As indicated by the assembling strategy, the steel line can be separated into two classes: consistent steel pipe and welded crease steel pipe. Among them, ERW steel pipe is the primary assortment of welded steel pipe. Today, we fundamentally discuss two sorts of steel pipes utilized as unrefined substances for petrol Packaging pipe: Consistent packaging and ERW packaging.
Consistent packaging – Packaging made of consistent steel pipe as natural substance;
Consistent steel tubes allude to steel tubes fabricated by four techniques: hot rolling, cold rolling, hot drawing, and cold drawing. There are no welds on the line body itself.
ERW packaging – Packaging made of electric welded pipe as unrefined substance
ERW (Electric Safe Weld) steel pipe alludes to a straight crease welded pipe produced through a high-recurrence obstruction welding process. The natural substance steel plate (loop) of ERW welded pipe is made of low-carbon microalloy steel moved by TMCP (Thermo-Mechanical Control Interaction).
External measurement resilience
Consistent steel pipe: Hot-rolled framing process is utilized, and the measuring is finished at around 8000C. The unrefined substance organization, cooling condition and cooling condition of the roller impact its external distance across, so the external measurement control is hard to be precise and changes The reach is bigger.
ERW steel pipe: embraces cold-framed shaping and estimating by 0.6% decrease. The interaction temperature is fundamentally consistent at room temperature, so the external distance across control is precise and the change range is little, which is useful to take out dark cowhide clasps;
Wall thickness resilience
Consistent steel pipe: It is delivered by round steel hole, and the wall thickness deviation is huge. The resulting hot rolling can to some degree kill the lopsidedness of the wall thickness, however the most developed unit must be controlled inside ±5~10%t.
ERW steel pipe: involving hot-moved loop as unrefined substance, the thickness resilience of present day hot-rolling can be controlled inside 0.05mm.
Appearance
The external surface imperfections of the spaces utilized in consistent steel pipes can’t be wiped out by the hot moving cycle, and the deformities must be finished after the completed item is done; the winding way left after hole must be to some extent dispensed with in the wall decrease process.
ERW steel pipe involves hot-moved curls as unrefined substances. The surface nature of the loops is the surface nature of ERW steel pipes. The surface nature of hot-moved loops is not difficult to control and great. Thusly, the surface nature of ERW steel pipes is far superior to consistent steel pipes.
Ovality
Consistent steel pipe: hot-rolled framing process is taken on. The natural substance creation of the steel pipe, the cooling condition and the cooling condition of the roll affect its external measurement, so it is challenging to control the external breadth precisely and the change range is huge.
ERW steel pipe: takes on chilly bowing shaping, so the external breadth control is exact and the variance range is little.
Elastic test
The elastic presentation records of consistent steel pipes and ERW steel pipes adjust to Programming interface guidelines, however the strength of consistent steel pipes is by and large at as far as possible and the pliancy is at as far as possible. In correlation, the strength record of ERW steel pipes is in the best state, and the pliancy list is 33.3% higher than the norm. The explanation is that the exhibition of hot-moved loops, the unrefined substance of ERW steel pipes, is ensured through microalloying purifying, out-of-heater refining, and controlled cold and controlled rolling; consistent steel pipes for the most part depend on means to increment carbon content, which is hard to guarantee strength and versatility. Sensible match.
Hardness
The unrefined substance of ERW steel pipe, hot-moved loop, has incredibly high accuracy during the moving system, which can guarantee the uniform exhibition of all pieces of the curl.
Grain size
The natural substance of ERW steel pipe-hot-moved loops are made of wide and thick ceaseless projecting billets, with a thicker fine-grained surface hardening layer, no columnar precious stone locales, shrinkage and porosity, little sythesis deviation, and minimal construction; in the resulting moving cycle The use of controlled cold and controlled moving innovation further guarantees the grain size of unrefined components.
Hostile to fall test
ERW steel pipe is because of the qualities of its unrefined substances and line making process. Its wall thickness consistency and ellipticity are infinitely better to consistent steel pipes, which is the primary motivation behind why the breakdown obstruction execution is higher than that of consistent steel pipes.
Influence test
Since the effect sturdiness of the base material of ERW steel pipe is a few times that of consistent steel pipe, the effect strength of the weld is the way to ERW steel pipe. By controlling the pollutant content of natural substances, the level and bearing of cutting burrs, the state of shaping edges, the welding point, and the welding speed , Warming power and recurrence, welding expulsion volume, halfway recurrence withdrawal temperature and profundity, air cooling segment length and other interaction boundaries guarantee that the effect energy of the weld arrives at over 60% of the base metal. Assuming that further advanced, the weld influence energy can be near the base Material to accomplish consistent execution.
Impacting test
The impacting test execution of ERW steel pipe is a lot higher than the standard prerequisite, basically because of the great consistency of wall thickness and uniform external measurement of ERW steel pipe.
11.Straightness
The consistent steel pipe is shaped in a plastic state, and the straightness of the line end is somewhat challenging to control with the single ruler (3 to multiple times ruler for constant rolling);
ERW steel pipe is cold-worked, and it has web based fixing in the condition of diminishing distance across. Furthermore, it is boundless times, so the straightness is better.
12.The utilization of steel for 10,000-meter film packaging
The wall thickness of ERW steel pipe is uniform, and its wall thickness resilience can be disregarded. The control precision cutoff of consistent steel pipe wall thickness contrast is ±5%t, and it is for the most part controlled at ±5-10%t. To guarantee that the base wall thickness can fulfill the guideline necessities and execution, the arrangement must be tackled by suitably expanding the wall thickness. In this manner, in the packaging of a similar particular and a similar weight, the ERW steel pipe is 5-10% longer than the consistent steel line, or significantly more, which decreases the steel utilization of the packaging for 10,000 meters by 5-10%. Indeed, even at a similar value, ERW packaging basically saves clients 5-10% of buying costs.
To summarize:
Taking everything into account, it is more consistent to utilize. Since ERW’s ongoing packaging steel grade must be controlled at the most elevated K55, assuming that the steel grade is higher, China doesn’t have this creation limit. Taking everything into account, Japanese creation gear and creation are as yet utilized for packaging. The cycle can arrive at a specific level, however it must be created to N80. To deliver steel grades of P110 or higher, it is at present troublesome, so ERW must be utilized for surface packaging.
Tips: ERW welded pipe is framed by moving strip and welding the crease, with more tight layered resiliences and less weight. The weld crease is heat treated subsequent to welding that no untempered martensite remains, and the weld blaze can be eliminated from both internal and external surfaces.
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