Why aren’t carbon steel flanges and carbon steel elbows the same color?
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Why aren’t carbon steel flanges and carbon steel elbows the same color? The flanges made of carbon steel have a brighter appearance, without any rust spots, and their luster is similar to that of stainless steel. In contrast, the elbows made of carbon steel have a dull color and are covered in rust
Things that are flanged. A elbow is formed by bending a straight pipe after heating it.
Rust caused by smoothness and flatness. It looks different now, right?
Although it’s the same material, the processing techniques, methods, and storage conditions are different. The groove at the end of a carbon steel pipe is also quite shiny right after it’s made, isn’t it?
Flanges are machined, and oil is usually applied to them after machining to prevent rusting.
One comes out of a cold car, and the other has strong heating for bending