Porcelain enamel belongs to the inorganic nonmetallic material, it is one kind of compound materials, which was coated on the metal surface and burned under high temperature.
搪瓷材料属于无机非金属材料，它是一种深覆在金属表面的一层或多层玻璃质釉，在高温下烧制而成的金属与无机氧化物牢固结合的复合材料。
The results showed that the major cause of longitudinal surface cracking of 20 steel tube blanks was higher nonmetallic inclusion content in the steel than standard value.
结果表明： 非金属夹杂物超标是导致管坯表面产生纵向裂纹的主要原因。
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