The main element in glass is silicon, and there are some alloys of steel with a small percentage of silicon added, but this isn't glass.
Steel is essentially iron and carbon alloyed with certain additional elements.
The process of alloying is used to change the chemical composition of steel and improve its properties over carbon steel or adjust them to meet the requirements of a particular application.
Benefits of Steel Alloying Agents:
Different alloying elements each have their own affect on the properties of steel. Some of the properties that can be improved through alloying include:
Stabilizing austenite: Elements such as nickel, manganese, cobalt and copper increase the temperatures range in which austenite exists.
Stabilizing ferrite: Chromium, tungsten, molybdenum, vanadium, aluminum and silicon can have the effect of lowering carbon's solubility in austenite. This results in an increase in the amount of carbides in the steel and decreases the temperature range in which austenite exists.
Carbide forming: Many minor metals, including chromium, tungsten, molybdenum, titanium, niobium, tantalum and zirconium, form strong carbides that - in steel - increase hardness and strength. Such steels are often used to make high speed steel and hot work tool steel.
By quenching molten metals rapidly before they can crystallize and develop the regular atomic arrays which characterize metals, you create a "Metallic glass", which has different physical properties than conventionally formed metals.
Amorphous metals have higher tensile yield strengths and higher elastic strain limits than polycrystalline metal alloys, but their ductilities and fatigue strengths are lower. Amorphous alloys have a variety of potentially useful properties. In particular, they tend to be stronger than crystalline alloys of similar chemical composition, and they can sustain larger reversible ("elastic") deformations than crystalline alloys. Amorphous metals derive their strength directly from their non-crystalline structure, which does not have any of the defects (such as dislocations) that limit the strength of crystalline alloys. One modern amorphous metal, known as Vitreloy, has a tensile strength that is almost twice that of high-grade titanium. However, metallic glasses at room temperature are not ductile and tend to fail suddenly when loaded in tension, which limits the material applicability in reliability-critical applications, as the impending failure is not evident. Therefore, there is considerable interest in producing metal matrix composites consisting of a metallic glass matrix containing dendritic particles or fibers of a ductile crystalline metal.