316H Stainless Steel Plate – High-Strength, Corrosion-Resistant Alloy

Alloy 316H (UNS S31609) is a high-carbon variant of the standard 316 stainless steel, designed for enhanced strength at elevated temperatures. The increased carbon content (0.04–0.10%) provides greater tensile and yield strength, making it suitable for high-temperature applications.

 

Corrosion Resistance

In most instances the corrosion resistance of Alloy 316H will be comparable to Alloy 316/316L 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.

 

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