The inspection method can be to use soapy water to wipe the gaps of the joints of the annealing furnace to see if there is air leakage; the places where the air is most likely to escape are the place where the annealing furnace enters the pipe and the place where the pipe exits. The sealing ring in this place is particularly easy to wear. Always check and change frequently. The process scheme of pretreatment of Wuxi precision steel pipe before cold bending was put forward; the influence of normalizing temperature, holding time and cooling method on the structure and mechanical properties of raw material pipe was studied and analyzed; the conventional normalizing process of
precision steel pipe was determined : Heating temperature (890±10) ℃, keep warm for 6 minutes and then air-cool. Conventional normalizing process can completely eliminate the Widmanstatten structure of Energy Steel precision steel tube, making the matching of yield strength and tensile strength more reasonable, yield strength ratio σS/bσ≤0.78, elongation 5δ≥30%, and cold forming performance greatly improved And avoid cold bending cracking phenomenon. The coefficient of expansion can be expressed in terms of volume or length, and is usually expressed in terms of length. Density The density of a substance is the mass per unit volume of the substance, and the unit is kg/m3 or 1b/in3. The residual tensile stress mainly comes from the residual tensile stress generated by the equipment during the welding process. At present, annealing after welding cooling is widely used in engineering to eliminate residual stress, and post-welding cooling is an important process for residual stress generation. This method wastes energy and easily produces large welding residual stress. Post-weld heat treatment is a new technique for relieving residual stress. Before welding, Energy Steel Industrial
precision steel tube is preheated to the post-heat treatment temperature and the weldment is continuously heated to maintain this temperature during the welding process. After welding, insulation cotton is used to keep it warm and cool it down slowly. Quenching can increase the strength and hardness of the steel pipe, but reduce its plasticity. Quenching agents commonly used in quenching include water, oil, alkaline water and salt solutions. The tempering of
Energy Steel Industrial precision steel tube is to reheat the quenched
precision steel tube to a certain temperature, and then cool it by a certain method, which is called tempering. Its purpose is to eliminate the internal stress generated by quenching, reduce the hardness and brittleness, and obtain the expected mechanical properties. Tempering is divided into three categories: high temperature tempering, medium temperature tempering and low temperature tempering. Tempering is often used in conjunction with quenching and normalizing. Quenching and tempering The heat treatment method of high temperature tempering after quenching is called quenching and tempering.
