冷拔无缝钢管生产进程是将实心管坯或钢锭穿成空心的毛管，然后再将其轧制成所要求尺度的钢管。选用的穿孔和轧管办法不同，就构成了出产冷拔无缝钢管的不同办法。焊接钢管出产进程是将管坯(钢板或带钢)曲折成管状， 再把缝隙焊接起来成为钢管。因采用的成型和焊接办法不同，就构成了出产焊接钢管的不同办法。冷拔无缝钢管首要用热轧法出产。 揉捏法首要用于出产难穿孔的低塑性高合金钢管或冷拔异型钢管和复合金属管。冷轧和冷拔法可将热轧管继续加工成小直径和薄壁的钢管。焊接钢管工艺进程简略、出产效率高、成本低、产品品种日益扩大。

The production process of cold-drawn seamless steel tube is to pass solid billet or ingot into hollow capillary tube, and then roll it into required size steel tube. Different methods of piercing and rolling are used to produce cold-drawn seamless steel tubes. The production process of welded steel pipe is to bend the billet (steel plate or strip) into tubular shape, and then weld the gap into steel pipe. Because of the different forming and welding methods, the different methods of producing welded steel pipe are formed. Cold-drawn seamless steel pipes are mainly produced by hot rolling. The kneading method is mainly used to produce low-plastic high-alloy steel pipes or cold-drawn special-shaped steel pipes and composite metal pipes which are difficult to perforate. Hot-rolled pipes can be further processed into small diameter and thin-walled pipes by cold rolling and cold drawing. The process of welded steel pipe is simple, the production efficiency is high, the cost is low, and the product variety is expanding day by day. (1)规范：冷拔钢管的规范要求应在进出口贸易合同中列明。一般应包括规范的商标(品种代号)、钢筋的公称直径、公称分量(质量)、规则长度及上述目标的允差值等各项。我国规范引荐公称直径为8、10、12、16、20、40mm的冷拔钢管系列。供货长度分定尺和倍尺二种。我国出口螺纹钢定尺挑选规模为6～12m，日本产螺纹钢定尺挑选规模为3.5～10m。

(1) Specification: Specification requirements for cold-drawn steel pipes should be specified in import and export trade contracts. Generally, it should include the standard trademark (variety code), the nominal diameter of reinforcing bar, the nominal weight (quality), the regular length and the allowable difference of the above objectives. The cold-drawn steel pipe series with nominal diameters of 8, 10, 12, 16, 20 and 40 mm are recommended in Chinese codes. The length of supply is divided into two kinds: fixed length and double length. The selection scale of fixed length for export screw steel in China is 6-12m, and that for Japanese screw steel is 3.5-10m.

(2)外观质量：①外表质量。有关规范中对螺纹钢的外表质量作了规则，要求端头应切得平直，外表不得有裂缝、结疤和折迭，不得存在运用上有害的缺点等;②外形尺度误差允许值 。螺纹钢的曲折度及钢筋几许形状的要求在有关规范中作了规则。如我国规范规则，直条钢筋的曲折度不大于6mm/m，总曲折度不大于钢筋总长度的0.6%。

(2) Appearance quality: 1) Appearance quality. The external quality of threaded steel is regulated in the relevant codes, which requires that the ends should be cut straight, that there should be no cracks, scars and folds in the appearance, and that there should be no harmful defects in application, etc. (2) The allowable value of outline dimension error. The requirements for the bending degree of threaded steel and the shape of reinforcing bars are regulated in the relevant codes. For example, according to the code of our country, the bending degree of straight bars is not more than 6 m m/m, and the total bending degree is not more than 0.6% of the total length of bars.