Standard for straight seamless steel pipes

　　Straight seam steel pipe standard: (GB/T3091-2008) This standard includes straight seam steel pipe high frequency resistance welding (ERW straight seam steel pipe),


　　Straight seam steel pipe (SAWL) steel pipe and spiral submerged arc welding (SAWH). Straight seam steel pipe (GB/T3091-2008) galvanizing for low pressure fluid transportation (GB/T3091-2008) also known as galvanized electric welded steel pipe, commonly known as white pipe The specifications for straight-slit steel pipes for general low-pressure fluids or other uses such as conveying water, gas, air oil and heating steam, warm water, etc. are expressed by the nominal diameter (mm), and the nominal diameter is an approximate value of the inner diameter. The outer diameter and wall thickness should meet the requirements of GB/T21835.


　　Straight seam steel pipe length is usually 300mm-1200mm. Double-sided submerged arc welded straight seam steel pipe can be fixed or doubled. The perforation temperature of the straight seam steel pipe billet varies depending on the raw material.


　　The hot-expanded straight seam steel pipe is mostly around 1200 °C, and the temperature is slightly lower when the carbon content and other alloying elements are more. The second key to straightening steel pipe heating operations is to minimize the amount of scale. Especially in the hot kneading elbow, 16Mn straight seam steel pipe from the east and west life and the surface quality of the kneading pipe, the pleading is more severe. Straight seam steel pipe In the production process of 16Mn straight seam steel pipe, since the primary processing is carried out in a hot state, the heating operation is a very important process for determining the quality of the product. Straight seam steel pipes, such as hot furnaces, are classified into heating furnaces and reheating furnaces according to their effects; the former is used to heat the billets from room temperature to the processing temperature; the latter is used to reheat the billets during processing. The required processing temperature. The improper heating of the straight seam steel pipe will be the cause of cracks, folding and partial pain on the inner surface or the outer surface of the tube blank. There are many ways to straighten steel pipe heating furnaces, but the primary use is a probation furnace. The furnace has an annular furnace bottom which can be slowly converted, and the blank is loaded from the inlet along the diameter of the furnace bottom, and the reverse is used to heat and soak to the regular temperature. A stove. The key to this heating operation is to uniformly heat the billet to a temperature suitable for processing. Since the perforation has a great influence on the quality, that is, the temperature during the perforation processing is an important condition affecting the quality, it is generally necessary to control the billet temperature during the perforation processing.