321/321H Stainless Steel

Alloy 321 (UNS S32100) is a titanium stabilized austenitic stainless steel with good general corrosion resistance.

Type 321 is basic type 304 modified by adding titanium in an amount at least 5 times the carbon plus nitrogen contents.

These titanium bearing stainless steels are stabilized against carbide precipitation and designed for eperation within the damaging temperature range where carbide precipitation develops. In this type of steel, the carbon combines preferentially with titanium to form a harmless titanium carbide, leaving the chromium in solution ot maintain full corrosion resistance.

Common Applications

Specifications -321/321H Stainless Steel

Chemical Composition - 321/321H Stainless steel

Grade 321 321H
UNS Designation S210000 S32109
Carbon (C) Max. 0.08 0.04 – 0.10
Manganese (Mn) Max. 2.00 2.00
Phosphorous (P) Max. 0.040 0.040
Sulphur (S) Max. 0.030 0.030
Silicon (Si) Max. 0.75 0.75
Chromium (Cr) 17.0 – 20.0 17.0 – 20..0
Nickel (Ni) 9.0 – 12.0 9.0 – 12.0
Molybdenum (Mo)
Nitrogen (N) 0.1 Max. 0.1 Max.
Iron (Fe) Bal. Bal.
Other Elements Ti=5(C) to 0.70% Ti=5(C) to 0.60%

*The titanium content shall not be less than 5 times the carbon content and not more than 0.60%.  321H requires the titanium content to be not less than 4 times the carbon content and not more than 0.60%.

Typical Mechanical Properties

Material Tensile Strength Rm, N/mm² Yield Strength Rp 0.2, N/mm²
% Elongation
Alloy 321 Tube
500-730 200 35

Design Features - 321/321H Stainless Steel

Typical Applications - 321/321H Stainless Steel

Tensile Requirements - 321/321H Stainless Steel


Alloy 321/H can be easily welded and processed by standard shop fabrication practices.

Hot Forming

Cold Forming



Corrosion Resistance