Stainless Steel Pipes
Stainless Steel Pipes Seamless 321H
ASTM A312 TP321H SS Seamless Pipes, Stainless Steel Pipes Seamless 321H Manufacturer, 321H Cold Drawn Pipes, SS 321H Pipes Exporter in India.
Reliable Pipes & Tubes – Stainless Steel Pipes Seamless 321H Manufacturer & Supplier
Stainless Steel Pipes Seamless 321H are titanium-stabilized austenitic stainless steel pipes designed to operate at high-temperature carbide precipitation ranges of 800 °F to 1500 °F (427 °C to 816 °C). Grade 321H has a controlled higher carbon content (0.04% - 0.10%) which provides enhanced creep strength and high-temperature resistance compared to standard 321.
Our stainless steel pipes seamless 321H are manufactured in compliance with ASTM A312 / ASME SA312 standards. Common applications include heat exchangers, industrial boilers, pressure vessels, chemical processing, pharmaceutical equipment, and petrochemical refineries.
The titanium addition (4 times minimum the carbon content) in stainless steel pipes seamless 321H prevents sensitization during welding. Reliable Pipes & Tubes offers these pipes in cut-to-length sizes, customized dimensions, and all standard schedules to match your project demands.
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Stainless Steel Pipes Seamless 321H Specification
| Specification |
Details |
| Outer Diameter Range | 1/8" NPS to 12" NPS (6 NB to 1200 NB) |
| Wall Thickness Range | 0.6 mm to 12.7 mm |
| Schedules | SCH 5, SCH 10, SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, SCH XXS |
| Specifications | ASTM A312 / ASME SA312 |
| Types | Round, Square, Rectangular, Hydraulic, Honed Tubes |
| Method of Manufacture | Cold Drawn, Hot Rolled |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End |
Stainless Steel Pipes Seamless 321H – Grade Standards
| Standard |
UNS Designation |
Werkstoff Number |
| SS 321 | S32100 | 1.4541 |
| SS 321H | S32109 | 1.4878 |
Chemical Composition of Stainless Steel Pipes Seamless 321H
| Grade |
Ni |
N |
Cr |
C |
Si |
Mn |
P |
S |
Ti |
| SS 321 |
9.00 - 12.00 |
0.10 max |
17.00 - 19.00 |
0.08 max |
1.00 max |
2.00 max |
0.040 max |
0.030 max |
5(C+N) min - 0.70 max |
| SS 321H |
9.00 - 12.00 |
0.10 max |
17.00 - 19.00 |
0.04 - 0.10 |
0.75 max |
2.00 max |
0.045 max |
0.030 max |
4(C+N) min - 0.70 max |
Mechanical Properties of Stainless Steel Pipes Seamless 321H
| Grade |
Tensile Strength (MPa) min |
Yield Strength 0.2% Proof (MPa) min |
Elongation (% in 50mm) min |
Hardness (HRB) max |
Hardness (HB) max |
| SS 321 |
515 |
205 |
40 |
95 |
217 |
| SS 321H |
515 |
205 |
40 |
95 |
217 |
Stainless Steel Pipes Seamless 321H – Grade Equivalents
| Grade |
UNS No |
British BS |
Euronorm Name |
Swedish SS |
Japanese JIS |
| SS 321 |
S32100 |
321S31 |
X6CrNiTi18-10 (1.4541) |
2337 |
SUS 321 |
| SS 321H |
S32109 |
321S51 |
X6CrNiTi18-10 (1.4878) |
- |
SUS 321H |
Physical Properties of Stainless Steel Pipes Seamless 321H
| Property |
Value |
| Density | 8027 kg/m³ |
| Elastic Modulus | 193 GPa |
| Mean Coefficient of Thermal Expansion (0-100°C) | 16.6 μm/m·°C |
| Mean Coefficient of Thermal Expansion (0-315°C) | 17.2 μm/m·°C |
| Mean Coefficient of Thermal Expansion (0-538°C) | 18.6 μm/m·°C |
| Thermal Conductivity (at 100°C) | 16.1 W/m·K |
| Thermal Conductivity (at 500°C) | 22.2 W/m·K |
| Specific Heat (0-100°C) | 500 J/kg·K |
| Electrical Resistivity | 720 nΩ·m |
Applications of Stainless Steel Pipes Seamless 321H
- Industrial Boilers and Heat Exchangers
- Oil Refinery and Petrochemical Equipment
- Pressure Vessels and Chemical Processing Plants
- Pharmaceutical & Food Processing Equipment
- Aerospace Engineering and Gas Turbine Components
- Thermal Oxidizers and High-Temperature Mineral Processing