If you're looking for a steel door track, then you have several options to choose between. Steel door tracks are available in a range of sizes and styles. You can find steel door track kits, steel entrance door tracks as well as steel entry door tracks among other products. A reliable steel door can really improve security. There are many different types of steel doors available such as steel glass doors, steel sliding doors, stainless steel doors as well as steel front doors, so you won't have a trouble finding one that suits your needs. 
Stanley Sliding Door Bypass 60" Steel Track Hardware Kit Model 40-3150
"Stanley Steel 60" Sliding Door / Bypass Track Kit Stanley Hardware Model # 40-3150 2 DOOR - DIAL ADJUST Boxed OpeningFeet 5 Unit: each Unit Weight:" 
CRL Steel Track for K180 Series Top Hung Track Sliding Door System - 157in (4m) Long
"CRL K180 Series Top Hung Single Steel Track can accommodate either 3/8 or 1/2 inch (10 or 12 millimeter) thick tempered glass panels weighing up to 396 pounds (180 kilograms). It is manufactured with a rust-proof "Neocrom" finish and can be attached directly to the ceiling or wall using brackets. The only fabrication needed for the glass is polishing the edges." These tracks can be found at amazon.com
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