ERW Steel Pipe

　　 Weld pipe weld porosity affects not only the pipeline denseness, resulting pipeline leakage and corrosion will be induced point seriously reduce the weld strength and toughness. Factors weld porosity are: the flux in the water, dirt, oxide and iron filings, welding ingredients and cover thickness, surface quality steel and steel side plates processing, welding technology and steel molding processes. 　　Related prevention measures: 　　1. Flux ingredients. CaF2 and SiO2 containing an appropriate amount of welding, the reaction will absorb large amounts of H2, generating a high stability of the HF insoluble in the liquid metal, thereby preventing the formation of hydrogen gas holes. 　　2. The bulk thickness of the flux is generally 25-45mm, large solder particle size, bulk density hour take the maximum thickness, whereas the minimum value; high current, low welding speed accumulation take the maximum thickness, whereas the minimum value addition, summer or air humidity, flux recove...

　　How to control defects in seamless steel tubes： 　　1. Blowing process 　　1) The injection pressure should be matched with the diameter and length of the capillary tube, to ensure that the blowing is strong and the combustion is sufficient, and that the incompletely combusted deoxidant cannot be blown away from the capillary tube by the airflow. 　　2) The purging time should be adjusted according to the direct and length of the capillary, with the standard that no metal oxide suspended in the capillary is blown out again. 　　3) The nozzle height should be adjusted according to the capillary diameter to ensure good alignment. The nozzles should be cleaned once every shift, and the nozzles should be removed for cleaning after a long stop. In order to ensure that the deoxidizing agent is uniformly blown on the inner wall of the capillary tube, an optional device is used at the spraying deoxidizing agent station, and is equipped with a rotary air pressure. 　　2. Deoxidizer 　　Thoriu...

　　When choosing a straight seam steel pipe , we must first pay attention to the material. When we inspect the goods, we must first determine whether the material is qualified. The second is to see if the wall thickness of the straight seam steel pipe reaches the required wall thickness. Whether the tolerance is within the national requirements. Thirdly, it depends on the surface of the steel pipe, whether there is rust and the degree of rust. Generally yellow rust is no problem. Generally yellow rust is a layer of floating rust, and the red rust is slightly more serious, but it can also be used in some less strict projects after annealing. Use, but if it is black rust, it means that this pipe can only sell scrap iron. 　　Also, we need to see if there is oil on the surface of the steel pipe, because the straight seam steel pipe may be stained with oil on the unit during the production process. Finally, we need to see whether the cross-section of the two ends of the pipe is round or has...

　　First of all, let's take a look at some of the mechanical properties of steel products made of HPB300. The yield strength standard stipulates that it is not less than 300MPa. The tensile strength standard specifies not less than 420MPa. These two main steel product parameters are higher than q235 steel products. From the perspective of chemical composition quality, the chemical composition quality of the two is basically the same. HPB300-C content is 0.25. The Si content is 0.55. The Mn content is 1.5. 　　From the material name point of view, q235 steel only indicates the yield strength value indicated by "q". The HPB300 appears to be standardized. 　　Let's take a look at the characteristics of high-quality seamless steel tubes . The long, high-quality seamless pipe refers to a large-caliber seamless steel pipe. The seamless steel pipes we provide are structural stainless steel seamless steel pipes that comply with (GB / T14975-1994) standards and are widely used ...

　　China is still in the state of a developing country. Compared with a developed country and a developed country, the most obvious difference is the use of steel. There are many steels today, and steel is also used to make many things. 　　304 stainless steel thick-walled pipes are more popular in the market now. The material of 304 stainless steel thick-walled pipes is more special. The first advantage is environmental protection, and the second is high cost performance. In fact, for 304 stainless steel thick-walled pipes, high cost performance and good performance are the biggest advantages, so consumers now also need to use 304 stainless steel thick-walled pipes. 　　Where the mediums such as oil and natural gas are commonly transported in life, we can all see the application of 304 stainless steel thick-walled pipes. The properties of 304 stainless steel thick-walled pipes are specifically targeted at these media. The use effect is very good and the practicality is very high. A mor...

　　Low carbon steel pipe 　　Low carbon steel means that carbon content is from 0.10 to 0.30% low carbon steel easily accepted by various processing such as forging, welding and cutting, commonly used in the manufacturing chain, rivets, bolts, shafts, etc.. the finished product is low carbon steel pipe . It includes the most ordinary carbon structural steel, and part of high-quality carbon structural steel, mostly without heat treatment for engineering structural components, some by carburizing and heat treatment for the requirements of wear of mechanical parts. 　　Low-carbon steel is generally rolled into angles, channels, beams, steel pipes, steel strip or sheet steel for the production of various building components, container, box, furnace and farm machinery. The high-quality low-carbon steel is rolled into sheets, making the the cab car hood deep drawing products; rolled into bars for less demanding mechanical parts production strength. Low carbon steel is generally not by heat tr...

　　Large-diameter spiral steel pipe is that spiral pipe?that use steel strip coil as raw material, often warm extrusion molding, two-wire double-sided submerged arc welding(dsaw) process automatically welded. raw material is strip volume, wire, flux. The input to go through need rigorous physical and chemical testing. Strip head and tail docking, using a single wire or twin-wire submerged arc welding and automatic submerged arc welding rolled into the steel pipe. Prior to molding, strip is through flattening, cutting, trimming, edge planing, transportation and to the curved side surface cleaning. Electric contact pressure gauge to control the conveyor on both sides of pressing cylinder pressure to ensure the smooth delivery of the strip. The external control or internal control roll forming. Weld gap control device to meet the welding requirements ensure that the weld gap, diameter, misalignment and weld gap have been strictly controlled. Within the weld and outside welding Lincoln wel...