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News
Precautions for high-pressure pipeline welding, the main points
Views: 105 Update Date: Apr 27 , 2022
Alloy steel pipes are mainly used for high-pressure and high-temperature pipelines and equipment such as power plants, nuclear power, high-pressure boilers, high-temperature superheaters and reheaters. They are made of high-quality carbon steel, alloy structural steel and stainless heat-resistant steel. , by hot rolling (extrusion, expansion) or cold rolling (drawing).
Alloy pipes have hollow sections and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe is lighter in weight when the bending and torsional strength is the same. Alloy steel pipe is an economical section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission Axles, bicycle racks and steel scaffolding used in building construction, etc. Using alloy steel pipe to make ring parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. Alloy steel pipe is also an indispensable material for various conventional weapons, and the barrel, barrel, etc. must be made of steel pipe. Alloy steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes.
Alloy Steel Pipe Flaring Operation Technology
1. Preparation
1. Use a special steel pipe cutter (knife) or a hand saw to cut the alloy steel pipe to the required length L+0.5 mm.
2. Ensure that the cut surface of the steel pipe is at a right angle of 90° to the axis of the pipe.
3. Use a file and special tools to remove the outer diameter burr of the steel pipe incision, and use the internal deburring scraper to remove the inner diameter burr of the steel pipe.
4. Flatten the end face of the pipe, remove saw marks, wipe it clean, and remove all cutting foam and filings.
5. Use a clean lint-free rag to pull from the inside of the tube to clean the inner diameter of the tube until it looks clean to the naked eye.
2. Flaring operation technology
1. Select the correct flaring top cone according to the specifications of the alloy steel pipe, wipe it clean, and then put the flaring head.
2. Ensure that the cut surface of the alloy steel pipe is aligned with the surface of the mold, and adjust the distance to it.
3. The outer diameter of the flared end after flaring is about 1.2 times that before flaring (reference value).
4. The flared end forms a complete and obvious conical surface.
5. Wipe the flared part and check that the surface is round and smooth without cracks or cracks.
6. Use a brush to remove the burrs left on the outer surface of the tube in the groove of the mold.
7. The connection with the conical surface of the connector is intact.
3. Inspection
When necessary, a hydraulic test can be used to test the sealing performance of the alloy steel pipe flare. The test pressure should be carried out according to different pressure levels.
Alloy pipes have hollow sections and are widely used as pipelines for transporting fluids, such as pipelines for transporting oil, natural gas, gas, water and certain solid materials. Compared with solid steel such as round steel, alloy steel pipe is lighter in weight when the bending and torsional strength is the same. Alloy steel pipe is an economical section steel, which is widely used in the manufacture of structural parts and mechanical parts, such as oil drill pipe, automobile transmission Axles, bicycle racks and steel scaffolding used in building construction, etc. Using alloy steel pipe to make ring parts can improve the utilization rate of materials, simplify the manufacturing process, save materials and processing time, such as rolling bearing rings, jack sets, etc., which have been widely used in steel pipe manufacturing. Alloy steel pipe is also an indispensable material for various conventional weapons, and the barrel, barrel, etc. must be made of steel pipe. Alloy steel pipes can be divided into round pipes and special-shaped pipes according to the shape of the cross-sectional area. Since the area of the circle is the largest under the condition of equal perimeter, more fluid can be transported with a circular tube. In addition, when the ring section is subjected to internal or external radial pressure, the force is relatively uniform. Therefore, most steel pipes are round pipes.
Alloy Steel Pipe Flaring Operation Technology
1. Preparation
1. Use a special steel pipe cutter (knife) or a hand saw to cut the alloy steel pipe to the required length L+0.5 mm.
2. Ensure that the cut surface of the steel pipe is at a right angle of 90° to the axis of the pipe.
3. Use a file and special tools to remove the outer diameter burr of the steel pipe incision, and use the internal deburring scraper to remove the inner diameter burr of the steel pipe.
4. Flatten the end face of the pipe, remove saw marks, wipe it clean, and remove all cutting foam and filings.
5. Use a clean lint-free rag to pull from the inside of the tube to clean the inner diameter of the tube until it looks clean to the naked eye.
2. Flaring operation technology
1. Select the correct flaring top cone according to the specifications of the alloy steel pipe, wipe it clean, and then put the flaring head.
2. Ensure that the cut surface of the alloy steel pipe is aligned with the surface of the mold, and adjust the distance to it.
3. The outer diameter of the flared end after flaring is about 1.2 times that before flaring (reference value).
4. The flared end forms a complete and obvious conical surface.
5. Wipe the flared part and check that the surface is round and smooth without cracks or cracks.
6. Use a brush to remove the burrs left on the outer surface of the tube in the groove of the mold.
7. The connection with the conical surface of the connector is intact.
3. Inspection
When necessary, a hydraulic test can be used to test the sealing performance of the alloy steel pipe flare. The test pressure should be carried out according to different pressure levels.