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%)

3. Comparison of equivalent grades

• EN: 1.4404 / X2CrNiMo17-12-2

• UNS: S31603

• JIS: SUS 316L

• GB: 022Cr17Ni14Mo2

4. Mechanical properties (solution annealed state)

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.