Straight seam steel pipe definition:
Refers to the longitudinal and parallel steel pipe of the weld. It is also commonly referred to as a straight seam welded pipe or a straight seam steel pipe. The straight seam steel pipe is made by winding a long strip of certain specifications through a high frequency welding unit and welded by a straight seam. Straight seam steel pipe specifications with nominal diameter, according to the wall thickness can be divided into thin-walled straight seam steel pipe and thick-walled straight seam steel pipe two. According to the shape can be divided into round, square or shaped tubes.
Straight seam steel pipe technology:
Straight seam steel pipe generally adopts high-frequency welding, high-frequency welding is an induction welding (or pressure contact welding), it does not require welding filler material, no welding spatter, narrow welding heat affected zone, beautiful welding forming, good welding mechanical properties, etc. Because of its advantages, it has been widely used in the production of steel pipes. According to the electromagnetic induction principle and the skin effect, proximity effect and eddy current heat effect of AC charge in the conductor, the steel at the edge of the weld seam is locally heated to a molten state, and the butt weld is pressed by the roller to achieve intercrystalline bonding, thereby achieving For welding purposes, a solid, straight seam weld is formed after cooling.
Straight seam steel pipe implementation standards and materials:
Straight seam steel pipe generally adopts GB/T3091-2001 and GB/T9711.1-1997 standards. Commonly used materials are Q235, Q235B, 16Mn, 20#, Q345, L245, L290, X42, X46, X70, X80, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb.
Straight seam steel pipe use:
Straight seam steel pipe is mainly used in tap water projects, petrochemical industry, chemical industry, power industry, agricultural irrigation, and urban construction in China. For liquid transport: water supply, drainage. For gas transportation: gas, steam, liquefied petroleum gas. Used for structural purposes: as a pile driving pipe, as a bridge; piers, roads, building structures, etc.
Welded pipes are used especially for pipeline constructions and for larger dimensions in the process plants; any specifications and qualities are part of our supply program.
For example, we supply carbon steel pipes for pipeline projects throughout the world according to:
API 5L X 52, X60, X65, X70
Welded carbon and alloyed process plant pipes in acc. to below standards:
ASTM A333, 671, 672, 691
Welded Stainless steel, special alloys pipes for chemical and petrochemical plants to:
ASTM A 312, 358, 778, 928, ASTM B 619, B725
All materials are also available in acc. to equivalent DIN/ EN standards and grades.
application difference:
Straight seam steel pipes are mainly used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction. For the transport of liquids: water supply and drainage. For gas transportation: gas, steam, liquefied petroleum gas. For structural purposes: as piling pipe for bridges; docks, roads, buildings and other structures pipe.
General welded pipe is used to transfer low pressure liquid. It is made of Q195A, Q215A, Q235A steel and it can also be made of other mild steel. Steel pipe should have the text on pressure, bending, flattening and so on, and it has a certain request on the surface quality.
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