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.
| |
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 |
| |
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 |
| All wall thickness’ |
+20% / 0% |
| 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.
