During the production of straight seam steel pipes there should be a strict control of the temperature so that the performance of the weld can be determined. If the temperature is too low, it may result in the welded position not reaching the temperature needed for welding, and it is difficult for the metal at both ends to penetrate each other and join together while most of the metal tissue is still solid. At that time when the temperature is too high, there is a lot of molten metal in the welding position, the texture of these parts is very soft, there is a corresponding fluidity, may be with the molten drops of the situation, when such a drop of metal is also not enough metal to interpenetrate. And in the time of welding there will be some uneven with the weld to form a melt hole. So integrated wastewater treatment equipment manufacturers reminded that the production process of straight seam welded pipe to the temperature change to have strict control. Regular manufacturers have very control technology, so the process of production can achieve the temperature control requirements to determine product quality, so we need to buy regular manufacturers of longitudinal welded pipe.
Longitudinal steel pipe will also have what classification.
1, galvanized welded steel pipe for low pressure fluid transmission (GB/T3091-13) also known as galvanized electric welded steel pipe, commonly known as white pipe. It is a hot-dip galvanized welded (furnace welded or electrically welded) steel pipe for the transmission of water, gas, air oil, heated steam, warm water and other general lower pressure fluids or other purposes. Steel pipe connection wall thickness is divided into ordinary galvanized steel pipe and thick galvanized steel pipe; connection end form is divided into non-threaded galvanized steel pipe and threaded galvanized steel pipe. The specification of steel pipe is expressed in nominal diameter (mm), which is an approximation of the inside diameter. Customarily expressed in inches, such as 11/2.
2, ordinary carbon steel wire casing (GB3640-88) is used in industrial and civil buildings and machinery and equipment installation and other electrical installation projects for the protection of steel pipes for electrical wiring.
3, straight seam steel pipe (YB242-63) is a steel pipe with welded seams parallel to the longitudinal direction of the pipe. Usually divided into metric welded steel pipe, welded thin-walled pipe, transformer cooling oil pipe, etc.
4, spiral submerged arc welded steel pipe for pressurized fluid transmission (SY5036-83) is made of hot rolled steel strip coil, spiral formed at regular temperature and welded by double-sided submerged arc welding. They are used for pressurized fluid transportation. Spiral seam steel pipe. The steel pipe has good pressure-bearing capacity and good welding performance. After various strict inspections and tests, they are stable in use. Steel pipe has large diameter and good conveying rate, which can save the investment of laying pipeline. It is mainly used for pipeline to transport oil and natural gas.
5、Spiral high-frequency welded steel pipe for pressurized fluid transmission (SY5038-83) is made of hot-rolled steel strip as pipe billet, spiral formed at room temperature and welded by high-frequency lap welding. It is used for pressurized fluid transportation. Spiral seam high frequency welded steel pipe. The steel pipe has good pressure-bearing capacity, good plasticity and easy welding and processing. After a variety of strict, inspection and test, the use of stable. This steel pipe has large diameter, good conveying rate, and can save the investment of laying pipeline. Mainly used for laying pipelines for the transmission of oil and gas.
6, general low-pressure fluid transmission with spiral seam high-frequency welded steel pipe (SY5039-83) is a hot-rolled steel strip as a pipe billet, often at high temperatures in a spiral shape, using high-frequency lap welding. It is used for general low-pressure fluid transportation. Seam high-frequency welded steel pipe.
7, spiral straight seam steel pipe for piling (SY5040-83) is made of hot rolled steel strip coil as billet, spiral formed at room temperature, using double-sided submerged arc welding or high-frequency welding. They are used for civil construction structures and docks. Steel pipes for foundation piles such as bridges.
Do you understand the surface treatment of straight seam steel pipe?
Nowadays straight seam steel pipe in our daily life is used more and more light, so do you understand the straight seam steel pipe surface treatment method everyone understands?
1, straight seam steel pipe cleaning using solvents and emulsions on the steel surface to remove oil, grease, dust, lubricants and similar useful substances, but can not remove the oxide skin, rust on the steel surface, flux, etc., can only be used as an auxiliary means of performance and stable production.
2, if the steel surface ground attached to the iron oxide scale, its rust removal effect is not ideal, can not reach the performance stability construction of the anchor particles deep requirements. Straight seam steel pipe descaling tools mainly use wire brush and other tools to polish the steel surface, manual descaling can reach SA2 grade, power tool descaling can reach SA3 grade, which can remove loose or raised oxide scale, rust, welding slag, etc.
3, pickling of straight seam steel pipe is generally treated by chemical and electrolytic methods, which can be used as reprocessing after sandblasting to remove rust. Although chemical cleaning can make the surface reach a definite degree of cleanliness and roughness, its anchoring particles are shallow and easy to cause pollution to the environment, and the pipeline performance is stable only with chemical pickling treatment, which can remove oxide scale, rust and old coating.