HCCM水平連鑄黃銅管坯表面點(diǎn)狀缺陷的形成機(jī)理與控制

HCCM水平連鑄黃銅管坯表面點(diǎn)狀缺陷的形成機(jī)理與控制Formation mechanism and control of spot defect on surface of brass tube fabricated by HCCM horizontal continuous casting

研究熱冷組合鑄型(HCCM)水平連鑄H62 (UNS C27400)黃銅管坯外表面點(diǎn)狀缺陷的特點(diǎn)和形成機(jī)理，提出消除點(diǎn)狀缺陷的措施。結(jié)果表明：管坯外表面點(diǎn)狀缺陷主要為富鋅低熔點(diǎn)物質(zhì)，其鋅含量達(dá)80%(質(zhì)量分?jǐn)?shù))；點(diǎn)狀缺陷的出現(xiàn)沿連鑄方向呈周期性特征，管坯上部的點(diǎn)狀缺陷數(shù)量明顯多于下部的；連鑄過程中，揮發(fā)的鋅在冷型內(nèi)表面形成的鋅液滴與管坯外表面接觸后發(fā)生熔蝕反應(yīng)，使管坯外表面形成富鋅的點(diǎn)狀缺陷；通過快速降低冷型段內(nèi)管坯溫度，減少鋅元素?fù)]發(fā)及石墨鑄型內(nèi)表面鋅液滴的形成，可有效消除點(diǎn)狀缺陷。

The characteristic and formation mechanism of spot defect on the outer surface of H62 (UNS C27400) brass tube fabricated by HCCM horizontal continuous casting were studied, and an effective method for eliminating the defect was proposed. The results show that the spot defect on the tube outer surface is main zinc-rich low-melting-point substance, whose zinc content (mass fraction) reaches 80%. The spot defects are periodically formed along the casting direction and the number of the defects on the upper part of the tube is much more than that on the lower part. During casting, the volatilized zinc attaches to the graphite mold inner surface and forms zinc droplets which causes an erosion effect on the tube surface when the zinc droplets contact with the tube, leading to the formation of the zinc-rich spot defect on the tube surface. A method of rapidly lowering the temperature of the solidified tube in the cold mold, which can reduce the zinc volatilization and the number of the zinc droplets on the inner surface of the mold, is proposed to eliminate the spot defects effectively.

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