In case of any split-off, sinkhead or serious bending found on a rebar in cutting, it should be cut away. If the hardness of a certain rebar is found quite different from what it should be, the worker shall immediately report to the responsible engineer.

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It was found the flow velocity gradients around the gas-tunnel was high enough to cause air mixture and sand-core washing-out, the casting should be with good sinkhead and gas-venting ability.

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It has been found that its formation is caused by shrinkage cavity descending below thermal insulating sinkhead of ingot mould and silicate inclusion separating the metal of rail web.

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sinkhead：凹陷鑄疵

凹口作用notcheffect | 凹陷鑄疵sinkhead | 巴氏合金B(yǎng)abbittmetal