Longitudinal Seam Steel Pipe Standard: (GB/T3091-2008) This standard includes high frequency resistance welding of straight seam steel pipe (ERW straight seam steel pipe).


Straight Seam Steel Pipe (SAWL) and Spiral Submerged Arc Welding (SAWH). Longitudinal seam steel pipe (GB/T3091-2008) low-pressure fluid transmission galvanizing (GB/T3091-2008) is also known as galvanized welded steel pipe, commonly known as white pipe. Longitudinal seam steel pipe specifications are generally low-pressure fluid or other uses, such as conveying water, gas, air oil and heating steam, warm water, etc., expressed in nominal diameter (mm), nominal diameter is the approximate value of internal diameter. The outer diameter and wall thickness shall meet the requirements of GB/T 2185.


The length of straight seam steel pipe is usually 300 mm-1200 mm. Double-sided submerged arc welded straight seam steel pipe can be fixed or doubled. The piercing temperature of the straight seam steel tube billet varies according to the raw material.


Most of the thermal expansion straight seam steel pipes are around 1200 C. When the carbon content and other alloy elements are more, the temperature is slightly lower. The second key to correct the heating operation of steel tube is to minimize the scale. Especially in hot kneading bending, 16Mn straight seam steel pipe lives from East and West and the surface quality of kneading pipe is more serious. In the production process of 16Mn straight seam steel pipe, heating operation is a very important process to determine the product quality, because the initial processing is carried out in the hot state. Straight seam steel tubes, such as hot furnaces, can be divided into heating furnaces and heating furnaces according to their effects. The former is used to heat billets from room temperature to processing temperature, and the latter is used to reheat billets during processing.  The required processing temperature. The improper heating of the straight seam steel tube will lead to cracks, folding and local pain on the inner or outer surface of the billet. There are many ways to straighten steel tube heating furnace, but the main use is trial furnace. The furnace has an annular bottom, which can be converted slowly, and the billet is loaded from the inlet along the diameter of the furnace bottom, and used for heating and soaking at room temperature in the reverse direction. A stove. The key of this heating operation is to heat the billet evenly to a suitable temperature for processing. Because piercing has a great impact on quality, that is to say, the temperature in the process of piercing is an important condition affecting quality. It is usually necessary to control the billet temperature in the process of piercing.