steel tube

 　　In March 2021, Xinyue received an inquiry from a new customer. After communication and understanding, the customer was an Australian racing track manufacturer. The product required was galvanized rectangular pipe with the specification of 65mm * 65mm * 3mm * 6000mm, which was used for a local racing track project. Although galvanized rectangular tube was one of the advantage product of Xinyue, it had been successfully sold to all over the world for many times. However, due to the tight construction period of the project, the delivery date given by the customer was also very short, and it was clear that the next negotiation can be carried out only after satisfying this prerequisite. We understood the customer's demand, and promised the customer that our company had a professional steel base, so that we can fully met the customer's delivery demand. Our sales engineer submitted the supply plan to the customer on the same day, dispelling the customer's doubts about the deliv...

 　　On March 27, 2017, the inter-ministerial joint meeting of the iron and steel coal industry to resolve excess capacity and overcome difficulties in development work held a steel and iron reduction work conference in Beijing. The meeting requested the steel industry to carry out supply-side structural reforms, and put forward the goal of resolving 50 million tons of excess capacity in 2017. Overall, during the "13th Five-Year Plan" period, the steel industry has achieved remarkable results in controlling production capacity. 　　In 2020, my country has achieved major strategic results in the fight against the new crown pneumonia epidemic. In the second quarter of that year, my country's economy began to recover quickly and gradually returned to the pace of development before the epidemic. In particular, infrastructure investment greatly increased my country's crude steel consumption. That year, my country's crude steel output reached 1.065 billion tons, a year-on-y...

 　　The single-day decline was close to 7%, and the lowest fell to around 720 yuan/ton. The price of high-grade mineral powder in the spot market fell sharply, and the price of incoming card powder fell to around 1100 yuan/ton...the iron with the strongest gains in the first half of this year After entering the second half of the year, the price of ore continued to fall, and has now hit a new low in the past 14 months. 　　The sluggish performance of iron ore prices is mainly due to the steady progress in the reduction of crude steel output in the domestic steel industry. The shrinking of the steel supply side has effectively blocked the iron ore demand space, and the iron ore futures market is bearish. The spot market also started a "high diving" market, squeezing the "price bubble" that caused the irrational rise in iron ore prices in the first half of this year. 　　So, will the "falling" iron ore "slow down" the rise of steel prices in the peak se...

 　　Since September, the situation of the steel market has gradually become clear, and it has got rid of the influence of the downward pressure on the economy and the decline in real estate data in August, and the overall situation has shown a slight upward trend. Steel production continued to decline, and the construction industry demand, which was affected by factors such as the new crown pneumonia epidemic and flood conditions, gradually recovered, and demand began to show a seasonal rebound, creating a good operating environment for the steel market. On the whole, the fundamental operating logic of the steel market is still affected by the two-way effect of increased production cuts and the rebound in demand during the peak season. It is expected that the steel market may still form a mismatch between supply and demand during the year. 　　Production restriction policy has been stepped up, and output continues to decline 　　Due to the intensified implementation of the production re...

 　　API Round Thread 　　There are short round thread casing and the long round thread casing points. There are some advantages about round thread casing as follows: 　　1. Improve the abrasion caused by resistance when the thread tightening 　　2. Tighten the screw, the tooth tip provides a reasonable space for foreign particles and dirt 　　3. The circular arc tooth is not sensitive to local scratch or dent damage 　　Round thread due to its easy processing, good sealing performance and low price, is widely used in casing connection. In addition, it’s simple in site maintenance and use. In the test of different specifications of the round thread casing, use appropriate specifications of the thread gauge to test, when necessary carries on corresponding processing to the data. 　　Buttress Thread 　　In oil field tubing, buttress thread is a pipe thread form designed to provide a tight hydraulic seal. The thread form is similar to that of Acme thread the force is transmitted almost parallel to th...

 　　1) The influence of welding current on weld formation 　　Under certain other conditions, with the increase of arc welding current, the weld penetration depth and remaining height increase, and the penetration width increases slightly. The reasons are as follows: 　　1. As the arc welding current increases, the arc force acting on the weldment increases, the heat input of the arc butt weldment increases, and the position of the heat source moves down, which is beneficial to the conduction of heat to the molten pool and increases the penetration depth. The penetration depth is approximately proportional to the welding current, that is, the weld penetration depth H is approximately equal to Km×I, where Km is the penetration coefficient (the number of millimeters that the welding current increases by 100A causes the weld penetration to increase), which is related to the arc welding method , Wire diameter, current type, etc. 　　2. The melting speed of the core or wire of arc welding is p...

 　　The straight seam high frequency welded steel pipe (ERW welded pipe) has advanced forming technology, reliable quality, good welding position, stable welding parameters, fast welding speed and high output. The equipment and technology of the entire production line are at the current international first-class level. 　　The high frequency straight seam welded pipe mill is used to level the fixed strip after slitting line, and entry it to forming machine, bend to open pipe by roller, melt the strip edges through the high frequency current, squeeze and weld the pipe to be closed by squeeze roll. 　　Features: 　　(1) The springback and residual stress of the longitudinal high-frequency welded steel pipe are small during the forming process. 　　(2) The deformation and hardening effect is small, and the geometric dimensions are accurate after being rounded, which is beneficial to ensure the quality of construction and welding. 　　(3) Longitudinal high-frequency welded steel pipe has good wel...

 　　When transporting all kinds of pipes, you should make preparations for packaging in advance, and perform standardized operations for transportation and loading to avoid scratches on the pipes and bear unnecessary losses. 　　1. Choose suitable tools for loading and unloading 　　Most of the pipes are used in the construction and manufacturing industries. With the continuous improvement of industry standards, the requirements for pipes are gradually increasing. There are also some polished pipes that require special attention during loading and unloading. Generally, pipes are loaded and unloaded by hoisting methods. To prevent scratches, nylon belts or wire ropes with spacers should be used for hoisting. It is strictly forbidden that the wire ropes directly contact the pipes. 　　2. Stable loading and unloading 　　In the process of loading and unloading the truck, you should apply force steadily, and keep steady when lifting and lowering, and don't shake back and forth. Shaking from sid...

 　　LSAW steel pipe (Longitudinally Submerged Arc Welding is abbreviated as LSAW) is a professional expression term for straight seam submerged arc welded steel pipe. LSAW steel pipe is produced by using a single medium-thick plate as a raw material, pressing (rolling) the steel plate into a tube blank in a mold or forming machine, and using double-sided submerged arc welding and expanding the diameter. The finished product has a wide range of specifications, good toughness, plasticity, uniformity and compactness of the weld, and has the advantages of large pipe diameter, pipe wall thickness, high pressure resistance, low temperature resistance and corrosion resistance. When constructing high-strength, high-quality long-distance oil and gas pipelines, most of the steel pipes required are large-diameter thick-walled straight-seam submerged arc welded pipes. According to the API standard, in large oil and gas pipelines, when passing through Class 1 and Class 2 areas such as alpine are...

 　　What are the main factors that cause seamless steel pipe cracking? There are mainly the following points: 　　1. Raw material selection 　　In order to save costs, some seamless steel pipe manufacturers will use round steel produced by small steel plants for processing, but the round steel produced by these small steel plants will contain many impurities, bubbles, interlayers, pores, etc., which will easily cause cracks after post-processing. problem. 　　2. Inadequate heat treatment temperature control 　　Small manufacturers do not have professional production experience and technology. Workshop workers cannot guarantee whether the heat treatment of the steel pipe is in place based on the heating temperature and duration alone, and the heat treatment will change the mechanical properties of the steel pipe. However, general manufacturers do not have clear indicators for different steel grades, wall thicknesses, mechanical properties, etc., and no testing equipment to determine whether ...

 　　The surface problem of seamless steel pipes is the most common one in the process of purchasing seamless steel pipes by all customers. We often encounter customers who conflict with downstream customers due to the surface pits of seamless steel pipes, and even cause refunds. Many customers vowed to guarantee surface quality problems when signing orders with upstream manufacturers. However, after delivery, they found surface pits, pits and other problems, and at this time customers will be in distress. Today,Xinyue will provide You analyze what causes the pits on the surface of the seamless steel pipe. 　　1. Piercing equipment 　　Many manufacturers choose unreasonable equipment for the perforation furnace. The shorter perforation furnace prevents the round steel from being evenly heated, resulting in higher internal and external temperature deviations, affecting structural changes, and causing pitting and pits. Xinyue has a long perforated heating furnace. Due to its length, the ro...

 　　How much smoothness of the inner hole of the cold drawn seamless steel pipe can be achieved? This is mainly based on the customer's product requirements. In the field of hydraulic steel pipes, the inner hole smoothness of the cold drawn seamless pipe can reach Rz2.0mm/M. What aspects of the finish of the inner hole of the cold drawn seamless pipe are affected? 　　The main influencing factors of the inner hole finish of cold drawn seamless steel pipe: 　　1. Piercing 　　The perforation experience of the manufacturer is immature, the perforation temperature is uncontrollable, the perforation equipment is short, and the uneven heating of the round steel causes a large temperature deviation between the inside and outside of the steel pipe, forming pits, pits, and peeling, etc., and the finish is not good. Xinyue has an elongated perforation furnace, and the steel pipe is heated evenly. 　　2. Cold drawn mold 　　There are defects in the cold drawing mold itself, resulting in poor internal f...

 　　The basic situation of API standard tubing and casing thread connection: 　　The API standard threaded connection of tubing and casing in petroleum special pipes consists of two parts: pipe or male end and coupling or female end. Those with external threads are called pipes or male ends, and those with internal threads are called couplings or female ends. 　　The two male ends are connected by a coupling, which is a short tube with an outer diameter slightly larger than that of the pipe. Both ends have internal threads. All casing and line pipes with API threads and couplings are not thickened. 　　The tubing is not thickened or thickened on the outside. The inner diameter of the pipe end is approximately equal to the inner diameter of the pipe body, but the outer diameter of the thickened end is larger than that of the pipe body, and the two ends of the integral connecting tubing are thickened. 　　The API specification includes 4 kinds of threads, namely, line pipe thread, round threa...

 　　Generally, the deformation of welded parts does not need to be corrected. Only when the post-weld deformation exceeds the technical requirements, it needs to be corrected. The welding deformation is mainly caused by the shrinkage of the welded joint. The correction is actually to create a new deformation to offset the original deformation. The main methods are as follows: Mechanical method and heating method. 　　1. Mechanical correction method 　　Hand hammer forging: Use an iron hammer to strike the deformed welding workpiece. This is a relatively simple correction method. Generally, a horn is required to prevent damage to the workpiece. Rolling equipment is used to roll the weld seam and its surroundings of the thin weldment. To achieve the purpose of correction. For simple small and medium-sized welded parts, jacks (hydraulic pressure and screws) can be used for correction, for rigid and strong weldments, presses can be used for correction, and profiles can be corrected with spe...

 　　Precision stainless steel pipes are very characteristic in terms of model specifications and appearance performance. First of all, the thicker the wall of this type of stainless steel pipe, the higher the cost performance and practicability. The thinner the pipe wall, the higher the processing cost. In addition, the performance limitations of stainless steel pipes depend on the processing technology. Generally, the precision of seamless steel pipes is low, and the thickness of the pipe wall is uneven, the brightness of the inner and outer surfaces of the pipe is low, and the cost of sizing is relatively expensive. Pockmarks and black spots are easy to appear and are not easy to remove. In addition, the detection and reshaping of precision stainless steel pipes and thick-walled pipes must be processed offline. Therefore, stainless steel pipes show sufficient superiority in the field of high-pressure, high-strength mechanical structural materials. 　　There are about 45 types of hot...