石墨冷鐵特點說明
在鑄造時,常使用灰鑄鐵等金屬作為激冷材料,由於灰鑄鐵等金屬的導熱系數小(2.0--2.5千卡/米.小時.度),常造成鑄件的外部已經凝固瞭,內部還呈液體狀態。等一會雖然內部冷卻凝固下來,但由於內部在冷卻凝固時體積的縮小,常造成表麵凹陷和內裂質地疏松的缺陷。
一、石墨冷鐵的優點:
1、能使鑄件內外部盡快的同時冷卻。由於石墨冷鐵的導熱系數大,短時間內吸熱就多。使鑄件內外部盡快的同時冷卻,不但解決瞭鑄件熱節部位的質地疏松、縮孔問題,還使鑄件金相組織為細片狀珠光體達95%以上,共晶團數可達450—550cm,鑄件硬度可提高20—50HB,提高瞭鑄件表麵的光潔度和耐磨性。2、石墨冷鐵易操作。由於石墨冷鐵的比重小,約為金屬冷鐵的1/5左右,搬運時輕便,砂型(芯)翻箱時不易掉落。3、石墨冷鐵可重復使用,成本低。由於石墨冷鐵的耐火度高達2800攝氏度,能耐高溫,有不易氧化的性能。不但避免瞭鑄件產生白口(滲碳體)和氣孔等鑄造缺陷。其冷鐵材料的表麵還不易燙壞、氧化、龜裂,使用壽命比鑄鐵等金屬材料冷鐵長5——10倍。
二、石墨冷鐵材料的使用方法:
在鑄件需要激冷的熱節部位安放成形的石墨冷鐵造型(芯),其厚度為鑄件熱節部位園直徑的0.6--1倍。如果用於鑄鐵件應在冷鐵上塗刷石墨塗料,鑄銅件可在冷鐵上塗刷石墨塗料或滑石粉塗料,以防鑄件增碳並隨型(芯)烘乾,效果更佳。我司特殊加工制成的石墨冷鐵材料固定碳>99%;具有比重輕(比重1.6-1.9克/立方厘米);耐火度高(耐火度2800度);導熱系數大(21千卡/米.小時.度)等優點。因此用我廠生產的石墨冷鐵作激冷材料代替金屬材料冷鐵,能較好地解決鑄鋼、鑄鐵、鑄銅、鑄鋁等鑄件的疏松、縮孔問題。並能有效地解決鑄件因使用金屬冷鐵產生的白口、氣孔等鑄造缺陷。能使鑄件金相組織為細片狀珠光體達95%以上,共晶團數可達450—550cm,鑄件硬度可提高20—50HB,提高瞭鑄件表麵的光潔度和耐磨性。
三、石墨冷鐵註意事項:
1、請勿用尖銳物體用力敲打2、禁止雨淋濺水
2、最好在使用時先進行烘乾處理。
¥100.00
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¥12.00
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¥600.00
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¥3.50
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¥25.00
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¥58.00
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¥20.00
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