Attributes and Leads to of 8 Defects of Seamless Steel PipeIf there are some defects in the seamless steel pipe, it will undoubtedly have a fatal impact on the top quality of our items. So how to steer clear of these defects? Then you need to have to comprehend the causes for these defects. Permanent Steel Manufacturing Co.,Ltd will operate with you to examine the specific motives for the 8 defects of seamless steel pipes:
1. Seamless steel pipe-folding
It is a linear or spiral, constant or discontinuous state that exists on the outer or inner surface of seamless steel pipe. The principal cause for the folding is poor high quality of the pipe material, folding itself, or inclusions, serious scratches and cracks on the surface, edges and corners in the grinding place, and folding after drawing. In buy to stay away from folding, the quality of the pipe materials should be enhanced and attention should be paid to inspection and grinding.
2. Seamless steel pipe-crack
Refers to the small cracks on the inner and outer surfaces of the seamless steel pipe that are distributed in a straight line or a spiral, with a depth of one mm or far more, steady and discontinuous. In accordance to the examination of Permanent Steel Manufacturing Co., Ltd, the lead to is: the sizzling-rolled tube blank has subcutaneous bubbles and subcutaneous inclusions, and there are cracks or deep pits on the steel pipe just before drawing. In the course of the scorching rolling or cold drawing processes Longitudinal scratches or scratches occurred for the duration of the operation. Stopping the formation of cracks also lies in improving the quality of the tube blank and strengthening the inspection and grinding of the tube material. At the same time, pitting, scratches and scratches must be averted throughout the cold drawing production procedure.
three. Seamless steel pipe-scratches
The characteristic of the defect is that there are longitudinally linear scratches of various lengths on the inner and outer surfaces of the seamless pipe. Most of them are groove-shaped, but they may possibly also be raised stripes. The major reason for the scratches (cutting) is: there are internal markings on the pipe material, which can't be eradicated in the course of drawing, the iron oxide film remains on the steel pipe and the mold sticks to the steel, and the strength and hardness of the mold are inadequate or uneven. Fragmentation and wear occur, the hammer head is defective, and the sharp edges and corners of the hammer head transition part harm the mold. In order to prevent scratches and scratches, the quality of every planning procedure before drawing need to be enhanced, and molds with large power and hardness and excellent smoothness ought to be utilised.
Get More four. Seamless steel pipe-pit
This is one of the most frequent surface defects of seamless pipes. Neighborhood depressions with distinct regions are distributed on the surface of the steel pipe. Some of them are periodic and some are irregular. The pits are caused by iron oxide scale or other hard filth pressed into the surface of the steel pipe for the duration of the drawing or straightening approach, or the peeling of the original peeling on the surface of the steel pipe. Shandong Jute Pipe Business pointed out that the measures to prevent pits are to very carefully examine the pipe materials and take away defects this kind of as warping, keep the perform internet site, resources and lubricants clean, and prevent oxide scale and grime from falling on the surface of the steel pipe.
When there are smooth or sharp spiral marks on the outer surface of the seamless steel pipe, the straightening machine must be checked. Due to the incorrect position and angle of the straightening roller, the steel pipe rubbed the shoulders on the edge of the straightening roller for the duration of straightening. There are worn grooves on the straightening roller, and both ends of the steel pipe could appear on the outer surface of the steel pipe. Pits.
5. Seamless steel pipe-pitted surface
It is characterized by little pits in the kind of pieces and dots on the surface of the steel pipe. The major cause for the pitting surface is pitting corrosion for the duration of pickling. After annealing, the oxide scale is also thick and straightened and pressed into the surface of the steel pipe to form a pitted surface the steel pipe is kept in a humid atmosphere, and even pitted rust takes place following water enters. After removing the rust spots Form pitted surface.
six. Seamless steel pipe-spots
Considering that seamless steel pipes are in get in touch with with water (or water vapor) in the course of processing or storage and are not handled in time (this kind of as drying), the traces left by water evaporation are named water spots, such as long speak to with water or corrosive water Rust spots are formed when the substance is Water spots usually have no depth, and rust spots usually corrode the surface of the steel pipe, and there will still be pitted surfaces after removal.
7. Seamless steel pipe-warped skin
It is characterized in that the inner and outer surfaces of the seamless steel pipe are partially separated from the metal substrate, and the person pieces are lumpy, discontinuous, rooted or not rooted on the pipe wall, but can't peel off naturally. The reasons are bad steel quality, the existence of subcutaneous bubbles, which are exposed soon after cold drawing the warping created for the duration of sizzling rolling is not eliminated on the tube billet to cold drawing the authentic deep and angular transverse pits on the steel tube After drawing, it forms a warped skin.
eight. Seamless steel pipe-scar
The inner and outer surfaces of the steel pipe have been not removed in time due to defects this kind of as folding and warping. In the subsequent processing, thin slices that could not be separated from the metal substrate were formed. Some of them have been lumpy, discontinuous, and rooted or not rooted on the pipe wall, but they could not peel off naturally. , Known as scarring. Surface defects need to be checked and removed in time to get rid of scars.
Tips: ASTM A53 Grade B is much more well-liked than other grades. These pipes can be bare pipes with no any coating, or it may be Sizzling-Dipped or Zinc-Coated and manufactured by Welding or by a Seamless manufacturing process. In Oil and Gasoline, A53 grade pipes are utilized in the structural and non-critical applications.
In the application of submarine oil and gasoline pipeline engineering, ERW welded pipes are risk-free and cost-effective.
|
Article Directory /
Arts, Business, Computers, Finance, Games, Health, Home, Internet, News, Other, Reference, Shopping, Society, Sports
|
