A Comprehensive Guide to Selecting Carbon Steel Elbows: From Beginner to Expert, Helping You Avoid Common Pitfalls Perfectly In the piping system, a seemingly insignificant carbon steel elbow might turn out to be the " Achilles' heel " of the entire project. The pipeline system is like the vascular network of the human body, and carbon steel elbows are the crucial "joints" in this network. A qualified elbow can ensure the smooth flow of fluids and guarantee the safe operation of the system; while an unqualified elbow may become the fatal weakness of the entire project. In industrial pipeline engineering, accidents caused by incorrect selection of elbows or substandard quality are quite common: ranging from local leakage to system paralysis, and even leading to serious safety incidents. 01 Understanding the basic classification of carbon steel elbows The classification of carbon steel elbows is far more than just differing angles.