What are stainless steel boiler tubes?

Stainless steel boilers tubes are high-strength modules designed to operate at high pressures and temperatures. Boiler tubes are located inside boilers to heat water in order to produce steam. These versatile boiler grades are available in water or fire tube grades.

stainless steel boiler tubes properties

What Causes Stainless Steel Boiler Exhaust Pipe Leaks?

Boiler exhaust pipes are put through vigorous pressure and temperatures. The pipes in these grades leak or can be damaged due to corrosive media to the module or the entire system. Improper treatment of the piping module after installation is another cause for pipe leaks across stress-induced environments. The pipe exhaust systems may also fail due to thermal shock caused because of the introduction of foreign material like cold water in the system. Apart from this, the strong exhaust pipes may also leak due to the formation of scales on the boiler pipe leading to the destruction of the boiler-grade exhaust pipes.

Benefits of water tube boiler over fire tube boiler

In comparison to stainless steel fire tube boiler, which is the other kind of boiler type, stainless steel boiler pipe has far more advantages.

  • Steam forms from liquid more rapidly.
    The source of heat surrounds the liquid as it moves through the pipe, instead of the other manner around.
  • Boilers with water tubes consume less water.
    Water tube boilers are more eco-friendly by structure because they don’t require so much amount of water storage to generate heat because they raise the temperature in the tube just once.
  • Heaters with water tubes can adjust to changing pressures more readily.
    ss water tube boiler can react to fluctuations in the need for vapor faster by heating very little water at once.

How To Choose Good Quality Stainless Steel Boiler Tubing

SS boiler tubing can be purchased by observing certain features. Here are the best choices to select a quality tube.

  • Check the surface of the boiler tubing. A good boiler grade has a good smooth surface, so select the tubing accordingly.
  • A good boiler has good density and a lower percentage of impurities. A pipe with a lower density should be steered away from making a boiler tubing.
  • A SS boiler tube possesses a smooth cross-section and will be devoid of any bumps or irregularities.

Austenitic stainless steel heat exchanger tube, with good corrosion and oxidation resistance, but its use in the process will still appear brittle fracture situation, what is the reason?

  1. Brittleness

The so-called brittleness refers to the steel and other engineering components in the toughness, plasticity index value is low, brittle failure is often no signs, the harm is often catastrophic, just like the stainless steel heat exchanger tube, once the brittle fracture, it is easy to cause heat exchanger internal leakage, and even serious will also cause huge economic losses to the enterprise, so we should pay attention to its use in the daily use of stainless steel heat exchanger tube, try to avoid the brittle fracture of stainless steel heat exchanger tube.

2. Stainless steel heat exchanger tube brittle fracture, mostly caused by the stress corrosion of Cl- and H2S. To be more specific, it is.

(1) Stress is certain to have, the effective stress that produces stress corrosion is tensile stress, it is the superposition of engineering stress, residual stress and assembly stress, residual stress in the production process of stainless steel heat exchanger tube and assembly process will be generated, in many cases, only residual stress is sufficient to produce stress corrosion; stress corrosion also has to stress concentration source, stainless steel heat exchanger tube in the assembly and use process are likely to form micro-cracks, bruises, and scratches, these are stress corrosion stress concentration source.

(2) A very small amount of Cl- (Cl- the content of more than 25mg/L), it can make austenitic stainless steel heat exchanger tube stress corrosion, cracking, Cl- on austenitic stainless steel heat exchanger tube stress corrosion, the first is in the stress concentration site pitting corrosion, along the grain boundary or penetration of the crystal to the internal penetration, when penetration to a certain depth, under the action of tensile stress, brittle fracture; in addition, H2S on Austenitic stainless steel heat exchanger tube stress corrosion is more hazardous than seawater, the stress corrosion mechanism is generated at high temperatures FeS and the role of wet air to produce even more sulfuric acid, easy to make austenitic stainless steel welding heat affected zone intergranular stress corrosion fracture.

3. It is worth noting that the brittle fracture related to the stainless steel heat exchanger tube, may also be the heat treatment of stainless steel heat exchanger tube, especially in some cases, in a certain tempering temperature interval, toughness indicators with the tempering temperature change curve there is a trough, showing the phenomenon of brittleness; Therefore, Dong Yan company production of stainless steel heat exchanger tube using a reasonable selection of materials and strict heat treatment process, in order to inhibit and prevent the generation of tempering brittleness, so as to ensure the heat transfer work of stainless steel heat exchanger tube.

Are stainless steel heat exchangers better?

Being suitable with simple, fresh water and not requiring the application of system regulators, a heat exchanger pool stainless steel is extremely useful. This implies that a ss heat exchanger only needs occasional upkeep to maintain its good shape.Additionally, it is important to realize that the efficiency of stainless-steel changes with the quantity of chromium it possesses. This indicates that it will be a less efficient heat exchanger except if the stainless steel has good quality.Although stainless steel claims superior quality, aluminum may be more affordable to produce, making it a preferred option for many boiler firms.

What are the grades of ss boiler tubing?

The ASME Boiler tube provides two different sets of allowed pressures for austenitic stainless steels. This seems to be due to their very weak yield stress. At temperatures in which the short-term tension characteristics might limit application, greater permissible tensile stresses were established. The 18 chromium and 8 nickel alloy come in 304L, 304LN, 304H, & 304N forms. Each of them has high tensile strength and great oxidation and corrosion tolerance.To ensure better long-term high thermal characteristics, T304 has more carbon as well as a lower solvent heating rate.