Straight seam steel pipe standard: (GB/T3091-2008) This standard includes straight seam steel pipe high frequency resistance welding (ERW straight seam steel pipe),

First clean the oil, paint, water, rust, etc. of the weld, and then open the groove according to the wall thickness, the thicker will open larger, the thin will open smaller (angle grinder) Then there is the gap of the product, usually 1-1.5 times the diameter of the electrode or wire. If you accidentally open the groove, you can leave it smaller. Point welding is at least three points, generally four points are better. When welding, it should be welded in half and half, and the starting point should be better than about one centimeter of the bottom point, so that the joint is good from the opposite side. If the wall thickness is thick, it should be layered, at least two layers, and the second layer can be welded after the first layer is completely welded.

When the pipeline is initially laid, people may consider the terrain, or the direction of the pipeline. But again, in the process of using the pipeline, one of the most worrying things for people today is the leak. If there is a leak, it will bring a lot of problems. In order to solve this problem well, there is now a seamless steel pipe that allows people to worry about it anymore.

This week, the national galvanized pipe market is weakly consolidated, ranging from RMB 20-120/ton.

What are the main uses and advantages of hot-dip galvanized pipe? In order to improve the corrosion resistance of steel pipes, general steel pipes are galvanized. Most of the old houses use hot-dip galvanized pipes. Now the iron pipes for gas and heating are also hot-dip galvanized pipes, and hot-dip galvanized pipes are used as water pipes.

After using galvanized steel pipe, the life and use of the product can be guaranteed. One of the main things that is talked about today is to explain the storage method of galvanized steel pipe, and know that these storage methods will not cause any problems when they are used.

The carbon steel pipe is made of a steel ingot or a solid round steel through a perforation, and then is formed by hot rolling, cold rolling or cold drawing. Carbon steel pipe plays an important role in China's steel pipe industry.

The continuous casting process includes horizontal continuous casting and curved continuous casting, solid continuous casting and hollow continuous casting. The application of the continuous casting blank simplifies the feeding condition of the extrusion, reduces the processing cost of the extruded bad material, and realizes the "short process" of the extrusion process .

After the stainless steel tube cold billet is heated, there is generally a temperature difference between the radial direction and the axial direction.

　The domestic steel market has been in a price increase situation due to various factors, and its price is likely to continue to rise due to domestic environmental protection.

A105 is the American ASTM standard number, and A stands for ordinary carbon structural steel. Standard name: Carbon steel forgings for pipe parts. Because this standard only specifies a carbon steel forging, A105 is also a forging carbon steel grade.

1. Carbon seamless steel pipe quality inspection and acceptance by the supplier technical quality supervision department 2. The supplier must ensure that the delivery of steel pipe in accordance with the provisions of the corresponding product standards. The purchaser shall have the right to inspect and inspect the product according to the relevant product standards 3. Carbon seamless steel pipe should be submitted in bulk acceptance, the group approved the rules should be consistent with the provisions of the corresponding product standards. 4. Carbon seamless steel pipe inspection items, sampling number, sampling sites and test methods, according to the provisions of the corresponding product standards. The consent of the demand side, hot-rolled seamless steel tube can be sampled by rolling the root array. 5. Carbon seamless steel pipe test results, a non-compliance with product standards, should be unqualified singled out, and from the same batch of steel pipe, either take double the number of samples for failure of the project re-test .

According to Indonesia, "Jakarta post" reported on February 8th, the Indonesian iron and Steel Association released data show that in 2017 Indonesia imported 6 million 430 thousand tons of steel, accounting for 48% of the total annual steel consumption in 2015 and 2016, respectively; Indonesia imported steel 6 million 850 thousand tons and 6 million 490 thousand tons, is the world's five largest importer of iron and steel.

The difference between stainless steel thick-walled seamless tubes and carbon seamless steel tubes mainly refers to the difference in design rules between stainless steel and carbon steel, that is, the design rules of these two types of steel are not common. The differences are summarized as follows: Stainless steel design rules cannot be applied to carbon steel because there are three fundamental differences between stainless steel and carbon steel:

High-frequency welding machines can be used for the welding of metal pipes, such as: copper pipes, brass, brass and steel pipes, steel pipes and steel pipes, steel pipes, cast iron pipes, copper pipes, iron pipes, iron pipes, iron pipes, copper pipes, aluminum pipes ,Steel pipe, aluminum alloy, aluminum and aluminum alloy pipe butt welding, welding, welding, etc., welding metal pipe (silver welded ring recommended welding) advantages:`2

Large diameter straight seam steel pipe is widely used in aviation, aerospace, energy, electronics, automotive, light industry and other industrial sectors, and is an important welding process.

From a macro perspective, the Sino-US trade war has officially started, and the seamless stainless steel tube market has increased concerns about systemic risks, but the state may adopt internal stimulus measures for hedging trade war pressure; from the industrial level, as high temperature weather continues, the terminal Demand continued to weaken, supply remained at a relatively high level, supply and demand for seamless stainless steel pipes evolved toward marginal weakness, but inventory remained low, and the contradiction between supply and demand was not prominent. For the market outlook, we believe that the price of seamless stainless steel pipes may continue to oscillate.

　　China Broadcasting Network Beijing October 10 news The US Department of Commerce announced on the 7th to launch anti-dumping and countervailing duty investigations on seamless steel pipes imported from China. The previous day, the EU Council of Ministers decided on the 6th to impose a final anti-dumping duty of 17.7% to 39.2% on China's seamless steel pipes exported to Europe. Analysts believe that the US International Trade Commission will make a preliminary ruling around November 2, and once approved, China's seamless steel pipe may lose the world's largest export market. The United States once again set trade barriers to China. Where will the Sino-US trade dispute go? Mei Xinyu, an associate researcher at the Research Institute of the Ministry of Commerce, analyzed this.

　　With the advent of the era of global economy and the demand for high-quality seamless steel pipe products in the domestic market, promoting industrial technology upgrade has become an inevitable requirement of China's seamless steel pipe industry. In this context, some seamless steel pipe manufacturers have embarked on the road of transformation and upgrading. Among them, promoting the integration of seamless steel pipe industry and mobile Internet has become the hottest topic.

The development of seamless steel pipe industry is being further adjusted. As a seamless steel pipe is one of the most important types in the steel pipe industry. Many manufacturers are doing this industry, the competition is fierce, and it is also relatively hung. However, in recent years, the overcapacity and the stratum of the strip steel are undoubtedly a challenge for the seamless steel pipe industry, so that the seamless steel pipe industry can be better developed. In order to obtain a relatively good profit, the seamless steel pipe industry must constantly study supply and demand, and only when the supply and demand relationship is in a better state can it win profits. Another is the export work, to strengthen their own strength and ensure the quality of seamless steel pipes, so as to ensure the development and profitability of seamless steel pipe manufacturers.

China's seamless steel pipe exports in January-February were 13.17 million tons, down 25.7% year-on-year. The analysis believes that the reason for the decline in China's seamless steel pipe exports is that the expectation for the future domestic demand market continues to strengthen; second, the international market trade protectionism prevails and targets China. The Chinese government and large steel companies are consciously reducing conflicts by reducing exports. It is predicted that if this trend continues, China's seamless steel pipe exports will drop to around 80 million tons this year. From the numerical point of view, it will greatly alleviate the problem of oversupply in the world seamless steel pipe market.