Alloy 321/321H


Introduction :

Fortune Ferroment Inc provides all products such as Pipes, fittings, flanges, and bars made of alloy 321/321H and offer benefits for your business. Here are the two biggest benefits you’ll notice after using alloy 321H:

Resistance to corrosion – As we mentioned above, alloy 321H stainless steel provides highest resistance to corrosion and oxidation. This resistance to oxidation adds to the creep strength of the metal, connotation the ability of the metal to preserve its shape.

Welding – Alloy 321H is an austenitic stainless steel, so when you heat it to 1800°F, the metal develops soft and malleable. In fact, many consider the alloy 321/321h one of the easiest metals to weld because titanium reinforces its shape and it does not easily crack.


  • Immune to intergranular corrosion when heated within the carbide precipitation range.
  • Maybe susceptible to chloride stress cracking.
  • Excellent weldability in the field.
  • Type 321H has high carbon (.04-.10) for better high temperature creep properties.

Chemical Composition of Alloy 321/321H

Grade C Mn Si P S Cr N Ni Ti
SS 321 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 19.00 0.10 max 9.00 – 12.00 5(C+N) – 0.70 max
SS 321H 0.04 – 0.10 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 19.00 0.10 max 9.00 – 12.00 4(C+N) – 0.70 max

Mechanical Properties of Alloy 321/321H

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1457 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %


Equivalent Grades for 321/321H :-

SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9



Alloy 321/321h Avaliability

Alloy 321/321h Specifications

Alloy 321/321h Tensile Requirements