ATI - Model 18CrCb - Ferritic Stainless Steels
From Advanced Alloys and Solutions - Standard Stainless Sheet Products
ATI's AL 18CrCb™ stainless steel is a heat-resisting ferritic grade providing good oxidation and corrosion resistance for applications like automotive exhaust system components. Ferritic alloys are not inherently strong at elevated temperatures, but columbium additions coupled with appropriate solution annealing markedly improve long-time creep-rupture strength properties ATI 18CrCb™ alloy is dual stabilized with columbium and titanium to provide good weld ductility and resistance to intergranular corrosion in the weld heat affected zone. ATI 18CrCb™ alloy has been developed for the severe tube bending and forming operations typical in automotive exhaust manifold fabrication. Tight control on carbon and nitrogen levels plus improved mill processing result in enhanced formability in terms of higher tube bending speeds and lower breakage or scrap rate.
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Product Details
STRUCTURE
ATI 18CrCb™ stainless steel is a ferritic alloy, i.e., the matrix has a body-centered cubic (BCC) crystal structure. Angular carbonitrides of titanium and columbium are randomly dispersed throughout the structure.
Excess columbium is taken into solid solution during high temperature annealing and precipitates as very fine particles of Laves phase (Fe2Cb) upon either slow cooling or upon holding at intermediate temperatures (1500-1700°F, 816-927°C). Strengthening by this dispersion is responsible for improved elevated temperature strength.
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