Changsha Xiangjia Metal Materical Co., Ltd.

SSAW steel pipe  is strip steel coil as the raw material, warm-extruded, and welded by an automatic double-wire double-sided submerged arc welding process. (1) The raw materials are strip coil, welding wire, and flux. Before going through the strict physical and chemical tests. (2) Strip steel head-to-tail butt joint, single wire or double wire submerged arc welding, automatic submerged arc welding repair welding after rolling into steel pipe. (3) Before forming, the strip is subjected to leveling, trimming, planing, surface cleaning and pre-bending. (4) The electric contact pressure gauge is used to control the pressure of the cylinder on both sides of the conveyor to ensure the smooth conveyance of the strip. (5) Roller molding with external control or internal control. (6) Weld gap control device is used to ensure that the weld gap meets the welding requirements, and the pipe diameter, misalignment and weld gap are strictly controlled. (7) Both internal and external

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Boiler tubes are divided into general boiler tubes and high-pressure boiler tubes according to the high-temperature performance they withstand. The gernal boiler tube and high-pressure boiler tube can be divided into various steel tubes according to their different requirements. Specification and Appearance (1) GB3087-2008 "Seamless Steel Tubes for Low and Medium Pressure Boilers". The specifications of steel tubes for boilers of various structures, with an outer diameter of 10 ~ 426mm, a total of 43 kinds. A total of 29 kinds of wall thickness 1.5 ~ 26mm. However, the outer diameter and wall thickness of the superheated steam pipe, large smoke pipe, small smoke pipe and arch brick pipe for locomotive boilers are otherwise specified. (2) GB5310-2008 "Seamless steel tubes for high-pressure boilers" hot-rolled tubes have an outer diameter of 22 ~ 530mm and a wall thickness of 20 ~ 70mm. The cold drawn (cold rolled) tube has an outer diameter of 10 ~ 108mm a

Domestic materials are Q235A, Q235B, 0Cr13, 1Cr17, 00Cr19Ni11, 1Cr18Ni9, 0Cr18Ni11Nb, 16Mn, 20 #, Q345, L245, L290, X42, X46, X70, X80 The billet used in the  LSAW steel pipe  is steel plate or strip steel. LSAW steel pipe divided into the following varieties due to different materials and uses: GB / T3091-2008 (Welded steel pipe for low-pressure fluid transportation). Mainly used for conveying water, gas, air, oil, heating hot water or steam and other low-pressure fluids and other use pipes. GB / T14291-2006 (Welding steel pipes for mine fluid transportation). Mainly used for LSAW steel pipes for mine pressure, drainage, shaft gas discharge. GB / T12770-2002 (stainless steel welded steel pipe for mechanical structure). Mainly used in machinery, automobiles, bicycles, furniture, hotel and restaurant decoration and other mechanical parts and structural parts. GB / T12771-1991 (stainless steel welded steel pipe for fluid transportation). Mainly used to transport low-pr