Outokumpu 1.4509
Type X2CrTiNb18 stainless steel: EN 1.4509, UNS S43940, "AISI 441"
- Stabilized both with titanium and niobium (columbium)
Applications
- Tubular products for automotive industry and for process equipment like heat exchangers are the main application areas.
- This material is used also in architectural applications, like elevators and door frames. Additionally, various structures in catering and household are among the application areas.
- High chromium content makes this grade well suited for some selected applications for replacing standard austenitic grades.
Welding
- Conventional welding methods and filler materials applied to austenitic 300-series can be used. Heat input in welding should been kept in a minimum level.
- Generally welded structures show lower ductility compared to that of base material.
Forming and machining
- Grade 1.4509 can be formed using typical forming processes like folding, bending, drawing, etc.
- It has slightly higher proof strength than standard austenitic stainless steel grade 1.4301 / AISI 304 in combination with lower work hardening.
- Due to the titanium stabilization, its r-value is higher compared to non-stabilized ferritic stainless steel.
- These characteristics means excellent deep-drawability.
Corrosion resistance
- Outokumpu produces grade 1.4509 typically with a chromium content of about 18 wt-%.
- Titanium and niobium alloying reduces sensitivity for intergranular corrosion.
- Relatively high chromium content improves resistance to crevice corrosion that is better when compared to some other ferritic stainless steels, like 1.4016.
- Oxidation resistance is good up to 950°C.
- In chloride containing environments pitting and crevice corrosion is possible depending on various parameters like chloride concentration, temperature, pH value, redox potential, crevice geometry and others.
- The best material performance is reached usually with the help of adequate design, correct post-weld treatment and regular cleaning during use (if applicable).
Allgemeine Eigenschaften
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Technical Datasheet (English)
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