321 Stainless Steel Plate

Our 321 Stainless Steel Plate is composed of chromium, nickel, and titanium, which gives it excellent resistance to corrosion, particularly in high-temperature environments. The addition of titanium stabilizes the material, making it less prone to carbide precipitation during welding and heat exposure. This unique feature of 321 Stainless Steel Plate allows it to maintain its integrity and resist thermal fatigue, making it an ideal material for critical high-temperature applications. Available in various thicknesses, sizes, and finishes, the 321 Stainless Steel Plate is perfect for projects that require high-strength, heat-resistant materials. Whether you need a plate for structural or aesthetic purposes, this versatile material can be customized to meet your specific project requirements.

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Product Introduction

321 Stainless Steel Plate solves the paradox of high-temperature corrosion resistance and post-weld brittleness. Its titanium-stabilized chemistry (Ti ≥5xC content) traps carbon to prevent chromium carbide formation during thermal cycling (425–860°C range). Proven in jet engine exhausts, industrial kilns, and nuclear reactor piping, 321 outperforms 304H in cyclic oxidation while avoiding 347's costly niobium premium.

4 Breakthrough Advantages

Sensitization Shield

Eliminates intergranular corrosion risk after prolonged 550–800°C exposure (per ASTM A262 Practice E).

Thermal Agility

Maintains 620 MPa tensile strength at 600°C (vs. 304H's 480 MPa drop).

Acid Warfare Ready

Resists nitric acid (up to 20% @ 50°C) and weak sulfuric acid environments.

Fabrication Flexibility

Cold-rollable to 0.5mm thin sheets without edge cracking.

Critical Performance Benchmarks

Challenge	321 Plate	Alternative (304H)
Carbide Precipitation	0% at 675°C (1.000h hold)	12% grain boundary attack
Thermal Expansion	17.3 µm/m·°C (20–600°C)	18.7 µm/m·°C (higher stress buildup)
Post-Weld Ductility	35% elongation after 10 repair welds	22% (cracking after 5 welds)
Cost per Ton (6mm)	$4.200 (annealed)	3.800+3.800+1.500 heat treatment