Alloy 316/316L Stainless Steel

Alloy 316/316L Stainless Steel

Alloy 316/316L Stainless Steel General Properties Alloy 316/316L (UNS S31600/S31603) is a chromium-nickelmolybdenum austenitic stainless steel developed to provide improved corrosion resistance to Alloy 304/304L in moderately corrosive environments. It is often utilized in process streams...
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Alloy 316/316L Stainless Steel

General Properties

Alloy 316/316L (UNS S31600/S31603) is a chromium-nickelmolybdenum austenitic stainless steel developed to provide improved corrosion resistance to Alloy 304/304L in moderately corrosive environments. It is often utilized in process streams containing chlorides or halides. The addition of molybdenum improves general corrosion and chloride pitting resistance. It also provides higher creep, stress-to-rupture and tensile strength at elevated temperatures.


It is common practice for 316L to be dual certified as 316 and 316L. The low carbon chemistry of 316L combined with an addition of nitrogen enables 316L to meet the mechanical properties of 316.


Alloy 316/316L resists atmospheric corrosion, as well as, moderately oxidizing and reducing environments. It also resists corrosion in polluted marine atmospheres. The alloy has excellent resistance to intergranular corrosion in the as-welded condition. Alloy 316/316L has excellent strength and toughness at cryogenic temperatures.


Alloy 316/316L is non-magnetic in the annealed condition, but can become slightly magnetic as a result of cold working or welding. It can be easily welded and processed by standard shop fabrication practices.


Chemical Analysis

Weight % (all values are maximum unless a range is otherwise indicated)

Element316316L
Chromium16.0 min.-18.0 max.16.0 min.-18.0 max.
Nickel10.0 min.-14.0 max.10.0 min.-14.0 max.
Molybdenum2.00 min.-3.00 max.2.00 min.-3.00 max.
Carbon0.080.030
Manganese2.002.00
Phosphorus0.0450.045
Sulfer0.030.03
Silicon0.750.75
Nitrogen0.10.1
IronBalanceBalance


Lowest Temperature (°F) at Which the Corrosion Rate Exceeds 5mpy

CORROSION
ENVIRONMENT
Type
316L
Type
304
2205
(UNS S32205)
2507
0.2% Hydrochloric Acid>Boiling>Boiling>Boiling>Boiling
1% Hydrochloric Acid8686p185>Boiling
10% Sulfuric Acid122140167
60% Sulfuric Acid<54<59<57
96% Sulfuric Acid1137786
85% Phosphoric Acid203176194203
10% Nitric Acid>Boiling>Boiling>Boiling>Boiling
65% Niitric Acid212212221230
80% Acetic Acid>Boiling212p>Boiling>Boiling
50% Formic Acid104≤50194194
50% Sodium Hydroxide194185194230

83% Phosphoric Acid +
2% Hydrofluoric Acid

149113122140
60% Nitric Acid +
2% Hydrocloric Acid
>140>140>140>140
50% Acetic Acid +
50% Acetic Anhydride
248>Boiling212230
1% Hydrochloric Acid +
0.3% Ferric Chloride
77p68p113ps203ps
10% Sulfuric Acid +
2000ppm Cl- + N2
7795122
10% Sulfuric Acid +
2000ppm Cl- + SO2
<<59p<59104
WPA1, High Cl- Content≤50<<50113203
WPA2, High F- Content≤50<<50140167

ps = pitting can occur
ps = pitting/crevice corrosion can occur


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