铸造材料

产品粘砂

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现有一批壳体类产品内角落粘砂严重，现用小风镐清除效果不理想，浪费人力及死角难清除。
大家有什麽好的建议请不吝赐教！！！！！！！！！！
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HT200，珠光体基体，你们退火以后，铁素体基体，抗拉一般小于100.不知道你们退火什么意思？
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石英砂啊，面层是5号砂
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