Elbows are used to change the direction of the pipeline. Commonly used elbow bending angle of 90°, 45° and 180°. 180° elbow is also known as the U-shaped elbow, there are also special angles of the elbow, but the number is very small.

1. National standard marking:Flanges shall be marked according to nominal diameter, nominal pressure, sealing surface form code, mating steel pipe series code (mating metric pipe code is "series 2", mating inch pipe is not marked) and standard number. Marking example: Nominal diameter 80mm, nominal

The global steel industry is undergoing a major transformation: Italian steel company ADI temporarily shut down its No. 2 blast furnace; Morocco ended safeguard measures on steel imports; Latin America may adopt measures similar to the EU's carbon border adjustment mechanism to balance steel trade; and UAE Steel Company promoted a green hydrogen emission reduction project, aiming to replace natural gas with renewable energy hydrogen in the ironmaking process by early 2024.

Time flies and it's the end of the year. 5 countries have national days in December and many countries celebrate Christmas in December. Does your country celebrate Christmas? Join me to learn about the origin of Father Christmas and Christmas customs in some countries.Origin of Father ChristmasFathe