Seamless Steel Pipe

 Actually, steel pipe would have their lifespan so that we cannot hope that they can work for us once for good. They may die, means too rusty to put into use, whether SMLS steel pipe or LSAW, SSAW, ERW steel pipe if we don’t repair them or cure them when we figure out that they are ill(start to get cracks or rust). Rust would be one of the most common seen illness for steel pipe. First of all, we should figure out the etiological diagnosis for this ill. We know that steel would rust when they exposure to water, air, wet condition, etc. Under this situation, we should take different measures for different steel pipes when they transported to different environment for different purpose of usage. Then we should find the solution of cure the illness for them. The main use of wire brush and other tools on the polished steel surface, you can remove the loose or tilt the oxide skin, rust, welding slag and so on. For example, put a galvanized coating for steel pipe would be one of the way ...

 Small OD SMLS steel pipe is widely used for both side submerged arc welded manufacturing technology. Small OD SMLS steel pipe’s manufacturing process can be bending, internal welding, commissural, external welding, straightening, flat top multi-channel, etc, to achieve API standards. Large OD with thick wall can be used in all kinds of construction site and make the body supporting portion. For example bridge support, offshore piling, and other building pile.Also, it can also used for liquid transportation. Small OD SMLS steel pipe refer to the ratio of small diameter and wall thickness of the pipe. Tianjin Xinyue Steel Group’s production range is OD from 6mm to 914.4mm, WT from 0.5mm to 40mm. This production range includes both carbon steel and stainless steel. SMLS steel pipe is mainly used for petrochemical cracking tube, boiler tube, pipe and automotive bearings, petroleum geology drilling pipe, tractors, aviation and other precision structural tube. Tips: Carbon steel pipe we...

 Seamless steel pipe, from its spell, we can tell that it doesn’t have any weld seam. So it can bear high pressure or high temperature working condition. Forming process for seamless steel pipe can be casting or cold drawing. Precision steel pipe need more advanced technology, so it just been applied in recent years. Also from the spelling, we can see that there will be much less tolerance for precision steel pipe, this includes OD tolerance, WT tolerance, roundness tolerance, length tolerance, weight tolerance, etc. Cold drawn precision steel pipe features: 1. Complicated cross section. 2. Accurate precision and good surface quality. 3. MOQ is much less than normal carbon steel pipes. 4. OD will be smaller. Generally speaking, for small OD with strict tolerance range, it would be better if we choose to go by precision steel pipe, especially for industrial steel pipe or steel pipes used for machines. http://www.tjxysteel.com/news/Precision-Steel-Pipe-VS-Seamless-Steel-Pipe-172.html...

 Submerged arc welding technology is the welding process of SSAW steel pipe and LSAW steel pipe. During the welding process, in addition to insufficient penetration, burn-through and poor formation caused by improper welding process parameters, there will also be pores, slag inclusions, cracks, etc. Defects. This article mainly introduces the main reasons and preventive measures for porosity in submerged arc welding seams. (1) In the process of steel rolling or hot stamping and coiling, the oxide scale formed or fallen off, as well as the positioning welding slag shell, the carbon arc gas created flying slag, etc., are trapped in the flux, which will also cause pores in the weld. Preventive measures: ①The oxide skin that falls off during the process of coiling and bending should be cleaned or blown off with compressed air before assembly and welding to prevent it from being caught in the assembly gap or falling into the groove. ②The surrounding of the welding site should be clean t...

 Quality test for seamless steel pipe is a very important step for SMLS steel pipe quality control, and for its detection method is also a very particular method for three testing---Ultrasonic testing, Eddy current testing, Magnetic flux leakage testing. Today, we’ll talk about specific situation on non-destructive testing. NDT, short for non-destructive testing, is a widely used method for steel pipe inspection. It is a process of testing, evaluating and inspecting the characteristics and quality of the material without damaging steel pipe itself or affecting the later regular work of steel pipe. In other words, after NDT, steel pipe can still put into practical use. Most common seen NDT are Visual Testing(VT), Ultrasonic Testing(UT), Radio-graphic Testing(RT), Hydrostatic Testing(HT). Tianjin Xinyue Steel Group uses VT, UT, HT for all steel pipes. In order to verify the mechanical properties of seamless steel pipe to meet the requirement of the standard, test sample of SMLS steel...

Spiral steel pipe(ssaw) is a steel pipe with spiral seam, which is made of strip steel coil as raw material, often warmly extruded, and welded by automatic double-wire double-sided submerged arc welding process. It is mainly used in pipeline transportation of oil, natural gas, bridges, docks, roads, buildings and other projects. Welding is the most common connection method for steel pipes, so how are spiral steel pipes generally welded? Spiral steel pipe generally adopts advanced double-sided submerged arc welding process, which can realize welding in the best position, and is not prone to defects such as misalignment, welding deviation and incomplete penetration, and it is easy to control the welding quality. 1) The raw materials are strip coil, welding wire and flux. It has to undergo a rigorous physical and chemical inspection before it is put into use. 2) For the butt joint of the strip steel, single wire or double wire submerged arc welding is used, and active submerged arc weldin...

 Do you really know about the gap between high grade steel of domestic and abroad? In the field of marine engineering equipment and high-tech shipboard critical steel, China urgently needs to develop high-end varieties. At present, from the perspective of consumption, 90% of China's steel for marine equipment can be self-sufficient, but in terms of specifications, the steel used for high-end marine equipment, which accounts for 70% of the grade, is either blank or heavily dependent on imports. In aviation (aerospace) engines and high-temperature alloys for gas turbines, China is still in the follow-up phase. However, objectively speaking, the gap between the level of research and production of high-temperature alloys in China and the advanced countries is getting closer. In the new high-speed rail and urban rail steel, China's development is not balanced. At present, China's EMU vehicle technology is in a running or leading position worldwide, but the key materials in key t...

 In April, the scale of industrial added value rose slightly. Imports and exports picked up after removing seasonal influences, and investment in fixed assets continued to decline. Among them, the infrastructure and real estate investment that had the greatest impact on steel products fell, the growth rate of manufacturing investment rebounded, and consumption was lower than expected. There is a downturn and the pressure on the medium and long-term economic downturn is greater. Macroeconomics: Investment continued to decline, China and the United States did not have trade wars, and it was difficult to expand domestic demand. Supply and demand outlook: Production continues to increase, inventory decline slows down, demand downturn inflection confirmation. Rebar and hot coils are in a relatively large state of discount, the disk reflects the market's bearish expectations for the latter part of the period, the current price difference trend, we believe that the greater probability lie...

 In the future, the steel industry must focus on four major issues. First, the excessive growth of crude steel production will bring greater pressure on the market this year. In recent years, member iron and steel enterprises have achieved certain results in strengthening self-regulation, and advantageous companies have accumulated some experience in playing their role as market players. However, since the beginning of this year, the non-member company's steel production has increased significantly, which poses a large downward pressure on the market. The second is profit-driven capacity expansion. Some companies have violated the regulations or have come up with electric stoves. The re-emergence of “Grid Steel” and the problem of overcapacity have not yet been completely resolved. Third, the United States adopted trade protectionism measures and severely undermined the rules of the WTO, resulting in an increase in trade frictions between China and the United States. This made Chin...

 The problem of uneven wall thickness of large-diameter seamless steel pipes is relatively common in the production of seamless steel pipes, and it is also a headache for customers. The unevenness of the thick-walled seamless steel pipe is mainly reflected in the uneven spiral wall, the uneven linear wall thickness, and the thickness of the head and tail is slightly thicker and thinner. The reason for the unevenness of the large-diameter seamless steel pipe is the inclination of the center line of the cold rolling of the cutting machine, the different inclination angles of the two hot-rolled strips, or the unevenness of the wall thickness caused by the adjustment reasons such as the small amount of reduction in the front of the top. The entire length of the tube is spiraled throughout. An important preventive measure is to adjust the cold rolling center line of the cutting machine so that the inclination angles of the two hot-rolled strips are the same, and adjust the cold drawing ...