لوله بدون درز ASTM A335 P22
ASTM A335 P22 Seamless Pipe is also known as the 2 ¼ chrome pipes. The material is a carbon steel with added chromium, molybdenum and vanadium at some instances. The chromium content is responsible for the added high temperature strength in the ASME SA335 Grade P22 Alloy Steel Pipe SCH 40 and other schedules.