冷拔無縫鋼管據有很（hěn）好的抗腐蝕性，冷（lěng）拔無縫鋼管的理化性能主要取決（jué）於鋼的化學成分，組織結構和鋼（gāng）的純淨度以及（jí）冷拔無（wú）縫鋼管的熱處理方式等，冷拔無縫鋼管常見的工藝性能壓扁、擴口、卷邊、彎（wān）曲、焊接等。冷拔無縫鋼管常見（jiàn）的缺陷問題有：
The physical and chemical properties of cold-drawn seamless steel pipe mainly depend on the chemical composition of the steel, the structure and purity of the steel, and the heat treatment method of the cold-drawn seamless steel pipe. The common technological properties of cold-drawn seamless steel pipe are flattening, flanging, bending and welding. Common defects of cold-drawn seamless steel tubes are as follows: a. 危險性缺陷：裂紋、內折、外折、軋（zhá）破、離層、結疤、拉凹、凸包等。
A. Dangerous defects: cracks, internal folding, external folding, rolling, delamination, scarring, concave drawing, convex hull, etc.
b. 一般性缺陷：麻坑、青線、劃傷、碰傷（shāng）、輕微的內、外直道、輥（gǔn）印等。
B. General defects: pits, green lines, scratches, bruises, slight internal and external straight paths, roll prints, etc.
缺陷問題（tí）產生原（yuán）因：
The causes of defects are as follows:
① 由於管坯的表麵缺陷或內部缺陷所帶來的。
It is caused by the surface or internal defects of the billet.
② 生產過程中產生的，如軋製（zhì）工藝參數設計（jì）不正（zhèng）確，模具表麵不（bú）光滑，潤滑條件不（bú）好，孔（kǒng）型設（shè）計及（jí）調整不合理。
(2) During the production process, such as incorrect design of rolling process parameters, non-smooth surface of die, poor lubrication conditions, unreasonable pass design and adjustment.
③管坯(冷拔無縫鋼管（guǎn）)在加熱軋製，熱（rè）處理以（yǐ）及矯直過程中，如果因為（wéi）加熱（rè）溫度控製不（bú）當，變形不均勻，加熱冷卻速度不合理或矯直變形量太大而產生過大的殘餘應力，那麽也有可能（néng）導致冷拔無縫鋼管產生表麵裂紋。
(3) During hot rolling, heat treatment and straightening of cold-drawn seamless steel tube, if excessive residual stress occurs due to improper control of heating temperature, uneven deformation, unreasonable heating and cooling speed or excessive straightening deformation, surface cracks may also occur in cold-drawn seamless steel tube.
目前冷拔無縫鋼管常見的（de）缺陷問題已經在很（hěn）大程度上進行解決，後續還是要多從（cóng）鋼材的工藝上下手，才能在後續的（de）發展過程中取得一個較好的發展。
At present, the common defects of cold-drawn seamless steel tube have been solved to a great extent. In order to achieve a better development in the follow-up process, it is necessary to start with the steel technology.
