1. Brief introduction
ASTM A249 TP316L(UNS S31603) is an ultra-low-carbon austenitic stainless steel welded tube.
Adding molybdenum (2.0-3.0%) significantly improves the resistance to chloride corrosion and
pitting corrosion. Its carbon content is ≤0.03%, effectively
avoiding the precipitation of carbides in the heat-affected zone of
welding and ensuring the welded joint's intergranular corrosion
resistance. It is widely used in pressure-bearing equipment in
high-temperature and corrosive environments.
2. Chemical composition of ASTM A249 TP316L tube (wt%)
| Element | Range |
|---|
| C | ≤0.030 |
| Cr | 16.0-18.0 |
| Ni | 10.0-14.0 |
| Mo | 2.00-3.00 |
| Mn | ≤2.00 |
| Si | ≤1.00 |
| P | ≤0.045 |
| S | ≤0.030 |
| Fe | margin |
3. Comparison of equivalent grades
- EN: 1.4404 / X2CrNiMo17-12-2
4. Mechanical properties (solution annealed state)
| Parameters | Numeric |
|---|
Tensile strength (Rm)
| ≥485 MPa |
Yield strength (Rp0.2)
| ≥170 MPa |
Elongation (50mm gauge length)
| ≥35% |
Hardness (HB)
| ≤217 |
5. Application areas of ASTM A249 TP316L Welded Stainless Steel
Tube
- Petrochemical energy: refinery heat exchanger tubes, LNG cryogenic pipelines.
- Pharmaceutical equipment: bioreactors, clean piping systems (ASME BPE standard).
- Marine engineering: desalination units, marine condensers.
- Food processing: pasteurization pipelines, fermentation tanks.
- Environmental protection equipment: flue gas desulfurization (FGD) systems, wastewater treatment heat
recovery units.
6. Additional Notes
- Testing standards: 100% eddy current testing (ASTM E426), water pressure/air pressure
test (optional).
- Surface treatment: pickling and passivation (ASTM A380), electrolytic polishing
(Ra≤0.5μm).
- Supply specifications: outer diameter 6-1200mm, wall thickness 0.5-25mm, support
customized U-shaped/coil.
