Cold-Drawn Seamless Pipe Specifications
The method for making cold-drawn seamless pipes involves taking a round “billet” or bar of steel and boring it in the center, turning it, cutting it, heating it to make it more pliable, then “drawing” it (extruding or pulling it) to make it a longer and thinner tube. As the tube cools, “cold working” begins. Cold working involves pulling the tube over a stationary die and a mandrel. This increases the pipe’s hardness and improves its surface condition and grain structure while reducing the pipe to the desired size and thickness, according to Michigan Seamless Tube. ASTM Pipe Standards Formerly known as the American Society for Testing and Materials, ASTM International — with more than 30,000 technical experts from 135 countries — works voluntarily to provide standards for a wide range of products, materials, systems and services for the global manufacturing and trade industries. ASTM set standards for cold-drawn seamless pipe specifications to e...