Large diameter steel pipe can be used for straight seam pumping sand used, taking widely used in sand mining machinery, dredging, salt extraction, Chati iron, steel can be called pumping sand , sand pumping pipeline , pumping sand with steel.

Purchasing this industry should be relatively rich, but it is also very difficult to do. They also carry a lot of hardships. The materials that come out of the project also have many things that they have never seen before. They also have to study and study. Sewage steel pipe purchase should pay attention to the points.

Technical requirements and quality inspection of straight seam pipe According to the standard of GB3092 "welded steel pipe for low pressure fluid transportation", the nominal diameter of welded pipe is 6~150mm, the nominal wall thickness is 2.0~6.0mm, and the length of welded pipe is usually 4~10m. It can be factory-made according to the length of fixed length or multiple length. The surface quality of steel pipe should be smooth, and there are no defects such as folding, cracking, delamination and lap welding.

Large-diameter straight seam steel pipes can be used as dredging pipes , which are mainly used to clean steel pipes conveying sediment, mud and other mixed debris.

What is a petroleum steel pipe? The petroleum steel pipe is a long steel with a hollow section and no joints around, and the petroleum cracking pipe is an economical section steel.

What are the precautions for using oil casings? The oil casing is used to support the oil and gas well walls to ensure the normal operation of the entire well after the drilling process is completed. Each well is based on different depths of drilling and geology, using several layers of casing. After the casing is down, the cement is to be cemented. It is different from the oil pipe and the drill pipe and cannot be reused. It is a disposable material.

The history of oil casing development. After nearly 20 years of hard work, China's oil casing production has gone from scratch, from low price to high price, from low steel grade to API series products to special demand non-API products, from quantity to quality are close The level of foreign oil casing products. The domestic market share of China's oil well pipes has exceeded 80%, and has been a net export product for many years.

What is the type of line pipe tempering? According to the performance requirements of pipeline steel pipes, depending on the tempering temperature, tempering can be divided into the following types:

Structural performance comparison of seamless steel tubes. Carbon structural steel pipe: This kind of structural steel pipe is generally smelted by converter or open hearth furnace. Its main raw material is molten iron and scrap steel. The content of sulfur and phosphorus in steel is higher than that of high quality carbon structural steel pipe. Generally, sulfur is ≤0.050% and phosphorus is ≤0.045%.

The application of galvanized flat steel has also expanded correspondingly with the development of industry and agriculture. Therefore, the enterprises engaged in the production of galvanized flat steel in China are also required to have higher requirements for the galvanized flat steel. It is also because of the high new reference price of galvanized flat steel, so the production and process requirements are also very high, so the application range and type of flat steel is also very rich. So what is the difference between galvanized flat steel and round steel?

The main difference between different hot-dip galvanizing methods is how to activate the surface of the tube after acid leaching to improve the quality of galvanizing. Dry and redox methods are mainly used in production, and their characteristics are shown in the table. Galvanized steel pipes can be classified into hot-dip galvanizing and electro-galvanizing. Hot-dip galvanizing includes wet, dry, lead-zinc and redox processes.

Ellipse area formula S = ∏ (pi) × a × b (where a, b are the long semi-axes of the ellipse and the length of the short semi-axis respectively). Then the volume V = [∏ (pi) × a × b - ∏ (pi) ) × (a-2) × (b-2)] * 1000 mass M = V * P (density, look up the table)

The difference between the manufacturing process of galvanized pipe and galvanized steel pipe: galvanized steel pipe and hot-dip galvanized square pipe are two categories of steel pipe. Zinc plating means that the surface of the steel pipe is galvanized, which may or may not be welded pipe.

The galvanized square tube belongs to the price transition period. The focus of the government regulation is still to adjust the surplus under the premise of steady growth. Therefore, in a relatively long period of time, most domestic industries are still destocking. Lord, during this period, spot pressure will still have a greater constraint on the rise in futures prices.

Hot rolled products are generally divided into two categories, one is hot rolled slabs and the other is hot rolled coil. Hot-rolled thick plate refers to aluminum alloy sheet with a thickness of not less than 6.0mm. The main varieties are hot-rolled sheet (H112), annealed sheet (0), quenched or quenched pre-stretched sheet, etc. Hot-rolled thick plates are usually used in hot rolling mills. It is produced by the block method. The typical process flow is: ingot (homogenization) → milling, milling edge - + heating + hot rolling shear interruption straightening.

Hot-rolled steel is a steel that has been heated and rolled at a high temperature. Its strength is not very high, but it is sufficient for our use. Its plasticity and weldability are good, so we use it more often; cold-rolled steel is ordinary hot rolling. Steel is strongly drawn beyond the steel in the strain hardening stage, its strength is high, but the toughness and weldability are poor, relatively hard and brittle!

　Steel heat treatment is a process that changes the structure and properties of solid steel materials through certain processes such as heating, heat preservation and cooling. Compared with other processing techniques, heat treatment generally does not change the shape of the workpiece and the overall chemical composition, but rather imparts or improves the performance of the workpiece by changing the microstructure inside the workpiece or changing the chemical composition of the surface of the workpiece. It is characterized by improved internal quality of the workpiece. Heat treatment is especially important for steel materials.

Through trial and error, flame retardant and antimony trioxide were selected as flame retardant formulations and blended with polyethylene pellets. Chongqing PE flame retardant must be divided into gas phase in polyethylene.

The hot-rolled precision welded pipe is made by continuous casting round billet or initial rolling slab, walking beam heating furnace, high-pressure water descaling and then entering the rough rolling unit. The roughed material is cut, tailed, and then entered into the finishing mill and controlled by a computer.

manufacturer introduced the surface treatment method of large-diameter hot-dip tube. 1. Cleaning: Clean the surface of the steel with solvents and emulsions to remove organics such as oil, grease, dust, and cleaners, but not the rust and scale of the steel surface. It can only play a complementary role in the production of corrosion protection.

What are the methods for calculating the parts of small-diameter seamless steel pipes ? (1) Primary production process of hot rolled seamless steel pipe (delta initial inspection process): Billet piercing and rolling heating preparation and inspection steel pipe sizing (reduction) heat treatment straightening finished pipe finishing inspection library