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.
Carbon steel: An alloy of iron and less than two percent carbon, carbon steel is a more modern invention, having developed alongside steel, stainless steel, and aluminum in the 18th and 19th centuries. It can be rolled, stamped, and forged into shape and is less brittle than cast iron. Construction.