LSAW Steel Pipe

    Piercing tool of seamless steel pipe is following below:     1) Roller: It is the main drive deformation tool. Usually the roller is composed of inlet cone, rolled belt (also called compression belt) and outlet cone. Its function:     a. Inlet cone: Into the tube blank and achieve tube perforation.     b. The exit cone is to achieve hair wall reduction, levelling of the capillary surface, uniform capillary wall thickness and complete capillary return.     c. Rolling belt: play a transition from the inlet cone to the exit cone.     2) Guide: It is a fixed external deformation tool, not only plays the guiding role of the tube blank and the capillary tube, making the rolling line stable, but more important is the closed hole outer ring, limiting the lateral deformation of the capillary tube - expanding diameter, play a role in controlling the diameter of the outer diameter of the capillary tube. The guide plate has t...

    UT, which is short for Ultrasonic Test, is widely used for testing finished steel pipe. We all know that UT test is a must in steel pipe industry, but do you know what are the advantages of UT test? In the article, we will introduce the advantages of UT test.     Ultrasonic testing has lots of advantages in the application of pipeline inspection:     Non-destructiveness is the most important advantage. On the one hand, the inspected steel pipe doesn’t need to be cut or exposed to damaging chemicals component, which means the inspection won’t have any influence on its future usage. On the other hand, it does no harm to operators, leaving no potential risk for operators. It is both safe for the pipes and operators.     Strong penetrating power makes sure it has a wide detection range. Any defects can be detected. It is useful and efficient for steel pipe inspection.     High sensitivity features allow it to precisely and quickl...

    ERW steel pipe, which is short for electric resistance welded steel pipe, is widely used for low pressure liquid delivery, such as water, gas and oil field, oil drilling and machinery manufacturing, etc.     Today, we’ll talk about most common seen surface treatment for electric resistance welded steel pipe.     First comes fusion bond epoxy, also known as FBE coating, which is widely used to protect steel pipe used in pipeline construction from corrosion. Working temperature for FBE coated steel pipe can up from 180℃ to 250℃.     Then comes varnish coating. Varnish coating is the most general surface treatment for steel pipe. General varnish coating is just an oil-liked coating on pipe surface and have strong anti-corrosion effect. For industrial steel pipes, varnish steel pipes is needed.     Another surface treatment for ERW steel pipe is PE. Both PE and 3PE is common seen ways. PE coated steel pipe is widely used for liqu...

    Seamless elbow is manufactured by the seamless steel pipe, through hot push, press or extrusion processes, no seam on the elbow body. Welded elbow is manufactured by welded steel pipe, same processes with seamless elbow.But there is a seam on the elbow body.     How to make seamless elbow     The production of seamless elbow mainly adopts the hot push technology. Hot push elbow forming technology is to use special elbow push system core machine, mold and heating device, to set on the mould of billet in pushing forward movement, under the impetus of the machine in motion is heated and hole enlargement and forming process. Hot push elbow deformation characteristics are based on volume before and after plastic deformation rule of metal materials determine the pipe diameter, pipe diameter elbow diameter, through the core module and control the deformation of the process, make the inner arc compressed metal flow, the compensation to other parts of the th...

    Socket Weld (SW) fittings are defined in the ASME B16.11. As with socket weld, a pipe is inserted into a recessed area of the fitting. Both the pipe and the fitting are square cut, with no need for beveled end or preparation other than cleaning the outside, which allows easy welding and installation.     Butt weld (BW) fittings are defined in the ASME B16.9. They are welded at their ends to pipe end, with the same thickness as pipes. The end of butt weld fittings shall be beveled.     Application     Socket weld (the fillet weld) resists around 1/2 the strength of butt welding. So it is mainly used for small pipeline (Small Bore Piping) with diameters NPS 2 or smaller.     Butt weld keeps better strength, good for high pressure or high temperature pipelines. So it is used when a welded joint with strength not lower than that of the base metal itself is needed.     Feature     Socket weld is easy to ins...

    Carbon steel can be divided into 10# 20# A3 Q235A 20g Q345B 20g 16Mn ASTM A234 ASTM A234 ASTM A403 et, and the elbow part made of these materials can be called carbon steel elbow.     According to the angle: 45°, 90°, 180°, these three commonly used elbows, and other engineering needs, can be specially customized such as 60 ° or other angles.     Connection with carbon steel pipe : welding, flange connection, screw connection, socket connection and other forms.     According to the process form can be divided: welding elbows, stamping elbows, casting elbows and so on.     Uses: Connect two tubes to change the direction of the tube, turning to 45° or 180° and 90° or other angles.     Manufacturing standards: national standard, American standard, Japanese standard, German standard, and Russian standard.     The basic process of a carbon steel elbow is to first weld a multi-prism ring shell with a polygon...

    What are the possible causes of stress concentration in welded joints?     a. Process defects in the weld, such as pores, slag inclusions, cracks, and incomplete penetration, where the stress concentration caused by cracks and incomplete penetration is severe.     b. Unreasonable weld seams, such as butt weld seams that are thicker and oversized, can create significant stress concentrations.     c. Unreasonable design of welded joints, such as abrupt changes in the cross section of the joints, butt joints with cover plates, etc., can cause serious stress concentrations. Improper welds may also cause stress concentration.     What are the adverse effects of stress concentration on the welded structure? how to improve?     1. Excessive stress may even cause cracks in the solder joints, causing potential safety hazards.     2. Deformation of components, such as the rack of some equipment, will be processe...

    How many kinds of welded steel pipe are there?     1, LSAW pipe features: welding under static conditions, high weld quality, short welds, the probability is very small defects. By expanding full-length steel tubular good, precise size, wide range of pipe wall thickness and diameter range, the diameter range up 406-1829mm, wall thickness range up 6.0-60mm, high degree of automation, Compared to seamless steel, it is lower production costs, for buildings, bridges, dams, offshore platforms and other steel bearing with columns, large span structures as well as wind and seismic requirements for electrical tower mast structure.     2, High frequency welded steel pipe features: tubular good, uniform thickness, internal and external burrs produced by the welding tool calibrating the appropriate online through strict control of non-destructive testing of weld quality, high degree of automation, low production costs. But relatively thin wall thickness, diame...

    The pressure welded steel pipe consists of pipe, pipe fittings which include elbow, tee joint, taper pipe and other fittings, valve, flanged joint (flange, spacer as well as bolts), and these composition pieces are generally standard components, which can be fully decided by several factors such as their nominal pressure, texture of material, nominal diameter as well as wall thickness of the Welded steel pipe. And the nominal pressure of all the piping components in the same pipeline pressure grade. Thus, the nominal pressure grade of the piping components are called pipeline pressure grade in engineering.     The pipeline material grade is the piping components selecting and using regulations established by the designing institute or the engineering companies. And it is always given in the form of the excel sheet. In addition, the engineering and technical staff can make sure the detail specific provision of all kinds of dimensions and specifications of the pi...

    Steel pipes are ubiquitous and can be found in underground, residential, laboratory, commercial and industrial buildings.The pipes transport fluids including water, natural gas, waste and air. Three manufacturing methods exist to produce steel pipes. Seamless steel pipes are produced using an extrusion mold. Welded steel pipes are produced by rolling a sheet of steel into a tube and welding the seam.     The seamless steel pipe manufacturing process starts with a solid, round steel billet. This billet is then heated to great temperatures and stretched and pulled over a form until it takes the shape of a hollow tube. Here we will introduce the strength under loads of seamless steel pipe.     Seamless steel pipe can sometimes be more expensive than other forms of steel pipe, but it’s also more reliable.     This is because it has greater strength under loading. Empty pipe must always support its own weight, but when a pipe is filled with m...

    Cooling method plays an important role during the production process of seamless steel pipe. As some defects may happen during the cooling process if we don’t take the rightful plans for it. So we should have a clear understanding for the cooling methods before the production of steel pipe.     There are three main categories for cooling method:     1. Fast cooling: this is the cooling method with the process of blowing, spraying and water. We can use fast cooling if we are in need of fast done for the product. Depend on the cold water, we can lower the temperature quickly than air cooling method.     2. Air cooling: according to the literal meaning, we can know the method easily. It is a kind of natural cooling method as we just need to put the steel pipe into the air. To some extent, it is a widely used way to cool steel pipe after hot rolling.     3. Slow cooling: this kind of cooling method is characterized by hot-rolled ...

    The delivery condition of seamless steel tube is the final plastic deformation or final heat treatment state of the finished product.Hot rolled or cold drawn (rolled) state or manufacturing state, generally not by heat treatment;Heat treatment after heat treatment, or normalizing, tempering, solid solution, annealing, according to the type of heat treatment state.     The state of delivery of the seamless steel tube is usually the state of annealing or the original state of the steel, which facilitates subsequent processing. When ordering, the delivery status must be stated in the contract. Weight delivery status:     Actual weight - at the time of delivery, the weight of its product is delivered according to the weighing (weighing) weight;     Theoretical weight - The weight of the product at the time of delivery is based on the nominal weight of the steel.     http://www.xysteelpipe.com/info/Seamless-steel-pipe-delivery-con...

    Comparing to other steel grades, casing pipes of grades J55, K55 are a popular choice for wells without stringent anti-corrosion or strength requirements. Here, we will introduce you the difference between K55 and J55.     Chemical composition and physical properties     API grade K55 has the same Chemical composition as grade J55, both of them has the same yield, but its minimum tensile strength is about 26% higher compared to J55.     J55     Yield strength: 379-552 MPa (55-80 ksi),     Minimum tensile strength: 517 MPa (75 ksi)     K55     Yield strength: 379-552 MPa (55-80 ksi),     Minimum tensile strength: 665 MPa (95 ksi)     Heat treatment (PSL2 and PSL1 are different)     API 5CT J55 PSL1 and API 5CT K55 PSL2 is the same (Rolling delivery);     PSL2 :J55 and K55 should be normalized or normalized and tempered. If thickened, normalizin...

    A pipe end is the description of how the section of pipe ends. Understanding the end of pipe is important when designing a piping system since it would be inappropriate for the designer to specify a threaded connection for a large diameter pipe or to specify a welded end when connecting to a threaded component.     Typically used on pipe 3" and smaller, threaded connections are referred to as screwed pipe. With tapered grooves cut into the ends of a run of pipe, screwed pipe and screwed fittings can easily be assembled without welding or other permanent means of attachment. In the United States, the standard pipe thread is National Pipe Thread (NPT). The reason for this is that as NPT connections are assembled, they become increasingly more difficult for the process to leak. The standard taper for NPT pipe is 3/4" for every foot.     Threaded fittings have threads that are either male or female. Male threads are cut into the outside of a pipe or fit...

    In long distance conveyance of crude oil, natural gas or refined oil, the pipeline usually need to be buried underground. When steel pipes or pipe fittings are in contact with soil and waters, we must consider its external anti-corrosion performance to ensure a durable lifespan of the pipeline.     The three layers Polyethylene(3PE/3LPE) external coating perfectly solves this problem. It consists of a high performance fusion bonded epoxy(FBE) layer, an adhesive layer and an outer layer of high density polyethylene. The three layers external coating has excellent resistance to abrasion, wear, acid, alkali and cathodic disbonding, etc.     3LPE coated pipes consist of 3layers for pipeline coating.     Layer 1(FBE>100um consists of fusion bonded epoxy. This layer protection against corrosion and is fusion with the blasted steel surface.     Layer 2 (170～250um) is copolymer adhesive which has excellent chemical bonding to the ...

    Oil pipeline 3PE anti-corrosion steel pipe advantages:     1, long service life Polyethylene pipe has the highest molecular weight, with good stability and anti-aging properties, under normal operating temperature and pressure conditions, the service life can be guaranteed for more than 50 years.     2, corrosion resistance Polyethylene molecular structure of high stability, resistance to natural gas, liquefied petroleum gas, artificial gas and other chemical corrosion, without secondary corrosion protection equipment. The chemicals present in the soil do not cause any degradation of the tubing.     3, with excellent impact resistance, seismic resistance Polyethylene low temperature embrittlement temperature is very low, can be -60 ℃ ~ 60 ℃ temperature range of safe use, uneven subsidence of the pipe base has a very strong adaptability. Winter construction, due to the material impact resistance, will not happen brittle pipe.   ...