321 Stainless Steel Sheet – Titanium-Stabilised Heat-Resistant Excellence
When engineers face continuous service between 400 °C and 800 °C, 321 Stainless Steel Sheet is the material they trust. By adding titanium (min. 5 × C content), this austenitic grade resists sensitisation and inter-granular corrosion that can plague standard 304 or 316 after welding or long-term thermal exposure. The titanium stabilisation ties up carbon as harmless TiC particles, leaving chromium free to maintain the passive film—so welds stay ductile and parent metal retains full corrosion resistance without post-weld annealing. Whether you fabricate jet-engine exhaust cones, chemical-refinery expansion joints, or high-temperature autoclave shells, 321 Stainless Steel Sheet delivers outstanding strength, oxidation resistance, and fabricability in one cost-effective solution.
Key Features & Advantages
- Titanium stabilised (Ti ≥ 5×C) – immunity to sensitisation and knife-line attack
- Service range –55 °C to 870 °C (intermittent) with good scaling resistance
- Excellent weldability – no post-weld stabilising heat treatment required
- Higher elevated-temperature creep strength than 304/316
- Smooth surface finishes – 2B, BA, HL, No. 4 – ideal for aerospace skins
- Non-magnetic in annealed condition; low magnetic permeability after cold work
- Full compliance – ASTM A240, ASME SA-240, EN 1.4541, PED 2014/68/EU
Technical Specifications
(Typical mill values, annealed condition)
Table 1 – Chemical Composition (ASTM A240)
| Element | Min % | Max % |
|---|---|---|
| Cr | 17.0 | 19.0 |
| Ni | 9.0 | 12.0 |
| Ti | 5×C | 0.70 |
| C | — | 0.08 |
| Mn | — | 2.00 |
| Si | — | 1.00 |
| P | — | 0.045 |
| S | — | 0.030 |
| Fe | Balance |
Table 2 – Mechanical & Physical Properties
| Property | Room Temp. | 650 °C (1200 °F) |
|---|---|---|
| Tensile Strength | 515 MPa (75 ksi) min. | 320 MPa (46 ksi) approx. |
| Yield Strength (0.2 %) | 205 MPa (30 ksi) min. | 150 MPa (22 ksi) approx. |
| Elongation in 2" | 40 % min. | 28 % |
| Hardness HRB | 92 max. | — |
| Density | 8.0 g/cm³ (0.289 lb/in³) | — |
| Thermal Expansion | 17.2 µm/m·K (20-100 °C) | — |
Available Sizes, Thicknesses & Finishes
| Thickness (mm) | Thickness (in.) | Standard Width × Length (ft) | Finish Options |
|---|---|---|---|
| 0.4 | 0.016 | 4 × 8, 4 × 10 | 2B, BA |
| 0.5 | 0.020 | 4 × 8, 5 × 10 | 2B, BA |
| 0.8 | 0.031 | 4 × 8, 4 × 10 | 2B, #4 |
| 1.0 | 0.039 | 4 × 8, 5 × 10 | 2B, #4, HL |
| 1.5 | 0.059 | 4 × 8, 4 × 10 | 2B, #4, HL |
| 2.0 | 0.079 | 4 × 8, 5 × 10 | 2B, HL, No. 1 |
| 3.0 | 0.118 | 4 × 8, 5 × 10 | 2B, HL, No. 1 |
| 6.0 | 0.236 | 4 × 8, 5 × 10 | No. 1 |
Custom coils, slit-to-width, circles, and perforated blanks available.
Product Variants & Market Information
- 321 sheet stainless steel – Same-day cutting from 0.4 mm to 25 mm, worldwide export packing.
- 321 stainless steel sheet china – Direct mill source in Jiangsu & Shanxi, ISO-9001 & PED approved, 15-day lead time FOB Shanghai.
- 321 stainless steel sheet for sale – >1,500 t ready stock, no MOQ, instant online pricelist.
- 321 stainless steel sheet manufacturers – Top-tier 4-high reversible mills, AOD refining, continuous annealing, surface tension leveling.
- 321 stainless steel sheet pricelist – Updated daily reflecting LME nickel and ferro-titanium; download PDF instantly after RFQ.
- 321 stainless steel sheet supplier – Global network of 12 warehouses, multilingual technical team, customs documentation included.
Main Applications
- Aerospace exhaust manifolds, turbine shrouds, after-burner liners
- Automotive turbo-charger housings, hot-side bellows
- Chemical processing expansion joints, flare tips, thermal oxidizers
- Petrochemical steam tracing, high-temperature gaskets
- Food industry continuous baking ovens, steriliser trays
- Power plant heat-exchanger shrouds, super-heater supports
Why Choose Us as Your 321 Stainless Steel Sheet Supplier
- ISO-9001 & PED certified mills, TÜV audited
- EN 10204 3.1 / 3.2 mill test certificates with every coil/sheet
- Water-jet, laser, plasma, and shear cutting within ±0.2 mm
- 24-hour global shipping from hubs in China, Europe, USA
- Neutral export packaging, fumigation-free wooden crates
- Live online 321 stainless steel sheet pricelist and instant freight calculator
Grade Comparison: 321 vs 304 vs 316 vs 321H vs 347
| Grade | Ti Content | C Max | Mo | Max Temp (intermittent) | Weld Post-Treat | Typical Relative Cost |
|---|---|---|---|---|---|---|
| 304 | 0 % | 0.08 % | 0 % | 870 °C | Not needed | 1.0× |
| 316 | 0 % | 0.08 % | 2-3 % | 870 °C | Not needed | 1.3× |
| 321 | ≥5×C % | 0.08 % | 0 % | 870 °C | Not needed | 1.2× |
| 321H | ≥4×C % | 0.10 % | 0 % | 870 °C | Not needed | 1.25× |
| 347 | Nb ≥ 10×C | 0.08 % | 0 % | 870 °C | Not needed | 1.3× |
FAQ – 321 Stainless Steel Sheet
-
What is the continuous operating temperature limit?
~850 °C in air; scaling becomes significant above 900 °C. -
How does titanium stabilisation work?
Titanium combines with carbon to form TiC, preventing chromium depletion at grain boundaries during welding or service 450–800 °C. -
Can I use 321 instead of 304 for cost saving?
321 costs ≈20 % more than 304 but saves post-weld annealing; economically justified for high-temp or cyclic service. -
What thicknesses are available from China stock?
0.4 mm to 25 mm in standard sheets; coils from 0.1 mm; all sizes ready for immediate sale. -
How often is the 321 stainless steel sheet pricelist updated?
Daily at 08:00 CST based on LME Ni and Fe-Ti indices; lock your price for 48 h with a 30 % deposit. -
Do you supply 321 stainless steel sheet metal screws?
Yes, we stock Phillips pan head and hex-washer screws in 316 & 321 to avoid galvanic corrosion. -
Who are the top global 321 stainless steel sheet manufacturers?
Leading mills include Outokumpu, Aperam, TISCO, Tsingshan, and Baosteel—our long-term partners. -
What documents accompany the shipment?
MTC EN 10204 3.1, dimensional report, packing list, commercial invoice, and bill of lading.