Chemical Analysis
Weight % (all values are maximum unless a range is otherwise indicated)
| Element | 316H | 316 | 316L |
|---|---|---|---|
| Chromium | 16.0 min.-18.0 max. | 16.0 min.-18.0 max. | 16.0 min.-18.0 max. |
| Nickel | 10.0 min.-14.0 max. | 10.0 min.-14.0 max. | 10.0 min.-14.0 max. |
| Molybdenum | 2.00 min.-3.00 max. | 2.00 min.-3.00 max. | 2.00 min.-3.00 max. |
| Carbon | 0.04 – 0.10 | 0.08 | 0.030 |
| Manganese | 2.00 | 2.00 | 2.00 |
| Phosphorus | 0.045 | 0.045 | 0.045 |
| Sulfur | 0.030 | 0.030 | 0.030 |
| Silicon | 0.75 | 0.75 | 0.75 |
| Nitrogen | – | 0.10 | 0.10 |
| Iron | Balance | Balance | Balance |
Physical Properties
Density
0.285 lbs/in3
8.00 g/cm3
Electrical Resistivity
74 Microhm-cm at 20°C
29.1 Microhm-in at 68°F
Melting Range
2507 – 2552°F
1375 – 1400°C
Thermal Conductivity 212°F (100°C)
8.7 BTU/hr/ft2/ft/°F
15 W/m-°K
Mean Coefficient of Thermal Expansion
| Temperature Range | |||
|---|---|---|---|
| °F | °C | in/in °F | cm/cm °C |
| 68-212 | 20-100 | 8.9 x 10-6 | 16.0 x 10-6 |
Mechanical Properties
Values at 68oF (20oC) (minimum values, unless specified)
| Yield Strength .2% Offset | Ultimate Tensile Strength | Elongation in 2 in. | Hardness | ||
|---|---|---|---|---|---|
| psi (min.) | (MPa) | psi (min.) | (MPa) | % | |
| 30,000 | 205 | 75,000 | 515 | 40 | 95 Rockwell B |
316H also has a requirement for a grain size of ASTM No. 7 or coarser.
Corrosion Resistance
In most instances the corrosion resistance of Alloy 316H will be comparable to Alloy 316/316 L and will have superior corrosion resistance to Alloy 304/304L. Process environments that do not attack Alloy 304/304L will not attack this grade. One exception, however, is in highly oxidizing acids such as nitric acid where stainless steels containing molybdenum are less resistant. Alloy 316H performs well in sulfur containing service such as that encountered in the pulp and paper industry. The alloy can be used in high concentrations at temperatures up to 120°F (38°C).
Alloy 316H also has good resistance to pitting in phosphoric and acetic acids. It performs well in boiling 20% phosphoric acid. The alloy can also be used in food and pharmaceutical process industries where it is utilized to handle hot organic and fatty acids where product contamination is a concern.
Alloy 316H performs well in fresh water service even with high levels of chlorides. The alloy has excellent resistance to corrosion in marine environments under atmospheric conditions.
The higher molybdenum content of Alloy 316H assures it will have superior pitting resistance to Alloy 304/304L in applications involving chloride solutions particularly in oxidizing environments.
