321 grade is within austenitic stainless steels group, and is stabilised with Titanium (Ti).

Corrosion resistance is similar to 304L grade, and it is resistant to natural waters. Intergranular corrosion resistance is superior due to Titanium (Ti) addition.

Formability and weldability is good in 321 grade, similar to other austenitic grades. Machinability and forgeability is low. Heat resistance is up to 900°C.

This grade is non-magnetic in annealed condition. 321 grade is not polishable, therefore not suitable for decorative purposes.

Available forms: Round Bars, Flat Bars, Hexagon Bars, Coils, Sheets, Strips, Welded Tubes, Seamless Tubes, Profiles, Fittings.

Chemical Analysis

Chemical Compositions

Element % Present (in product form)
C, H, P L TW TS
Carbon (C) ≤0.08 ≤0.08 ≤0.08 ≤0.08
Silicon (Si) ≤1.00 ≤1.00 ≤1.00 ≤1.00
Manganese (Mn) ≤2.00 ≤2.00 ≤2.00 ≤2.00
Phosphorous (P) ≤0.045 ≤0.045 ≤0.0453) ≤0.040
Sulfur (S) ≤0.0151) ≤0.0301) ≤0.0153) ≤0.0151)
Chromium (Cr) 17.00 – 19.00 17.00 – 19.00 17.00 – 19.00 17.00 – 19.00
Nickel (Ni) 9.00 – 12.00 9.00 – 12.002) 9.00 – 12.00 9.00 – 12.002)
Titanium (Ti) 5xC to 0.70 5xC to 0.70 5xC to 0.70 5xC to 0.70
Iron (Fe) Balance Balance Balance Balance

Mechanical properties (at room temperature in annealed condition)

Product Form Max Thickness (mm) Yield Strength Tensile Strength Elongation min. in % Impact Energy (ISO-V) ≥ 10mm thick
0.2% Rp0.2 N/mm2 1% Rp1.0 N/mm2 Rm N/mm2 A1) %min (longitudinal) A1) %min (transverse) Jmin (longitudinal) Jmin (transverse)
C 8 2203) 2203) 520-7203) 40
H 13.5 2003) 2403) 520-7203) 40 100 60
P 75 2003) 2403) 500-7003) 40 100 60
L 160 1904) 2254) 500-7004) 40 100
L 2502) 1907) 2257) 500-7007) 30 60
TW 60 1805) 2155) 460-6805) 35 30 100 60
TS 60 1805) 2155) 460-6805) 35 30 100 60

Usage Areas

  • Food and beverage industry
  • Automotive industry
  • Chemical industry
  • Furnace parts
  • Aerospace
  • Heat exchangers
  • Mining industry
  • Boilers