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Production of precision steel pipes

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Precision pipe is a high-precision, high-brightness seamless steel pipe produced by cold drawing or cold rolling. Its inner and outer diameters can be accurate to within 0.2mm, and it is light in weight while ensuring the same bending and torsional strength, so it is widely used in the manufacture of precision mechanical parts and engineering structures. It is also commonly used to produce various conventional weapons, barrels, shells, bearings, etc.


Precision steel pipe is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. Due to the advantages of no oxide layer on the inner and outer walls of the precision steel tube, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components, such as cylinders. The oil cylinder can be a seamless pipe or a welded pipe.

Classification of steel pipes

Steel pipes can be divided into two categories according to the production method: seamless steel pipes and seamed steel pipes, and seamed steel pipes are referred to as straight seam steel pipes.

1. According to the production method, seamless steel pipes can be divided into: hot rolled seamless pipes, cold drawn pipes, precision steel pipes, hot expanded pipes, cold spinning pipes and extruded pipes, etc. Seamless steel pipes are made of high-quality carbon steel or alloy steel, and are divided into hot-rolled and cold-rolled (drawn). The main feature of seamless steel pipe is that it has no welded seams and can withstand greater pressure. Products can be very rough as-cast or cold drawn.

2. Welded steel pipes are divided into furnace welded pipes, electric welding (resistance welding) pipes and automatic arc welded pipes because of their different welding processes. They are divided into straight seam welded pipes and spiral welded pipes because of their different welding forms. For round welded pipes and special-shaped (square, flat, etc.) welded pipes.

Welded steel pipes are made of rolled steel plates with butt or spiral seams. In terms of manufacturing methods, they are further divided into welded steel pipes for low-pressure fluid transportation, spiral seam electric welded steel pipes, direct coiled welded steel pipes, and electric welded pipes. Seamless steel pipes can be used for liquid pneumatic pipelines and gas pipelines in various industries. Welded pipes can be used for water pipes, gas pipes, heating pipes, electrical pipes, etc.

Precision steel pipes

1. What is precision steel pipe

Precision steel pipes are products that have appeared in recent years, mainly because the inner hole and outer wall dimensions have strict tolerances and roughness. Precision steel pipe is a kind of high-precision steel pipe material processed by cold drawing or hot rolling. Due to the advantages of no oxide layer on the inner and outer walls of the precision steel tube, no leakage under high pressure, high precision, high finish, no deformation in cold bending, no flaring, no cracks in flattening, etc., it is mainly used to produce products for pneumatic or hydraulic components, such as cylinders or cylinder.

2. The role of precision steel pipes

In industrial equipment materials, different types of steel pipes can be said to be commonly used building materials, and steel pipes play a very important role in all construction, industry, and transportation equipment. Among them, precision steel pipe is a very common industrial steel pipe material in the industry.

Compared with ordinary steel pipes, although the cost of precision steel pipes has risen to a certain extent, it can bring us more convenience in the process of application. In simple terms, in terms of the two characteristics of no leakage and no deformation after cold bending, the quality of most ordinary steel pipes cannot be achieved. Therefore, we are in the industrial components of hydraulic components that have very high requirements for steel pipe materials. The excellent performance of precision steel pipes can often be seen.

3. Basic uses of precision steel pipes

Precision steel pipes are widely used in automobiles, motorcycles, electric vehicles, petrochemicals, electric power, ships, aerospace, bearings, pneumatic components, seamless steel pipes for medium and low pressure boilers, etc.

4. Production process of precision steel pipes

The production process of precision steel pipes is the same as that of ordinary seamless pipes, except that there is an additional process of final pickling and cold rolling.

5. Process flow of precision steel pipe

Tube blank - inspection - peeling - inspection - heating - perforation - pickling and passivation - grinding - lubrication and air drying - cold rolling - degreasing - cutting head - inspection - marking - -Product packaging

6. Product model of precision steel pipe

The precision steel pipe has high dimensional accuracy and high surface finish, and there is no oxide film on the inner and outer surfaces of the steel pipe after heat treatment. deal with.

Main production precision steel pipe grades: 10#, 20#, 35#, 45#, 40cr, 42crmo, 16mn, etc.

After negotiation, other grades of precision seamless steel pipes can also be supplied.

7. Advantages of precision steel pipes

(1). The outer diameter of the precision steel pipe can be smaller.

(2). Precision steel pipes can be produced in small batches.

(3). Precision steel pipe cold drawn finished products have high precision and good surface quality.

(4). The cross-sectional area of the precision steel pipe is more complicated.

(5). The performance of the precision steel pipe is better and the metal is denser.

8. Calculation formula of precision steel pipe

[(outer diameter-wall thickness) * wall thickness] * 0.02466 = kg/meter (weight per meter)

9. Chemical composition of precision steel pipes

The chemical composition of precision steel pipe is carbon C, silicon Si, manganese Mn, sulfur S, phosphorus P, chromium Cr.

10. The difference between precision steel pipe and seamless steel pipe

(1). The main feature of seamless steel pipe is that it has no welded seams and can withstand greater pressure. Products can be very rough as-cast or cold drawn.

(2). Precision steel pipe is a product that has appeared in recent years, mainly because the inner hole and outer wall have strict tolerances and roughness.

 


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