Spiral steel pipe
The commonly used standards of spiral steel pipe are generally divided into: SY / t5037-2008 (ministry standard, also known as spiral submerged arc welded steel pipe for ordinary fluid transmission pipeline), GB / t9711.1-2008 (national standard, also known as technical delivery conditions for steel pipe for oil and natural gas industry). Part I: Grade a steel pipe (GB / t9711.2 is strictly required Api-5l (American Petroleum Institute, also known as pipeline steel pipe; which is divided into PSL1 and PSL2), SY / t5040-2008 (spiral welded steel pipe for pile).
ERW pipe
The standard for straight seam steel pipe is GB / t3091-2008 production standard for low-pressure fluid steel pipe, GB / t9711.1-2-1997 production and use standard for oil and gas pipe, and American API 5L pipeline steel pipe executive standard. Production materials: q195a-q345e; 245r; q345qa-d; l245-l485; x42-x70. The main bearing parameters are 2st / T, s is yield strength, t is wall thickness. Submerged arc welding has developed into double wire submerged arc welding and multi wire submerged arc welding, and the efficiency is further improved.
seamless steel tube
seamless steel tube
Seamless steel pipe is made of 10, 20, 30, 35, 45 and other high-quality carbon Bonded Steel 16Mn, 5mnv and other low-alloy structural steel, or 40Cr, 30CrMnSi, 45Mn2, 40MnB and other composite steel. 10. The seamless pipe made of 20 grade low carbon steel is mainly used for fluid transportation pipeline. The seamless pipe made of 45, 40Cr and other medium carbon steel is used to manufacture mechanical parts, such as the stressed parts of automobile and tractor. Generally, the strength and flattening test of seamless steel pipe shall be ensured. Hot rolled steel pipes are delivered as hot rolled or heat treated; cold rolled pipes are delivered in heat treated condition.
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