LSAW Steel Pipe

　　Heavy-weight drill pipe is made from AISI 4145H steel, after all the heat treatment of materials, all physical properties comply with recent provisions of API specification 7. Integral heavy weight drill pipe is a common transition between the drill pipe and drill collars of the drill, which can effectively alleviate the drill collars and transition in the combined stress concentration provides drilling, and can effectively reduce the drill and the wear rate of the connection area and diameter of the borehole. Drill pipe in central part of the thickened, welding joints and thickened in the middle part of the appearance of cemented carbide wear, can effectively protect the pipe from wear and tear. In a soft case of geological formations, heavy weight drill pipe can replace the drill collar to solve a series of problems occurred in vertical drilling. Here are some characteristics and advantages of heavy-weight drill pipe: 　　1. Extra length of tool joints provides plenty of space to o...

　　ERW pipes means Electric Resistance Welded Pipes. ERW steel pipes and tubes are used in various engineering purposes, fencing, scaffolding, line pipes etc. ERW steel pipes and tube are available in various qualities, wall thicknesses, and diameters of the finished pipes. 　　1. Yield strength of the N80 is higher than the J55 up to 173 ~ 206 MPa. 　　2. On the same area of ??the sample, the elongation of N80 is higher than J55. 　　3. Under the same size, the same sample orientation, the same minimum sample size, J55 grade couplings, coupling stock, coupling material, semi-finished and coupling attachment material can absorb lower than N80 steel grade. 　　4. The nondestructive testing methods of seamless pipe,coupling stock, welded tube with J55 and N80 is differeent. 　　5. J55 and N80 steel grade is not the same color: length greater than or equal 1.8m, J55 painted a bright green, N80 painted a red; 　　6. J55 chosen by the manufacturer, or organize according to the order specifi...

　　The hardness of carbon steel pipe commonly used Brinell, Rockwell, Vickers hardness of three kinds of indicators to measure. 　　Brinell hardness 　　In the steel standard, it is the most widely Brinell hardness, often expressed in the indentation hardness of the material in diameter, both intuitive and convenient. However, for a hard steel or steel thin NA. 　 　Rockwell hardness 　　Rockwell hardness test tube with Brinell hardness test, as are the indentation test methods. The difference is that it is a measure of the indentation depth. Steel Rockwell hardness test is a very wide application, wherein after the Brinell hardness HB HRC use in steel standard. Rockwell applicable to the determination by the extremely soft to extremely hard metal materials, which make up not Brinell method, compared with Brinell method is simple and can be read directly from the dial hardness machine hardness value. However, because of its small indentation, the Brinell hardness values better method i...

　　 Stainless steel pipes are used in a wide range of industries/markets, due to their overall corrosion resistance and good machinability. Pipes are generally considered passageways for liquids, and measured by inside diameter or ID. Some industry examples include marine, chemical & petrochemical, oil & gas, and renewable energy. Here are some test methods for identifying stainless steel pipe: 　　First, the magnetic test 　　The magnetic test is the simplest way to distinguish between annealed austenitic stainless steel and ferritic stainless steel. Austenitic stainless steel is non-magnetic steel, but by the cold down after cold processing will have a mild magnetic; and pure chrome steel and low alloy steel are strong magnetic steel. 　　Second, nitric acid point test 　　One of the salient features of stainless steel welded pipes is the inherent corrosion resistance of concentrated nitric acid and dilute nitric acid. This performance makes it easy to distinguish from most o...

　　According to the different process requirements, steel pipe length measurement system has following methods. 　 　1, The grating length measurement 　　The basic principle is: the outer ends are provided two fixed length steel grating, utilizing rodless cylinder near both ends of the steel grating drive, using light interference realize the measurement of the length of the pipe. It is characterized by high accuracy. But the scale is expensive and difficult to maintain, the impact of dust and vibration are sensitive site. 　　 2, The camera length measurement. 　　Camera length measurement is the use of image processing to achieve pipe length measurement, the principle is equidistant installed in a section of pipe on the roller conveyor series of photoelectric switches, plus light source and the camera in the other section. When the pipe through the region, can be determined by the camera intake pipe length image on the screen at the position according to a photoelectric switch. Fea...

　　42CrMo seamless steel pipe is a super high strength steel with high strength, toughness and good hardenability. 　　42CrMo Seamless Steel pipe Uses: Bridges, Automobiles, Pressure Vessels. This kind of steel relies on adjusting the carbon content to improve its mechanical properties. Therefore, according to the carbon content, this kind of steel can be divided into: low carbon steel - carbon content is generally less than 0.25%, such as 10, 20 steel, medium carbon steel - carbon content is generally between 0.25% and 0.60%, such as 35, 45 steel, etc., and high carbon steel - carbon content is generally more than 0.60%. This kind of steel is generally not used to manufacture steel pipes. 　　No obvious tempering brittleness, small deformation during quenching, high fatigue limit and multiple impact resistance after quenching and tempering, good impact toughness at low temperature, high creep strength and endurance strength at high temperature. 　　Process specification 　　Heating 　...

　　 Galvanized pipe coating process 　　A continuous galvanized pipe coating production technology and equipment, and the process includes the following steps: passivation, cleaning; paint; curing, with drying preheating before coating, and the drying preheating temperature is about ±20 ℃ of the curing temperature. The device is based on the known device, before the dip-coating slot with drying preheating furnace. The process and equipment can not only in bulk for continuous galvanized pipe paint production, but also ensure the quality of paint, the surface no bubbles, no orange peel, efficiency can be improved twenty or thirty times. 　　Hot dip galvanizing production difficulty is steel leakage defect, zinc layer falls off and edge thick. 　 　1. Steel leakage defect 　　In order to reduce cost and increase the strength of steel, much more silicon are often be added to the steel base. The exceeded silicon can increase the surface tension, reduce the steel plate to the zinc liquid wet...