A249 specification covers nominal-wall-thickness welded tubes and heavily cold worked welded tubes made from austenitic steels, with various grades intended for use as boiler, superheater, heat exchanger, or condenser tubes.
Typical Chemical Properties
|
304 |
304L |
316 |
316L "Carbon |
max |
%" |
0.08 |
0.030 |
0.08 |
0.030 "Manganese |
Max |
%" |
2.00 |
2.00 |
2.00 |
2.00 "Phosphorous |
Max |
%" |
0.045 |
0.045 |
0.045 |
0.045 "Sulfur |
Max |
%" |
0.03 |
0.03 |
0.03 |
0.03 "Silicon |
Max |
%" |
1.00 |
1.00 |
1.00 |
1.00 "Chromium |
%" |
18.0 – 20.0 |
18.0 – 20.0 |
16.0 – 18.0 |
16.0 – 18.0 "Nickel |
%" |
8.0 – 11.0 |
8.0 – 12.0 |
10.0 – 14.0 |
10.0 – 14.0 "Molybdenum |
%" |
0 |
0 |
2.00 – 3.00 |
2.00 – 3.00 |
|---|
Typical Mechanical Properties
|
304 |
304L |
316 |
316L Tensile Strength Minimum ksi (MPa) |
75 (515) |
70 (485) |
75 (515) |
70 (485) Yield Strength Minimum ksi (MPa) |
30 (205) |
25 (170) |
30 (205) |
25 (170) Elongation Min |
35% |
35 |
35% |
35 "Rockwell Hardness Number |
maximum" |
B90 |
B90 |
B90 |
B90 |
|---|
Typical Permissible Variations in Wall Thickness
| All wall thickness' |
+20% / 0% |
Typical Permissible Variations in Outside Diameter
| Outside Diameters Under 1.000" |
+0.004" / -0.004" "Outside Diameters 1.000"" – 1.500"" inclusive" |
+0.006" / -0.006" "Outside Diameters 1.501"" – 2.000""" |
+0.008" / -0.008" "Outside Diameters 2.001"" – 2.500""" |
+0.010" / -0.010" "Outside Diameters 2.501"" – 2.999""" |
+0.012" / -0.012" "Outside Diameters 3.000"" – 4.000""" |
+0.015" / -0.015" |
Information provided is “Typical” for specific requirements please inquire.
