Lips and Teeth Interdependent: How Beveling and Typing Define the Exceptional Lifeline of Alloy ElbowsIn the grand landscape of industrial civilization, alloy elbows, as the core turning components of high-parameter pipeline systems, have long transcended the simple role of geometric connection. When the medium is scalding steam, high-pressure hydrogen, corrosive acid, or ultra-low-temperature liquefied natural gas, ordinary carbon steel elbows are powerless. At this point, alloy elbows made of high-grade materials such as stainless steel, duplex steel, and nickel-based alloys become the "special forces" ensuring the safe operation of the system. However, for an alloy elbow to transform from a fine blank into a reliable industrial cornerstone, there are two seemingly basic yet crucial processes that, like the finishing touches on a dragon painting, determine its ultimate quality and fate - they are beveling and marking. These two processes, one concerning its "life of connection" and the other defining its "dignity of traceability", jointly constitute the ultimate guarantee of the alloy elbow's outstanding performance. I. The Underestimated Prologue: Why Beveling and Typing Are the Soul Marks of Alloy Elbows To the layman, a bevel is merely a slanted edge at the end of a pipe, and stamping is just a few blurry steel imprints.