Stainless steel heat exchanger tube performance turns out to be determined by the elements

Chromium is one of the more widely used elements in the production of stainless steel heat exchanger tubes. Because chromium is stainless steel are contained in the element, when the chromium element reaches 12%, in the atmospheric environment or in the oxidizing medium chromium can spontaneously form a stable, transparent, very thin passivation film to prevent corrosion, basically will not rust, higher alloy content can be strengthened by the thin film and rapid self-repairing film to improve the resistance to corrosion, that is to say, if chromium is added to stainless steel heat exchanger tube production, it can Increase the mechanical properties and wear resistance of stainless steel heat exchanger tube, increase the hardening degree of steel and the deformation ability after quenching, enhance the hardness, elasticity, antimagnetism, anti-tension, corrosion resistance and heat resistance of steel.

Nickel is the element that stabilizes austenite. Nickel is stable in austenite at a temperature of 800℃-1000℃; below 800℃, both ferrite and martensite have a stable crystal structure. If nickel is added in the production of stainless steel heat exchanger tube, it can help the stainless steel heat exchanger tube to improve the toughness and ductility, make it easier to process, manufacture and welding, enhance its corrosion resistance, and help the smooth operation of the heat exchange work.

Molybdenum is also an element used in the production of stainless steel heat exchanger tubes. If you add molybdenum in the production of stainless steel heat exchanger tube, you can improve the strength of the passivation film on the surface of the stainless steel heat exchanger tube, enhance the local corrosion resistance of the stainless steel heat exchanger tube, there will be no pitting, crevice corrosion of these localized corrosion (especially in the case of halogenated salts or seawater with chloride ions, stainless steel heat exchanger tube, localized corrosion will be greatly reduced); at the same time, molybdenum can also increase the stainless steel heat exchanger tube for the Chloride stress corrosion fracture resistance.

Silicon, aluminum is also a stainless steel heat exchanger tube production may be used in the elements. If the stainless steel heat exchanger tube production in the addition of silicon, aluminum, stainless steel heat exchanger tube can improve the oxidation resistance, especially the addition of silicon, but also improve the casting strength of stainless steel heat exchanger tube, so that it is easier to cast.