1.4521

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Thanks to the molybdenum alloying and rather high 18 % chromium content, the grade has excellent corrosion properties. Corrosion resistance is comparable to the austenitic grade 4401 / 4404 in various applications. As a result of molybdenum alloying, strength values for 1.4521 are higher compared to grade 1.4509.

Stabilization is made using both titanium and niobium. As a result of niobium alloying, a fully stabilized microstructure can be achieved with lower titanium levels, which improves the surface properties. Elongation to fracture values up to 30% (A80) can be achieved.

These properties make grade 1.4521 an ideal material for heat exchangers, boilers and water heaters. This grade may also be used in pipes for tap water and in other applications within drinking-water environments. 1.4521 grade is, for example, approved for use of drinking water applications by German (DVGW) and Swiss (SVGW) authorities. Another application having similar requirements is in solar water heaters.

Corrosion resistance

Grade 1. 4521 is Molybdenum alloyed ferritc steel, and because of this, resistance to localized corrosion is close to grade 1.4404 / AISI 316 “acid-proof” austenitic. In chloride containing solutions pitting and crevice corrosion is possible, depending on various parameters like chloride concentration, temperature, pH value, redox potential, crevice geometry and others. Optimal material performance is usually achieved through efficient design, correct post-weld treatment and regular cleaning during use (if applicable).

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