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.
Steel is a highly versatile alloy, meaning a form of it can be made to meet almost any specifications. Steel has been in use for millenniums but became a more exact science during the Renaissance (1300-1700). An alloy is a metal made by combining two or more metallic elements.