As indicated by the assembling technique, the steel line can be isolated into two classifications: consistent steel pipe and welded crease steel pipe. Among them, ERW steel pipe is the principal assortment of welded steel pipe. Today, we fundamentally discuss two sorts of steel pipes utilized as natural 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 made 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 unrefined substance steel plate (curl) of ERW welded pipe is made of low-carbon microalloy steel moved by TMCP (Thermo-Mechanical Control Cycle).
External distance across 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 measurement, so the external breadth control is challenging to be precise and varies The reach is bigger.
ERW steel pipe: embraces cold-shaped framing and measuring by 0.6% decrease. The cycle temperature is fundamentally steady at room temperature, so the external breadth control is precise and the vacillation range is little, which is useful to take out dark calfskin clasps;
Wall thickness resilience
Consistent steel pipe: It is delivered by round steel hole, and the wall thickness deviation is enormous. The resulting hot rolling can somewhat dispose of the lopsidedness of the wall thickness, however the most exceptional unit must be controlled inside ±5~10%t.
ERW steel pipe: involving hot-moved curl as unrefined substance, the thickness resilience of current hot-rolling can be controlled inside 0.05mm.
Appearance
The external surface deformities of the spaces utilized in consistent steel pipes can’t be dispensed with by the hot moving cycle, and the imperfections must be finished after the completed item is done; the winding way left after hole must be to some extent disposed of in the wall decrease process.
ERW steel pipe involves hot-moved curls as natural 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. In this way, 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 impact its external breadth, so it is hard to control the external measurement precisely and the variance range is huge.
ERW steel pipe: takes on cool twisting shaping, so the external breadth control is exact and the variance range is little.
Malleable test
The malleable presentation records of consistent steel pipes and ERW steel pipes adjust to Programming interface norms, yet the strength of consistent steel pipes is by and large at as far as possible and the versatility is at as far as possible. In correlation, the strength file of ERW steel pipes is in the best state, and the pliancy record is 33.3% higher than the norm. The explanation is that the presentation of hot-moved loops, the natural substance of ERW steel pipes, is ensured through microalloying purifying, out-of-heater refining, and controlled cold and controlled rolling; consistent steel pipes basically depend on means to increment carbon content, which is hard to guarantee strength and versatility. Sensible match.
Hardness
The natural substance of ERW steel pipe, hot-moved curl, has incredibly high accuracy during the moving system, which can guarantee the uniform exhibition of all pieces of the loop.
Grain size
The unrefined substance of ERW steel pipe-hot-moved loops are made of wide and thick ceaseless projecting billets, with a thicker fine-grained surface cementing layer, no columnar precious stone districts, shrinkage and porosity, little sythesis deviation, and minimized structure; in the resulting moving cycle The utilization of controlled cold and controlled moving innovation further guarantees the grain size of natural substances.
Against breakdown test
ERW steel pipe is because of the attributes of its natural substances and line making process. Its wall thickness consistency and ellipticity are infinitely better to consistent steel pipes, which is the fundamental motivation behind why the breakdown opposition execution is higher than that of consistent steel pipes.
Influence test
Since the effect strength of the base material of ERW steel pipe is a few times that of consistent steel pipe, the effect durability of the weld is the way to ERW steel pipe. By controlling the pollutant content of unrefined components, 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, moderate recurrence withdrawal temperature and profundity, air cooling area length and other cycle boundaries guarantee that the effect energy of the weld arrives at over 60% of the base metal. In the event 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 necessity, principally because of the great consistency of wall thickness and uniform external width of ERW steel pipe.
11.Straightness
The consistent steel pipe is shaped in a plastic state, and the straightness of the line end is generally hard to control with the single ruler (3 to multiple times ruler for nonstop rolling);
ERW steel pipe is cold-worked, and it has web based fixing in the condition of diminishing distance across. What’s more, 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 resistance can be disregarded. The control precision cutoff of consistent steel pipe wall thickness contrast is ±5%t, and it is by and large controlled at ±5-10%t. To guarantee that the base wall thickness can satisfy the guideline prerequisites and execution, the arrangement must be addressed by suitably expanding the wall thickness. In this manner, in the packaging of a similar determination and a similar weight, the ERW steel pipe is 5-10% longer than the consistent steel line, or much more, which diminishes the steel utilization of the packaging for 10,000 meters by 5-10%. Indeed, even at a similar value, ERW packaging practically saves clients 5-10% of buying costs.
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