Seamless Steel Pipe

    Cold-drawn precision steel pipe with internal and external wall without oxidation layer, to withstand high pressure without leakage, high precision, high finish, cold bending is not deformed, flared flat no cracks, the surface has been anti-rust treatment, etc., mainly for mechanical structure , Hydraulic equipment and automotive motorcycles pneumatic or hydraulic components, such as cylinders or cylinders.     The basic process of cold drawing is: hot-rolled capillary; capillary inspection, grinding; capillary pickling; after pickling pickling; cold drawn; fine pull straight before the line; pickling, lubrication; Processing;     Production need to pay attention to control:     1, Capillary     Capillary wall thickness to be uniform, less inside and outside the surface defects; to configure the external surface polishing and hole defect cleaning equipment.     2, Re-examination     Compared with ord...

    Generally, there are two processes of seamless steel pipe: hot rolling process and cold rolling process.     Hot rolled seamless steel pipes will be coated with oil after a rigorous quality control by staff, then followed by several cold experiments and perforation experiments. If the perforation is too large, it needs straightening correction. After straightening correction, then transmitted by the transmitting device to the testing machine for testing experiments. If everything is all right, hot rolled seamless steel pips will be labeled and placed to the warehouse according to their specifications.     The process of cold rolled seamless steel pipes is more complicated than hot rolled seamless steel pipes. The pipe must through a three-roll rolling first and then will be sized after extrusion. If there is no cracks, cut it by cutting machine and anneal it by acidic liquid pickling. If there is a lot of bubble during pickling, it means that the se...

    Boiler tube includes medium pressure boiler tube and high pressure boiler tube. It is usually made of seamless process and welded steel tube is not applicable.It has been widely used at heat exchanger pipe and tubing services, tube exchanger bundle, high pressure boiler, economizer, super heater, petrochemical industry pipes, etc.     Based on different working temperature, the medium or high pressure boiler pipe shall be used. Normally classified as below cases:     1. The operation temperature of general boiler pipe is lower than 450℃. The medium pressure boiler pipeline mainly adopts hot rolling process or cold drawing process.     2. High pressure boiler pipes are often used in high temperature and high pressure conditions. Under the action of high temperature flue gas and steam, the pipe will occur oxidation and corrosion. It is required high pressure boiler pipe that has high durable strength, high oxidation corrosion resistance an...

    With the improvement on technology of ERW steel pipe making and SMLS steel pipe production, we know the difference is narrow down. However, there is still detailed difference we should focus on when we purchase it.     Precision: ERW steel pipe has smaller deviation than seamless steel pipe in diameter and wall thickness in precision. Due to the rolling difference and pipe forming technology. Thus we should choose the steel pipe according the precision requirement.     Mechanical properties: Talking about the heating treatment, controlled rolling, we should figure out that welded steel pipe has advantages to achieve those demands during the production. For example, Longitudinal welded pipe’s elongation of 8% to 10% which is higher than the seamless pipe, mainly vertical welded pipe carbon ratio of about 1/2 of seamless steel pipe.     http://www.xysteelpipe.com/info/SMLS-steel-pipe-or-ERW-steel-pipe-970-1.htm

    General chemical heat treatment of erw casing, such as carburizing, carbonitriding, carbon and nitrogen boron infiltration, respectively, are additional single component, two components and three components of the multi-parameter heat treatment.     In recent years, but also the development of a number of new technology using the erw casing chemical heat treatment, such as vacuum chemical heat treatment, fluid bed chemical heat treatment, ion osmosis metal, ion implantation, laser surface alloying, etc., can improve the erw casing wear Loss of corrosion resistance and other performance. Rare earth in the application of chemical heat treatment (ie, with rare earth infiltration), can significantly improve the rate of seepage, shorten the treatment cycle, and can improve the wear resistance and corrosion resistance of the layer, which is a major feature of our country.     In addition, the erw casing solid solution chemical heat treatment is also a not...

    There is the process for roll grove for the making of steel pipe range from seamless steel pipe, ERW steel pipe, galvanized steel pipe and so on. As steel pipe supplier in China, Tianjin Xinyue Steel Group knows deeply that high quality roll grove would have important roll for best quality steel pipe.     In making process, Xinyue steel describes the preparation for the special tools used to steel pipe’s production process with the ring-type roll and the design of and process method for the groove cam template.     As we all know that“Rolling groove cracking” is the root cause of insufficient welding strength. Under this situation, this is no doubt that we would avoid this trouble as better as we can in order to have high quality steel pipe for customers. Thus we should figure out the working principle very clearly. Of course, the steel pipe’s structure should be known clearly too.     http://www.xysteelpipe.com/info/High-quality-roll-gr...

    Each kind of test measurement such as Technical Properties (Flattening Test, Bending Test, Blow Test, Impact Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test would be necessary for guarantee of the high quality of steel pipe like seamless steel pipe, galvanized steel pipe.     There are some characteristics for visual inspection of non-destructive testing:     1. Weld surface defects test: surface cracks would be the first step for check of the steel pipe and then the impermeability and weld quality of the leak.     2. Detailed exam for raw material for steel pipe’s production, such as the surface cracks, peeling, cables, scratches, dents, bumps, spots, corrosion and other defects.     3. Cavity detection. This test would carry out according to the engineering project’s demand and the engineer’s requirement.     4. Additional material inspection. Inspect the product for dust, foreign matter and other ...

    Large diameter steel pipe is the pipe material with outer diameter greater than 1000mm, steel ingot is made of perforated or solid billet through the capillary tube, and then hot rolled, cold-rolled or cold call is made.     Large diameter steel pipe is coated large diameter spiral welded pipe and high-frequency welded pipe made of plastic coating on the basis of the maximum diameter of the nozzle.     1200mm, can be coated with polyvinyl chloride according to different needs (PVC), polyethylene (PE), epoxy resin (EPOZY) and other various properties of plastic coating, good adhesion, corrosion resistance, can be resistant to acid , alkali and other chemical corrosion, non-toxic, does not rust, abrasion resistance, impact resistance, permeability, smooth pipe surface, do not adhere to any substance that can reduce transmission of resistance, increase traffic and transportation efficiency and reduce transport pressure loss. Coating solvent-free, no le...

    Welded pipe is the common pipe material in gas pipeline, greater than 426 mm in diameter (508 mm) or the welded pipe is generally referred to as the large diameter welded pipe, according to the welding as a way for tube, can be divided into spiral welded pipe and straight seam welded pipe.     Spiral welded pipe is the low carbon carbon structural steel and low alloy structural steel strip according to certain helix Angle (also called the molding Angle) rolled into a tube billet, then pipe seam welding made up, it can use a narrow strip in the production of large diameter steel pipe. Spiral welded pipe is mainly spiral submerged arc welding (SSAW), widely used in all kinds of gas pipeline construction in our country, its specification in diameter * wall thickness. Spiral welded pipe with one-side welding and double welding, tube welding shall ensure that the water pressure test, the tensile strength and cold bending properties of the weld in accordance with reg...

    Seamless Steel Pipe including ASTM A53, ASTM A106, ASTM A179, ASTM A192, ASTM A199, ASTM A210, ASTM A213, ASTM A333, ASTM A334, ASTM A556 etc.     Standard: ASTM A53/A53M     Grade: GR.A, GR.B, GR.C     Application: Seamless Carbon steel pipe used for conveying water, petroleum, gas and other common fluid     Size(mm): OD10.3~1200 x WT1.0~150     Finish: Black and Hot-dipped Zinc-coated     Standard: ASTM A106/A53M/ASME SA106     Grade: GR.B, GR.C     Application: for High Temperature Service     Size(mm): OD10.3~1200 x WT1.0~150     Standard: ASTM A179/A53M/ASME SA179     Grade: Low Carbon Steel     Application: Seamless Cold drawn Low Carbon Steel for Heat Exchanger and Condenser Tubes     Size(mm): OD10.3~426 x WT1.0~36     Standard: ASTM A192/A192M/ASME SA192     Grade: Low Carbon Steel ...

    No matter which kind of steel pipe, from seamless steel pipe, ERW steel pipe to galvanized steel pipe, from Tianjin Xinyue Steel Group, you can see that we have description for testing methods. Today, we would like to have a detailed introduction for NDT testing.     There are various testing methods from physical to chemical, such as chemical component analysis, mechanical properties (Ultimate tensile strength, Yield strength, Elongation), X-ray Test and so on. Non-destructive testing for steel pipe means that this kind of testing method would not damage or have influence for the performance of the steel pipe. Of course, there is no harm for steel pipe too as it would not change the internal structure of the material abnormalities or defects, the use of heat, sound, light, electricity.     Through the methods of physical methods, the use of modern technology and magnetic, with the use of heat, sound, light, we can have a basic checking for the stee...

    The grain size control of high strength seamless steel pipe in the heat treatment process is very necessary, it has a very important effect on the quality of seamless steel pipe heat treatment. The following will be how to control the grain size are summarized below.     (1) Choose a reasonable heating temperature     Heating temperature is too low, the formation of high strength seamless steel pipe slow, or even not fully formed, unable to achieve the requirements of heat treatment. Heating temperature is too high, it is easy to get coarse austenite grains, resulting in reduced performance. Therefore, it should be based on the chemical composition of seamless steel tubes, the shape and size of parts, with or without special requirements, changes in cross-section and specific technical requirements and other aspects to a reasonable choice of heating temperature.     (2) To determine the reasonable and optimal holding time is designed to...

    1. The stacking principle requirements of SSAW steel pipe is stable and ensuring the safety, so we should stacking SSAW steel pipe according to specifications, different varieties, different materials, and different specifications SSAW steel pipe should be stacking respectively, to prevent muddy and mutual erosion.     2. SSAW steel pipe is prohibited in the steel pipe stacking around the location of the erosion of steel pipe objects.     3. SSAW steel pipe bottom should be high, strong, smooth, to prevent the material damp or deformation.     4. The same kind of material SSAW steel pipe should be stacking in accordance with the order of storage in order to facilitate the implementation of the principle of improving the predecessors.     5. If the SSAW steel pipe in the open space, must be under the spiral pipe to prevent the wooden mat or stone, etc., and the stack should be slightly inclined to facilitate drainage, and pay ...

    Spiral welded steel pipe welding area of ??the common defects are usually buried in the arc welding area prone to defects such as pores, hot cracks, and undercut.     1.bubble. Bubble occurred in the middle of the weld pipe of the welded steel pipe, the main reason is that hydrogen is still in the form of bubbles hidden in the weld metal inside, so the elimination of this defect is the first step must be removed welding wire and weld rust, oil, water And moisture and other substances, followed by the need to dry the flux to remove moisture. In addition, it is necessary to increase the current, reduce the welding speed and slow down the solidification rate of the molten metal. In addition to this defect, it is necessary to remove the rust, oil, moisture and moisture of the welding wire and weld, Heat the flux well to remove moisture. In addition, to increase the current, reduce the welding speed, slow down the melting rate of molten metal is also very effective....

    First, the magnetic test     The magnetic test is the simplest way to distinguish between annealed austenitic stainless steels and ferritic stainless steels. Austenitic stainless steel is non-magnetic steel, but after the cold under pressure will have a mild magnetic; and pure chrome steel and low alloy steel are strong magnetic steel. By testing the magnetic properties of steel pipe can be identified austenitic stainless steel pipe and ferritic stainless steel pipe.     Second, nitric acid point test     One of the salient features of stainless steel pipes is inherent corrosion resistance to concentrated nitric acid and dilute nitric acid. This performance makes it easy to distinguish from most other metals or alloys. But the high carbon type 420 and 440 steel in the nitric acid point test is slightly corroded, non-ferrous metals encountered concentrated nitric acid will be corroded immediately. And dilute nitric acid on the carbon ste...