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The tensile properties of seamless steel pipes

1.Outer Diameter Tolerance

ERW steel pipe: Cold-formed and sizing by reducing the diameter by 0.6%. The outer diameter is controlled accurately and the fluctuation range is small, which is helpful to eliminate black leather buckles.

Seamless steel pipe: Hot-rolling forming process and sizing completed at about 8000C. The raw material composition, cooling conditions, and cooling conditions of the rolls of the steel pipe have a large impact on outer diameter, so it is difficult to control the outer diameter accurately and fluctuate. 

 

2.Wall Thickness Tolerance

ERW steel pipe: using hot-rolled strip as the raw material, the thickness tolerance of modern hot-rolled strips can be controlled within 0.05mm, and Aluminum Flue Pipes Suppliers seamless steel pipes are produced by round steel perforation, with large wall thickness deviations. The subsequent hot rolling can partially eliminate the wall thickness. Thickness non-uniformity, but currently the most advanced units can only be controlled within ± 5 to 10% t, corresponding to steel tubes with a thickness of 8.94mm.

Seamless steel tube: The limit of the wall thickness control accuracy is 0.9mm.

3.Tensile Test

The tensile properties of seamless steel pipes and ERW steel pipes are meet API standards, but the strength of seamless steel pipes are at the upper limit and the plasticity are at the lower limit. In comparison, the plasticity index of ERW steel pipes is 33.3% higher than the standard. Because the raw material of ERW steel pipe—hot-rolled coils is ensured by means of microalloying smelting, refining outside the furnace, and controlled cold and controlled rolling; seamless steel pipes mainly rely on means of increasing carbon content, and it is difficult to ensure strength and plasticity.

 

4. Anti-crush Test

Because of raw materials and pipe manufacturing process of ERW steel pipe. Its wall thickness uniformity and ovality are far superior to seamless steel pipes, which makes it the crush resistance higher than seamless steel pipes.

 

5.The Amount of Steel Pipe Used for the 10,000-meter

The wall thickness of the ERW steel pipe is uniform, and its wall thickness tolerance is negligible. The control accuracy limit of the difference in wall thickness of the seamless steel pipe is ± 5% t, and generally controlled within ± 5 ~ 10% t. In order to ensure that its minimum wall thickness can meet the standard requirements and use performance, it can only be solved by appropriately increasing the wall thickness. Therefore, with the same specifications and the same weight of casing, ERW steel pipe is 5-10% longer or even more than the seamless steel pipe, which reduces the amount of steel used for 10,000 meters of casing steel 5-10%. Even at the same price, ERW bushings virtually save users 5 to 10% of their purchase costs.

Large-diameter welded steel pipe is the pipe welds,

Large-diameter welded steel pipe is the pipe welds, raw materials are mainly steel sheet and strip, large diameter straight seam welded steel pipe is used, the higher productivity of the kinds of steel, more used in more low-cost steel products one. stainless steel chimney liner Large diameter spiral welded steel pipe is used, compared to the straight pipe joints, mechanical strength of the products is relatively high, to save raw materials, but the production is slow. The product is widely used in water engineering, petrochemical industry, chemical industry, power industry, agricultural irrigation, urban construction, is one of the products of 's 20 key development. For the transport of liquids: water supply, drainage. For gas transportation: gas, steam, LPG. For structural purposes: as piling pipe for bridges; piers, roads, pipes and other building structures.
In the large-diameter steel pipe welding process, the most commonly used is welded steel pipe, which is mainly used for oil drilling and machinery manufacturing stove pipe can be used as water-gas pipe, large diameter welded pipe for high pressure gas transmission, etc.; spiral welded pipe for oil and gas, piles, piers, etc. seamless steel pipe and welded steel pipe is lower than cost, high production efficiency. Longitudinal simple production technology, high production efficiency, low cost, rapid development. spiral strength than the straight seam welded pipe is generally pipe, can narrow the billet production of large diameter pipe, you can use the same width of the billet production of different pipe diameters, but with a straight seam pipe compared to the same length, the weld length of 30 to 100%. and lower production rate, so the smaller diameter pipe is mostly a straight seam welded, large diameter spiral welded pipe is mostly used.
According to different methods can be divided into arc welding pipe, high or low frequency electric resistance welded pipe, gas pipe, stove pipe, Bundy tubes. According weld shape can be divided longitudinally and spirally welded pipe welded steel refers to steel or steel bending round, square, etc. and then welded into shape, the surface of the steel pipe seams welded steel pipe production process simple, high production efficiency, variety specifications, less capital equipment, but generally lower than the intensity of seamless steel tubes. since the 1930s, along with the rapid development of high-quality steel rolling production, and improve the welding and inspection technology, continuous improvement of weld quality, welded steel pipe increasing number of varieties and specifications, and in more and more areas instead of seamless pipe.

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Metal flow lines of the weld


By boilerflue, 2020-10-14
Metal flow lines of the weld

Through this process of production of steel pipe weld fusion center will appear as a white line on both sides of the heat affected zone will produce fusion line extending from the middle toward the surface and the inner and outer metal flow lines. Since ERW steel pipe is used as the base material Ningbo Taiyue Hardware Co.,Ltd. using welding materials, so its properties of the weld and base metal properties have a greater relationship. Figure 1 is a common material with high toughness material, weld and base metal ductile-brittle transition temperature curve. In ordinary materials, Charpy impact test weld and base metal absorbs very little difference in the energy value. In contrast there are large differences between high toughness material, weld toughness significantly inferior to the base metal, but much better than ordinary weld material. ERW welded steel pipe weld toughness can be seen in the general case is below the center of the base metal toughness, even with high toughness materials, although the toughness of the weld is improved, but not a radical improvement in the impact toughness of weld center. 
Impact properties affected by changes in the chemical composition, the use of two different chemical composition of the material were made after Charpy impact test pipe. In order to exclude the impact of process pipe on the test results, all samples were carried normalizing. ERW steel pipe welding process, due to the mechanical pressing action, in both sides of the weld heat affected zone generated by the extension of the surface direction of the central inner and outer sheet metal flow line, the direction of the metal flow lines substantially near the center of the weld fusion line parallel to and coincident with the fusion line. Metal flow lines are banded and inclusion of hot-rolled steel plate extending along the rolling direction, the thickness of the metal flow lines and raw grain size and the degree of non-metallic inclusions much about. The larger grain size of the raw materials or more non-metallic inclusions, the thicker the metal flow lines more obvious. When the non-metallic inclusions and showed a more uneven distribution, the base metal segregation serious. When high-frequency welding, the pressing force in the action of the squeeze roll, a large number of non-metallic inclusions in the segregation band will enter the metal flow along the welding line to the fusion zone, the hot acid from the sample may fold lower apparent segregation lines an angle at the intersection of the weld line. In this case, it will seriously reduce the impact toughness of the weld, so that the impact absorbed energy is greatly reduced. Therefore, in coils of raw materials smelting, rolling stage should take measures to reduce inclusions and grain refinement process in pipe flow lines should also rise angle metal reasonable control. 
Metal flow lines of the weld and heat affected zone can be eliminated by heat treatment method. Welding is under the same conditions, the impact of heat treatment and after heat treatment without the sample weld toughness two differences, two samples were taken, a heat treatment, the metal flow lines disappeared, another group without heat treatment, there is a significant flow of metal. One important factor is water-cooled heat treatment conditions on the starting temperature. Pipe weld heat after heat treatment, to go through a long distance air-cooled, air-cooled section in order to shorten the distance and prevent pipe deformation after sizing, sizing prior to entering the water-cooled steel pipe. If the water cooling initiation temperature is too high, bainite is generated, thereby reducing the impact toughness of the weld. As can be seen from the figure the water cooling initiation temperature should be controlled below 400 appropriate.            

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About boilerflue

Ningbo Taiyue Hardware Co.,Ltd.  is a production-oriented enterprise integrating r & d, design, manufacturing and sales, specialized in producing flue pipes for Flue for gas boiler gas boiler. Over the years, we have been absorbing the advanced production technology and production experience constantly, introducing advanced equipment, and now we have formed a production management system. It makes our products have better quality and more  competitive. Among them, EU style aluminum coaxial flue pipes are our characteristic product, won high reputation both at home and abroad.

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