Made with high-frequency and straight-seam welding technique, both ends flat, and each pipe water pressure tested. Characteristics: strong anti-pressure capacity, high mechanical strength, with uniform wall thickness, mainly used as pipes for fire fighting, water supplying, heating, gas supplying and oil transport in mines, oil fields and buildings, also as pipes for mechanical structures and buildings. We can shrink the diameter (groove), process screw thread, hoop pipe and make dustproof treatment according to the requirement or standard provided by customers. Standard 1、State and enterprise standard: GB/T3091- 2001 welded steel pipe for low-pressure liquid transport GB/T13793-1992 straight-seam welded steel pipe 2、American standard: ASTM A53 , etc. 3、UK state standard: BS1387 4、Germany state standard: DIN 2440/2441/2444, etc. 5、Japan industrial standard: JIS G3441/G3442/G3444/G3445/G3452/G3454/G3456 G3460/G3461/ G3462/G3464, etc.

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