SSAW Pipe

 OCTG is a kind of high-level product made of steel pipes, and it has many kinds. For OCTG’s diameter, there are 15 kinds. For OCTG’s steel grade, there are 11 kinds, such as J55, K55, etc. For it’s pipe end treatment, there are also many kinds, such as VAM, TOP VAM, LC, BC, STC, etc. As OCTG is quite a delicate steel pipe, so how much do you know about the testing method s of OCTG? 1. Eddy Current Testing Eddy current testing mainly uses the eddies in the work piece produced by magnet coils to analyze the internal qualities of the work pieces, and to detect the surface and near surface defects of various kinds of conductive materials. 2. Ultrasonic Testing When ultrasonic waves propagate in the tested material, acoustic characteristics of the material and changes of internal structures have a certain influence on the propagation of ultrasonic waves. We can know the changes of material's performance and structure by the influence degree and condition of the ultrasonic waves. 3. Pen...

 Both anti-corrosion pipes and insulation pipes have strong antiseptic properties, but do you know the differences between anti-corrosion pipes and insulation pipes? Today, we’ll talk about this topic. Spiral welded steel pipe, straight seam welded steel pipe, ERW steel pipe, Seamless steel pipe can used as anti-corrosion steel pipes. We can cover steel pipes with all kinds of coating, such as FBE, 3PE, Epoxy, etc. So that we can avoid the soil, wet air condition and medium (such as oil, natural gas, etc.) material for pipe corrosion, which can improve the service life of steel pipe and make more safety in pipeline construction. Insulation pipe is generally use ordinary spiral steel pipe, straight seam steel pipe, seamless steel pipe heat preservation material on its surface figure, which mainly used in heating or cooling pipeline construction. Pipe Corrosion Corrosion is the gradual deterioration of a substance by its surroundings. Different metal to metal connection, debris, oxyg...

 During the rolling process of seamless steel pipes, due to the influence of the stability of the machine and peripheral equipment and the uncertainty factors in the production process, the product dimensions often exceed the tolerance range specified in the product standard. The situations are as follows: 1. Uneven wall thickness 1)Features: The wall thickness of the steel pipe is uneven on the same section, and the difference between the maximum wall thickness and the minimum wall thickness is large. 2)Reason: The uneven wall thickness of the pipe material is too large, and the drawing line is inconsistent with the axis of the steel pipe during drawing. The plug is worn or the back hole of the plug is eccentric. Correction of the centering hole of the tube blank. The curvature and cut slope of the tube blank are too large. 3)Prevention: In order to reduce the uneven wall thickness of the steel pipe, the uneven wall thickness of the pipe material should be as small as possible, an...

 UT, which is short for Ultrasonic Test, is widely used for tasting 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? 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 quickly find out the exact position on the steel pipe, providing accurate and dependable testing result. Testing result can show immediatel...

 1. Grinding of thick-walled seamless nozzle: After cutting, use an angle grinder to grind the plastic layer of the nozzle. Its purpose is to prevent the plastic layer from melting or even burning during the flange welding process, damaging the pipe, and grinding the nozzle plastic layer with an angle grinder. 2. Thick-walled seamless pipe plastic coating treatment:After polishing, oxygen is used. C2H2 heats the nozzle outside the pipe to the inner plastic layer. The technician will then apply the prepared plastic powder evenly to the spout.It should be noted that it must be applied in place. The coating of the flange plate should be applied above the water stop line.During this process, the heating temperature should be strictly controlled. If the temperature is too high, air bubbles will be generated during the coating process. If the temperature is too low, the plastic powder will not melt completely during the coating process. In the above case, the plastic layer will fall off ...

 Tubing is a certain kind of steel pipes for oil and gas transmission purpose. Seamless steel pipe can be used to forming tubing. Today, we’ll talk about API 5CT tubing. Outer Diameter for API 5CT Tubing is from 42.16mm to 114.3mm. Wall thickness is from 3.18mm to 16mm. Range length generally has 3 items, Range 1(R1), Range 2(R2), Range 3(R3). R1 is from 4.88m to 7.62m, R2 is from 7.62m to 10.36m, R3 is from 10.36m to 14.63m. Steel grade of API 5CT includes H40 tubing, J55 tubing, K55 tubing, L80 tubing, R95 tubing, N80-1/Q tubing, C90 tubing, T95 tubing, P110 tuing. We all know that generally speaking, we have a certain formula to culculate theoretical weight of pipes, but for tubing, as there is special treatment for pipe end, such as thresded or coupled pipe end, this will cause the difference between general formula result weight and actual tubing weight. Pipe end for API 5CT Tubing includes integral joint, non-upset threaded and coupled(NU T&C), external upset threaded and...

 Inward folding is a common quality problem in the production of seamless steel pipes. It is the irregularly distributed sheet-like folds and spiral-like folds on the inner surface of the steel pipe, and the edges of the defects are mostly serrated. There are two main reasons for the internal folding defects: the quality of the continuous casting tube blank (internal cause) and the perforation process system (external cause). In addition, improper operation will also lead to inward folding of the steel pipe. The main forms of inward folding in operation are mesh, point, sheet, and spiral. Regular helical defects are generally caused by severe wear of the plug or mandrel defects. In addition to the regular distribution of such defects, the edges of the defects are more tidy than the steel defects. Irregular mesh, point, flake and other internal folding defects are generally caused by the following reasons. 1)The amount of depression before the top is too large, which causes the tube...