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321H stainless steel is a widely used stainless steel, where parts are heated within carbide-precipitation temperature range (800°F-1500°F) and exposed to corrosive atmosphere. 321 stainless steel is similar to 304 stainless steel, but with higher nickel content and stabilized with titanium.
Titanium preferentially reacts with carbon in the steel and prevents precipitation of chromium carbides at the grain boundaries, thus preserving corrosion-resistant properties by preventing depletion of chromium near the grain boundaries during exposure within critical temperature range. This grade responds well to hardening by cold working.
321H, is a titanium stabilized austenitic stainless steel that is known for its general corrosion resistance. This higher carbon version of Type 321 stainless steel offers a wide variety of benefits including:
Excellent resistance oxidation to 1500°F (816°C)
Good low temperature toughness
Comparable corrosion resistance and machinability to Type 304
Readily welded by most standard processes
Very ductile and forms easily
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Cr | Ni | Ti |
321H | 0.04-0.1 | 2.0 | 0.045 | 0.03 | 0.75 | 17.0-19.0 | 9.0-12.0 | 4*(C+N)-0.7 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
321H | 75【515】 | 30【205】 | 40 | 217 |
Density: 7.9 g/cm3
Stainless steel 321H Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Stainless steel 321H ASTM Specification
Pipe, | Tube, | Tube , | Sheet/Plate | Bar /Rod | Forging /Flange | BW Fittings |
ASTM A312 | ASTM A269 | ASTM A213 | ASTM A240 | ASTM A276/A479 | ASTM A182 | ASTM A403 |
Stainless steel 321H Application：
Chemical and Petrochemical processing
Pharmaceutical production
Waste treatment including thermal oxidizers
Equipment and storage units for Food processing
Aerospace applications
