Stainless steel pipe types and production and transportation processes

The upper and lower heads are molded or spun. Butt jointing is the main way to assemble with the cylinder. All interface components are connected by mechanical flanges to ensure their characteristics. All welds must be no lower than the base metal. Ideally, they should be flush with the parent metal. If they are higher than the parent material, they must not be pitted or pitted. During the butt and welding process, it is necessary to ensure that there is no gap in the inner wall of the pipe. When welding, the argon gas in the pipe should be completely stopped for maintenance, and the purity of the argon gas should reach above 99%. All welds shall be free of porosity, slag inclusions and unevenness. After welding, the weld should be polished to make it delicate and bright. All pipes and joints shall be grooved during the manufacturing process. In the workplace, stainless steel and iron, copper and other materials should be strictly separated to ensure that the materials are not contaminated by iron and copper.

2. Material selection of stainless steel pipes
Stainless steel pipes should undergo non-destructive testing. If welding is used, the welded joints must be inspected and the welded joints must be smooth. Materials are selected according to the corrosiveness of the flowing liquid or gas, pipe diameter is selected according to the flow rate, seamless or welded pipes are selected according to the pressure requirements, and wall thickness is selected according to the wall pressure requirements. Gasketing materials for all valves, pipes and manholes shall be of acceptable quality.
Stainless steel welded pipes from stainless steel pipe manufacturers are used all over the country, so they also need to be transported well and protected during controlled transportation. Let’s talk about the problems of stainless steel welded pipes in transportation.
1. Hoisting of stainless steel pipes
When hoisting, special slings, such as slings, should be used. It is strictly prohibited to use wire rope to avoid scratching the surface. In addition, scratches caused by impacts and bumps should be avoided when lifting and placing.
2. Transportation of stainless steel pipes
During transportation, transportation tools (such as cars, battery cars, etc.) should be used, and they should be clean and isolated to prevent dust, oil and rust from contaminating the stainless steel. It is strictly prohibited to drag and avoid bumps and scratches.
Stainless steel pipes should have a special storage rack, which should be a wooden or carbon steel bracket, with the surface painted or rubber pads used to isolate it from other metal materials such as carbon steel. During storage, the storage location should be convenient for lifting and relatively isolated from other material storage areas, and protective measures should be taken to avoid contamination of stainless steel by dust, oil and rust.
For those who do business, of course it is better to spend as little as possible under feasible conditions. For products like stainless steel pipes, we can often see packaging film bags. Although it is not heavy, if the single purchase quantity is large, certain economic expenditure will be incurred. The editor will tell you why stainless steel pipes need packaging bags.
1. After the stainless steel pipe is built, it must be moved, moved, moved a long distance. If there is no packaging bag, there will be scratches and abrasions on the surface, which will affect the appearance of the surface.
2. The packaging itself requires manufacturing costs, and the packaging costs require labor costs. The sum of the two exceeds the weight of a single bag.
3. If packaging is not required, it should be stated in the contract that the company is not responsible for scratches or abrasions on the surface of the stainless steel pipe caused by opening the packaging bag.
Stainless steel classification: There are many types of stainless steel, with different uses and different production methods. The outer diameter of stainless steel pipes currently produced ranges from 0.1 to 4500mm, and the wall thickness ranges from 0.01 to 250mm. In order to distinguish their characteristics, steel pipes are usually divided into the following categories. Classification by production method Stainless steel pipes are divided into seamless pipes and welded pipes according to production methods. Seamless steel pipes are divided into hot-rolled pipes, cold-rolled pipes, cold-drawn pipes and extruded pipes. Cold-drawn pipes and cold-rolled pipes are Welded pipes for secondary processing of steel pipes include straight seam welded pipes, etc.
Classification by cross-sectional shape: Stainless steel pipes are divided into round pipes and special-shaped pipes according to cross-sectional shape. Special-shaped tubes include square tubes, rhombus tubes, elliptical tubes, hexagonal tubes, octagonal tubes and various asymmetrical cross-section tubes. Special-shaped tubes are widely used in various structures, hand tools, and mechanical parts. Compared with round pipes, special-shaped pipes generally have a larger moment of inertia and section modulus, which can save steel. Stainless steel pipes are divided into equal-section pipes and variable-section pipes according to their longitudinal cross-section shapes. Variable cross-section tubes include tapered tubes, step tubes, periodic cross-section tubes, etc.
Classification by material: Stainless steel pipes can be divided into ordinary carbon steel pipes, high-quality carbon structural steel pipes, alloy structural pipes, alloy steel pipes, bearing steel pipes, stainless steel pipes, bimetal Darlington pipes that save precious metals and meet special requirements, and electroplating and coated pipes, etc.