Zhejiang Max Stainless Steel Co., Ltd. is a modern stainless steel pipe manufacturing enterprise integrating scientific research, production and sales. The company adopts advanced, efficient and mature production management mode. The company chooses Walsin Lihwa and Yongxing Special Steel parent materials as the leading material for the production of high-quality stainless steel, providing the most reliable and safest stainless steel pipes and fittings for global users.
CNMAX has a number of cold drawing production lines, as well as a number of cold rolling units, CNC lathes and processing centers, mainly producing seamless pipes, bright and annealed pipes, heat exchange pipes, pipe fittings, flanges and other products.
Coiled tubing is an indispensable petroleum equipment in oilfield operations in the United States, Canada and other countries. Its single length can reach several kilometers, and it can be repeatedly bent and plastically deformed. It is a new type of petroleum pipe. Today, the longest coiled tubing in the world can be as long as 9000m.
So do you know what is the core manufacturing technology of coiled tubing?
The core manufacturing technologies of coiled tubing include:
1) Chemical elements. Coiled tubing has high requirements on the mechanical properties and corrosion resistance of its materials due to the harsh service environment. The chemical composition of the material is optimized. At the same time, it is necessary to realize the clean control of the whole process of smelting, rolling, etc., as much as possible. Reduce the content of inclusions and harmful elements such as S and P.
2) Processing technology. After the work hardening and the Bauschinger effect of the coiled tubing due to factors such as dislocation proliferation and other factors act together, the change law of the strength of the tubing body is controlled.
3) Welding technology. For low-carbon microalloyed steel, HFW welding technology is mainly used at present, and it is necessary to study the optimal welding process parameters (such as voltage, current, frequency, welding speed, forming angle, extrusion amount, etc.), weld seam and weld seam heat treatment technology.
4) Heat treatment technology. The best control of structure and performance is achieved through heat treatment of the pipe body, especially high strength, high plasticity and low residual stress.
5) Plate butt joint technology. To realize the continuous production of HFW welded pipes, the plates must be lengthened. Today’s plate butt joints mainly use methods such as TIG, MAG and plasma welding, and the method being studied is the friction stir welding method.
6) Pipe butt joint technology. Coiled tubing may be partially damaged during use, and the damaged part must be cut off. Connect the pipes by welding. The traditional butt joint method generally uses manual TIG welding, and the welding quality is difficult to control. Now, the fully automatic welding technology is used.
7) New manufacturing technology. For example, CVR technology, that is, the coiled tubing using the same specification tube blank is heated to 940°C by medium frequency induction. Through thermomechanical rolling, the wall thickness or diameter can be changed while realizing the optimization or seamlessness of the HFW weld. In addition, there are special stainless steel continuous tube laser welding technology.
Our company’s product materials can provide: austenitic stainless steel, duplex stainless steel, super duplex steel and nickel-based alloy steel and other materials are widely used in automobiles, petroleum, chemical industry, boilers, electric power, instrumentation, semiconductors, laboratories and other high-end field.
CNMAX has always taken “quality assurance, professional service, and customer satisfaction” as its corporate purpose, and its pioneering, pragmatic, and innovative entrepreneurial spirit will continue to contribute high-quality stainless steel products to the society, complement each other’s advantages, and work together to create a better world.