Stainless steel grade 321 UNS S32100 technical data

321 grade stainless steel UNS S32100 is a high-performance material widely used in many fields. Its chemical composition is unique, with carbon content not exceeding 0.08%, manganese content ≤ 2.00%, phosphorus ≤ 0.045%, sulfur ≤ 0.030%, silicon ≤ 0.75%, chromium content ranging from 17.00% to 19.00%, nickel content ranging from 9.00% to 12.00%, and titanium content ranging from 5 × (C+N) minimum to 0.70% maximum.

In terms of physical properties, 321 grade stainless steel has a density of 7.92g/cm³, a melting point range of 1371-1400℃, a thermal conductivity of 16.3W/(m.K) at 100℃, a resistivity of 72 μΩ. cm at 20℃, a linear thermal expansion coefficient of 16.6 × 10 ⁻⁶/℃ at 20-100 ℃, an elastic modulus of 193GPa, and is often non-magnetic.

321 grade stainless steel mechanical properties are also outstanding. After annealing treatment, the tensile strength is ≥ 515MPa, the yield strength is ≥ 250MPa, the elongation rate is ≥ 40%, and the hardness is ≤ RB95.

In terms of corrosion resistance, it is similar to 304 stainless steel in the annealed state. However, caution should be taken in environments containing chloride ions, and the corrosion resistance may change during long-term use in specific high temperature ranges.