Austenitic chromium-nickel stainless steel containing molybdenum to increase general corrosion resistance, resistance to pitting and strength at elevated temperatures.
Properties similar to Type 304 except that Type 316 is somewhat stronger at elevated temperature, and has better corrosion resistance
Type 316L
Extra low carbon version of Type 316 that eliminates harmful carbide precipitation due to welding
Specifications
The following specifications are generally applicable:
Sheets and Plates
MIL-S-5059
ASTM A 167
ASTM A 240
QQ-S-766
Bars and Angles
MIL-S-7720
AMS 5648
QQ-S-763
ASTM A 276
ASTM A 479
Composition
Property
Type 316%
Type 316L%
Carbon
.08 max
.03 max
Manganese
2.00 max
2.00 max
Phosporus
.045 max
.045 max
Sulfur
.030 max
.030 max
Silicon
1.00 max
1.00 max
Chromium
16.0-18.0
16.0-18.0
Nickel
10.0-14.0
10.0-14.0
Molybdenum
2.0-3.0
2.0-3.0
Mechanical Properties
Property
Type 316 Annealed
Type 316 L %
Ultimate tensile strength, psi
85,000
75,000
.2% Yield strength, psi
35,000
30,000
Elongation, % in 2"
50-60
50-55
Reduction of area, %
70
65
Rockwell hardness
B80
B75
Endurance Limit, psi
38,000
NA
Izod Impact, ft-lbs
95-120
NA
Typical Applications
Widely used in a variety of applications requiring superior corrosion resistance or good elevated temperature strength
Applications include valve parts, pumps, tanks, evaporators and agitators, textile processing equipment and a wide variety of parts exposed to marine atmospheres
Type 316 L is used extensively for weldments where its immunity to carbide precipitation due to welding assures optimum corrosion resistance
Machinability
Type 316 is somewhat more difficult to machine than Type 304 because of its toughness. As large a tool as possible and great amounts of cutting fluid should be used. Heavy feeds at slow speeds will machine best.
Weldability
Type 316 and 316L have excellent weldability and are readily joined by all methods employed with stainless steel. Weldments of Type 316 may require annealing to restore maximum corrosion reisistance. Type 316L eliminates the necessity for annealing except where required for stress relief.
Formability
Types 316 and Type 316L can be readily drawn and formed.
Corrosion Resistance
Type 316 provides better corrosion resistance than Type 304. It has excellent resistance to pitting type corrosion such as encountered in sea coast environment. It also has good resistance to most chemicalsinvolved in the paper, textile and photographic industries.
Forgeability
Forging is done by heating to 2200-2300°F and forging. No forging should be done below 1700°F. Material should be cooled rapidly after forging and hot forming.
Heat Treatments
ANNEALING: Material is heated to 1950-2050° F, cooled rapidly in air or water quenched
