Common knowledge of smls pipes

Common knowledge of smls pipes

Basic introduction:

SMLS pipe is a long strip of steel with a hollow section and no seams around it. It is made of steel ingot or solid tube blank by perforation, and then made by hot rolling, cold rolling or cold drawing.

Uses of smls pipe:

The application of smls pipe mainly reflects three major fields. One is the construction field, which can be used for underground pipeline transportation, including groundwater extraction when building buildings. The second is the processing field, which can be used in machining, bearing sleeves, etc. The third is the electrical field, including pipelines for gas transmission and fluid pipelines for hydroelectric power generation.

For example, smls pipe are used in structures, fluid transportation, low and medium pressure boilers, high pressure boilers, fertilizer equipment, oil cracking, geological drilling, diamond core drilling, oil drilling, ships, automobile axle casings, diesel engines, etc. The use of smls pipe can avoid problems such as leakage, ensure the use effect, and improve the utilization rate of materials.

What to do with smls pipe?

1. Cutting process
When the smls pipe is in use, it can be cut. The purpose of cutting is to meet the needs of use. Therefore, the length and other dimensions must be measured before cutting, so as to meet the needs of use. When cutting, it is necessary to choose a suitable tool. Generally, there are metal saws, toothless saws and other tools that can be used for cutting. , hot iron beans, etc.
2. Grinding treatment
After the smls pipe is cut, it is necessary to grind the cut nozzle, which can be ground with an angle grinder. The purpose of grinding is to avoid the melting or burning of the plastic layer during the welding operation, which will cause the pipeline to be damaged.
3. Plastic coating treatment
After the smls pipe is polished, it needs to be protected by plastic coating, that is, heating with oxygen and C2H2 at the nozzle will cause partial melting, and then apply plastic powder, which must be applied in place and ensure uniformity. If it is a flange For the plate, it needs to be applied to the position above the water stop line. When heating, the temperature should be well controlled to avoid bubbles generated by too high temperature, and also avoid the problem of plastic layer falling off caused by too low temperature to melt the plastic powder.

How to deal with the rusty smls pipe?

1. Cleaning
The stainless steel pipe is cleaned by cleaning. When cleaning, the surface of the steel should be cleaned with solvents and emulsions. This method is only used as an auxiliary means of anti-corrosion, and it cannot really remove the rust of the stainless steel pipe. We can also use tools such as steel brushes and wire balls to remove the loose scale and rust on the surface before cleaning.
2. Spray derusting
Spray derusting is adopted, and the high-power motor drives the spray blades to rotate at high speed, so that abrasives such as steel grit, steel shots, iron wire segments, minerals, etc. are sprayed on the surface of the stainless steel pipe under the action of centrifugal force. Not only can rust, oxides and dirt be completely removed, but the steel pipe can also achieve the required uniform roughness under the action of violent impact and friction of abrasives. Spray rust removal is an ideal rust removal method in pipeline anticorrosion methods.
3. Pickling
Pickling is also one of the ways to remove rust. Generally, two methods of chemical and electrolytic pickling are used for pickling treatment. Only chemical pickling is used for pipeline anticorrosion. Although this method can achieve a certain degree of cleanliness, it is easy to cause pollution to the environment, so it is not recommended to use.

How to identify fake and inferior smls pipe?

1. Easy to scratch
False and inferior smls pipe are easy to scratch. The reason is that the manufacturers of false and inferior smls pipe have poor equipment, which is prone to burrs and scratches on the surface of the steel. Deep scratches reduce the strength of the steel.
2. No metallic luster
Shoddy smls pipe have no metallic luster and are light red or similar in color to pig iron.
3. The transverse rib is thin and low
The horizontal ribs of fake and inferior smls pipe are thin and low, and the phenomenon of fullness often occurs. The reason is that in order to achieve a large negative tolerance, the reduction in the first few passes of the finished product is too large, the iron shape is too small, and the hole shape is not full.
4. The cross section is oval
The cross-section of fake and inferior smls pipe is elliptical. The reason is that in order to save materials, the reduction in the first two passes of the finished roll is too large. standard.
5. Bumpy
The composition of high-quality smls pipe is uniform, the tonnage of cold shears is high, and the end face of the cutting head is smooth and neat, while the inferior smls pipe often have the phenomenon of meat loss on the end face of the cutting head due to poor material, that is, unevenness and no metallic luster. . Moreover, because the products of fake and inferior manufacturers have fewer heads, big ears will appear at the head and tail.
6. Many impurities
The material of fake and inferior smls pipe contains many impurities, the density of the steel is relatively small, and the size is seriously out of tolerance, so it can be weighed and checked without a vernier caliper. Generally speaking, the whole phase weighing effect will be better, mainly considering the cumulative error and probability theory.