GB/T3639-2000冷拔或冷軋精密無縫鋼管）。主要用于機械結構、碳壓設備用的、要求尺寸精度高、表面光潔度好的鋼管。其代表材質20、45鋼等。   

GB/T3094-2012（冷拔無縫鋼管異形鋼管）。主要用于制作各種結構件和零件，其材質為優(yōu)質碳素結構鋼和低合金結構鋼。

異型管生產之后必須進行相應檢測，以確保鋼管的質量。常用的檢測方法主要有以下五種：利用一些物理現象進行測定或檢驗的方法。異型管、異型管等管材內部缺陷情況的檢查，一般都是采用無損探傷的方法，比如超聲波探傷、射線探傷、滲透探傷、磁力探傷等。

Corresponding inspection must be carried out after special-shaped pipe production to ensure the quality of steel pipe. There are five commonly used detection methods: using some physical phenomena to determine or test the method. Non-destructive testing methods are generally used to inspect the internal defects of special-shaped pipes, special-shaped pipes and other pipes, such as ultrasonic testing, ray testing, penetration testing, magnetic testing, etc. 異型管的強度檢測，常見的方法有水壓試驗和氣壓試驗兩種。它們都能檢驗在壓力下管道的焊縫致密性。氣壓試驗比水壓試驗更為靈敏和速，同時檢測后的異型管不用排水處理，對于排水困難的產品尤為適用。但試驗的危險性比水壓試驗大。進行檢測時，必須遵守相應的安全技術措施，以防過程中發(fā)生事故。

There are two common methods for strength testing of special-shaped pipes: hydraulic test and barometric test. They can test the weld tightness of pipelines under pressure. The air pressure test is more sensitive and faster than the water pressure test. At the same time, the special-shaped pipe after testing does not need drainage treatment, which is especially suitable for products with difficult drainage. But the test is more dangerous than the hydraulic test. In order to prevent accidents in the process of inspection, corresponding safety and technical measures must be observed.

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