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本产品选用优质的精密钢管原材料，经过特殊的加工工艺，严格按照GB/T3639-2000国家精密无缝钢管标准生产而成。具有精密度高，内外表面粗糙度好，光洁度高等特点。
This type of precision steel tube made by high quality pricise
steel, through special processing, issued by BG/T3639-2000
Standard. Have high precision, fine in-out surface, and high
glaze ect.
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