Stainless Steel 316H Seamless Pipes & Tubes Manufacturer & Supplier
SS 316H (UNS S31609) is the high-carbon version of 316, with carbon controlled to 0.04-0.10%. It combines the molybdenum-enhanced corrosion resistance of 316 with superior creep strength at elevated temperatures (425-816C). This makes it the preferred choice for high-temperature service in corrosive environments where both properties are essential.
UNS: S31609 | Category: Austenitic Stainless Steel | Werkstoff Nr: 1.4919 | EN Name: X6CrNiMoTi17-12-2
Size Range
Outer Diameter: 1/4" NPS to 10" NPS (6.35mm to 273.1mm OD)
Wall Thickness: SCH 5S to SCH 160, XXS
Chemical Composition (%)
| C | Mn | Si | Cr | Ni | Mo | P | S |
|---|---|---|---|---|---|---|---|
| 0.04-0.10 | 2.00 max | 0.75 max | 16.0-18.0 | 10.0-14.0 | 2.0-3.0 | 0.045 max | 0.030 max |
Mechanical Properties
- Tensile Strength
- 515 MPa min
- Yield Strength
- 205 MPa min
- Elongation
- 35% min
- Hardness
- 95 HRB max
Physical Properties
- Density
- 7.98 g/cm3
- Melting Range
- 1375-1400 C
- Thermal Conductivity
- 16.3 W/m-K
- Electrical Resistivity
- 740 nOhm-m
- Specific Heat
- 500 J/kg-K
- Coeff. of Thermal Expansion
- 15.9 um/m-C
Corrosion Resistance
- Pitting Resistance (PREN)
- ~24
- Max Service Temp (Oxidizing)
- 870 C (continuous)
- Intergranular Corrosion
- Susceptible if sensitized (higher carbon)
- Stress Corrosion Cracking
- Better than 304H in chlorides
- General Corrosion Rate
- <0.05 mm/yr in most acids
- Seawater Resistance
- Moderate - better than 304
Applicable Standards
- ASTM A312 / ASME SA312
- ASTM A213 / ASME SA213
- ASTM A269
- DIN EN 10216-5
Applications
- High-temperature service (425-816C) in corrosive environments
- Power plant superheater tubes with chloride exposure
- Petrochemical furnace tubes with acid contact
- Refinery heater tubes requiring Mo for corrosion
- Chemical plant heat exchangers at elevated temps
- Boiler tubes in marine/offshore environments
Industries Served
- Power Generation
- Petrochemical
- Chemical Processing
- Marine
- Refineries
- Boiler & Pressure Vessels
Key Advantages
- Superior creep strength at 425-816C with Mo-enhanced corrosion resistance
- Higher carbon provides better high-temperature rupture properties
- Better chloride resistance than 304H due to molybdenum content
- ASME approved for high-temperature pressure vessel service
- Excellent for boiler and superheater applications in corrosive environments
- Combines best of high-temp strength and pitting resistance
Equivalent Grades
- ASTM
- TP316H
- JIS
- SUS 316HTB
- BS
- 316S51
- GOST
- 08Kh17N13M2T