ASTM A312 TP316 and TP316L are designated with UNS S31600 and UNS
S31603, respectively. Although more expensive, pipes made of TP316/
TP316L have higher level corrosion resistance than that of TP304/
TP304L. They can be used for a diversified range of corrosive
chemical process piping which involves inks, rayon, photographic
chemicals, paper, textiles, bleaches, and rubber.
Manufacture & Heat Treatment
Seamless pipes made of ASTM A312 TP316/ TP316L shall be made by a
process that does not involve welding at any stage of production;
welded pipes shall be manufactured using an automatic welding
process with no addition of filler metal during the welding
process. The TP316/ TP316L pipe shall be heat treated by solution
treatment, in which the pipe shall be heated and held for long
enough period at a temperature no less than 1900°F [1040°C] so that
all chromium carbides can be fully austenitized/ dissolved.
Subsequent water cooling or rapid cooling by other means shall be
conducted to ensure no precipitation of carbides at grain
boundaries. Moreover, TP316L is less likely to precipitate chromium
carbides compared to TP316 since their carbon content is low enough
to reduce precipitation of intergranular carbides. This may result
in limited sensitization hence benefit welding, flame cutting, and
other hot-working operations.
Chemical Composition Requirements
| Element | Composition, %
TP316 | Composition, %
TP316L |
|---|
| C | ≤0.08 | ≤0.035 |
| Mn | ≤2.00 | ≤2.00 |
| P | ≤0.045 | ≤0.045 |
| S | ≤0.030 | ≤0.030 |
| Si | ≤1.00 | ≤1.00 |
| Cr | 16.0-18.0 | 16.0-18.0 |
| Ni | 10.0-14.0 | 10.0-14.0 |
| Mo | 2.00-3.00 | 2.00-3.00 |
*Based on product analysis.Mechanical Properties
| Tensile Requirements | TP316 | TP316L |
|---|
Tensile Strength
min. MPa [ksi] | 515
[75] | 485
[70] |
Yield Strength
min. MPa [ksi] | 205
[30] | 170
[25] |
Elongation in
2", min, % (*L) | 35 | 35 |
Elongation in
2", min, %(*T) | 25 | 25 |
*L: longitudinal elongation; *T: transverse elongation.Sizes, Dimensions & Tolerances
| NPS | *t/D | Tolerance, % from Nominal |
|---|
| 1/8"~2.5" | All | +20.0 | -12.5 |
| 3"~18" | ≤5% | +22.5 | -12.5 |
| 3"~18" | >5% | +15.0 | -12.5 |
≥20“
Wld. | All | +17.5 | -12.5 |
≥20“
smls | ≤5% | +22.5 | -12.5 |
≥20“
smls | >5% | +15.0 | -12.5 |
*t: nominal wall thickness; D: ordered outside diameter.ASTM A312 TP316/ TP316L seamless pipes are generally furnished in
sizes 1/2″ through 24″, while ASTM A312 TP316/ TP316L welded pipes
are available from 1-1/2″ through 48″. The wall thicknesses shall
be furnished in accordance with ASME B36.10M or ASME B36.19M. The
pipes are usually supplied in lengths of 6.096 m (20′), 12.19 m
(40′), 6 m, and 12 m, etc. No pipe shall be under the specified
length and no pipe shall be more than 0.25″ [6 mm] over the
specified length.
Inspection & Tests
Visual examination, dimensional inspection, PMI chemical analysis,
tensile test, flattening test, bend test, eddy-current test,
etching test, radiographic examination (for welded pipes),
intergranular corrosion test (upon request).
