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 and spiral submerged arc welding. "Straight seam steel pipe" (GB/T3091-2008) galvanizing for low-pressure fluid transportation (GB/T3091-2008) is also known as galvanized electric welded steel pipe, commonly known as white pipe general low-pressure fluid or other uses such as conveying water, gas, oil, heat Specification for straight seam steel pipes such as steam and warm water. The ER or the like is expressed by a nominal diameter (mm), and the nominal diameter is an approximation of the inner diameter. The outer diameter and wall thickness should meet the requirements of GB/T21835.




The length of straight seam steel pipe is generally 300mm-1200mm. Double-sided submerged arc welded straight seam steel pipe can be fixed or flanged. The perforation temperature of a straight seam steel tube varies with the raw material.




Most of the thermally expanded straight seam steel pipes are around 1200 ° C. When the carbon content and other alloying elements are large, the temperature is slightly lower. The second key to straightening steel tube heating is to minimize the amount of fouling. Especially in the hot-kneading elbow, the east-west life of the 16Mn straight seam steel pipe and the surface quality of the kneading pipe, the guilty plea is more serious. 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 divided into heating furnaces and heating furnaces according to their functions; the former is used to heat the steel slab from room temperature to the processing temperature; the latter is used to reheat the steel slab during the processing. The processing temperature required. Improper heating of straight seam steel tubes can cause cracking, folding and local pain on the inner or outer surface of the tube blank. There are many straightening methods for steel tube heating furnaces, but their main use is for trial furnaces. The furnace has a slowly convertible annular bottom that is loaded from the inlet along the diameter of the hearth and reversed for heating and soaking to normal temperatures. The key to the furnace 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 is an important condition affecting the quality of the perforation, in the perforation process, it is generally required to control the temperature of the casting blank.