Steel pipe manufacturing method

By the way, let me ask you how the pipe is hot-rolled and cold-drawn. The more specific the better.

I don’t know what your equipment is used for, but generally heat-treated ones are better.

The answer is as follows: 1. Theoretically, the steel pipes used in pressure vessels may exist in both states, but generally hot-rolled ones are the most commonly used specifications, and very common ones can be made by cold drawing. 2. Cold-drawn steel pipes should be slightly more expensive because they are deeply processed. 3. Those who have studied heat treatment can conceptually know what the "normalized state" represents. The answer is definitely hot rolling.

I want to know why cold drawn pipe cannot be hot rolled pipe

Hot rolling is rolling above the recrystallization temperature, and cold rolling is rolling below the recrystallization temperature. Cold rolling is sometimes heated, but the temperature is relatively low. Work hardening will occur after cold rolling. If the forming requirements of the material are relatively high, annealing and cold rolling will be performed. Cold rolling can improve the strength and ensure the surface quality of the material. Therefore, generally speaking, it is better to choose cold-rolled low-carbon steel/stainless steel pipes. The dimensional accuracy, wall thickness, surface quality, and strength will be better than hot-rolled pipes.

I am also very interested in this person. When we choose steel pipes, should we choose cold-rolled pipes or hot-rolled pipes first?

Whether pipes for containers are cold rolled or hot rolled depends on the design requirements and the mechanical properties and uses of the pipes. Nowadays, many pipes that are large, thick and cannot be tapered are often made by using simple tooling molds to scribe and press, and then welded. Of course, the production cost will be relatively high.

Hot rolled seamless steel pipe: The blank is a cylindrical steel ingot, which is heated to a red state and pierced by a piercing machine before being rolled on a hot steel pipe rolling mill. The inner and outer diameter tolerances of its steel pipes are slightly larger than those of cold-rolled steel pipes, and the wall thickness dimensions are larger. conform to * * Standard, the steel pipe is in annealed state. Cold rolled seamless steel pipe: It is a hot-rolled steel pipe that is processed twice with a tube core on a cold-rolled steel pipe machine. Its dimensional accuracy is high and can be directly assembled with other parts, but its wall thickness and dimensions are generally smaller. Compliant with cold rolled steel pipe * * Standard size, the steel pipe is in the rolled hard state, and the annealed state can be provided when special needs are required. welded steel pipe: Welded steel pipes are made of steel plates that are precisely rolled and then welded. Generally, welded steel pipes are automatically welded on a steel pipe welding machine. Generally used to transport compressed air and fluid at low pressure. Such as tap water, compressed air pipelines, etc. Pressure vessel pipelines generally use hot-rolled seamless steel pipes. When selecting, it is necessary to calculate the wall thickness and diameter, as well as the weakening and reinforcement of the vessel.

There is a slight difference in the current market prices between the two. . .