AISI 321 Stainless Steel Sheet&Plate

321 stainless steel plates/sheet |East King

INTRODUCTION:

SUS321 stainless steel (UNS S32100) is a stainless steel with very good stability.321 stainless steel is a material with excellent high-temperature stress rupture (Stress Rupture) performance and high-temperature creep resistance (Creep Resistance) stress mechanical properties are superior to 304 stainless steel.

321 CHEMICAL COMPOSITION: 

EQUIVALENT GRADES

German Grade: X10CrNiTi189

Domestic Grade: 0Cr18Ni10Ti

CHARACTERISTICS

Type: Ni-Cr-Mo austenitic stainless steel.

Comparison to 304: Similar in performance, but with the addition of titanium for improved resistance to grain boundary corrosion and enhanced high-temperature strength.

Corrosion Resistance: Excellent in atmospheric conditions. Widely used in the petrochemical, electric power, bridge, and automotive industries.

IMPORTANT NOTES

Grain Boundary Corrosion: Due to the addition of titanium, 321 stainless steel effectively controls the formation of chromium carbide, reducing the risk of intergranular corrosion.

Service Environment: While stainless steel is known for its corrosion resistance, it is not completely immune to corrosion, especially under specific environmental conditions. Factors like medium concentration, pH value, and temperature can significantly impact its corrosion resistance.

Intergranular Corrosion: At sensitization temperatures of 450~850°C, prolonged use may lead to intergranular corrosion. This occurs due to the formation of chromium carbide (Cr23C6) at grain boundaries, which depletes chromium and increases the risk of corrosion when Cr content drops below 12%.

INDUSTRY APPLICATION:

Used in outdoor open-air machines that require high chemical, coal, and petroleum industries to resist grain boundary corrosion, heat-resistant parts for building materials, and parts with difficult heat treatment

1. Petroleum waste gas combustion pipeline

2. Engine exhaust pipe

3. Boiler shell, heat exchanger, heating furnace parts

4. Silencer parts for diesel engines

5. Boiler and pressure vessel

6. Chemical truck

7. Expansion joint

8. Spiral welded pipes for furnace pipes and dryers

PHYSICAL PROPERTIES:

The physical properties of alloys 321 and 347 are quite similar, in fact, they can be regarded as the same. The values listed in the table apply to both alloys.

If properly annealed, alloys 321 and 347 stainless steel mainly contain austenite and titanium carbide or niobium carbide. A small amount of ferrite may or may not appear in the microstructure. If exposed to temperatures between 1000°F-1500°F (593°C-816°C) for a long time, a small amount of sigma phase may form.

Heat treatment cannot harden the stable alloys 321 and 347 stainless steel.

In addition to the thermal conductivity of the metal, the total heat transfer coefficient of the metal also depends on other factors. In most cases, the film heat dissipation coefficient, rust and metal surface conditions. Stainless steel can keep the surface clean, so its heat transfer is better than other metals with higher thermal conductivity.

Permeability

The stable alloys 321 and 347 are generally not magnetic. In the annealed state, its magnetic permeability is lower than 1.02. Permeability will change due to composition and increase due to cold work. The permeability of welds containing ferrite will be higher.