Carbon steel, composed simply of iron and carbon, accounts for 90% of steel production. Low alloy steel is alloyed with other elements, usually molybdenum, manganese, chromium, or nickel, in amounts of up to 10% by weight to improve the hardenability of thick sections. High strength low alloy steel.
The body mass index, or BMI, is a calculation used to determine your level of body fat. It can help a doctor determine your overall fitness and your risk of developing chronic diseases. Still, BMI is not the only factor your doctor considers, and it isnât a completely reliable assessment for every body type.
Muscle weighs more than fat, so a muscular person may appear to have a higher BMI, or a frail, inactive person may have more body fat than is healthy. For adults 20 years and older: 1  A BMI below 18.5 (shown in white) is considered underweight. 2  A BMI of 18.5 to 24.9 (green) is considered healthy. 3  A BMI of 25 to 29.9 (yellow) is considered overweight. 4  A BMI of 30 or higher (red) is considered obese.