In the process of making straight seam steel pipes, 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 several main methods to you. By 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 for making straight seam steel pipes. It is a method of placing steel in a closed extrusion container for pressing so that the product will get the desired size and shape when it comes out of the mold. The use of rolling methods is also very common. It changes the shape through the gap between the rollers. Drawing steel is usually used for cold processing, which increases the length and reduces the cross-sectional area by applying tension to the metal.
Processing technology of straight seam steel pipes:
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 the metal is placed in a closed extrusion cylinder, and pressure is applied at one end to extrude the metal from the specified die-hole to obtain a finished product with the same shape and size. It is mostly used to produce non-ferrous metal steel.
3. Rolling: It is a pressure processing method in which the steel metal billet passes through the gap (various shapes) of a pair of rotating rollers, and the material cross-section is reduced and the length is increased due to the compression of the rollers.
4. Drawing steel: It is a processing method in which the rolled metal billet (profile, tube, product, etc.) is drawn through the die hole to reduce the cross-section and increase the length. It is mostly 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 batch rules should comply with the provisions of the corresponding product standards.
2. The inspection items, sampling quantity, sampling location, and test methods of straight seam steel pipes 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 rolling root group.
3. If a certain item of the straight seam steel pipe test result does not meet the requirements of the product standard, the unqualified ones should be selected, and double the number of samples should be randomly selected from the same batch of straight seam steel pipes for re-inspection of the unqualified items. If the re-inspection result (including any index required by the test of the item) is unqualified, the batch of straight seam steel pipes shall not be delivered. The following inspection items are not allowed to be re-inspected when the initial inspection fails:
1) White spots in the macrostructure;
2) Microstructure.
4. For straight seam steel pipes with unqualified re-inspection results (including items where the microstructure of the initial inspection results is unqualified and re-inspection is not allowed), the supplier may submit them for acceptance one by one; or re-heat treat them (the number of re-heat treatments shall not exceed two times) and submit them for acceptance in a new batch.
5. If there is no special provision in the product standard, the chemical composition of the straight seam steel pipe shall be accepted according to the smelting composition.
Straight seam steel pipes are not only used to transport fluids and powdered solids, exchange heat energy, and manufacture mechanical parts and containers, but they are also economical steel. Using straight seam steel pipes to manufacture building structure grids, pillars, and mechanical supports can reduce weight, save 20-40% of metal, and realize factory-based mechanized construction. Using straight-seam steel pipes to manufacture highway bridges can not only save steel and simplify construction but also greatly reduce the area of protective coating, saving investment and maintenance costs. Therefore, no other type of steel can replace straight seam steel pipes, but straight seam steel pipes can replace some profiles and bars. From people’s daily utensils, furniture, water supply and drainage, gas supply, ventilation, and heating facilities to the manufacture of various agricultural machinery and tools, the development of underground resources, guns, bullets, missiles, rockets used in national defense and aerospace, etc., straight seam steel pipes are indispensable.
Precisely because straight seam steel pipes are inseparable from human life and production activities, the production technology of the straight seam steel pipe industry has not only developed rapidly, but also been innovative, and straight seam steel pipe production occupies an irreplaceable position in the 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 World War I, the development of the chemical industry, and the drilling and transportation of petroleum gas have all strongly promoted the development of the straight seam steel pipe industry in terms of variety, output, and price.
Post time: Jan-07-2025