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.
A blacksmith is a metalsmith who creates objects from wrought iron or steel by forging the metal, using tools to hammer, bend, and cut (cf. whitesmith). Steel is a mixture of Iron and between 0.3% to 1.7% Carbon by weight. 2  The presence of carbon allows steel to assume one of several different crystalline configurations. 3  Macroscopically, this is seen as the ability to turn the hardness of a piece of steel on and off through various processes of heat-treatment.