titanium | Ti | 5 × (C + N) min – 0.70 max |
| Carbon | C | 0.08 max |
| Manganese | Mn | 2.00 max |
| Silicon | Si | 0.75 max |
| Nitrogen | N | 0.10 max |
Mechanical Properties of 321 Plates:
| Property | Metric Value | Imperial Value |
|---|---|---|
| Tensile Strength (R3) | 515 – 700 MPa | 75 – 101 ksi |
| Yield Strength (Rp0.2) | 205 MPa (min) | 30 ksi (min) |
| Elongation (A50) | 40% (min) | 40% (min) |
| Hardness (Brinell) | 217 HB max | 217 HB max |
| Hardness (Rockwell B) | 95 HRB max | 95 HRB max |
Physical Properties of 321 SS Plates:
| Property | Metric Value |
|---|---|
| Density | 7.92 g/cm³ |
| Melting Range | 1398 – 1446°C |
| Specific Heat | 500 J/kg·K (at 20°C) |
| Magnetic State | Non-Magnetic (Annealed) |
Product Specifications:
| Category | Technical Details |
|---|---|
| Steel Grade | AISI 321 / EN 1.4541 (Titanium Stabilized) |
| Manufacturing Process | Hot-Rolled (HR) |
| International Standards | ASTM A240 / ASTM A480 |
| Thickness Range | 3.0mm – 30.0mm (Custom sizes >30.0mm available on request) |
| Available Widths | 1000mm, 1250mm, 1500mm, 2000mm (Custom widths available) |
| Packaging Weight | 1.0 – 4.0 Tonnes per bundle |
| Primary Advantage | High-temperature stability & resistance to intergranular corrosion |
Key Applications of SS 321 Plates:
Due to their rugged nature, these plates are the preferred choice for several high-stress environments:
- Aerospace Engineering: Used in jet engine parts, exhaust stacks, and aircraft firewalls.
- Chemical Processing: Ideal for high-temperature chemical vats and thermal oxidizers.
- Expansion Joints: Their flexibility and heat resistance make them perfect for bellows and flexible hoses.
- Power Generation: Essential for boiler tubes, superheaters, and waste incinerators.
Get a Quote Today
Stop compromising on heat resistance. Purchase your SS 321 Plates at a sensible expense from the experts at Salem Stainless Steel Suppliers Pvt. Ltd.,
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