TP 321/321H

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Stainless Steel Pipes

TP 321/321H Stainless Steel

Reliable Steel excels as a premier stainless steel 321 pipe supplier, providing top-quality Stainless Steel Pipes & tubes. Our alloy 321 pipe products are produced to satisfy strict national and international requirements. We provide a wide choice of SS321 and SS321 materials in many diameters, wall thicknesses, lengths, and sizes. Our products are offered at reasonable market pricing for both national and worldwide customers and available in customized versions to suit specific needs.

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TP 321/321H tubes are austenitic stainless steel tubes specified by ASTM A312, known for their high-temperature strength and resistance to scaling and embrittlement. They are stabilized with titanium, which prevents carbide precipitation, making them suitable for applications up to 900°C. The primary difference is carbon content: 321 has a maximum of 0.08%, while 321H has a higher carbon range of 0.04% to 0.10%. They are used in demanding applications like aerospace, chemical processing, and heat exchangers.

Characteristics of 321 stainless steel include:

  • Excellent resistance against both general and intergranular corrosion.
  • Excellent creep and stress rupture strength together with oxidation resistance up to 816°C.
  • Good toughness at low temperatures; minimum yield strength of 205 MPa; minimum tensile strength of 515 MPa; density of 8027 kg/m³.
  • Melting point between 1398-1446°C and hardness of 217 Brinell yields durability.
  • Formability: Elongation of 40%.

Stainless Steel 321H Seamless Pipes

Stainless Steel 321H pipe is a stabilized austenitic stainless steel designed for high-temperature use (427-816°C / 800-1500°F). It has higher carbon content. It resists carbide precipitation, remains non-magnetic in the annealed condition, and can be hardened by cold working.

Stainless Steel 321/321H Pipes Equivalent Grades

STANDARD WERKSTOFF NR. UNS JIS EN
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9

SS 321/321H Pipes Chemical Composition

Element 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

Stainless Steel 321/321H Pipes Mechanical & Physical Properties

Element SS 321/321H
Density 8.0 g/cm3
Melting Point 1457 °C (2650 °F)
Tensile Strength Psi – 75000 , MPa – 515
Yield Strength (0.2%Offset) Psi – 30000 , MPa – 205
Elongation 35 %

Stainless Steel 321/321H Pipe Application

  • Oil and Gas Industry
  • Food Processing Industry
  • Heating
  • Water Supply Systems
  • Fabrication Industry
  • Power Plant