On the 12th, local time, the US Department of Commerce decided in the final judgment of the annual anti-dumping tariffs for oil-specific pipes to impose a 75.81% anti-dumping tariff on South Korean steel company Nexteel and 6.75% anti-dumping tariffs on companies such as Worldsteel.

Spiral steel pipe should be tested before the factory mechanical properties and flattening test and flaring test, and meet the requirements of the standard requirements.

1. repair the mouth In order to ensure the welding quality, the welding is carried out before the complete inspection and correction, so that the pipe end, the oblique angle, the blunt edge and the roundness are in accordance with the interface size. When the individual steel pipe needs to be processed in the field, the gas welding is used and the slag is removed and the grinding wheel is reused with the grinding wheel. The operation procedure of the counter is to check the size of the interface connector, to clean the cavity, to determine and adjust the longitudinal joint of the staggered position of the steel tube, to the first pipe straight, to adjust the size of the gap between the counterpart, to the leveling mouth, to straight to straight, to the light point welding.

Why does oil drilling choose thick-walled seamless steel tubes?

Process equipment distinction: cold drawn seamless steel pipe is usually 0.5 ~ 100T single-chain or double-chain cold drawn machine. Finished seamless steel tubes are usually carried out on a two-roll mill where the steel pipe is rolled in a ring-shaped bore formed by a variable cross-section round hole and a stationary tapered head.

For the ASTM standard, the mechanical properties, chemical composition and metallurgical properties of different steels are different. There is a list of ASTM standards for different steel grades.

The non standard steel pipe is a kind of steel pipe which is compared with the national standard for the seamless steel pipe except the state standard. In the production of seamless steel pipe, the thickness of the wall thickness is classified according to the national conventional requirements and the thickness of the wall is classified, and it is allowed to have certain errors, which belongs to the national standard. In practical use, the national standard often has some limitations, which corresponds to the appearance of non-standard seamless steel tubes. The specifications of non-standard steel pipes complement the standard standard seamless steel pipe production, not that the quality of seamless steel pipe is compared to the national standard.

Black erw steel pipe is hot-rolled coil through the molding machine, the use of high-frequency current skin effect and proximity effects, so that the edge of the tube heating and melting, in the role of squeeze roller pressure welding to achieve production.

Introduction of welded pipe welding of submerged arc welding: 1, bubbles occur in the middle of the weld, the main reason is that hydrogen is still hidden in the weld metal in the form of bubbles, so eliminating the defects is the first step to remove the wire and weld corrosion, oil, moisture and humidity, followed by the need to dry the flux to remove water. In addition, increasing the current, reducing the welding speed and slowing down the melting speed of molten metal are also very effective.

The preweld quality of straight steel pipe includes weld quality and weld quality. (1) when the joint (i.e. the forming joint) has no wrong side or the wrong side is less than the specified value, the general error is less than or equal to 8%, and the maximum is not more than 1.5mm. (2) in order to ensure the suitable penetration depth and welding amount of the weld, it is necessary to ensure no cracking after welding, no burning phenomenon, and the height of the weld. There is no effect on the weld seam height. (3) continuous weld and good shape to ensure the final external welding quality. (4) there are no defects such as welding deviation, blowhole, crack, slag, welding and backing welding. The weld center deviation is less than 1mm. (5) no electric arc burns, little splash, no influence on pipe end groove and surface quality. (6) the weld metal is matched with the base metal, and the physical and chemical properties of the weld metal conform to the quality requirements.

Straight seam steel pipe fracture, hydraulic (pneumatic) parts in the design of the use of mechanical properties, brittle fracture is also related to the use of components temperature.

(1) the forming process of high frequency longitudinal welded pipe has little springback and little residual stress.

Pipes, pipes, connectors and valves with pipes are connected to the device for transporting gas, liquid or solid particles in the fluid. Typically, the fluid after the blower, compressor, pump, and boiler comes from pressure flow at high pressure in the pipeline, and can also be supplied by fluid pressure or gravity. The pipeline is widely used, mainly for water supply and drainage, heating, gas supply, oil and gas long-distance transportation, agricultural irrigation, water conservancy projects and various industrial equipment.

If you ask who is the best steel pipeline manufacturers in China, there is no doubt that it is United Steel Industry GROUP. As one of the largest manufacturers and exporters of steel pipe in China,We offer you the best steel pipes,such as Carbon steel pipe,seamless steel pipe,stainless steel pipe,welded pipe,ERW,SSAW,LSAW and pipe fittings. USI GROUP ​

After high-frequency straight welded pipe welding, heat treatment is a new technology to eliminate residual stress. Prior to welding, the material is preheated to post-heat treatment temperature and continuously heated during the welding process to maintain the temperature. After welding is completed, heat with a cotton wool and cool slowly. This method can effectively reduce the welding residual stress and improve the metal's resistance to stress corrosion.

(1) the forming process of HF longitudinal welded pipe is less springback and less residual stress. (2) the effect of deformation hardening is small, and the accuracy of the whole circle after geometric standard is conducive to ensuring the quality of construction and welding. (3) the weld shape of HF longitudinal welded pipe is good, and it is not easy to generate undercut, and the surface weld is not medium defect. (4) the high frequency longitudinal welded pipe is distributed at a point of the circumference. Therefore, it can be carried out in a favorable position according to the requirements of the weld.

Because long-distance natural gas pipelines have long distances and complicated geographical environments, there are many factors that affect the normal operation of pipelines, but the most important factors can be divided into the external environment and the quality of the pipeline itself. The quality of steel pipes is the most important factor affecting the quality of steel pipes, and the main aspects of the quality of steel pipes include the manufacturing process of high-quality steel pipes using steel pipes and steel pipes.

The wrong side of the high frequency longitudinal welded pipe is the most common problem of pre welding. The wrong side of the oversize will directly lead to the deterioration of the steel or scrap. Therefore, pre welding requires strict control of the wrong amount. Generally speaking, when the whole root or half of the tube billet is wrong, it is due to: 1, the slit adjustment is not in place (seams); 2, the adjustment of the joint roller is not in place (the angle of the roller is not right, or the center line of the tube is the axis, the left and right pressure rolls are asymmetrical, or the radial extension of the relative pressure roller is not consistent), and the pressure free round is not. 3, the pre bending is not pre bending, and there is a straight edge phenomenon.

The fracture of high frequency longitudinal welded steel pipe, hydraulic (pneumatic) components are used to design mechanical properties, brittle fracture and the use of temperature dependent components.

Petroleum is the most important energy in the world today. It is widely used. Many devices need to use oil to run normally. For example, we often use cars, planes, generators, etc. If there is no oil, then our life will be a very big change. So now, oil drilling is ongoing. During the period of oil drilling, thick walled seamless steel tubes with this material are widely used. Many people may be more puzzled. Thick walled seamless steel tube is hollow, and its strength should be very small, rather than using solid steel columns.   Indeed, the steel tube column is thicker than the thick wall seamless steel tube, and its strength is much higher. But the strength of thick walled seamless steel tube is still very strong. The most important thing is that it has great advantage, that is, its vibration is very small. After all, thick wall seamless steel pipe is hollow, when drilling, it can be good transmission of impact force, make the bit stable, suitable for oil drilling, is the best choice.

Oil Country Tubular Goods are used both onshore and offshore. In the industry, they are also referred to by the acronym OCTG (for “Oil Country Tubular Goods”). Each wellbore proceeds in multiple phases, during which drill pipe,casing (lines the wellbore), andtubing (delivery or production tubes that transport the oil and gas to the surface) are used alternately. With voestalpine Tubulars GmbH & Co KG, DMH United Steel Industry has an experienced and reputable OCTG manufacturer in USI Group. The company, which is based in Suzhou, china, is a world leader in high-strength, seamless Oil Country Tubular Goods. Individ