SS ASME SA269 / ASTM A269 TP316L Seamless Tube Bright Annealing
What is A269 TP316L ?
ASTM A269 Tp316L is a grade of seamless and welded austenitic steel
with nominal wall thickness that is designed with 316 austenitic
stainless steel. The ASTM A269 TP316L Tube is composed of an
outstanding content of chromium, nickel, and molybdenum.
Characteristics
ASTM A269 tubing, made of grades TP304 and TP316 as well as their
low carbon version TP304L and TP316L, exhibits good corrosion
resistance in atmospheric industrial and marine environments as
well as some oxidizing chemical environments. Especially, TP316
& TP316L offer enhanced resistance to pitting corrosion in
chloride solution. The low carbon version TP304L or TP316L reduces
sensitization significantly and provides much better welding
performance. The tubing has outstanding impact toughness at low or
cryogenic temperatures. It maintains long life span at elevated
temperatures and under other severe conditions.
Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N |
| 316L | min. | – | – | – | – | – | 16.0 | 2.0-3.0 | 10.0 | – |
| max. | 0.035 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0 | 14.0 | – |
Mechanical Properties
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness |
| Rockwell B (HR B) max | Brinell (HB) max |
| 316L | 485 | 170 | 40 | 95 | 217 |
Physical Properties
| Grade | Density
(kg/m3) | Elastic Modulus
(GPa) | Mean Co-eff of Thermal Expansion (m/m/0C) | Thermal Conductivity
(W/m.K) | Specific Heat 0-1000C
(J/kg.K) | Elec Resistivity
(nΩ.m) |
| 0-1000C | 0-3150C | 0-5380C | At 1000C | At 5000C |
| 316/L/H | 8000 | 193 | 15.9 | 16.2 | 17.5 | 16.3 | 21.5 | 500 | 740 |
Grade Specification Comparison
| Grade | UNS
No | Old British | Euronorm | Swedish
SS | Japanese
JIS |
| BS | En | No | Name |
| 316 | S31600 | 316S31 | 58H, 58J | 1.4401 | X5CrNiMo17-12-2 | 2347 | SUS 316 |
| 316L | S31603 | 316S11 | - | 1.4404 | X2CrNiMo17-12-2 | 2348 | SUS 316L |
| 316H | S31609 | 316S51 | - | - | - | - | - |
Applications
The ASTM A269 tubing are widely used in instrumentation piping to
connect various piping, valves, instruments and apparatuses, or to
measuring equipment. They may be used for high purity gas piping,
fine chemical engineering, sampling & analysis system,
hydraulic line, chemical and petrochemical process control, coal
processing, as well as automotive engineering. Especially, grades
TP304, TP304L, TP316 and TP316L of ASTM A269 are listed and
endorsed by ASME B31.3 – process piping.
