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不鏽鋼鑄造中材質疏松的原因及解決方法

   不鏽鋼鑄造無論是扁錠還是園錠在生産中經常會出現氣孔和疏松缺陷問題,氣孔和疏松如同孿生姐妹,常常相伴爲生,給鋁加工帶來許多麻煩。不鏽鋼鑄造组织中存在圆形孔洞称为气孔。它是金属液体在冷却期间和凝固过程中,析出的气体存留在铸锭中形成的气泡缺陷。疏松是在不鏽鋼鑄造组织在凝固的过程中,由于不锈钢在液态和凝固态的过程中,体积在收缩得不到很好的补充而产生出分散孔洞。气孔形成的主要因素:在溶解中的熔体的气体处于饱和状态,溶体中存在大量非金属夹渣物,气体在铸造的过程中上浮速度慢,则气泡就会停留在铸锭中产生气孔。 

Stainless steel casting slab ingot or garden ingot in production often appear porosity defect and loose, porosity and loose like twin sisters, often accompanied by a living, bring a lot of trouble to aluminum processing. Stainless steel casting organization exists in the circular holes called pores. It is during the cooling and solidification process of liquid metal, the separation of gas remaining in the ingot casting defect formation of bubbles. Osteoporosis is in stainless steel casting organization in the process of solidification, as a result of stainless steel in liquid and solid in the process of coagulation, shrinking volume is not very good supplement and produce scattered holes. Porosity formation: the main factors in the gases dissolved in the melt in saturated state, the solution of a large number of non-metallic slag content, gas in the process of casting to rise slowly, the bubbles will remain the appearance of porosity in ingot casting.

          在分析疏松的原因有几种情况: 

1.熔體過熱。2.熔體中氣體含量過高。3鑄造溫度過低。4.泠卻強度小.鑄造速度過快。5.漏鬥供流不均勻。6.烘爐不徹底.停爐時間過長。7.工具及精煉氣體.溶劑等潮濕或不徹底。8.高鎂合金覆蓋不好。 

不鏽鋼鑄造气孔及疏松是最为常见的缺陷之一,不锈钢熔炼与铸造技术(工艺规程)产生;都是围绕气孔和疏松缺陷所制定出来的。如何解决气孔和疏松缺陷问题? 

      采取几项措施: 

1.是控制化學成分雜質含量(減少非金屬夾雜物)2.是固體料投放改爲液體料投放(縮短熔煉時間)3.是加強精煉除氣4.是將原來小園錠規格改爲大園錠(以降低鑄造速度,改變過度帶尺寸)結果避免損失。 

氣孔的産生原因: 

1.熔爐大修或者中修.長期停爐後幹燥不徹底。2.原材料潮濕.有油汙.水份。3.潤滑油質量不好。4.熔體在爐中過熱。5.工具末徹底幹燥。6.燃氣水分過大。7.熔煉的時間過長。 

    疏松一般分为两种:一种是收缩间产生的疏松,一种是末去除溶体气体形成的疏松。疏松的形成主要因素与熔体的气体含量与铸锭成形时过度带的尺寸.形状以及结构有关。 

從上述案例看,雖然事件已過去整整三十多年,但是對于我們鋁加工探索與發展提供了非常寶貴的數據和借鑒。 

小結: 

  1. 加強成分雜質的控制,有效減少非金屬夾渣物的增多。

  2. .采用液體供料,縮小了金屬在溶爐停留時間,使溶爐內的氣體在不飽和的作用下得到釋放和分解。

  3. 不鏽鋼鑄造温度采用上限。

  4. 降低鑄造速度改變液穴過渡帶結構,讓剩余的氣體有足夠的上浮空間。

  5. 行之有效的除氣精煉。

  6. 熔鑄工藝技術的制定不是一成不變,在特殊的情況下,果斷采用預案,以防日本变态强奷在线播放質量缺陷的發生。


 1. Strengthen the composition control of impurity, reduce non-metallic slag content increasing. 

2. The liquid feeding, reduce the time spent in metal bath furnace, make the gas inside the bath furnace under the action of unsaturated release and decomposition.

 3. Adopt stainless steel casting temperature limit. 

4. Reduce the casting speed changing fluid hole transition zone structure, make the rest of the gas enough to rise space. 

5. Effective degassing refining.

 6. Set of electroslag casting technology is not a constant, in special cases, the decisive adopts the plan, to prevent the occurrence of product quality defects.

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