First, the cold-drawn pipe standard
In the process of processing cold steel pipes, drawing, extrusion and perforation should be used for production, while in the production of steel pipes, one side should have a hollow section and the periphery should depend on whether there are welded round holes.
I believe everyone doesn't know much about cold-drawn tubes. Although we can often see its shadow, we don't know how it is made. What is the standard? Today, Bian Xiao will introduce the standards and prices of cold-drawn pipes to you.
The raw material of cold-drawn pipe is hot-rolled steel pipe. After pickling, the oxide scale of hot rolled steel pipe is removed, and then cold chain binding is carried out. The finished product is a rolled hard coil, because in the production process, continuous cooling makes the steel pipe deform, which further causes cold working hardening, which increases the strength and hardness of the rolled hard coil and decreases the toughness and plasticity index. Therefore, the stamping performance is also deteriorating, because it can only be used for simple deformed parts, and the rolled hard coil can also be hot galvanized.
Because the facilities of the hot-dip galvanizing line are degraded, generally speaking, the process of cold-drawn pipe is to pass through the bad foundation of the pipe, then heat it, then punch it, then anneal it, then fine acid wash it, then oil it, that is, copper plating, and then cold-draw it many times, that is, we call it cold rolling, as well as bad pipe and heat treatment. Finally, after straightening, it will go through water pressure test, commonly known as flaw detection, and finally it will be put into storage.
Cold-drawn pipe belongs to mechanical structure, and the size and accuracy of hydraulic equipment and the surface smoothness must be carefully calculated and designed. Moreover, precision seamless tube should be selected to manufacture mechanical structures and hydraulic equipment, which can greatly save working hours in mechanical processing, improve the utilization rate of materials and improve the rational use of goods.
Second, the price of cold-drawn pipes.
Standard extrusion/cold drawing pressure-corrosion resistance at home and abroad? 316,310s stainless steel seamless pipe? Price: 36.00.
16mn large diameter seamless steel pipe? Cold-drawn and hot-rolled thin-walled thick-walled seamless steel pipe? Price: 2.65.
ASTM？ A648- 1990a？ Cold-drawn steel wire for prestressed concrete pipeline? Price: 60 yuan
Authentic GB/T? 31315-2014 precision welded steel pipes for mechanical structures? Price: 12.5 yuan
Supply 20# seamless steel pipe? Hot rolled 45# seamless steel pipe? Cold-drawn 20# seamless steel tube Q345B seamless steel tube? Price: 3. 10 yuan
Long-term sales? 15CRMO seamless pipe? Cold drawn steel pipe factory? Alloy seamless steel pipe? Price: 6.50 yuan
Through the above introduction of cold-drawn pipe standards, I believe everyone knows something about cold-drawn pipes. Its production process is complex, but it is widely used. Every day, many construction industries cannot do without it. Cold-drawn tube is a new high-tech energy-saving product.
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