TP304N seamless stainless steel pipe for heat exchanger

TP304N stainless steel pipe is austenitic stainless steel. The high chromium and nickel content forms a dense chromium oxide film, which can resist corrosion from most organic acids, inorganic acids and salt solutions. Nitrogen further enhances high-temperature oxidation resistance and pitting resistance in chloride ion environments. The applicable temperature range is -196℃~870℃. The mechanical properties are stable below 400℃, which is suitable for high-temperature medium treatment in heat exchangers.

TP304N seamless stainless steel pipe Chemical composition

What is the difference between TP304N and TP304, TP316L, TP304LN stainless steel heat exchanger tubes?
Difference from TP304:
TP304N has higher strength and better high temperature corrosion resistance due to the addition of nitrogen, while the Cr content of ordinary TP304 is slightly lower (17-19%), and the price is relatively low.
Compared with 316L:
316L has stronger pitting resistance due to molybdenum (Mo), but the cost is high; TP304N is more cost-effective in an environment without high chloride ions.

Compared with TP304LN:
TP304LN is a low-carbon version (C≤0.035%), which further reduces the risk of welding sensitization and is suitable for long-term high-temperature service, but the strength is slightly lower than TP304N