以下为句子列表：
英文: The quality of furan sand castings is usually better than clay sand castings, however, some defects are also very easy take place with furan sand castings such as blow hole, metal penetration, veining, cracking, slag inclusion, hardness too low, surface r
中文: 摘要呋喃树脂砂铸件质量一般比黏土砂铸件好，但如果原材料选择、工艺设计、造型和制芯操作不当，也会产生气孔、粘砂、脉纹、裂纹，夹渣、硬度不足、渗碳、渗硫和球化不良等铸造缺陷。
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