Seamless Steel Pipe

　　The derusting methods for high pressure boiler tube: 　　Cleaning: In order to achieve the removal of oil, grease, dirt, organic lubricant and similar organic matter, we can use the solvent, emulsion to clean the surface of high pressure boiler tube. But it can not remove the surface rust in high-pressure boiler tube, oxide, welding etc, so it only in anti-corrosion production only as an auxiliary means. 　　Removed rust by tools: Mainly use the wire brush and other tools for surface grinding of high pressure boiler tube, it can remove loose or tilt of the oxide, rust, welding slag and so on. Manual tool derusting can reach Sa2 level, power tools derusting can reach Sa3 level, and if the surface of the high pressure boiler tube attached to a solid iron oxide, tool rust effect is not so good, it will not achieve the requirements of anti-corrosion construction of the anchor depth. 　　Pickling: General use of chemical and electrolysis two methods to do pickling treatment, pipeline corr...

　　The boiler tube is made by tube. Boiler tube operated under high temperature and high pressure conditions for long period, the material would be creep, plasticity and toughness would decrease, the original tissue changed, result in corrosion and so on. 　　Steel pipes for boilers should be: 　　1. sufficient lasting strength; 　　2. sufficient plastic deformation ability; 　　3. hot brittle; 　　4. high oxidation resistance, resistance to coal ash, resistance to natural gas corrosion at high temperatures, steam and stress corrosion; 　　5. good tissue stability and good process performance. 　　The steel for high-pressure boiler tube are carbon steel and pearlite, ferrite and austenitic stainless steel.

　　Production characteristics of high pressure boiler tube： 　　1. Tube. High surface quality requirements, the need for stripping, an amount of 5 mm strips, some plants take black grinding. 　　2. Tube cutting. Hard steel, the use of flame cutting or sawing. 　　3. Heating. Poor thermal conductivity, and therefore to control the furnace end temperature. The heating temperature is generally 1120 ~ 1180 ℃. 　　4. Rolling. Such steel is generally better performance perforation, deformation parameters can be selected carbon steel. 　　5. Rolling after heat treatment. Such pipe after rolling to normalizing and tempering. Air cooling after hot rolling and then take some factories in 730 ~ 740 ℃ tempering. 　　Higher steel tube geometry requirements in order to ensure a good counterpart welding, pipe length should be as long as possible, helps to reduce the number of welds. 　　 http://www.xysteelpipe.com/info/Production-characteristics-of-high-pressure-boiler-tube-1251-1.htm

　　It is important to know the quality of thing that you are going to purchase, here we are going to introduce some simple quality identification methods of SA 213 boiler tube. 　　First, low quality SA 213 boiler tube prone to fold. Folding is a variety of polylines formed by the surface of the SA 213 boiler tube, which often runs through the longitudinal direction of the entire product. The reason for the folding is due to the high efficiency of the poor manufacturers, the amount of pressure is too large, resulting in the ear, the next rolling to produce folding, folding products will crack after bending, SA 213 boiler tube strength decreased. 　　Second, poor quality SA 213 boiler tube surface prone to scarring. There are two reasons: 　　1. Poor SA 213 boiler tube material is not uniform, more impurities. 　　2. Poor quality manufacturers guide guide equipment simple, easy to sticky steel, these impurities are easy to produce scar after the bite roll. 　　Third, poor quality SA 213 ...

　　Small diameter high-pressure boiler tube surface defects that affect the quality, mainly due to waste generation. 　　Boiler pipes often in high temperature and high pressure work, pipe smoke and water at high temperature steam oxidation and corrosion effects will occur, thus requiring durable steel with high strength, high oxidation resistance, and good organizational stability, high pressure boiler tube in addition to chemical composition and mechanical properties, hydrostatic testing done by the root, to be flaring, flattening test. Steel to heat treatment delivery. In addition, the finished steel microstructure, grain size, there are certain requirements decarburization. 　　High-pressure boiler tubes are seamless steel pipe categories. Seamless same manufacturing method, but used in the manufacture of steel pipe, there are strict requirements. Often in high-pressure boiler tubes at high temperature and pressure conditions of use, the tube under the effect of high temperature gas...

    SMLS steel pipe is mainly used for petrochemical cracking pipe, boiler tube, pipe, automobile bearing, petroleum geology drill pipe, tractor, aviation and other precision structure pipe.     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.     http://www.xysteelpipe.com/info/Application-of-different-outer-diameter-SMLS-pipe-1038-1.htm

    The most common way to test the hardness of a SA 213 boiler tube is to use a rasp to wipe the edge of the workpiece and to scrape the depth of the surface to determine its hardness,whose method is not scientific. Hardness tester to test is extremely accurate, is a modern test hardness commonly used method. The most commonly used test method is rockwell hardness test. Rockwell hardness testing machine use diamond into the metal depth to determine the hardness of boiler tube, into the depth of the larger, the smaller the hardness. Diamond into the metal depth, can be pointed out from the pointer the correct number, the number is called rockwell hardness.     Forging     It is a hammer to make the metal into a certain shape <forming> method, when the SA 213 boiler tube heating to the forging temperature, you can engage in forging, bending, drawing, forming and other operations. Most high-pressure boiler tubes are heated to fresh cherry red when t...