The flakes that may fall off during forging mainly fall into the following two categories:
Surface defects of raw materials
Oxide scale
During the high-temperature forging process, the oxide layer formed on the surface of steel will flake off due to high-temperature oxidation. This oxide layer, primarily composed of oxides such as Fe₃O₄ and Fe₂O₃, is brittle and hard, easily flakes off during machining or heat treatment.
Scab
During pouring, molten steel splashes and condenses on the surface of the ingot, which is compressed into scab after rolling. If not cleaned during forging, it may flake off and form pits.
Internal defects in forgings
Non-metallic inclusions
Inclusions formed by the loss of refractory material or the incorporation of sand during smelting may be elongated or broken up during forging, but typically exist in lumps.
Bright streaks (element segregation bands)
Bright streaks in titanium alloy or high-temperature alloy forgings are caused by localized segregation of alloying elements and may be distributed along flow lines. Note: The aforementioned flaky debris is often related to raw material quality or the forging process, and must be controlled during production through enhanced raw material inspection and optimized process parameters.
Of course, the above is a common and normal occurrence during the forging process. During the forging process, the forge will continuously make corrections to ensure the integrity and flawlessness of the final product. If you have large-volume forging needs, consider partnering with Mulan Metal. With 12 years of forging experience, we have helped clients in over 30 countries complete their forging operations and have received consistent recognition. We look forward to hearing from you.
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