The surface heat treatment technology of the 45th thick-walled
seamless steel pipe is constantly being innovated, and the current technology has been developed more and more sophisticated. Let's take a look at several methods of 45-thick thick-walled seamless pipe processing.
1. Surface hardening:
Rapid heating of No. 45 thick-walled seamless pipe by different heat sources, when the surface temperature of the part reaches above the critical point (when the temperature of the 45# seamless pipe core is below the critical point), it is quickly cooled, so that 45# seamless The surface of the tube is hardened and the heart remains in its original tissue. The most widely used in the industry is induction heating and flame heating surface quenching.
2. Chemical heat treatment:
The 45# seamless tube is placed in a medium containing active elements to heat and keep warm, so that the active atoms in the medium penetrate into the surface layer of the 45-thick thick-walled seamless tube or form a coating of a compound to change the texture and chemical composition of the surface layer. Therefore, the surface of the part has special mechanical or physicochemical properties.
3. Contact resistance heating quenching:
Similar to the electric resistance welded pipe, a voltage of less than 5 volts is applied to the 45# seamless pipe through the electrode, a large current flows at the contact of the electrode with the 45# seamless pipe, and a large amount of resistance heat is generated, so that 45# is absent. The surface of the seam tube is heated to the quenching temperature, and then the electrode is removed, and the heat is transferred into the interior of the 45# seamless tube and the surface is rapidly cooled, that is, the quenching purpose is achieved.
4. Electrolytic heating quenching:
The 45th thick-walled seamless tube is placed in an electrolyte of an acid, alkali or salt aqueous solution, and the 45# seamless tube is connected to the cathode, and the electrolytic tank is connected to the anode. After the direct current is turned on, the electrolyte is electrolyzed, oxygen is released on the anode, and hydrogen is discharged on the seamless tube No. 45. Hydrogen forms a gas film around the 45# seamless tube, which becomes a resistor to generate heat. The surface of the 45th thick-walled seamless tube is rapidly heated to the quenching temperature, and then the electricity is cut off, the film immediately disappears, and the electrolyte becomes a quenching medium. , so that the surface of the 45# seamless pipe is rapidly cooled and hardened.
5. Laser heat treatment:
The application of laser in heat treatment began in the early 1970s, and then entered the production application stage from the laboratory research stage. When a focused high energy density (10 W/cm) laser illuminates the metal surface, the metal surface rises to the quenching temperature in a few hundredths of a second or even a few thousandths of a second.
The above several heat treatment technologies are now more advanced technologies, and the performance requirements of the 45th thick-walled seamless pipe have been improved very well. Now the market development of the 45th thick-walled seamless pipe is getting better and better, I believe that follow-up The market for the 45th thick-walled seamless pipe will be even broader.
