(1) Carbon steel seamless pipes should be carefully installed and carefully inspected to ensure the quality of pipes and pipes.

Straight seam steel pipe is the production of steel plate, and spiral welded pipe is hot-rolled coil production. The rolling process of the hot strip mill has a series of advantages, and has the ability to obtain the metallurgical technology of producing high quality pipeline steel.

Magnetic particle testing or penetrant penetration testing can effectively detect surface defects such as surface cracks, folds, heavy skins, hairline, and pinholes. For ferromagnetic materials, magnetic particle inspection methods should be given priority because of their high detection sensitivity; for non-ferromagnetic materials, such as stainless steel seamless tubes, permeation testing is used.

Cold-drawn pipe wall defects High-precision cold-drawn tube inner surface roughness Ra ≤ 0.8μm, precision can reach diameter size ~ H9 H10, only to ensure that the honed H7 ~ H8 hole size and RA ≤ 0.2μm internal surface roughness requirements. In addition to the precision of the honing machine, the surface quality of the cold drawn tube is another key point. The internal surface defects of the cold drawn tube are classified by actual measurement data from a domestic manufacturer. There are mainly three types of honing tube surface roughness.

Hydrostatic pressure test, widely used in daily use, hydrostatic test, small valves, pressure vessels, various metal and non-metallic pipe pressure and burst test; various oil tools hydraulic strength and sealing performance test; pressure test and calibration pressure Instrumentation; pressure and burst tests of fire-fighting equipment such as fire hoses and fire extinguishers.

To achieve the steel pipe manufacturing machine: 1600mt bending machine, multi-roll bending machine combined with specially designed equipment, welding equipment, internal and external girth welding, dimensioning machine, solution annealing furnace and a series of other related machinery are used to manufacture key applications Such as oil refining, fertilizers, liquefied natural gas terminal pipelines, multinational pipelines.

EFW welding, in this process, the metal is heated by one or several consumable electrodes and heated metal workpieces. The arc fully melts the metal and filler material without the need for pressurization to work with the filler metal parts. All from the electrode. The operation flow is as follows:

The greater the pressure of the conveying medium, the thicker the pipe thickness, and the generally higher pipe requirements.

The United Steel Corp (U.S. Steel) before the date announced that due to the president's promise to impose tariffs on foreign steel, the company is ready to start a Illinois steelmaking facilities, and a two seat idle in the blast furnace one.

Carbon seamless steel tube is generally in the automatic production of rolling pipe unit. The solid blank is inspected and removed from the surface defects, cut into the required length, in the tube end of the perforation end of the centering, and then sent to the heating in furnace, perforation in the punch.continue to rotate and move when perforation, in the role of the roll and the head, the tube gradually formed within the cavity, called the capillary. And then sent to the automatic rolling machine to continue rolling. And finally by the whole machine are the whole wall thickness, by sizing machine diameter, to specifications. The use of continuous rolling mill production of hot-rolled seamless steel pipe is a more advanced method.

The difference between the so-called stainless steel seamless steel tube and carbon steel seamless steel tube, mainly refers to the stainless steel and carbon steel in the design of the difference, that is, the design rules of these two kinds of steel is not common.

Carbon seamless steel tubes are mainly used for transporting high pressure oil and gas near the wellhead. As the corrosion of hydrogen sulfide becomes more and more serious, the development of sulfur-resistant seamless pipes is imminent, and the sulfur resistance is the key. The effect of Cu and Ni on the HIC resistance of the seamless steel pipe material and the S content in the steel were investigated. The influence of the addition of Cu and Ni on the HIC performance was also examined. Hydrogen bubbling sensitivity.

The main advantages of pipeline transportation can be summarized as follows: (1) Large volume. Oil pipelines can continue to complete delivery tasks. According to the size of its diameter, its annual traffic volume can reach several million tons to 10 million tons, even more than 100 million tons.

In February 20th, Korea asked for some rules in the anti-dumping investigation and countervailing duty (dual anti -) investigation carried out by the World Trade Organization (WTO) on the US's export products to Korea. According to a statement from the WTO released the same day, South Korea's request for consultations aimed at the U.S. Department of Commerce in the export to Korea part of the corrosion of steel products, cold-rolled steel, hot rolled steel plate and large transformer for "double reverse" in the process of investigation using "that was the fact that" rules for exports of dumping or subsidies behavior cognizance. The Korean side believes that the rule does not conform to the relevant regulations of the WTO.

According to the news agency quoted the Kazakhstan Kazakhstan Investment Development Department news, the OECD Council has approved the Kazakhstan to join the OECD (OECD) Committee for iron and steel. The news said that Kazakhstan had applied for more than 5 years to join the OECD's iron and steel Committee. In September 2017, the Secretariat of the Commission to Kazakhstan steel policy that after the proposed admission to the OECD Council and approved proposals in kazakhstan. Joining the iron and steel Commission will help haha grasp the development and response of the international steel market and help solve the problems related to the development of the world steel industry on the basis of equality. At present, the 35 member countries of the OECD control the output of 45% of the global steel and 75% of the export.

1. Compared with other conventional pipes, the supply of seamless steel pipes is lighter in raw materials, high in strength, well tolerated, able to withstand high internal pressures, sensitive to production, and can be used in messy or harsh geological conditions.

Tubular steel structures are the best alternative to conventional structures for their practicality and good performance. Obviously, due to the cross-sectional profile of the tube, the weight may be reduced by many structural members.

Resistance welding (ERW) is a low-cost, high-efficiency pipe manufacturing technology that produces various steel pipes called ERW steel pipes. ERW welded pipe is welded with steel or steel strip and then welded with high frequency resistance welding. Straight seam welded pipes are widely used in oil and gas pipelines, oil well casings, coiled tubing and soil (such as scaffolding).

Straight seam steel pipe wall thickness control is a difficult production. At present, the methods adopted by vertical seam welded pipe manufacturers to improve wall thickness accuracy generally include: 1, tube heating Heat to the average to prevent a sharp rise in temperature above and below. Every time the take-off and landing temperature remains stable, the maximum lifting temperature does not exceed 30 degrees.

Make sure that the ERW pipe welds perfectly in the winter following the steps below: First of all, increase the welding current, reduce the welding speed, appropriately increase the cross-sectional area and length of the weld, and if necessary, warm up.

Seamless pipe quality requirements 1, chemical composition In order to improve the chemical composition of the steel and the uniformity of the purity of the steel, reduce the non-metallic inclusions in the pipe and improve the distribution status, it is often used to increase the chemical composition of steel, such as tin, lead and lead. ". Equipment, even the use of electroslag furnace furnace remelting refining.