1 Not all adenomas produce excess T-4, and doctors aren't sure what causes some to begin producing too much hormone. 2  Thyroiditis. 3  Sometimes your thyroid gland can become inflamed for unknown reasons. 4  The inflammation can cause excess thyroid hormone stored in the gland to leak into your bloodstream.
Forged steel is an alloy of carbon and iron that is compressed under extreme pressure to make a very hard and strong substance. It has been used for thousands of years to create all types of materials.
In metalworking and jewellery making, casting is a process in which a liquid metal is somehow delivered into a mold that contains a hollow cavity (i.e., a 3-dimensional negative image) of the intended shape. The metal and mold are then cooled, and the metal part (the casting) is extracted.