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Process Treatment of Q355B Seamless Steel Pipes
Jan 24, 2021
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Let us make a summary and reflection on the causes of welding deformation of Q355B seamless steel pipes.
The key to the deformation of Q355B seamless steel pipes is that welding closing force crosses the compressive strength of butt weld. If only one welding line can be welded on both sides, the back welding should be started from the middle and south part, that is, the second welding should be stopped at the arc starting place. Selecting smaller welding line kinetic energy (The welding line kinetic energy is directly proportional to the current scale, but inversely proportional to the welding speed), means that the smaller welding current and sensitive welding speed can be used. In addition, Q355B seamless steel pipes are used for decoration planning (GB/T18705-2002). Stainless steel welding materials are used for building decoration planning (JG/T3030-1995). Large diameter electric welding steel pipes are used for bottom pressure hydrodynamics transportation (GB/T3091-2001), and welding materials are used for heat exchangers (YB4103-2000). The Q355B seamless steel pipe is a kind of square pipe, that is to say, seamless steel pipes are with the same length. Hot rolled strips are produced according to the processing technology. The hot-rolled strips are processed to form a round steel pipes according to the unpacking, flat, coiling, electric welding, and then they are processed by cold-rolled by round steel pipes inspection. The Q355B seamless steel pipe will be cut into the required length.
The key to the deformation of Q355B seamless steel pipes is that welding closing force crosses the compressive strength of butt weld. If only one welding line can be welded on both sides, the back welding should be started from the middle and south part, that is, the second welding should be stopped at the arc starting place. Selecting smaller welding line kinetic energy (The welding line kinetic energy is directly proportional to the current scale, but inversely proportional to the welding speed), means that the smaller welding current and sensitive welding speed can be used. In addition, Q355B seamless steel pipes are used for decoration planning (GB/T18705-2002). Stainless steel welding materials are used for building decoration planning (JG/T3030-1995). Large diameter electric welding steel pipes are used for bottom pressure hydrodynamics transportation (GB/T3091-2001), and welding materials are used for heat exchangers (YB4103-2000). The Q355B seamless steel pipe is a kind of square pipe, that is to say, seamless steel pipes are with the same length. Hot rolled strips are produced according to the processing technology. The hot-rolled strips are processed to form a round steel pipes according to the unpacking, flat, coiling, electric welding, and then they are processed by cold-rolled by round steel pipes inspection. The Q355B seamless steel pipe will be cut into the required length.
It's 50 pieces per bale. The compressive strength refers to the function of Q355B seamless steel pipes preventing the damage (proper plastic deformation or cracking). The effective methods of load include stretching, tightening, winding, cutting and so on. It is appeared that all kinds of pressure resistance strengthes are in often certain contact with each other. There are more pressure resistance strength taking as the essence of the pressure resistance strength needles. The strength of pressure resistance and the lethality of damage control makes it clear that the ductility of death is as good as home. The relaxation annealing of Q355B seamless steel tubes are used for ingot, billet and casting. The purpose of relaxation annealing is to eliminate component segregation and stress. It can be also used to lower the hardness and the function of steels. The heating temperature of relaxation annealing is AC 150-200 ℃, and the cool criterion is to wake up the air after the furnace temperature reaches 250 ℃. The relaxation annealing of Q355B seamless steel tubes can be interrupted in the special annealing furnace or in the heating process before the bloom rolling.
