Q235 straight seam steel pipes for DN20 low-pressure fluid transportation are sold all year round.

Song style straight seam steel pipe refers to a steel pipe whose weld seam is parallel to the longitudinal direction of the steel pipe. It is also generally called straight seam welded pipe or straight seam steel pipe. Straight seam pipes are made by rolling long strips of steel strips of a certain specification through high-frequency welding units and using straight seam welding. The specifications of straight-seam pipes are expressed in nominal diameter. According to the wall thickness, they can be divided into two types: thin-walled straight-seam pipes and thick-walled straight-seam pipes. According to the shape, it can be divided into round, square or special-shaped tubes. Usually divided into metric electric welded steel pipes, electric welded thin-walled pipes, transformer cooling oil pipes, etc. The production process of straight seam welded pipe is simple, the production efficiency is high, the cost is low, and the development is rapid. The strength of spiral welded pipes is generally higher than that of straight seam welded pipes. Welded pipes with larger diameters can be produced from narrower billets, and welded pipes with different diameters can also be produced from billets of the same width. But compared with straight seam pipes of the same length, the weld length is increased
~ and the production speed is lower.
Song Dynasty straight seam steel pipes are mainly used in water supply projects, petrochemical industry, chemical industry, electric power industry, agricultural irrigation, and urban construction.
Song Dynasty is used for liquid transportation
water supply and drainage. For gas transportation, coal gas, steam, and liquefied petroleum gas are used. It is used as piling pipes for structures, pipes for bridges, wharves, roads, building structures, etc. Product Features: Straight seam high-frequency welded steel pipe has small rebound and small residual stress during the forming process. The deformation hardening effect is small, and the geometric dimensions after rounding are accurate, which is beneficial to ensuring construction and welding quality. The straight seam high-frequency welded steel pipe weld bead has a good shape and is not prone to defects such as undercuts and misalignment of internal and external welds. The straight seam steel pipe weld bead is distributed at one point on the circumference, so the weld can be placed at a favorable position according to the usage requirements.
Song style material
Song style standard
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Song style specifications
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Song style theoretical weight formula (outer diameter
wall thickness) *Wall thickness*./*Number of meters and tons
High-frequency welded straight seam steel pipe specifications are as follows. Straight seam high-frequency welded steel pipes have the characteristics of relatively simple process and rapid continuous production. They are widely used in civil construction, petrochemical, light industry and other departments. Has a wide range of uses. It is mostly used to transport low-pressure fluid or be made into various engineering components and light industrial products. The straight seam high-frequency welded steel pipe has advanced forming technology, reliable quality, good welding position, stable welding parameters, fast welding speed and high output. The equipment and technology of the entire production line are at the current international level. Product Features: Straight seam high-frequency welded steel pipe has small rebound and small residual stress during the forming process. The deformation hardening effect is small, and the geometric dimensions after rounding are accurate, which is beneficial to ensuring construction and welding quality. The straight seam high-frequency welded steel pipe weld bead has a good shape and is not prone to defects such as undercuts and misalignment of internal and external welds. The straight seam steel pipe weld bead is distributed at one point on the circumference, so the weld can be placed at a favorable position according to the usage requirements. Straight seam welded steel pipes are made by rolling long strips of steel strips of certain specifications into round tubes through high-frequency welding units and welding straight seams. Welded steel pipes should be subjected to mechanical performance tests, flattening tests and expansion tests, and To meet the requirements specified in the standard. The steel pipe should be able to withstand a certain internal pressure. If necessary, a pressure test should be carried out to ensure that there is no leakage for one minute. It is allowed to use eddy current flaw detection method instead of hydrostatic test. Eddy current flaw detection is performed in accordance with the "Eddy Current Flaw Detection Inspection Method for Steel Pipes" standard. The eddy current flaw detection method is to fix the probe on the frame, keep a distance between the flaw detection and the weld, and rely on the rapid movement of the steel pipe to conduct a comprehensive scan of the weld. The flaw detection signal is automatically processed and automatically sorted by the eddy current flaw detector to achieve flaw detection. the goal of.
Songti high-frequency welding is based on the principle of electromagnetic induction and the skin effect, proximity effect and eddy current thermal effect of AC charges in the conductor, so that
Songti weld
Songti edge steel is locally heated to melt state, through the extrusion of the roller, the butt weld is inter-granularly bonded, thereby achieving the purpose of welding. High-frequency welding is a kind of induction welding
(or pressure contact welding). It does not require weld filler and has no welding spatter.
Songti welding heat affected zone
Songti is narrow and the welding shape is beautiful. Due to its advantages such as good welding mechanical properties, it is widely used in the production of steel pipes.
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