Inventory Details

321

Main Ingredients

Carbon (C)

≤ 0.08

Manganese (Mn)

≤ 2.0

Nickel (Ni)

9.0～12.0

Silicon (Si)

≤ 1.0

Chromium (Cr)

17.0～19.0

Sulfur (S)

≤ 0.030

Phosphorus (P)

≤ 0.035

Titanium (Ti)

5C～0.7

Product features

Product Origin

Sweden Outokumpu/ POSCO China
Execution Standard

ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312
Physical Properties

Density: 7.98g/cm3
Mechanical Properties

Tensile Strength: σb ≥ 520Mpa

Yield Strength σb ≥ 205Mpa

Elongation: δ ≥ 40%

Hardness ≤ 187 (HB)
Corrosion Resistance

321 stainless steel is a Ni-Cr-Mo austenitic stainless steel, where its performance is very similar to 304, but due to the addition of titanium, it has better intergranular corrosion resistance and high-temperature strength. The addition of titanium effectively controls the formation of chromium carbide. 321 austenitic stainless steel has good corrosion resistance in the atmosphere and is widely used in industries such as petrochemical, electric power, bridges, and automobiles. However, the "stainless" of stainless steel is not absolute. Due to special service environments, stainless steel can also corrode. Factors such as medium concentration, pH value, and temperature will have a significant impact on the corrosion resistance of stainless steel. For example, long-term use within the sensitization temperature range of 450~850°C will cause intergranular corrosion of stainless steel. The mechanism is the presence of carbon atoms at the grain boundaries.
Application Fields

Oil and natural gas industry equipment; offshore platforms, heat exchangers, underwater equipment, firefighting equipment; chemical processing industry, vessels, and piping industry; desalination, high-pressure RO equipment, and submarine pipelines; energy industry such as power plant flue gas desulfurization and denitrification (FGD) systems, industrial washing systems, absorption towers; mechanical components (high strength, corrosion-resistant, wear-resistant components).
Matching Welding Materials

ER321

Our Partners

Aerospace and Aviation

Our materials jointly fend off corrosion from high-altitude moisture, fuel residues, and extreme atmospheric conditions, endure intense temperatures and extreme pressure changes, fit both core operations and routine equipment needs, ensuring safe flight operations, minimal maintenance demands, and long-lasting reliability for commercial jets, military aircraft, and spacecraft.

Marine Engineering

Our materials collectively resist corrosion from saltwater, seawater mist, and marine organisms, withstand extreme temperatures and pressure fluctuations, suit both critical operations and general equipment needs, ensuring safe marine operations, low-maintenance costs, and long-lasting industrial performance in harsh ocean environments.

Petrochemical industry

Our materials collectively resist corrosion from harsh substances like acids and chlorides, and withstand high temperatures in demanding processes. These materials suit both critical operations and general equipment needs to ensure safe, low-maintenance, and long-lasting industrial operations.

Automotive

Our materials collectively resist corrosion from road salts, moisture, and engine fluids, withstand high temperatures in powertrain and exhaust systems, suit both critical operations and general equipment needs, ensuring safe vehicle performance, low-maintenance requirements, and long-lasting durability under daily driving and harsh road conditions.

Biopharmaceuticals

Our materials collectively resist corrosion from harsh bioprocess fluids, withstand stable temperatures in precise production processes, suit both critical operations and general equipment needs, ensure safe drug production, low-maintenance facility running, and long-lasting industrial operations that meet strict regulatory standards.

Construction & Infrastructure

Our materials jointly fend off corrosion caused by rainfall, dampness, and urban contaminants—key for withstanding outdoor exposure—bear heavy weights and harsh weather, fit both vital applications and everyday equipment uses, guaranteeing safe infrastructure operation, reduced upkeep expenses, and enduring structural reliability for public and commercial developments.

Electronics

Our materials jointly resist corrosion from moisture, dust, and chemical coolants, endure stable temperatures in high-heat components, fit both core operations and routine equipment needs, ensuring reliable electronic performance, reduced maintenance efforts, and long-lasting durability for consumer gadgets, industrial controls, and telecom hardware.

Energy Industry

Our materials jointly ward off corrosion from fuel byproducts, high-pressure fluids, and environmental elements, endure extreme temperatures in power generation and transmission, fit both core operations (oil/gas well casings, renewable energy hardware) and routine equipment needs, ensuring safe energy production/transmission, cut maintenance costs, and long-term reliability across fossil fuel and clean energy sectors.

Environmental industry

Our materials collectively resist corrosion from industrial waste, acidic/alkaline effluents, and chemical treatments, withstand temperature variations in waste processing and water treatment systems, suit both critical operations and general equipment needs, ensuring safe environmental remediation, low-maintenance facility upkeep, and long-lasting performance in waste management and sustainability-focused processes.

Medical

Our materials collectively resist corrosion from sterilizing agents and bodily fluids, maintain structural stability in precision medical devices, suit both critical operations and general equipment needs, ensure safe patient care, low-maintenance device upkeep, and long-lasting performance that meets strict medical regulatory standards.