Steel is a strong metal that can be used to give window frames a high level of security as well as a sleek modern design. Something worth noting is that not all steel windows are made entirely of steel. In many cases they actually have a timber core that's then coated in steel.
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One of the most interesting characteristics of stainless steel window frames is its resistance to high and low temperatures. This makes them particularly suitable for manufacturing, as they are at the same time resistant and workable.