The primary focus of the specification is the chemical makeup of the steel. Carbon steel is an alloy primarily of iron and carbon, but the presence of other elements—such as manganese, phosphorus, sulfur, and silicon—must be strictly controlled.
He knelt on the steel catwalk of the aging North Sea rig, the wind whipping salt spray against his goggles. Below him, the massive welds of the main support pylon were hidden under layers of marine paint and decades of stress. If there was a crack, it was invisible. If it stayed invisible, the rig wouldn't survive the winter gales. bs 2704 pdf
BS 2704, titled "Specification for calibration blocks for use in ultrasonic flaw detection," is a cornerstone British Standard detailing the requirements for steel blocks used to calibrate ultrasonic equipment. The primary focus of the specification is the