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.

The quality control of Longitudinal welded pipe is to safely carry out production operations and is also an indispensable element for protecting the personal safety of operators. The main application areas are: large-span grid engineering, construction steel structure engineering, power and EHV transmission and transformation projects, mechanical engineering, bridges, bridges, stations, airports, stadium steel structure engineering, municipal pipe network, foundation piling, water gas pipelines , highway construction and other ancillary facilities.

2. The above price is based on EXW, for FOB/CIF/CFR price, please contact info@united-steel.com; 3. The above price is NOT including any packing and end processing charge; 4. The above price is only valide during March 9 - March 16 ; 5. The applicapable MOQ for this price list is over 25 tons;

The Wall Street Journal reported in a report on the 16 day of the Wall Street. Peter, director of the White House National Trade Commission, is closely related to the interests of the US iron and steel industry. He has instructed the Steel Corp to provide funds for filming documentary supporting his political views.

Seamlesstandard way of seamless steel pipe: 1. Wiring harness 2. Steel tape bundle Three steel tape ruled tapaten There is also an upgrade package: both ends of the tube (bundle) wrapped in PE film or film and tapaten. Seamless precision tube packaging

In order to detect transverse or longitudinal LSAW longitudinal joint welding flaws, ultrasonic testing is performed by a jet (water column) coupling. Ultrasonic flaw detection (water column) Ultrasonic flaw detection is a method in which the longitudinal beam transmitted between the probe and the pipe through the jet coupling probe enters the steel pipe through the water or steel interface, and is detected by the pure transverse wave of the weld of the waveform conversion pipe.

Post-weld heat treatment is a new process that eliminates residual stresses. Preheat the material to the post-weld heat treatment temperature, continue to maintain the heating temperature of the workpiece before welding, after insulation is completed, slowly cool it with insulation wool. The method can effectively reduce the welding residual stress and improve the stress corrosion resistance of the metal.

Seamless precision steel pipe is used in hydraulic & pneumatic cylinder ,automobile and other mechanical device .Feature: high precision and high brightness, the inner and outer surface of the tubes have high cleanness without oxid, mechanical properties of the final tubes also come out excellent, promising no leakage under high pressure, no deformation after cold-bent and no cracks when flaring and flattening, ensuring the efficient operation in all service.

DMH UNITED STEEL INDUSTRY CO.,LTD will show you "seamless steel pipe manufacturing process", and you will learn more about seamless pipes. Hot-rolled (extrusion seamless steel pipe): round tube perforation → heating → three-roll rolling, rolling or extrusion → detached → sizing (or reducing) → cooling → straightening → hydrostatic test (or testing) → mark → storage.

Large-diameter seamless steel pipe are those with an outer diameter exceeding 100 mm, wall thickness greater than 0.2, and the outer diameter of a pipe, and large-diameter seamless steel pipes are pierced with steel ingots or solid pipes, and then hot-rolled, cold-rolled, or cold dialed.

Steel imports in Latin America rose in 2017 and exports increased at the same time, according to the BNAmericas website.

According to UPI UPI website reported on February 18th, according to the survey report released 232 measures of steel and aluminum products and intends to take the South Korean President Wen zaiyin said on that day, the US trade protectionism measures firmly and resolutely deal with, or beauty related measures to resort to WTO, at the same time to assess whether the violation of the Korea US FTA this agreement, such problems in amending the bilateral trade agreement negotiations.