In the production process of straight seam steel pipe, the processing method will have a lot of influence on it. So what are the processing methods for straight seam steel pipes? The staff of the manufacturer will introduce the main methods for you. Using the repeated impact of the forging hammer, the shape and size of the blank can be changed to meet the production requirements. This is the forging steel processing method. Applying pressure through a press also has the same effect. Extrusion is also a very important method of making straight seam steel pipes. It is a method of pressing steel in a closed extrusion container so that the product will get the desired size and shape when it comes out of the mold. The rolling method is also widely used, which changes the shape through the gap between the rolls. Drawn steel is often used for cold working, adding length and reducing cross-sectional area by applying tension to the metal.
Processing technology of straight seam steel pipe:
1. Forging steel: a pressure processing method that uses the reciprocating impact force of the forging hammer or the pressure of the press to change the blank into the shape and size we need.
2. Extrusion: It is a processing method in which steel puts metal in a closed extrusion box, and one end applies pressure to make the metal extrude from the specified die hole to obtain a finished product with the same shape and size. It is mostly used for the production of non-ferrous metal material steel.
3. Rolling: A pressure processing method in which the steel metal billet passes through the gap between a pair of rotating rolls (various shapes), and the cross-section of the material is reduced and the length is increased due to the compression of the rolls.
4. Pulling steel: It is a processing method in which the rolled metal blank (type, pipe, product, etc.) is pulled through the die hole to reduce the cross-section and increase the length. Most of them are used for cold processing.
Inspection steps of straight seam steel pipe:
1. Straight seam steel pipes should be submitted for acceptance in batches, and the batching rules should comply with the provisions of the corresponding product standards.
2. The inspection items, sampling quantity, sampling location, and test method of straight seam steel pipe shall be by the provisions of the corresponding product standards. With the consent of the purchaser, hot-rolled seamless straight seam steel pipes can be sampled in batches according to the number of rolling roots.
3. In the test results of straight seam steel pipes, if a certain item does not meet the requirements of the product standard, the unqualified ones should be picked out, and double the number of samples should be randomly taken from the same batch of straight seam steel pipes for inspection of unqualified items. recheck. If the re-inspection result (including any index required by the project test) is unqualified, the batch of straight seam steel pipes shall not be delivered. For the following inspection items, if the preliminary inspection fails, re-inspection is not allowed: 1) There are white spots in the low-magnification structure; 2) Microstructure.
4. For the straight seam steel pipes whose re-inspection results are unqualified (including the unqualified microstructure of the initial inspection results, and items that are not allowed to be re-inspected), the supplier can submit them for acceptance one by one; or re-heat treatment (the number of re-heat treatments shall not exceed two times) ), to submit a new batch for acceptance.
5. If there is no special regulation in the product standard, the chemical composition of the straight seam steel pipe shall be checked and accepted according to the melting composition.
The straight seam steel pipe is used to transfer fluid and powder, exchange heat and manufacture mechanical parts and containers, and what’s more, it is a kind of economical steel. The use of straight seam steel pipes to manufacture building structure grids, pillars, and mechanical supports can reduce weight, save 20-40% of metal, and realize factory-like mechanized construction. The use of straight seam steel pipes to manufacture highway bridges can not only save steel and simplify construction but also greatly reduce the area of the protective layer, saving investment and maintenance costs. Therefore, there isn’t any other type of steel product that can replace the steel pipe, but steel pipe can replace part of sections and bars. From people’s daily utensils, furniture, water supply, drainage, gas supply, ventilation, and heating facilities to the manufacture of various agricultural machinery, the development of underground resources, and the guns, bullets, missiles, rockets, etc. are inseparable from straight seam steel pipes. Just because straight seam steel pipes are inseparable from human life and production activities, the production technology of straight seam steel pipe industry not only develops rapidly but also introduces new ones. The production of straight seam steel pipes occupies an irreplaceable position in the iron and steel industry. The development of straight seam steel pipe production technology began in the construction manufacturing industry. The development of oil in the early 19th century, the manufacture of ships, boilers, and aircraft during the two world wars, the manufacture of thermal power boilers after the First World War, the development of the chemical industry, and the drilling and transportation of petroleum gas all strongly promoted the direct The development of seam steel pipe industry in terms of variety, output, and technology.
Post time: Dec-14-2022