Welding steel pipe slag is the residual slag in the weld. From the theoretical analysis, the main reason for submerged arc welding slag inclusion due to the following three reasons: 1 The raw materials (including the parent metal, wire, and flux) are more tolerable; 2 During the multi-layer welding, cleaning between layers; 3 Improper selection, welding process parameters are not conducive to the production of slag.

In the straight seam steel pipe production of straight seam steel pipe, manufacturers need to have good control of the pressure. This is why during the welding process, the edge temperatures of the two tube embryos reach the welding temperature, and the pressure can make them infiltrate the common metal particles, resulting in a tightly bound crystallization to achieve the purpose of welding firmly. However, if the lack of extrusion during the crystallization process is poor, the strength of the weld seam is very low, and cracks are prone to occur due to external problems during the process. But when the extrusion is too large, the welding temperature of the weld metal will be squeezed out of the weld seam position, R actually welding together can get the temperature and the metal will be very small, so the number of crystals will be reduced, which will also lead to welding Not strong, but there are many glitches, so it is a more serious flaw, so remind consumers to buy straight seam submerged arc welded steel pipe from the regular manufacturers, because they control the extrusion force is perfect.

Thick-walled steel pipe, its pipe diameter and wall thickness ratio of less than 20, said the steel pipe is a thick-walled steel pipe. Mainly used in petroleum geological drilling pipe, petrochemical cracking pipe, boiler tube, bearing pipe and high-precision structural control of automobiles, tractors, aviation and so on.

There are many factors affecting large-diameter high-quality double-sided submerged arc welded steel pipes (DSAW steel pipes). The key factors directly related to the formation of the mass diameter are: expansion rate, axial overlap, number of segments and fillets, friction and lubrication between the block and the inner wall of the steel pipe, shape error of the steel pipe, expansion speed and setting of the expander leveler .

Large-diameter straight seam steel pipe welding, including pre-welding, welding and welding three processes.

At present, the long-distance transportation of oil and natural gas mainly adopts pipeline. Long-distance pipeline pipeline used in the main spiral pipe submerged arc welded pipe(ssaw steel pipe) and double submerged arc welded straight steel pipe(Lsaw steel pipe). As the spiral submerged arc welded pipe is based on strip as raw material, wall thickness is limited, in addition to the existence of spiral submerged arc welded pipe longer, greater residual stress, weld reliability is poor and difficult to overcome the shortcomings of dense population area and reliability requirements of the region, large diameter straight seam submerged arc welded pipe has been gradually replaced by spiral submerged arc welded pipe.

The quality inspection standards and operating procedures for cold-drawn carbon seamless steel tubes are as follows: The characteristics of cold drawn tube production are from input to finished product, which is usually produced through some cold deformation work hardening, through a large number of preparatory processes and deformation process, so that the entire production process, with the characteristics of reciprocating cycle, and thus more processes, production The long cycle, metal consumption, low production efficiency, production scale are generally not large.

In order to guarantee the quality of the extruded polyethylene coating, the large-diameter steel pipe specified in this standard shall be welded to ≤ 2.5 mm, and the weld shall be smoothly transitioned.

According to different production methods of carbon seamless steel tubes, hot rolled tubes, cold rolled tubes, drawing tubes, and extruded tubes can be classified.

President of the Brazil iron and Steel Association, said Marco Polo Mello 22, Brazil still has time to persuade the United States formally exempted for steel and aluminum tariffs to the country's president temer Association called for telephone communication connection with us president Trump. The White House said in a 22 day statement that it will temporarily exempt from tariffs on steel and aluminum for EU, Argentina, Australia, Brazil, Canada, Mexico, Korea and other economies. In addition to economies in the exemption list, the United States announced earlier this month the steel aluminum tariffs on March 23rd onwards.

Tenaris offers oil and gas customers a wide range of profiles for high quality drill rods and tools. Our complete quotation includes operations requiring corrosion-resistant and high-strength steel grades.

Command Energy provides drill pipe in every weight, grade and size from 2-3/8” to 7-5/8”. Our drill pipe goes through vigorous quality checks to ensure each piece meets strict quality standards for superior durability and performance. Each piece of drill pipe is machined from a specific alloy that allows for exceptionally tight dimensional tolerances and enhanced performance.

The drill pipe is a tubular pipe made of steel and fitted with a special threaded end called a tool joint. A drill bit mounted drill bit can be operatively coupled with a drill bit surface apparatus or a combination of a drill bit and a bottom hole drill to pump drilling fluid onto the drill bit. Piping also helps to connect rig surface equipment for lifting, rotating, and lowering downhole drill bits and fittings. The rig is a hollow and thick-walled pipe, made of steel, for a variety of uses.

ASTM A672 standard specification for electric fusion welded steel pipe for high pressure service at moderate temperatures. This specification covers electrical-fusion-welded steel pipe for high-pressure service at moderate temperatures. Heat treatment may or may not be required to attain the desired properties or to comply with applicable code requirements. An analysis of each mill heat of plate material shall be made, also, an analysis of the finished deposited weld material from each 500 ft or fraction thereof shall be made. The mechanical test requirements includes one tension test specimen to represent each lot of finished pipe, and one transverse-guided-weld-bend test (two specimens) to represent each lot of finished pipe. Also, radiographic examination shall be made on the full length of each weld.

Straight seam welded pipe(lsaw steel pipe), Double-sided submerged arc welding steel pipe(dsaw steel pipe), longitudinal submerged arc welded steel pipe, high frequency straight seam welded pipe

The US standard carbon seamless steel tube is tested for mechanical properties. The mechanical properties of the test method are divided into two categories, one is a tensile test and the other is a hardness test.

(1) Carbon steel seamless pipes should be carefully installed and carefully inspected to ensure the quality of pipes and pipes.

Straight seam steel pipe is the production of steel plate, and spiral welded pipe is hot-rolled coil production. The rolling process of the hot strip mill has a series of advantages, and has the ability to obtain the metallurgical technology of producing high quality pipeline steel.

Magnetic particle testing or penetrant penetration testing can effectively detect surface defects such as surface cracks, folds, heavy skins, hairline, and pinholes. For ferromagnetic materials, magnetic particle inspection methods should be given priority because of their high detection sensitivity; for non-ferromagnetic materials, such as stainless steel seamless tubes, permeation testing is used.

Cold-drawn pipe wall defects High-precision cold-drawn tube inner surface roughness Ra ≤ 0.8μm, precision can reach diameter size ~ H9 H10, only to ensure that the honed H7 ~ H8 hole size and RA ≤ 0.2μm internal surface roughness requirements. In addition to the precision of the honing machine, the surface quality of the cold drawn tube is another key point. The internal surface defects of the cold drawn tube are classified by actual measurement data from a domestic manufacturer. There are mainly three types of honing tube surface roughness.

Hydrostatic pressure test, widely used in daily use, hydrostatic test, small valves, pressure vessels, various metal and non-metallic pipe pressure and burst test; various oil tools hydraulic strength and sealing performance test; pressure test and calibration pressure Instrumentation; pressure and burst tests of fire-fighting equipment such as fire hoses and fire extinguishers.