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淬火油槽和回火油槽底部常常沉积着大量的氧化皮和灰渣。这些氧化皮和灰渣含有許多油,扔掉很可惜。如果把它们装在布袋里,压上生铁
Quench tank and the bottom of the tempering tank often deposited a lot of oxide and ash. It is a pity that these scales and ash contain lots of oil and throw away. If you put them in a bag, put on the pig iron