321

Product Origin:Sweden Outokumpu/ POSCO China

Execution Standard:ASTM A240/ASME SA-240, ASTM A276, ASTM A182/ASME SA-182, ASTM A312/ASMES A312

Main Components: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

Physical Properties:Density of 321 Stainless Steel: 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, 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 C 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 Material:ER321

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